LP2902N Equivalent & Substitute Parts Reference

Part Overview

The LP2902N is a general-purpose operational amplifier manufactured by Texas Instruments, configured as a 4-circuit integrated circuit in 14-DIP through-hole packaging. This device is classified as Last Time Buy, indicating discontinued production with limited remaining inventory (3180 pcs). The LP2902N operates across a supply voltage range of 3V to 26V and is suitable for low-speed, low-power analog signal processing applications requiring minimal input bias current and low supply current consumption.

Substitute parts are necessary due to the Last Time Buy status of the LP2902N. Alternative devices with equivalent or enhanced electrical characteristics are available in both through-hole and surface-mount packaging options, with active product status and extended availability.

Key Parameters

Parameter	Value	Unit	Significance for Substitution
Amplifier Type	General Purpose	—	Defines functional category and application scope
Number of Circuits	4	Circuits	Must match for pin-compatible replacement
Slew Rate	0.05	V/µs	Determines maximum rate of output voltage change
Gain Bandwidth Product	100	kHz	Defines frequency response and amplification limits
Current - Input Bias	2	nA	Critical for high-impedance input applications
Voltage - Input Offset	2	mV	Affects DC accuracy and precision applications
Current - Supply	150	µA	Power consumption per device
Current - Output / Channel	10	mA	Maximum output drive capability
Voltage - Supply Span (Min)	3	V	Minimum operating supply voltage
Voltage - Supply Span (Max)	26	V	Maximum operating supply voltage
Operating Temperature	-40 to 85	°C	Defines thermal operating range
Mounting Type	Through Hole	—	Determines PCB assembly compatibility
Package / Case	14-DIP (0.300", 7.62mm)	—	Physical footprint and pin configuration
RoHS Status	ROHS3 Compliant	—	Environmental and regulatory compliance

Substitute Part Grouping Explanation

Substitution of the LP2902N is determined by strict adherence to the following criteria:

Primary Substitution Criteria (Must Match):

Number of circuits: 4 circuits required
Amplifier type: General Purpose
Mounting type: Through Hole (for direct PCB replacement)
Package case: 14-DIP configuration
RoHS compliance: ROHS3 Compliant

Secondary Substitution Criteria (Electrical Compatibility):

Supply voltage range: Minimum 3V, maximum ≥26V
Input bias current: ≤2 nA (lower values acceptable)
Input offset voltage: ≤2 mV
Output current per channel: ≥10 mA
Operating temperature range: Must encompass -40°C to 85°C or be suitable for intended application

Acceptable Substitution Scenarios:

Direct Pin-Compatible Replacement (Same Package): Parts with identical 14-DIP through-hole packaging and matching electrical specifications within tolerance.
Enhanced Performance Substitutes: Parts with superior electrical characteristics (higher bandwidth, lower input bias current, higher output current) in the same package, provided supply voltage range remains compatible.
Surface-Mount Alternative (LP2902DR): Functionally equivalent but requires PCB redesign; suitable only when surface-mount assembly is feasible.

Parts that do not meet the primary criteria (different package type, different circuit count, or non-compliant RoHS status) are not suitable substitutes for direct replacement applications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Package Type	Slew Rate (V/µs)	GBW (kHz)	Input Bias (nA)	Supply Current (µA)	Output Current (mA)	Supply Span Max (V)	Temp Range (°C)	RoHS
LP2902N	Texas Instruments	Last Time Buy	14-DIP	0.05	100	2	150	10	26	-40 to 85	ROHS3
LP2902DR	Texas Instruments	Active	14-SOIC	0.05	100	2	85	10	32	-40 to 85	ROHS3
LP2902N/NOPB	Texas Instruments	Active	14-DIP	0.05	100	2	150	10	26	-40 to 85	ROHS3
LP324N/NOPB	Texas Instruments	Active	14-DIP	0.05	100	2	150	10	32	0 to 70	ROHS3
LM2902N/NOPB	Texas Instruments	Active	14-DIP	—	1000	45	1500	40	32	-40 to 85	ROHS3
LM324AN/NOPB	Texas Instruments	Active	14-DIP	—	1000	45	1500	40	32	0 to 70	ROHS3
LM324N/NOPB	Texas Instruments	Active	14-DIP	—	1000	45	1500	40	32	0 to 70	ROHS3
LM2902N	STMicroelectronics	Obsolete	14-DIP	0.4	1000	20	1500	40	30	-40 to 125	ROHS3
LM324AN	STMicroelectronics	Obsolete	14-DIP	0.4	1000	20	1500	40	30	0 to 70	ROHS3
LM324N	Intersil	Obsolete	14-DIP	—	—	45	1500	40	32	0 to 70	Non-compliant
KA324A	Fairchild Semiconductor	Active	14-DIP	—	—	40	1500	40	32	0 to 70	Undefined

