LM2902NG Equivalent & Substitute Parts

Part Overview

The LM2902NG 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 classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production requirements. The LM2902NG operates across a wide supply voltage range of 3V to 32V and maintains performance across industrial temperature ranges from -40°C to 105°C. Substitution is required due to the obsolete product status and potential supply discontinuation.

Key Parameters

Parameter	Value	Unit
Manufacturer	onsemi	—
Part Number	LM2902NG	—
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Gain Bandwidth Product	1	MHz
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 LM2902NG is determined by the following critical parameters: amplifier type (general purpose versus J-FET), number of circuits (4 independent channels), gain bandwidth product (1 MHz baseline), supply voltage range compatibility (minimum 3V, maximum 32V or higher), output current capability (40 mA per channel), input bias current characteristics, and package form factor (14-DIP through-hole mounting).

Substitute parts are grouped into two primary categories:

Category 1: Direct General-Purpose Substitutes — Parts maintaining identical amplifier type (general purpose), four circuits, 1 MHz gain bandwidth product, and compatible supply voltage ranges. These include the LM2902DR2G (surface-mount variant), LM2902N (STMicroelectronics, through-hole), LM224AN, LM224KAN, and LM224KN. These substitutes preserve the original electrical performance envelope.

Category 2: J-FET Amplifier Alternatives — Parts with J-FET input architecture offering superior input bias current performance (20 pA to 50 pA versus 90 nA), higher gain bandwidth products (4 MHz), and enhanced slew rates (13V/µs to 16V/µs). These include LF347BN, LF347N, LF347N/NOPB, LF444ACN/NOPB, and LF444CN/NOPB. J-FET substitutes require verification of supply voltage requirements, as some variants specify fixed ±18V or ±22V supplies rather than the LM2902NG's flexible 3V to 32V range.

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Circuits	GBW (MHz)	Input Bias (nA/pA)	Input Offset (mV)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package	Status
LM2902NG	onsemi	General Purpose	4	1	90 nA	2	40	3	32	-40 to 105	14-DIP	Obsolete
LM2902DR2G	onsemi	General Purpose	4	1	90 nA	2	40	3	32	-40 to 105	14-SOIC	Active
LM2902N	STMicroelectronics	General Purpose	4	1	20 nA	2	40	3	30	-40 to 125	14-DIP	Obsolete
LM224AN	STMicroelectronics	General Purpose	4	1.3	20 nA	2	30	3	30	-40 to 105	14-DIP	Obsolete
LM224KAN	Texas Instruments	General Purpose	4	1.2	15 nA	2	30	3	30	-25 to 85	14-DIP	Active
LM224KN	Texas Instruments	General Purpose	4	1.2	20 nA	3	30	3	30	-25 to 85	14-DIP	Active
LF347BN	onsemi	J-FET	4	4	50 pA	3	—	36	36	0 to 70	14-DIP	Obsolete
LF347N	STMicroelectronics	J-FET	4	4	20 pA	3	40	44	44	0 to 70	14-DIP	Obsolete
LF347N/NOPB	Texas Instruments	J-FET	4	4	50 pA	5	—	36	36	0 to 70	14-DIP	Active
LF444ACN/NOPB	Texas Instruments	J-FET	4	1	10 pA	2	14	44	44	0 to 70	14-DIP	Active
LF444CN/NOPB	Texas Instruments	J-FET	4	1	10 pA	3	14	36	36	0 to 70	14-DIP	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

The LM2902DR2G represents the most direct functional equivalent, maintaining all electrical specifications of the LM2902NG while offering active product status and higher inventory availability (205,100 units). The primary distinction is packaging: LM2902DR2G utilizes 14-SOIC surface-mount form factor rather than through-hole DIP. This substitution requires PCB redesign for surface-mount assembly.

The LM2902N (STMicroelectronics) provides through-hole DIP packaging identical to the original LM2902NG with improved input bias current (20 nA versus 90 nA) and extended operating temperature range (-40°C to 125°C). However, maximum supply voltage is reduced to 30V. This part is obsolete but maintains 8,041 units in inventory.

For Active Product Status with Through-Hole Packaging:

The LM224KAN and LM224KN (Texas Instruments) are active products offering through-hole 14-DIP packaging with general-purpose amplifier architecture. Both maintain 3V to 30V supply compatibility and 1.2 MHz gain bandwidth product. Operating temperature range is restricted to -25°C to 85°C. Output current per channel is reduced to 30 mA. These parts are suitable for applications not requiring the full -40°C to 105°C temperature range of the original LM2902NG.

