LMV321IST5X Equivalent & Substitute Parts

Part Overview

The LMV321IST5X is a general-purpose operational amplifier manufactured by MaxLinear, Inc., housed in a TSOT-5 (SOT-23-5 Thin) surface-mount package. This device features rail-to-rail output capability, making it suitable for low-voltage analog signal processing applications. The part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Slew Rate	1	V/µs
Gain Bandwidth Product	1	MHz
Current - Input Bias	1	nA
Voltage - Input Offset	1.7	mV
Current - Supply	130	µA
Current - Output / Channel	160	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	5.5	V
Operating Temperature	-40 to 85	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-5 Thin, TSOT-23-5	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LMV321IST5X is determined by the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: General Purpose
Number of Circuits: 1
Output Type: Rail-to-Rail (preferred for direct replacement)
Voltage Supply Range: Minimum 2.7 V, Maximum 5.5 V
Operating Temperature Range: -40°C to 85°C
Mounting Type: Surface Mount
Package Compatibility: SOT-23-5 or equivalent 5-pin surface-mount packages

Secondary Compatibility Parameters:

Slew Rate: 1 V/µs (baseline specification)
Gain Bandwidth Product: 1 MHz (baseline specification)
Current - Input Bias: 1 nA (baseline specification)
Voltage - Input Offset: 1.7 mV (baseline specification)
Current - Supply: 130 µA (baseline specification)

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (Rail-to-Rail Output): Parts maintaining rail-to-rail output specification with matching or superior electrical performance within the defined supply voltage and temperature ranges.

Category B - Functional Alternatives (Non-Rail-to-Rail): Parts with general-purpose amplifier functionality in compatible packages but with different output stage configurations or performance characteristics.

Parameter Comparison

Parameter	LMV321IST5X	LMV321SN3T1G	BD1321G-TR	BU7441G-TR	BU7461G-TR	LMV821M5X/NOPB	MAX4230AUK+T	MAX4291EUK+T	MAX4490AUK+T
Manufacturer	MaxLinear	onsemi	Rohm Semiconductor	Rohm Semiconductor	Rohm Semiconductor	National Semiconductor	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim	Analog Devices Inc./Maxim
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
Amplifier Type	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose	General Purpose
Number of Circuits	1	1	1	1	1	1	1	1	1
Output Type	Rail-to-Rail	Rail-to-Rail	—	—	—	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	1	1	1	0.3	1	2	10	0.2	10
Gain Bandwidth Product (MHz)	1	1	3	0.6	1	5.6	10	0.5	10
Current - Input Bias (nA)	1	1	15	0.001	0.001	100	0.00005	15	0.00005
Voltage - Input Offset (mV)	1.7	1.7	0.1	1	1	3.5	0.85	0.4	1.5
Current - Supply (µA)	130	130	130	50	150	300	1200	100	800
Current - Output / Channel (mA)	160	160	60	10	12	45	—	—	50
Voltage - Supply Span Min (V)	2.7	2.7	2.7	1.7	1.7	2.5	2.7	1.8	2.7
Voltage - Supply Span Max (V)	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5	5.5
Operating Temperature (°C)	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 125	-40 to 85	-40 to 125
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOT-23-5 Thin	SOT-23-5 Thin	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	—	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation - LMV321SN3T1G (onsemi):

The LMV321SN3T1G is the closest functional equivalent to the LMV321IST5X. This part maintains identical electrical specifications across all critical parameters: 1 V/µs slew rate, 1 MHz gain bandwidth product, 1 nA input bias current, 1.7 mV input offset voltage, 130 µA supply current, and 160 mA output current. The device operates within the same supply voltage range (2.7 V to 5.5 V) and temperature range (-40°C to 85°C). The LMV321SN3T1G is active in production status and ROHS3 compliant, addressing the obsolescence of the original part. Package compatibility is maintained with SOT-23-5 Thin configuration. Inventory availability is substantial at 125,300 pieces.

Secondary Recommendation - LMV821M5X/NOPB (National Semiconductor):

The LMV821M5X/NOPB provides rail-to-rail output functionality with enhanced performance characteristics. This part maintains the same supply voltage range (2.5 V to 5.5 V minimum, overlapping with the original specification) and operating temperature range (-40°C to 85°C). Performance improvements include 2 V/µs slew rate and 5.6 MHz gain bandwidth product, providing faster signal processing capability. The device is active in production status with 20,200 pieces in inventory. Package configuration is SOT-23-5, maintaining mechanical compatibility. Supply current increases to 300 µA, and output current reduces to 45 mA, requiring circuit-level evaluation for specific applications.

