LM2902KDG4 Equivalent & Substitute Parts

Part Overview

The LM2902KDG4 is a general-purpose operational amplifier integrated circuit manufactured by Texas Instruments, featuring four independent amplifier circuits in a 14-SOIC surface-mount package. This device is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

The LM2902KDG4 operates across a wide supply voltage range of 3V to 26V and maintains performance across the industrial temperature range of -40°C to 125°C. With a gain-bandwidth product of 1.2 MHz and slew rate of 0.5V/µs, this component serves general-purpose amplification applications requiring moderate bandwidth and speed characteristics.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Gain Bandwidth Product	1.2	MHz
Slew Rate	0.5	V/µs
Current - Input Bias	20	nA
Voltage - Input Offset	3	mV
Current - Supply (x4 Channels)	1.4	mA
Current - Output / Channel	30	mA
Voltage - Supply Span (Min)	3	V
Voltage - Supply Span (Max)	26	V
Operating Temperature	-40 to 125	°C
Mounting Type	Surface Mount	—
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LM2902KDG4 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Number of circuits: 4 independent amplifier channels
Package type: 14-pin SOIC or compatible surface-mount configuration
Supply voltage range: Minimum 3V, maximum ≥26V
Operating temperature range: Minimum -40°C, maximum ≥125°C
Gain-bandwidth product: 1.2 MHz ±tolerance
Slew rate: 0.5V/µs ±tolerance
Output current per channel: 30 mA minimum
Input bias current: 20 nA nominal
Input offset voltage: 3 mV maximum

Secondary Compatibility Parameters:

RoHS3 compliance
Moisture sensitivity level MSL 1
Surface-mount assembly compatibility

Substitute parts are grouped into two categories based on performance alignment:

Category A - Direct Performance Equivalents: Parts maintaining the 1.2 MHz gain-bandwidth product and 0.5V/µs slew rate specifications with identical or superior electrical characteristics.

Category B - Functional Alternatives: Parts with reduced bandwidth (100 kHz to 800 kHz) or slew rate (0.05V/µs to 0.3V/µs) suitable for applications not requiring the full performance envelope of the LM2902KDG4.

Parameter Comparison

Part Number	Manufacturer	GBW (MHz)	Slew Rate (V/µs)	Input Bias (nA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Vcc Min (V)	Vcc Max (V)	Temp Range (°C)	Package	Status
LM2902KDG4	Texas Instruments	1.2	0.5	20	3	1.4	30	3	26	-40 to 125	14-SOIC	Discontinued
LM2902DR	Rohm Semiconductor	1.2	0.3	20	1	1	30	3	32	-40 to 125	14-SOPJ	Obsolete
LP2902M/NOPB	Texas Instruments	0.1	0.05	2	2	0.085	10	3	26	-40 to 85	14-SOIC	Active
LP2902MX/NOPB	Texas Instruments	0.1	0.05	2	2	0.085	10	3	26	-40 to 85	14-SOIC	Active
LM2902KD	Texas Instruments	1.2	0.5	20	3	1.4	30	3	26	-40 to 125	14-SOIC	Last Time Buy
BA2902SF-E2	Rohm Semiconductor	0.5	0.2	20	2	0.7	30	3	32	-40 to 105	14-SOP	Active
LM224DT	STMicroelectronics	1.3	0.4	20	2	1.5	40	3	30	-40 to 105	14-SOIC	Active
LM2902DR2G	onsemi	1	—	90	2	—	40	3	32	-40 to 105	14-SOIC	Active
LM2902DT	Rohm Semiconductor	0.8	0.3	20	1	1	30	3	32	-40 to 125	14-SOPJ	Not For New Designs
LM2902VDR2G	onsemi	1	—	90	2	—	40	3	32	-40 to 125	14-SOIC	Active
LM2902WDT	Rohm Semiconductor	1.3	0.3	20	1	1	40	3	32	-40 to 125	14-SOIC	Obsolete

Engineering Selection Recommendations

For Direct Replacement (Identical Performance Envelope):

The LM2902KD (Texas Instruments) provides the closest functional match to the LM2902KDG4, maintaining identical gain-bandwidth product (1.2 MHz), slew rate (0.5V/µs), input bias current (20 nA), and input offset voltage (3 mV). This part is currently in Last Time Buy status with 3,069 units in stock. The LM2902KD is supplied in 14-SOIC packaging with identical pinout and electrical specifications, supporting direct PCB substitution without design modification.

For Active Production Designs:

The LM224DT (STMicroelectronics) is recommended for new designs requiring sustained component availability. This part maintains a gain-bandwidth product of 1.3 MHz and slew rate of 0.4V/µs, both within acceptable tolerance of the original specification. The LM224DT offers superior output current capability (40 mA vs. 30 mA), extended supply voltage range (30V maximum), and active product status with 35,200 units in inventory. The 14-SOIC package ensures mechanical and electrical compatibility.

For Low-Power Applications:

The LP2902MX/NOPB (Texas Instruments, Tape & Reel) and LP2902M/NOPB (Texas Instruments, Tube) represent alternative solutions for applications where reduced power consumption is prioritized. These parts operate at 85 µA supply current versus 1.4 mA for the LM2902KDG4, with correspondingly reduced bandwidth (100 kHz) and slew rate (0.05V/µs). These specifications are suitable only for DC and low-frequency signal conditioning applications. Both variants are in active production with substantial inventory availability.

