LM2902VNG Equivalent & Substitute Parts

Part Overview

The LM2902VNG 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 through-hole mounting applications and operates across a wide supply voltage range of 3V to 32V with an operating temperature range of -40°C to 125°C.

The LM2902VNG is classified as an obsolete product. Identifying equivalent and substitute parts is necessary for design continuity, procurement flexibility, and long-term product support when original inventory becomes unavailable or when transitioning to active product lines.

Key Parameters

Parameter	Value	Unit
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 125	°C
Mounting Type	Through Hole	—
Package / Case	14-DIP (0.300", 7.62mm)	—

Substitute Part Grouping Explanation

Substitution of the LM2902VNG is determined by the following critical parameters:

Functional Equivalence Criteria:

Amplifier Type: General Purpose
Number of Circuits: 4
Gain Bandwidth Product: 1 MHz
Supply Voltage Range: Minimum 3V, Maximum ≥32V
Operating Temperature Range: Must encompass or match -40°C to 125°C

Package Compatibility Criteria:

Through-hole mounting packages (14-DIP, 14-PDIP) are direct pin-compatible substitutes
Surface-mount packages (14-SOIC) require PCB redesign but maintain electrical equivalence

Electrical Performance Criteria:

Current - Input Bias: ≤90 nA (lower values acceptable)
Voltage - Input Offset: ≤2 mV (lower values acceptable)
Current - Output / Channel: ≥40 mA (equal or higher acceptable)

Substitute parts are grouped into two categories: Through-Hole Direct Substitutes (same package footprint) and Surface-Mount Alternatives (electrical equivalents requiring package conversion).

Parameter Comparison

Part Number	Manufacturer	Amplifier Type	Circuits	GBW (MHz)	Input Bias (nA)	Input Offset (mV)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package	Mount Type	Status
LM2902VNG	onsemi	General Purpose	4	1	90	2	40	3	32	-40 to 125	14-DIP	Through Hole	Obsolete
KA324A	Fairchild Semiconductor	General Purpose	4	—	40	1.5	40	3	32	0 to 70	14-DIP	Through Hole	Active
LM2902VDR2G	onsemi	General Purpose	4	1	90	2	40	3	32	-40 to 125	14-SOIC	Surface Mount	Active
LF444CM/NOPB	Texas Instruments	J-FET	4	1	0.01	3	14	36	36	0 to 70	14-SOIC	Surface Mount	Active
LF444CMX/NOPB	Texas Instruments	J-FET	4	1	0.01	3	14	36	36	0 to 70	14-SOIC	Surface Mount	Active
LF444CN/NOPB	Texas Instruments	J-FET	4	1	0.01	3	14	36	36	0 to 70	14-DIP	Through Hole	Active
LM224AD	STMicroelectronics	General Purpose	4	1.2	20	2	30	3	30	-40 to 105	14-SOIC	Surface Mount	Obsolete
LM224AN	STMicroelectronics	General Purpose	4	1.3	20	2	30	3	30	-40 to 105	14-DIP	Through Hole	Obsolete
LM224D	STMicroelectronics	General Purpose	4	1.2	20	2	40	3	30	-40 to 105	14-SOIC	Surface Mount	Active
LM224KAD	Texas Instruments	General Purpose	4	1.2	15	2	30	3	30	-25 to 85	14-SOIC	Surface Mount	Last Time Buy

Engineering Selection Recommendations

Through-Hole Direct Substitutes (Pin-Compatible):

The KA324A (Fairchild Semiconductor) provides direct pin compatibility in 14-DIP packaging. This part maintains the four-circuit general-purpose amplifier configuration with identical supply voltage range (3V to 32V) and output current capability (40 mA per channel). The KA324A exhibits superior input bias current (40 nA versus 90 nA) and lower input offset voltage (1.5 mV versus 2 mV). However, the operating temperature range is restricted to 0°C to 70°C, which does not encompass the full -40°C to 125°C range of the LM2902VNG. This part is suitable for applications operating within the 0°C to 70°C window.

The LF444CN/NOPB (Texas Instruments) is a through-hole 14-DIP substitute with active product status. This J-FET amplifier offers significantly lower input bias current (10 pA) and maintains 1 MHz gain bandwidth product. The supply voltage specification is fixed at ±36V (dual supply), which differs from the single-supply range of the LM2902VNG. Operating temperature range is 0°C to 70°C. This part is applicable only in applications with ±36V dual supply architecture.

