LPV321DCKRE4 Equivalent & Substitute Parts

Part Overview

The LPV321DCKRE4 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, indicating that Texas Instruments has discontinued active production and support. The LPV321DCKRE4 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 range.

Due to its obsolete status, sourcing new original inventory of the LPV321DCKRE4 presents supply chain challenges. Identifying equivalent and substitute parts ensures design continuity and maintains access to functionally compatible components for production, repair, and maintenance applications.

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	-40 to 85	°C
Package / Case	5-TSSOP, SC-70-5, SOT-353	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the LPV321DCKRE4 are grouped based on strict electrical and mechanical compatibility criteria. The primary substitution logic follows these parameters:

Electrical Compatibility Criteria:

Amplifier Type: General Purpose (single-channel)
Output Type: Rail-to-Rail
Supply Voltage Range: Minimum 2.7 V, Maximum 5 V or higher
Operating Temperature: -40°C to 85°C
Single Circuit Configuration

Mechanical Compatibility Criteria:

Package Type: SC-70-5 (5-TSSOP, SOT-353) or SOT-23-5 (SC-74A, SOT-753)
Surface Mount Technology
Moisture Sensitivity Level: 1 or 3

Substitution Groups:

Group 1: Same Package (SC-70-5) with Enhanced Performance Parts maintaining the identical SC-70-5 package footprint while offering improved electrical characteristics (higher slew rate, increased gain-bandwidth product, higher output current capability).

Group 2: Alternative Package (SOT-23-5) with Enhanced Performance Parts using the SOT-23-5 package, which is mechanically compatible through PCB layout adaptation, offering enhanced electrical performance.

Group 3: Same Electrical Characteristics, Different Packaging Parts from the LPV321 base product family maintaining the original low-power, low-speed electrical profile across different package options.

Parameter Comparison

Part Number	Manufacturer	Package	Product Status	Slew Rate (V/µs)	GBW (kHz)	Input Bias (nA)	Input Offset (mV)	Supply Current (µA)	Supply Span (V)	Output Current (mA)
LPV321DCKRE4	Texas Instruments	SC-70-5	Obsolete	0.1	237	2	1.5	9	2.7–5	—
LMV321M7/NOPB	Texas Instruments	SC-70-5	Active	1	1000	15	1.7	130	2.7–5.5	160
LMV321M7X/NOPB	Texas Instruments	SC-70-5	Active	1	1000	15	1.7	130	2.7–5.5	—
LMV321M5/NOPB	Texas Instruments	SOT-23-5	Active	1	1000	15	1.7	130	2.7–5.5	160
LMV321M5X/NOPB	Texas Instruments	SOT-23-5	Active	1	1000	15	1.7	130	2.7–5.5	—
LPV321M5/NOPB	Texas Instruments	SOT-23-5	Active	0.1	152	2	1.5	9	2.7–5	—
LPV321M5X/NOPB	National Semiconductor	SOT-23-5	Active	0.1	152	2	1.5	9	2.7–5	—
LPV321M7/NOPB	National Semiconductor	SC-70-5	Active	0.1	152	2	1.5	9	2.7–5	—
LPV321M7X/NOPB	National Semiconductor	SC-70-5	Active	0.1	152	2	1.5	9	2.7–5	—
AZV321KSTR-G1	Diodes Incorporated	SC-70-5	Active	1	1000	250	1.7	130	2.7–5.5	160

Engineering Selection Recommendations

For Direct Replacement (Same Package, Same Electrical Characteristics):

LPV321M7/NOPB and LPV321M7X/NOPB (National Semiconductor) maintain the SC-70-5 package and preserve the original electrical profile of the LPV321DCKRE4, including low slew rate (0.1 V/µs), low supply current (9 µA), and low input bias current (2 nA). Both parts are in active production status. Selection between these two depends on packaging requirements: LPV321M7/NOPB is supplied in bulk, while LPV321M7X/NOPB is supplied in tape and reel format.

