LPV321IDCKR Equivalent & Substitute Parts

Part Overview

The LPV321IDCKR is a general-purpose operational amplifier manufactured by Texas Instruments, housed in a 5-TSSOP SC-70-5 package. This device is classified as obsolete and has been superseded by active alternatives within the LPV321 and LMV321 product families. The LPV321IDCKR provides rail-to-rail output capability with low power consumption, making it suitable for battery-powered and space-constrained applications. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	1	—
Output Type	Rail-to-Rail	—
Slew Rate	0.1	V/µs
Gain Bandwidth Product	237	kHz
Current - Input Bias	2	nA
Voltage - Input Offset	1.5	mV
Current - Supply	9	µA
Current - Output / Channel	72	mA
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	5	V
Operating Temperature	-40 to 125	°C
Mounting Type	Surface Mount	—
Package / Case	5-TSSOP, SC-70-5, SOT-353	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—
REACH Status	REACH Unaffected	—

Substitute Part Grouping Explanation

Substitution of the LPV321IDCKR is determined by compatibility across the following critical parameters: amplifier type (general purpose), number of circuits (1), output type (rail-to-rail), supply voltage range, operating temperature range, and package configuration. The substitute parts are grouped into two categories based on electrical performance characteristics and package type.

Category 1: LPV321 Series (Matched Electrical Performance) Parts LPV321M5/NOPB, LPV321M5X/NOPB, LPV321M7/NOPB, and LPV321M7X/NOPB maintain the original LPV321 electrical specifications including slew rate of 0.1 V/µs, gain bandwidth product of 152 kHz, input bias current of 2 nA, and supply current of 9 µA. These parts differ only in package type (SOT-23-5 or SC-70-5) and packaging format (tape & reel or bulk).

Category 2: LMV321 Series (Enhanced Electrical Performance) Parts LMV321M5/NOPB, LMV321M5X/NOPB, LMV321M7/NOPB, and LMV321M7X/NOPB provide improved electrical performance with slew rate of 1 V/µs, gain bandwidth product of 1 MHz, input bias current of 15 nA, and supply current of 130 µA. These parts are suitable for applications requiring higher bandwidth and faster response characteristics. The LMV321 series extends the maximum supply voltage to 5.5 V and reduces the maximum operating temperature to 85°C.

All substitute parts maintain rail-to-rail output capability, general-purpose amplifier classification, and single-circuit configuration. All substitute parts are active products with ROHS3 compliance and REACH unaffected status.

Parameter Comparison

Parameter	LPV321IDCKR (Main)	LPV321M5/NOPB	LPV321M5X/NOPB	LPV321M7/NOPB	LPV321M7X/NOPB	LMV321M5/NOPB	LMV321M5X/NOPB	LMV321M7/NOPB	LMV321M7X/NOPB
Manufacturer	Texas Instruments	Texas Instruments	National Semiconductor	National Semiconductor	National Semiconductor	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
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	Rail-to-Rail	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	0.1	0.1	0.1	0.1	0.1	1	1	1	1
Gain Bandwidth Product (kHz)	237	152	152	152	152	1000	1000	1000	1000
Current - Input Bias (nA)	2	2	2	2	2	15	15	15	15
Voltage - Input Offset (mV)	1.5	1.5	1.5	1.5	1.5	1.7	1.7	1.7	1.7
Current - Supply (µA)	9	9	9	9	9	130	130	130	130
Current - Output / Channel (mA)	72	—	—	—	—	160	—	160	—
Voltage - Supply Span Min (V)	2.7	2.7	2.7	2.7	2.7	2.7	2.7	2.7	2.7
Voltage - Supply Span Max (V)	5	5	5	5	5	5.5	5.5	5.5	5.5
Operating Temperature (°C)	-40 to 125	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85	-40 to 85
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	5-TSSOP, SC-70-5, SOT-353	SC-74A, SOT-753	SC-74A, SOT-753	5-TSSOP, SC-70-5, SOT-353	5-TSSOP, SC-70-5, SOT-353	SC-74A, SOT-753	SC-74A, SOT-753	5-TSSOP, SC-70-5, SOT-353	5-TSSOP, SC-70-5, SOT-353
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—	—	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	—	—	—	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For Direct Replacement with Identical Electrical Performance: Select LPV321M7/NOPB or LPV321M7X/NOPB when package compatibility with SC-70-5 is required and electrical specifications must match the original LPV321IDCKR. Both parts maintain the 0.1 V/µs slew rate, 152 kHz gain bandwidth product, and 9 µA supply current. LPV321M7/NOPB is available in bulk packaging, while LPV321M7X/NOPB is supplied in tape & reel format. Both are active products manufactured by National Semiconductor with ECCN EAR99 classification.