For Extended Temperature Range:

The LM2902VDR2G (onsemi, Tape & Reel) maintains the full -40°C to 125°C operating range with active product status and 45,400 units in stock. This part delivers 1 MHz gain-bandwidth product and 40 mA output current per channel. The onsemi variant is suitable for industrial and automotive temperature environments.

Compliance and Regulatory Status:

All recommended substitute parts maintain ROHS3 compliance, MSL 1 moisture sensitivity rating, and REACH unaffected status, ensuring regulatory equivalence to the original LM2902KDG4.

Frequently Asked Questions (FAQ)

Q: Can the LP2902M/NOPB or LP2902MX/NOPB be used as direct replacements for the LM2902KDG4?

A: No. While these parts share the same 14-SOIC package and pinout, they are not direct replacements. The LP2902 series operates at 100 kHz gain-bandwidth product and 0.05V/µs slew rate, compared to 1.2 MHz and 0.5V/µs for the LM2902KDG4. The LP2902 variants are suitable only for DC and low-frequency applications below 100 kHz. Applications requiring the full 1.2 MHz bandwidth of the original part will not function correctly with LP2902 substitutes.

Q: What is the difference between LM2902KD and LM2902KDG4?

A: The LM2902KD and LM2902KDG4 are electrically identical, differing only in packaging designation. Both are manufactured by Texas Instruments with identical electrical specifications: 1.2 MHz gain-bandwidth product, 0.5V/µs slew rate, 20 nA input bias current, and 3 mV input offset voltage. The LM2902KD is supplied in Tube packaging, while the LM2902KDG4 designation indicates a specific packaging variant. Both support direct PCB substitution.

Q: Are Rohm Semiconductor LM2902DR and LM2902DT suitable replacements?

A: The LM2902DR and LM2902DT are functionally compatible but not identical. Both maintain 20 nA input bias current and 30 mA output current per channel. However, the LM2902DR operates at 1.2 MHz gain-bandwidth product with 0.3V/µs slew rate, while the LM2902DT operates at 0.8 MHz gain-bandwidth product with 0.3V/µs slew rate. Both parts support the full -40°C to 125°C temperature range and 3V to 32V supply range. These parts are suitable for applications where the reduced slew rate is acceptable. Both are currently obsolete or not recommended for new designs.

Q: What is the advantage of the LM224DT over the LM2902KDG4?

A: The LM224DT (STMicroelectronics) offers three key advantages: (1) Active product status with 35,200 units in inventory versus discontinued status for the LM2902KDG4; (2) Superior output current capability of 40 mA per channel versus 30 mA; (3) Extended maximum supply voltage of 30V versus 26V. The gain-bandwidth product (1.3 MHz) and slew rate (0.4V/µs) are within acceptable tolerance of the original specification. The 14-SOIC package ensures direct PCB compatibility.

Q: Can I use the BA2902SF-E2 as a substitute?

A: The BA2902SF-E2 (Rohm Semiconductor) is a functional alternative with reduced performance specifications. This part operates at 500 kHz gain-bandwidth product and 0.2V/µs slew rate, approximately 40% of the original LM2902KDG4 specifications. The BA2902SF-E2 is suitable for applications with bandwidth requirements below 500 kHz. The part is in active production with 3,105 units in inventory. The 14-SOP package (4.40mm width) differs slightly from the original 14-SOIC (3.90mm width), requiring PCB layout verification before substitution.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape and Tape & Reel are packaging and delivery formats that do not affect electrical performance. Tape & Reel (TR) packaging is supplied on continuous carrier tape suitable for automated assembly equipment, typically used for high-volume production. Cut Tape (CT) is supplied in shorter tape segments suitable for lower-volume assembly or manual handling. Both formats contain identical components with identical electrical specifications. Selection depends on assembly process requirements, not electrical compatibility.

Q: Are the onsemi LM2902DR2G and LM2902VDR2G suitable for the LM2902KDG4 application?

A: The onsemi variants are functionally compatible with design considerations. Both parts maintain 1 MHz gain-bandwidth product, 40 mA output current per channel, and 3V to 32V supply range. However, the input bias current is specified at 90 nA versus 20 nA for the original part, representing a 4.5× increase. This higher bias current may affect precision analog circuits with high-impedance inputs. The LM2902VDR2G supports the full -40°C to 125°C temperature range, while the LM2902DR2G is limited to -40°C to 105°C. Both parts are in active production with substantial inventory.

Q: What should I verify before substituting the LM2902KDG4 in an existing design?

A: Verify the following parameters before substitution: (1) Gain-bandwidth product requirement—confirm whether the application requires the full 1.2 MHz or can operate at reduced bandwidth; (2) Slew rate requirement—verify that the substitute part's slew rate meets signal fidelity requirements; (3) Input bias current—confirm that the application can tolerate the substitute part's bias current without performance degradation; (4) Supply voltage range—verify that the substitute part's maximum supply voltage meets the design requirement; (5) Operating temperature range—confirm that the substitute part supports the required temperature extremes; (6) Package dimensions—verify that the substitute part's package footprint is compatible with the PCB layout; (7) Output current requirement—confirm that the substitute part can deliver the required load current.

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