LPV321IDBVRG4 Equivalent & Substitute Parts

Part Overview

The LPV321IDBVRG4 is a general-purpose operational amplifier manufactured by Texas Instruments, housed in a SOT-23-5 surface mount package. This device is classified as obsolete, indicating that Texas Instruments has discontinued active production and support. The LPV321IDBVRG4 features rail-to-rail output capability, making it suitable for low-voltage analog signal processing applications requiring single-supply operation across the 2.7 V to 5 V supply range.

Due to its obsolete status, sourcing new original inventory from the manufacturer is no longer available through standard distribution channels. Identifying functionally equivalent active alternatives ensures design continuity, maintains supply chain reliability, and provides access to components with improved performance characteristics or extended product lifecycle support.

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
Voltage - Supply Span (Min)	2.7	V
Voltage - Supply Span (Max)	5	V
Operating Temperature Range	-40 to 125	°C
Package / Case	SC-74A, SOT-753	—
Supplier Device Package	SOT-23-5	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LPV321IDBVRG4 is determined by the following critical parameters:

Package Compatibility: The original part uses SOT-23-5 (SC-74A, SOT-753) packaging. Substitutes must maintain identical or mechanically compatible package footprints to ensure PCB layout compatibility without redesign.

Electrical Performance Envelope: Substitute parts must operate within the specified supply voltage range (2.7 V to 5 V minimum and maximum). Rail-to-rail output capability is a functional requirement for this application category.

Single-Circuit Configuration: All substitutes must be single-channel general-purpose operational amplifiers to maintain functional equivalence.

Thermal Operating Range: The original part operates from -40°C to 125°C. Substitutes with -40°C to 85°C range remain compatible for applications not requiring the extended upper temperature limit.

Compliance and Certification: RoHS3 compliance and MSL Level 1 rating are maintained across all substitute options, ensuring regulatory and manufacturing process compatibility.

Substitutes are grouped into two categories based on package type: SOT-23-5 variants (LMV321M5/NOPB, LMV321M5X/NOPB, LPV321M5/NOPB, LPV321M5X/NOPB) and SC-70-5 variants (LMV321M7/NOPB, LMV321M7X/NOPB, LPV321M7/NOPB, LPV321M7X/NOPB). A third category includes the MCP6231 series from Microchip Technology, which offers enhanced performance characteristics while maintaining SOT-23-5 package compatibility.

Parameter Comparison

Parameter	LPV321IDBVRG4	LMV321M5/NOPB	LMV321M5X/NOPB	LMV321M7/NOPB	LMV321M7X/NOPB	LPV321M5/NOPB	LPV321M5X/NOPB	LPV321M7/NOPB	LPV321M7X/NOPB	MCP6231RT-E/OT	MCP6231T-E/OT
Amplifier Type	General Purpose	General Purpose	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	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	Rail-to-Rail	Rail-to-Rail
Slew Rate (V/µs)	0.1	1	1	1	1	0.1	0.1	0.1	0.1	0.15	0.15
Gain Bandwidth Product (kHz)	237	1000	1000	1000	1000	152	152	152	152	300	300
Current - Input Bias (nA)	2	15	15	15	15	2	2	2	2	0.001	0.001
Voltage - Input Offset (mV)	1.5	1.7	1.7	1.7	1.7	1.5	1.5	1.5	1.5	5	5
Current - Supply (µA)	9	130	130	130	130	9	9	9	9	20	20
Voltage - Supply Span Min (V)	2.7	2.7	2.7	2.7	2.7	2.7	2.7	2.7	2.7	1.8	1.8
Voltage - Supply Span Max (V)	5	5.5	5.5	5.5	5.5	5	5	5	5	6	6
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	-40 to 125	-40 to 125
Package / Case	SC-74A, SOT-753	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	SC-74A, SOT-753	SC-74A, SOT-753
Supplier Device Package	SOT-23-5	SOT-23-5	SOT-23-5	SC-70-5	SC-70-5	SOT-23-5	SOT-23-5	SC-70-5	SC-70-5	SOT-23-5	SOT-23-5
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Package-Compatible Substitutes (SOT-23-5):

The LMV321M5/NOPB and LMV321M5X/NOPB represent the primary recommended substitutes for the LPV321IDBVRG4. Both parts are manufactured by Texas Instruments and maintain active product status with substantial inventory availability (7,100 and 65,100 units respectively). These devices are electrically compatible within the 2.7 V to 5.5 V supply range and feature identical SOT-23-5 packaging, enabling direct PCB footprint compatibility. The LMV321 series exhibits enhanced performance characteristics, including 10× higher slew rate (1 V/µs versus 0.1 V/µs) and 4× higher gain bandwidth product (1 MHz versus 237 kHz), while maintaining RoHS3 compliance and MSL Level 1 rating. The operating temperature range is reduced to -40°C to 85°C, which remains suitable for standard industrial and commercial applications.