For Package Flexibility with Matched Electrical Performance: Select LPV321M5/NOPB or LPV321M5X/NOPB when SOT-23-5 package compatibility is acceptable. These parts provide identical electrical specifications to the LPV321M7 variants but in a smaller footprint. LPV321M5/NOPB is supplied in tape & reel format by Texas Instruments.

For Enhanced Performance Applications: Select LMV321M7/NOPB or LMV321M7X/NOPB when higher bandwidth and faster slew rate are required within the SC-70-5 package. These parts provide 1 V/µs slew rate and 1 MHz gain bandwidth product, representing a 10-fold improvement over the original LPV321IDCKR. The LMV321 series extends maximum supply voltage to 5.5 V. Operating temperature range is reduced to -40°C to 85°C. LMV321M7/NOPB is available in cut tape & digi-reel format with 25,100 units in stock. LMV321M7X/NOPB is supplied in tape & reel format with 35,200 units in stock.

For Enhanced Performance with Package Flexibility: Select LMV321M5/NOPB or LMV321M5X/NOPB when SOT-23-5 package is acceptable and enhanced electrical performance is required. LMV321M5/NOPB is available in cut tape & digi-reel format with 7,100 units in stock. LMV321M5X/NOPB is supplied in cut tape & digi-reel format with 65,100 units in stock, representing the highest inventory availability among all substitute options.

All substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with current environmental standards.

Frequently Asked Questions (FAQ)

Q: Can LMV321 series parts directly replace the LPV321IDCKR? A: LMV321 series parts are functionally compatible as direct replacements from an electrical interface perspective. However, the LMV321 series exhibits different electrical characteristics: 10-fold higher slew rate (1 V/µs vs. 0.1 V/µs), 4-fold higher gain bandwidth product (1 MHz vs. 237 kHz), higher input bias current (15 nA vs. 2 nA), and higher supply current (130 µA vs. 9 µA). Applications sensitive to these performance differences require circuit re-evaluation. The LMV321 series reduces maximum operating temperature to 85°C, which may not be suitable for applications requiring the full -40°C to 125°C range of the original part.

Q: What is the difference between LPV321M7/NOPB and LPV321M7X/NOPB? A: Both parts are electrically identical and housed in the SC-70-5 package. The primary difference is packaging format: LPV321M7/NOPB is supplied in bulk packaging, while LPV321M7X/NOPB is supplied in tape & reel format. Selection depends on assembly process requirements and inventory management practices.

Q: Are SOT-23-5 package parts (M5 variants) compatible with SC-70-5 footprints? A: No. SOT-23-5 and SC-70-5 are distinct package types with different pin configurations and physical dimensions. SOT-23-5 parts cannot be used as direct board-level replacements for SC-70-5 parts without PCB redesign. However, both package types provide identical electrical functionality and can be selected based on design requirements.

Q: Which substitute part has the highest inventory availability? A: LMV321M5X/NOPB has the highest inventory with 65,100 units in stock. This part is supplied in cut tape & digi-reel format by Texas Instruments in the SOT-23-5 package.

Q: Do all substitute parts maintain the same supply voltage range as the LPV321IDCKR? A: LPV321 series parts (LPV321M5, LPV321M5X, LPV321M7, LPV321M7X) maintain the original 2.7 V to 5 V supply range. LMV321 series parts extend the maximum supply voltage to 5.5 V, providing additional design flexibility for higher voltage applications.

Q: What is the impact of higher input bias current in LMV321 parts? A: LMV321 series parts have input bias current of 15 nA compared to 2 nA in LPV321 parts. This 7.5-fold increase may affect circuit performance in high-impedance applications where input bias current contributes to offset errors. Applications with input impedances exceeding 1 MΩ should evaluate the impact on overall system accuracy.

Q: Are all substitute parts RoHS3 compliant? A: LPV321 series parts from Texas Instruments and all LMV321 series parts are explicitly listed as ROHS3 compliant. LPV321M5X/NOPB and LPV321M7/NOPB from National Semiconductor do not have RoHS status specified in the provided data. Verification with the manufacturer is required for these parts if RoHS3 compliance is a design requirement.

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