Engineering Selection Recommendations

Tier 1: Direct Replacement (Recommended)

LP2902N/NOPB (Texas Instruments, Active Status)

Identical electrical specifications to the main part LP2902N
Same 14-DIP through-hole package
ROHS3 compliant
Active product status with extended availability (1055 pcs in stock)
Recommended for applications requiring exact parameter matching and -40°C to 85°C operating range

Tier 2: Pin-Compatible Substitutes with Enhanced Performance

LM2902N/NOPB (Texas Instruments, Active Status)

Same 14-DIP through-hole package
Enhanced electrical performance: 10× higher gain bandwidth product (1 MHz vs 100 kHz), 10× higher output current (40 mA vs 10 mA)
Higher supply current consumption (1500 µA vs 150 µA)
Higher input bias current (45 nA vs 2 nA)
Extended supply voltage range (3V to 32V vs 3V to 26V)
ROHS3 compliant, Active status
Suitable for applications requiring higher bandwidth and output drive capability
Recommended for -40°C to 85°C operating range

LM324AN/NOPB (Texas Instruments, Active Status)

Same 14-DIP through-hole package
Enhanced electrical performance equivalent to LM2902N/NOPB
Operating temperature range: 0°C to 70°C (narrower than LP2902N)
ROHS3 compliant, Active status
Suitable for commercial temperature range applications only

LM324N/NOPB (Texas Instruments, Active Status)

Same 14-DIP through-hole package
Enhanced electrical performance equivalent to LM2902N/NOPB
Operating temperature range: 0°C to 70°C
ROHS3 compliant, Active status
Highest inventory availability (43654 pcs)
Suitable for commercial temperature range applications

Tier 3: Surface-Mount Alternative

LP2902DR (Texas Instruments, Active Status)

Functionally equivalent to LP2902N with identical electrical specifications
14-SOIC surface-mount package (requires PCB redesign)
Lower supply current (85 µA vs 150 µA)
Extended supply voltage range (3V to 32V vs 3V to 26V)
ROHS3 compliant, Active status
Recommended only when surface-mount assembly is feasible and PCB redesign is acceptable

Tier 4: Obsolete Parts (Not Recommended for New Designs)

LM2902N (STMicroelectronics, Obsolete)

Obsolete status; use only for legacy system maintenance
Enhanced performance characteristics available in active alternatives

LM324AN (STMicroelectronics, Obsolete)

Obsolete status; use only for legacy system maintenance

LM324N (Intersil, Obsolete)

Obsolete status; RoHS non-compliant
Not suitable for new designs or RoHS-regulated applications

KA324A (Fairchild Semiconductor, Active)

Active status but undefined RoHS compliance
Moisture sensitivity level undefined
Not recommended due to incomplete compliance documentation

Selection Criteria Summary:

For new designs requiring exact LP2902N replacement: Select LP2902N/NOPB

For applications tolerating enhanced performance and higher power consumption: Select LM2902N/NOPB or LM324N/NOPB

For commercial temperature range (0°C to 70°C) applications: Select LM324AN/NOPB or LM324N/NOPB

For surface-mount assembly: Select LP2902DR

Frequently Asked Questions (FAQ)

Q1: Can LP2902N be directly replaced with LM2902N/NOPB in existing designs?