The LPV321M5/NOPB and LPV321M5X/NOPB maintain the original electrical performance characteristics of the obsolete part, including 0.1 V/µs slew rate, 152 kHz gain bandwidth product, and 2 nA input bias current. These variants are manufactured by National Semiconductor and retain active product status with 1,605 and 10,100 units in stock. These options preserve the low-power consumption profile (9 µA supply current) and are suitable for applications where the original performance envelope must be maintained exactly.

Alternative Package Option (SC-70-5):

The LMV321M7/NOPB and LMV321M7X/NOPB provide functionally equivalent substitution in the SC-70-5 (5-TSSOP) package format. These parts require PCB layout modification due to different pin spacing and package dimensions compared to SOT-23-5. Inventory availability is substantial (25,100 and 35,200 units respectively). The LPV321M7/NOPB and LPV321M7X/NOPB offer identical electrical performance to the original part in SC-70-5 packaging, with 18,251 and 10,200 units available.

Enhanced Performance Alternative (Microchip Technology):

The MCP6231RT-E/OT and MCP6231T-E/OT from Microchip Technology provide SOT-23-5 package compatibility with extended supply voltage range (1.8 V to 6 V) and full -40°C to 125°C operating temperature coverage. These devices feature superior input bias current performance (1 pA versus 2 nA) and higher gain bandwidth product (300 kHz). Supply current is 20 µA, representing a 2.2× increase over the original part. Both variants maintain RoHS3 compliance and MSL Level 1 rating, with inventory availability of 1,370 and 18,389 units respectively.

Product Status Consideration:

All recommended substitutes maintain active product status with Texas Instruments, National Semiconductor, or Microchip Technology, ensuring long-term availability, technical support, and continued manufacturing commitment. The obsolete status of the LPV321IDBVRG4 necessitates transition to one of these active alternatives to maintain supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the LMV321M5/NOPB be used as a direct replacement for the LPV321IDBVRG4 without PCB modification?

A: Yes. Both parts use identical SOT-23-5 packaging (SC-74A, SOT-753), enabling direct PCB footprint compatibility without layout changes. The LMV321M5/NOPB operates within the 2.7 V to 5.5 V supply range, which encompasses the original part's 2.7 V to 5 V specification. All pin assignments and functional characteristics are compatible.

Q: What is the primary difference between LMV321 and LPV321 series substitutes?

A: The LMV321 series offers enhanced performance with 1 V/µs slew rate and 1 MHz gain bandwidth product, compared to the LPV321 series at 0.1 V/µs and 152 kHz respectively. The LMV321 also exhibits higher supply current (130 µA versus 9 µA). Selection depends on whether the application requires the original low-power characteristics or benefits from improved dynamic performance.

Q: Are SC-70-5 package variants (M7 suffix) compatible with existing PCB designs for SOT-23-5?

A: No. SC-70-5 and SOT-23-5 packages have different physical dimensions and pin spacing. PCB layout redesign is required to accommodate SC-70-5 variants. Use SOT-23-5 variants (M5 suffix) for direct compatibility without redesign.

Q: What is the significance of the "X" suffix in part numbers like LMV321M5X/NOPB?

A: The "X" suffix indicates packaging format differences. LMV321M5X/NOPB is supplied in Digi-Reel® format, while LMV321M5/NOPB is supplied in standard Cut Tape (CT) format. Both parts are electrically identical; the suffix reflects only the distribution packaging method.

Q: Does the MCP6231 series offer advantages over the LMV321 for the LPV321IDBVRG4 application?

A: The MCP6231 series provides extended supply voltage range (1.8 V to 6 V versus 2.7 V to 5.5 V), full -40°C to 125°C temperature coverage matching the original part, and superior input bias current (1 pA). These advantages are offset by higher supply current (20 µA) and higher input offset voltage (5 mV). Selection depends on specific application requirements for voltage range, temperature, and power consumption.

Q: Is the reduced operating temperature range (-40°C to 85°C) of LMV321 variants acceptable for applications originally designed for -40°C to 125°C?

A: The reduced upper temperature limit of 85°C is acceptable for applications operating within standard industrial temperature ranges. Applications requiring operation above 85°C must use LPV321 variants or the MCP6231 series, which maintain the full -40°C to 125°C range.

Q: Are all substitute parts RoHS3 compliant and MSL Level 1 rated?

A: Yes. All recommended substitutes maintain RoHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing processes and regulatory requirements.

Q: What inventory considerations should guide substitute selection?

A: LMV321M5X/NOPB offers the highest inventory availability (65,100 units), providing maximum supply security. LMV321M7X/NOPB (35,200 units) and MCP6231T-E/OT (18,389 units) also provide substantial stock levels. Parts with lower inventory (LPV321M5/NOPB at 1,605 units) should be evaluated for long-term availability before design commitment.

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