For Enhanced Performance with Same Package:

LMV321M7/NOPB and LMV321M7X/NOPB (Texas Instruments) retain the SC-70-5 package while providing improved electrical performance: 10× higher slew rate (1 V/µs), 4.2× higher gain-bandwidth product (1 MHz), and 160 mA output current capability. These parts are in active production status. The extended supply voltage range (2.7–5.5 V) provides additional design margin. Selection between these two depends on packaging format: LMV321M7/NOPB is supplied in cut tape and Digi-Reel format, while LMV321M7X/NOPB is supplied in tape and reel format.

For Alternative Package with Matching Electrical Characteristics:

LPV321M5/NOPB and LPV321M5X/NOPB (Texas Instruments and National Semiconductor respectively) provide the same electrical characteristics as the original part in the SOT-23-5 package. These parts are in active production status. PCB layout modification is required to accommodate the different package footprint. LPV321M5/NOPB is supplied in tape and reel format, while LPV321M5X/NOPB is supplied in cut tape format.

For Alternative Package with Enhanced Performance:

LMV321M5/NOPB and LMV321M5X/NOPB (Texas Instruments) provide enhanced electrical performance in the SOT-23-5 package. Both parts are in active production status with high inventory availability (7100 and 65100 units respectively). PCB layout modification is required. LMV321M5/NOPB is supplied in cut tape and Digi-Reel format, while LMV321M5X/NOPB is supplied in cut tape and Digi-Reel format.

For Alternative Manufacturer:

AZV321KSTR-G1 (Diodes Incorporated) provides enhanced performance in the SC-70-5 package with active production status. This part features higher input bias current (250 nA) and moisture sensitivity level 3 (168 hours), which may require modified handling procedures compared to the original part's MSL 1 rating.

Compliance Considerations:

All recommended substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original LPV321DCKRE4. All parts are classified under HTSUS 8542.33.0001 and ECCN EAR99.

Frequently Asked Questions (FAQ)

Q: Can LMV321M7/NOPB directly replace LPV321DCKRE4 without circuit modification?

A: LMV321M7/NOPB is mechanically and electrically compatible for direct PCB replacement in the SC-70-5 package. However, the enhanced electrical characteristics (10× higher slew rate, 4.2× higher gain-bandwidth product, higher supply current) may affect circuit behavior in applications with tight bandwidth or power consumption constraints. Circuit validation is necessary for applications sensitive to these parameter changes.

Q: What is the difference between LPV321M7/NOPB and LPV321M7X/NOPB?

A: Both parts are electrically identical and use the SC-70-5 package. The difference is packaging format: LPV321M7/NOPB is supplied in bulk, while LPV321M7X/NOPB is supplied in tape and reel format. Selection depends on manufacturing process requirements and inventory management practices.

Q: Can SOT-23-5 package parts replace SC-70-5 package parts?

A: SOT-23-5 and SC-70-5 packages have different physical footprints and pin layouts. Direct PCB replacement is not possible without layout modification. However, electrical compatibility is maintained, allowing functional substitution with PCB redesign.

Q: Why does AZV321KSTR-G1 have higher input bias current (250 nA) compared to other substitutes?

A: AZV321KSTR-G1 is manufactured by Diodes Incorporated using different process technology than Texas Instruments and National Semiconductor parts. The higher input bias current reflects this manufacturing difference. Applications sensitive to input bias current effects should evaluate this parameter against circuit requirements.

Q: What is the significance of Moisture Sensitivity Level (MSL) differences?

A: The original LPV321DCKRE4 has MSL 1 (unlimited shelf life). AZV321KSTR-G1 has MSL 3 (168-hour floor life after moisture exposure). MSL 3 parts require controlled storage conditions and have limited time between package opening and soldering. All other substitute parts maintain MSL 1 rating.

Q: Are all substitute parts in active production?

A: Yes. All recommended substitute parts are in active production status. The original LPV321DCKRE4 is obsolete, making active-status substitutes necessary for ongoing supply chain continuity.

Q: Which substitute offers the best inventory availability?

A: LMV321M5X/NOPB offers the highest inventory availability at 65,100 units in stock. LMV321M7X/NOPB provides 35,200 units in the SC-70-5 package format.

Q: Do all substitutes support the same operating temperature range?

A: Yes. All substitute parts support the -40°C to 85°C operating temperature range, matching the original LPV321DCKRE4 specification.

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