LM2902SNG Equivalent & Substitute Parts

Part Overview

The LM2902SNG is a general-purpose operational amplifier integrated circuit manufactured by onsemi, featuring four independent amplifier circuits in a 14-pin DIP package. This device is designed for general-purpose amplification applications requiring a supply voltage range of 3V to 32V and operating temperatures from -40°C to 105°C.

The LM2902SNG is classified as an obsolete product. Identifying equivalent and substitute parts is necessary for design continuity, procurement planning, and system maintenance when original stock becomes unavailable or when transitioning to active product lines.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Current - Input Bias	90	nA
Voltage - Input Offset	2	mV
Current - Output / Channel	40	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	32	V
Operating Temperature	-40 to 105	°C
Mounting Type	Through Hole	—
Package / Case	14-DIP (0.300", 7.62mm)	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the LM2902SNG is determined by the following critical parameters:

Primary Substitution Criteria:

Amplifier Type: General Purpose
Number of Circuits: 4
Mounting Type: Through Hole (for direct PCB compatibility)
Package / Case: 14-DIP form factor
Voltage - Supply Span: Minimum 3V, Maximum ≥32V
Operating Temperature Range: Must encompass -40°C to 105°C or be compatible with application requirements
Current - Output / Channel: Minimum 40 mA

Substitution Categories:

Category 1: Direct Package Equivalent (14-DIP Through Hole) Parts maintaining identical or compatible 14-DIP through-hole packaging with general-purpose amplifier topology and matching electrical specifications.

Category 2: Surface Mount Alternative (14-SOIC) Parts with equivalent electrical specifications but different mounting technology (surface mount), suitable for designs transitioning to SMD assembly.

Category 3: Enhanced Performance Alternatives (J-FET Input) Parts with J-FET input stages offering superior input bias current characteristics, suitable for applications requiring lower input bias current despite different amplifier topology.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Number of Circuits	Current - Input Bias (nA)	Voltage - Input Offset (mV)	Current - Output / Channel (mA)	Voltage - Supply Min (V)	Voltage - Supply Max (V)	Operating Temp (°C)	Package	Mounting Type	Product Status
LM2902SNG	onsemi	General Purpose	4	90	2	40	3	32	-40 to 105	14-DIP	Through Hole	Obsolete
LM2902DR2G	onsemi	General Purpose	4	90	2	40	3	32	-40 to 105	14-SOIC	Surface Mount	Active
LM2902N	STMicroelectronics	General Purpose	4	20	2	40	3	30	-40 to 125	14-DIP	Through Hole	Obsolete
LM224N	STMicroelectronics	General Purpose	4	20	2	40	3	30	-40 to 105	14-DIP	Through Hole	Obsolete
LM248N	STMicroelectronics	General Purpose	4	30	1	25	44	44	-40 to 105	14-DIP	Through Hole	Obsolete
LM2900N	Texas Instruments	General Purpose	4	30	—	18	4.4	32	-40 to 85	14-DIP	Through Hole	Last Time Buy
LF347N	STMicroelectronics	J-FET	4	0.02	3	40	44	44	0 to 70	14-DIP	Through Hole	Obsolete
LF347N/NOPB	Texas Instruments	J-FET	4	0.05	5	40	36	36	0 to 70	14-DIP	Through Hole	Active
LF347BN	onsemi	J-FET	4	0.05	3	40	36	36	0 to 70	14-DIP	Through Hole	Obsolete
LF444ACN/NOPB	Texas Instruments	J-FET	4	0.01	2	14	44	44	0 to 70	14-DIP	Through Hole	Active
LF444CN/NOPB	Texas Instruments	J-FET	4	0.01	3	14	36	36	0 to 70	14-DIP	Through Hole	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

LM2902DR2G is the active-status equivalent of LM2902SNG, maintaining identical electrical specifications (90 nA input bias current, 2 mV input offset voltage, 40 mA output current per channel, 3V to 32V supply range, -40°C to 105°C operating temperature). The primary difference is packaging: LM2902DR2G uses 14-SOIC surface-mount technology instead of through-hole DIP. This part is ROHS3 compliant and carries active product status, ensuring long-term availability.