Alternative Recommendation - MAX4230AUK+T (Analog Devices Inc./Maxim Integrated):

The MAX4230AUK+T offers enhanced performance specifications suitable for applications requiring higher bandwidth and faster slew rates. This part maintains rail-to-rail output, supply voltage range (2.7 V to 5.5 V), and surface-mount configuration. Performance enhancements include 10 V/µs slew rate and 10 MHz gain bandwidth product. Operating temperature range extends to 125°C, providing broader thermal capability. The device is active in production status and ROHS3 compliant. Supply current increases to 1.2 mA, requiring power budget assessment. Package is SOT-23-5 compatible. Inventory availability is 3,600 pieces.

Functional Alternative - MAX4291EUK+T (Analog Devices Inc./Maxim Integrated):

The MAX4291EUK+T provides rail-to-rail output with extended supply voltage range (1.8 V to 5.5 V minimum). This part is suitable for ultra-low-power applications with 100 µA supply current and 0.2 V/µs slew rate. Operating temperature range is -40°C to 85°C. The device is active in production status and ROHS3 compliant. Gain bandwidth product is 500 kHz, lower than the original specification, requiring evaluation for bandwidth-sensitive applications. Package is SOT-23-5 compatible. Inventory availability is 1,600 pieces.

Functional Alternative - MAX4490AUK+T (Analog Devices Inc./Maxim Integrated):

The MAX4490AUK+T provides rail-to-rail output with performance specifications exceeding the original part. This device maintains supply voltage range (2.7 V to 5.5 V) and offers 10 V/µs slew rate and 10 MHz gain bandwidth product. Operating temperature range extends to 125°C. The device is active in production status and ROHS3 compliant. Supply current is 800 µA with 50 mA output current capability. Package is SOT-23-5 compatible. Inventory availability is 7,834 pieces.

Non-Rail-to-Rail Alternatives - Rohm Semiconductor Parts:

The BD1321G-TR, BU7441G-TR, BU7441SG-TR, and BU7461G-TR are general-purpose amplifiers in SC-74A/SOT-753 packages. These parts do not specify rail-to-rail output capability and feature different electrical characteristics. BD1321G-TR provides 3 MHz gain bandwidth product with 15 nA input bias current. BU7441G-TR and BU7441SG-TR offer 0.3 V/µs slew rate and 600 kHz gain bandwidth product with 1 pA input bias current and 50 µA supply current. BU7461G-TR provides 1 V/µs slew rate and 1 MHz gain bandwidth product with 1 pA input bias current. These parts are suitable for applications where rail-to-rail output is not required and where package transition from TSOT-5 to SC-74A/SOT-753 is acceptable. All are active in production status and ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q1: Can the LMV321SN3T1G directly replace the LMV321IST5X without circuit modification?

A: Yes. The LMV321SN3T1G maintains identical electrical specifications across all critical parameters: slew rate (1 V/µs), gain bandwidth product (1 MHz), input bias current (1 nA), input offset voltage (1.7 mV), supply current (130 µA), output current (160 mA), supply voltage range (2.7 V to 5.5 V), and operating temperature range (-40°C to 85°C). Package configuration is SOT-23-5 Thin, providing mechanical compatibility. No circuit modifications are required.

Q2: What is the primary difference between rail-to-rail and non-rail-to-rail output specifications?

A: Rail-to-rail output capability indicates the operational amplifier can swing its output voltage to within a specified margin of both the positive and negative supply rails. Non-rail-to-rail devices have output voltage limitations that prevent full utilization of the supply voltage range. For the LMV321IST5X, rail-to-rail output is specified. Substitute parts maintaining this specification (LMV321SN3T1G, LMV821M5X/NOPB, MAX4230AUK+T, MAX4291EUK+T, MAX4490AUK+T) are direct functional equivalents. Parts without specified rail-to-rail output (BD1321G-TR, BU7441G-TR, BU7461G-TR) require circuit-level evaluation.

Q3: Are the Rohm Semiconductor parts (BD1321G-TR, BU7441G-TR, BU7461G-TR) suitable substitutes?