Surface-Mount Alternatives (Electrical Equivalents):

The LM2902VDR2G (onsemi) is the surface-mount variant of the LM2902VNG base product. It maintains identical electrical specifications: 1 MHz gain bandwidth product, 90 nA input bias current, 2 mV input offset voltage, 40 mA output current per channel, and -40°C to 125°C operating temperature. The 14-SOIC package requires PCB redesign but provides the closest electrical match. This part has active product status and high inventory availability (45,400 units).

The LM224D (STMicroelectronics) is a surface-mount general-purpose amplifier in 14-SOIC packaging with active product status. It provides 1.2 MHz gain bandwidth product, 20 nA input bias current, and 40 mA output current per channel. The maximum supply voltage is limited to 30V (versus 32V for the LM2902VNG). Operating temperature range is -40°C to 105°C, which covers most of the LM2902VNG range except the upper 20°C. This part is suitable for applications not requiring operation above 105°C.

Compliance and Certification Status:

All substitute parts listed maintain REACH Unaffected status and EAR99 ECCN classification, consistent with the original LM2902VNG. RoHS3 compliance is confirmed for active and last-time-buy parts. Moisture sensitivity level is uniformly rated as 1 (Unlimited) across all candidates.

Frequently Asked Questions (FAQ)

Q1: Can the KA324A directly replace the LM2902VNG in all applications?

The KA324A provides direct pin compatibility and maintains the same supply voltage range and output current specifications. However, the operating temperature range is restricted to 0°C to 70°C. Direct substitution is valid only for applications operating within this temperature window. Applications requiring operation below 0°C or above 70°C require alternative parts.

Q2: What is the primary difference between the LM2902VNG and LM2902VDR2G?

Both parts are manufactured by onsemi and share identical electrical specifications. The LM2902VNG uses through-hole 14-DIP packaging for breadboard and traditional PCB assembly, while the LM2902VDR2G uses surface-mount 14-SOIC packaging for automated assembly. The LM2902VDR2G has active product status with significantly higher inventory availability.

Q3: Why do the LF444 series parts have different supply voltage specifications?

The LF444 series are J-FET input amplifiers specified for ±36V dual supply operation, whereas the LM2902VNG is specified for single-supply operation from 3V to 32V. These represent fundamentally different circuit topologies. The LF444 series is suitable only for applications with dual supply architecture.

Q4: Is the LM224D suitable as a replacement for extended temperature applications?

The LM224D operates from -40°C to 105°C, which covers the lower and mid-range of the LM2902VNG specification (-40°C to 125°C) but does not extend to 125°C. Applications requiring operation above 105°C must use the LM2902VDR2G or equivalent onsemi parts that specify the full -40°C to 125°C range.

Q5: What are the key electrical differences between general-purpose and J-FET amplifier types?

General-purpose amplifiers (LM2902VNG, KA324A, LM224 series) are bipolar-input designs with input bias currents in the nanoampere range (15-90 nA). J-FET amplifiers (LF444 series) feature field-effect transistor inputs with input bias currents in the picoampere range (10 pA). J-FET designs are preferred for high-impedance signal sources but require different supply voltage configurations and have lower output current capability.

Q6: Can surface-mount parts be used in through-hole PCB designs?

Surface-mount parts require PCB redesign with appropriate landing pads and assembly process modifications. Direct mechanical substitution in through-hole designs is not possible without adapter components or PCB rework. Through-hole packages (14-DIP, 14-PDIP) are required for direct board-level compatibility.

Q7: What inventory considerations apply to substitute selection?

The LM2902VDR2G (onsemi surface-mount variant) has the highest inventory availability at 45,400 units. The LF444CMX/NOPB (Texas Instruments) has 30,100 units available. The KA324A (Fairchild Semiconductor through-hole) has 1,300 units. Inventory levels should be evaluated against long-term supply requirements and product lifecycle status.

Q8: Are all substitute parts RoHS3 compliant?

Active and last-time-buy parts (LM2902VDR2G, LM224D, LF444 series, LM224KAD) are confirmed RoHS3 compliant. Obsolete parts (LM224AD, LM224AN) carry RoHS3 compliance status. The original LM2902VNG does not specify RoHS status in the provided data.

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