A: Yes, both devices share the same 14-DIP through-hole package and pin configuration. However, electrical characteristics differ significantly. The LM2902N/NOPB has 10× higher gain bandwidth product (1 MHz vs 100 kHz), 10× higher output current capability (40 mA vs 10 mA), and 10× higher input bias current (45 nA vs 2 nA). Direct substitution is electrically compatible but may alter circuit performance. Verify that the application can tolerate these parameter differences before substitution.

Q2: What is the difference between LP2902N and LP2902N/NOPB?

A: Both parts are manufactured by Texas Instruments with identical electrical specifications and 14-DIP packaging. The "/NOPB" suffix indicates "No Plumbum" (lead-free) packaging. The LP2902N/NOPB is the active product with extended availability, while the base LP2902N is Last Time Buy status. For new procurement, specify LP2902N/NOPB.

Q3: Is LP2902DR a suitable replacement for LP2902N?

A: LP2902DR is functionally equivalent with identical electrical specifications but uses 14-SOIC surface-mount packaging instead of 14-DIP through-hole. Direct PCB substitution is not possible without redesign. The LP2902DR offers lower supply current (85 µA vs 150 µA) and extended supply voltage range (32V vs 26V). Select LP2902DR only when surface-mount assembly is feasible.

Q4: Why do some substitute parts have higher input bias current?

A: Input bias current varies by device design and manufacturing process. The LP2902N features exceptionally low input bias current (2 nA), making it suitable for high-impedance input applications. Substitute parts like LM2902N/NOPB (45 nA) and LM324N/NOPB (45 nA) have higher input bias current but remain suitable for most general-purpose applications. For applications requiring input bias current below 5 nA, LP2902N or LP2902N/NOPB are required.

Q5: Can I use LM324AN or LM324N in place of LP2902N for industrial temperature applications?

A: No. LM324AN and LM324N operate only within 0°C to 70°C commercial temperature range, while LP2902N operates from -40°C to 85°C. For industrial or extended temperature applications requiring -40°C operation, use LP2902N/NOPB or LM2902N/NOPB. LM324 variants are unsuitable for temperatures below 0°C.

Q6: What is the significance of ROHS3 compliance for these parts?

A: ROHS3 compliance indicates the device meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All recommended substitute parts carry ROHS3 compliance, ensuring regulatory compliance for applications in regulated markets. The LM324N (Intersil) is RoHS non-compliant and unsuitable for regulated applications.

Q7: Which substitute part offers the best power efficiency?

A: LP2902DR offers the lowest supply current at 85 µA (for 4 channels), compared to 150 µA for LP2902N. However, LP2902DR requires surface-mount assembly. For through-hole applications, LP2902N and LP2902N/NOPB consume 150 µA. The LM2902N/NOPB and LM324 variants consume 1500 µA total, making them unsuitable for power-constrained applications.

Q8: Are there any obsolete parts I should avoid?

A: Yes. LM2902N (STMicroelectronics), LM324AN (STMicroelectronics), and LM324N (Intersil) are all marked Obsolete. While some inventory remains available, these parts have discontinued production and limited supply. For new designs, select only Active status parts: LP2902N/NOPB, LP2902DR, LM2902N/NOPB, LM324AN/NOPB, LM324N/NOPB, or KA324A.

Q9: What is the maximum output current per channel for each device?

A: LP2902N and LP2902N/NOPB: 10 mA per channel. LP2902DR: 10 mA per channel. LM2902N/NOPB, LM324AN/NOPB, LM324N/NOPB, LM2902N, LM324AN, LM324N, and KA324A: 40 mA per channel. Select LM-series devices for applications requiring output currents exceeding 10 mA.

Q10: Can I use KA324A as a substitute for LP2902N?

A: KA324A (Fairchild Semiconductor) shares the same 14-DIP package and 4-circuit configuration. However, RoHS compliance status is undefined, and moisture sensitivity level is vendor-undefined. Additionally, slew rate and gain bandwidth product specifications are not provided. Due to incomplete compliance documentation and missing electrical specifications, KA324A is not recommended as a substitute for LP2902N in regulated or critical applications.

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