A: These parts are general-purpose amplifiers with compatible supply voltage ranges and operating temperatures. However, they do not specify rail-to-rail output capability and feature different electrical characteristics. BD1321G-TR provides higher gain bandwidth product (3 MHz) but higher input bias current (15 nA). BU7441G-TR and BU7461G-TR offer lower supply current (50 µA and 150 µA respectively) but different slew rates and gain bandwidth products. These parts are functional alternatives suitable for applications where rail-to-rail output is not required. Package configuration differs (SC-74A/SOT-753 versus TSOT-5), requiring PCB layout evaluation.

Q4: What are the package compatibility considerations between TSOT-5 and SC-74A/SOT-753?

A: Both TSOT-5 (SOT-23-5 Thin) and SC-74A (SOT-753) are 5-pin surface-mount packages with identical pin counts and similar footprints. TSOT-5 is a thinner variant of the standard SOT-23-5 package. SC-74A/SOT-753 is a standard small-outline package. Pin assignments are identical for single-channel operational amplifiers. PCB footprints are mechanically compatible with minor dimensional differences. Reflow soldering parameters may require adjustment based on package thickness specifications. Consult device datasheets for precise footprint dimensions and thermal characteristics.

Q5: Which substitute part offers the best performance improvement over the LMV321IST5X?

A: The MAX4230AUK+T and MAX4490AUK+T offer the most significant performance improvements, providing 10 V/µs slew rate and 10 MHz gain bandwidth product compared to the original 1 V/µs and 1 MHz specifications. These parts maintain rail-to-rail output, supply voltage range (2.7 V to 5.5 V), and SOT-23-5 package compatibility. Operating temperature range extends to 125°C. Supply current increases to 1.2 mA (MAX4230AUK+T) and 800 µA (MAX4490AUK+T), requiring power budget assessment. These parts are suitable for applications requiring higher bandwidth and faster signal processing.

Q6: What is the significance of the obsolete product status of the LMV321IST5X?

A: Obsolete status indicates the manufacturer has discontinued production and support for this part. Long-term availability cannot be assured, and existing inventory will eventually deplete. Substitution with active production parts ensures long-term supply chain reliability and access to technical support. All recommended substitute parts maintain active production status, ensuring continued availability and manufacturer support throughout the product lifecycle.

Q7: Are there supply voltage range differences between substitute parts that affect compatibility?

A: The LMV321IST5X operates from 2.7 V to 5.5 V. Most substitute parts maintain this range. LMV821M5X/NOPB operates from 2.5 V minimum (compatible), MAX4291EUK+T operates from 1.8 V minimum (extended range), and BU7441G-TR and BU7461G-TR operate from 1.7 V minimum (extended range). All parts maintain 5.5 V maximum. Extended minimum voltage ranges provide additional flexibility for low-voltage applications. Standard applications within the 2.7 V to 5.5 V range are compatible with all substitute parts.

Q8: How do input bias current differences affect circuit design?

A: Input bias current represents the DC current flowing into the operational amplifier input terminals. The LMV321IST5X specifies 1 nA. Substitute parts vary: LMV321SN3T1G (1 nA), BD1321G-TR (15 nA), BU7441G-TR and BU7461G-TR (1 pA), LMV821M5X/NOPB (100 nA), MAX4230AUK+T and MAX4490AUK+T (50 pA), MAX4291EUK+T (15 nA). Higher input bias currents require larger input impedances to minimize offset voltage errors. Applications with high-impedance input sources may require careful part selection. Low input bias current parts (BU7441G-TR, BU7461G-TR, MAX4230AUK+T, MAX4490AUK+T) are preferred for high-impedance circuits.

Q9: What is the impact of slew rate differences on circuit performance?

A: Slew rate defines the maximum rate of change of output voltage per unit time. The LMV321IST5X specifies 1 V/µs. Substitute parts range from 0.2 V/µs (MAX4291EUK+T) to 10 V/µs (MAX4230AUK+T, MAX4490AUK+T). Lower slew rates limit the maximum frequency and amplitude of output signals. Higher slew rates enable faster signal transitions and higher-frequency operation. Applications requiring high-speed signal processing benefit from higher slew rate parts. Low-speed, low-power applications may utilize lower slew rate parts for reduced power consumption.

Q10: Which substitute part is recommended for cost-sensitive applications?

A: The LMV321SN3T1G offers the best cost-to-performance ratio as a direct electrical equivalent with identical specifications and active production status. The MAX4291EUK+T provides ultra-low-power operation (100 µA supply current) suitable for battery-powered applications. The BU7441G-TR and BU7461G-TR offer reduced supply current (50 µA and 150 µA respectively) for power-constrained designs. Specific cost and availability information should be obtained from authorized distributors for current pricing and inventory status.

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