For Through-Hole DIP Compatibility with Extended Temperature Range:

LM2902N (STMicroelectronics) maintains 14-DIP through-hole packaging with identical electrical specifications to LM2902SNG. This part extends the operating temperature range to -40°C to 125°C and reduces input bias current to 20 nA. However, maximum supply voltage is limited to 30V (versus 32V for LM2902SNG). This part is ROHS3 compliant but classified as obsolete.

For General-Purpose Applications with Active Product Status:

LM2900N (Texas Instruments) provides a through-hole 14-DIP package with general-purpose amplifier topology. This part maintains compatibility with the 3V minimum supply requirement and 32V maximum supply requirement. However, it features reduced output current per channel (18 mA versus 40 mA) and a narrower operating temperature range (-40°C to 85°C). Product status is Last Time Buy, indicating limited future availability.

For Applications Requiring Superior Input Bias Current Performance:

LF347N/NOPB (Texas Instruments) offers J-FET input technology with dramatically reduced input bias current (50 pA versus 90 nA), suitable for high-impedance signal conditioning applications. This part maintains 14-DIP through-hole packaging and 40 mA output current per channel. Operating temperature range is 0°C to 70°C, and supply voltage is fixed at ±18V (36V span). Product status is active. This substitution is appropriate only when input bias current reduction justifies the narrower operating temperature and fixed supply voltage specifications.

For Low-Power Applications:

LF444CN/NOPB (Texas Instruments) provides ultra-low input bias current (10 pA) with minimal supply current (600 µA across four channels). This part is suitable for battery-powered or low-power applications. Output current per channel is limited to 14 mA, and operating temperature range is 0°C to 70°C. Product status is active and ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q1: Can LM2902DR2G directly replace LM2902SNG on a through-hole PCB?

No. LM2902DR2G uses 14-SOIC surface-mount packaging, while LM2902SNG uses 14-DIP through-hole packaging. Direct PCB substitution is not possible without redesigning the board layout or using an adapter. However, LM2902DR2G is electrically identical and suitable for new designs or boards redesigned for surface-mount assembly.

Q2: What is the key difference between general-purpose and J-FET amplifier types in this comparison?

General-purpose amplifiers (LM2902 series) use bipolar input stages with input bias currents in the nanoampere range (20-90 nA). J-FET amplifiers (LF347, LF444 series) use field-effect transistor input stages with input bias currents in the picoampere range (10-50 pA). J-FET types are superior for high-impedance applications but typically have narrower operating temperature ranges and fixed supply voltages.

Q3: Is LM2902N a suitable replacement for LM2902SNG?

LM2902N is electrically compatible for most applications, maintaining identical input offset voltage (2 mV), output current per channel (40 mA), and minimum supply voltage (3V). However, maximum supply voltage is reduced from 32V to 30V, and operating temperature range extends to 125°C (versus 105°C for LM2902SNG). Verify that your application does not require the full 32V supply capability before substituting.

Q4: Why does LM2900N have lower output current per channel than LM2902SNG?

LM2900N is designed with different output stage architecture, limiting output current to 18 mA per channel compared to 40 mA for LM2902SNG. This reduction reflects design optimization for different application classes. LM2900N is not suitable for applications requiring 40 mA output current per channel.

Q5: Can J-FET amplifiers (LF347, LF444) replace general-purpose amplifiers (LM2902) in all applications?

No. While J-FET amplifiers offer superior input bias current performance, they have narrower operating temperature ranges (0°C to 70°C versus -40°C to 105°C) and fixed supply voltages (±18V or ±22V). Substitution is appropriate only when input bias current reduction is a design requirement and the narrower operating specifications are acceptable.

Q6: What does "Last Time Buy" product status mean for LM2900N?

Last Time Buy indicates that the manufacturer has announced end-of-life for this product. Existing inventory may be available for a limited period, but no new production is planned. For new designs or long-term applications, select parts with Active product status such as LM2902DR2G or LF347N/NOPB.

Q7: Are all substitute parts ROHS3 compliant?

No. LF347BN (onsemi) is RoHS non-compliant. All other parts listed carry ROHS3 compliance certification. Verify RoHS compliance requirements for your application before selecting a substitute.

Q8: What is the significance of the 14-DIP package dimension (0.300", 7.62mm)?

This dimension specifies the width of the dual-in-line package. All 14-DIP parts listed share this standard dimension, ensuring mechanical compatibility with through-hole PCB footprints designed for 0.300" DIP packages. Surface-mount alternatives (14-SOIC) use different footprints and are not mechanically interchangeable.

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