For Superior Input Characteristics (J-FET Architecture):

The LF347N/NOPB (Texas Instruments) is an active J-FET amplifier offering exceptional input bias current (50 pA), 4 MHz gain bandwidth product, and ROHS3 compliance. This part requires ±18V (36V total) fixed supply voltage and operates across 0°C to 70°C. Substitution is appropriate for applications prioritizing low input bias current and higher bandwidth over the original supply voltage flexibility.

The LF444CN/NOPB (Texas Instruments) is an active J-FET amplifier with the lowest input bias current (10 pA) and 1 MHz gain bandwidth product matching the original LM2902NG. This part requires ±18V (36V total) fixed supply and operates across 0°C to 70°C. Output current is limited to 14 mA per channel. Substitution is appropriate for precision instrumentation applications requiring minimal input bias current.

Compliance and Regulatory Status:

All recommended active substitutes (LM2902DR2G, LM224KAN, LM224KN, LF347N/NOPB, LF444ACN/NOPB, LF444CN/NOPB) maintain ROHS3 compliance and REACH unaffected status. Moisture sensitivity level is 1 (unlimited) for all parts, indicating no special handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the LM2902DR2G directly replace the LM2902NG in existing designs?

A: The LM2902DR2G maintains identical electrical specifications and performance characteristics. However, it utilizes 14-SOIC surface-mount packaging rather than the through-hole 14-DIP package of the LM2902NG. Direct PCB substitution is not possible without redesign for surface-mount assembly. Electrical functionality is fully compatible.

Q: What is the primary difference between general-purpose and J-FET amplifier substitutes?

A: General-purpose amplifiers (LM2902, LM224 series) utilize bipolar input stages with input bias currents in the nanoampere range (15 nA to 90 nA). J-FET amplifiers (LF347, LF444 series) utilize field-effect transistor input stages with input bias currents in the picoampere range (10 pA to 50 pA). J-FET variants offer superior input impedance and lower input bias current at the cost of fixed supply voltage requirements and reduced output current capability.

Q: Why do J-FET substitutes require different supply voltages?

A: The LM2902NG supports flexible supply voltages from 3V to 32V single supply or split supply operation. J-FET amplifiers such as the LF347N/NOPB and LF444CN/NOPB are designed for fixed ±18V (36V total) split supply operation. This architectural difference reflects different input stage design and biasing requirements. Applications using single supply or non-standard split supplies cannot use J-FET substitutes without additional power supply redesign.

Q: Is the LM224KAN suitable for applications requiring -40°C operation?

A: No. The LM224KAN operates across -25°C to 85°C, which does not meet the -40°C to 105°C range of the original LM2902NG. Applications requiring full industrial temperature range operation must select the LM2902N (STMicroelectronics) or LM2902DR2G (onsemi), both of which maintain -40°C minimum operating temperature.

Q: What is the significance of the 40 mA output current specification?

A: The LM2902NG provides 40 mA maximum output current per channel. The LM224 series reduces this to 30 mA per channel, and the LF444 series further reduces it to 14 mA per channel. Applications requiring high output current drive capability must verify that substitute parts meet minimum current requirements. Insufficient output current will result in output voltage clipping and distortion.

Q: Can the LF444CN/NOPB replace the LM2902NG in audio applications?

A: The LF444CN/NOPB is suitable for audio applications requiring low input bias current and low noise. However, substitution requires verification of three parameters: (1) fixed ±18V supply voltage availability, (2) 14 mA maximum output current per channel (versus 40 mA original), and (3) 0°C to 70°C operating temperature range (versus -40°C to 105°C original). Applications meeting these constraints can utilize the LF444CN/NOPB.

Q: What inventory considerations apply to obsolete versus active products?

A: The LM2902NG is classified as obsolete with 2,300 units in stock. Active substitutes such as LM2902DR2G (205,100 units), LM224KAN (1,425 units), LM224KN (1,105 units), LF347N/NOPB (1,315 units), LF444ACN/NOPB (2,200 units), and LF444CN/NOPB (16,259 units) offer long-term supply assurance. Selection of active products is recommended for new designs and production quantities exceeding current obsolete inventory levels.

Q: Does the LM2902N (STMicroelectronics) offer advantages over the LM2902NG?

A: The LM2902N provides improved input bias current (20 nA versus 90 nA), extended operating temperature range (-40°C to 125°C versus -40°C to 105°C), and identical through-hole 14-DIP packaging. Maximum supply voltage is reduced to 30V. The LM2902N is classified as obsolete with 8,041 units in inventory. This part is suitable for direct replacement in applications not requiring the full 32V maximum supply voltage of the original LM2902NG.

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