LM2902KDR Equivalent & Substitute Parts

Part Overview

The LM2902KDR is a general-purpose operational amplifier integrated circuit manufactured by Rohm Semiconductor, configured as a 4-circuit device in a 14-SOIC surface mount package. This component is classified as obsolete, indicating discontinued production and limited availability through standard distribution channels. The Trophy series device operates across a wide supply voltage range (3V to 26V) and temperature span (-40°C to 125°C), making it suitable for general analog signal processing applications. Identification of equivalent and substitute parts is necessary due to product obsolescence and the need for design continuity in production environments.

Key Parameters

Parameter	Value	Unit
Amplifier Type	General Purpose	—
Number of Circuits	4	—
Slew Rate	0.3	V/µs
Gain Bandwidth Product	700	kHz
Current - Input Bias	20	nA
Voltage - Input Offset	3	mV
Current - Supply	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
Package / Case	14-SOIC (0.154", 3.90mm Width)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the LM2902KDR is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

Number of circuits: 4 channels required
Package type: 14-SOIC surface mount configuration
Supply voltage range: Minimum 3V, maximum ≥26V
Operating temperature range: Minimum -40°C, maximum ≥125°C
Mounting type: Surface mount only
RoHS and REACH compliance status

Performance Parameters (Secondary Consideration):

Slew rate: 0.3 V/µs or higher
Gain bandwidth product: 700 kHz or higher
Input bias current: 20 nA or lower
Input offset voltage: 3 mV or lower
Output current per channel: 30 mA or higher
Supply current: 1.4 mA or lower

Substitute parts are grouped into two categories: Direct Equivalents (matching all critical parameters within specification) and Compatible Alternatives (meeting critical parameters with enhanced performance characteristics).

Parameter Comparison

Part Number	Manufacturer	Slew Rate (V/µs)	GBW (kHz)	Input Bias (nA)	Input Offset (mV)	Supply Current (mA)	Output Current (mA)	Supply Min (V)	Supply Max (V)	Temp Range (°C)	Package	Status
LM2902KDR	Rohm Semiconductor	0.3	700	20	3	1.4	30	3	26	-40 to 125	14-SOIC	Obsolete
LM124D	STMicroelectronics	0.4	1200	20	2	1.5	30	3	30	-55 to 125	14-SOIC	Obsolete
LM124DG4	Texas Instruments	0.5	1200	20	3	1.4	30	3	30	-55 to 125	14-SOIC	Last Time Buy
LM124DR	Texas Instruments	0.5	1200	20	3	1.4	30	3	30	-55 to 125	14-SOIC	Active
LM124DRG4	Texas Instruments	0.5	1200	20	3	1.4	30	3	30	-55 to 125	14-SOIC	Discontinued at DiGi Electronics
LM124DT	STMicroelectronics	0.4	1300	20	2	1.5	40	3	30	-55 to 125	14-SOIC	Active
LM224AD	STMicroelectronics	0.4	1200	20	2	1.5	30	3	30	-40 to 105	14-SOIC	Obsolete
LM224ADR	Texas Instruments	0.5	1200	15	2	1.4	30	3	30	-25 to 85	14-SOIC	Active
LM224ADRG4	Texas Instruments	0.5	1200	15	2	1.4	30	3	30	-25 to 85	14-SOIC	Obsolete
LM224ADT	STMicroelectronics	0.4	1300	20	2	1.5	40	3	30	-40 to 105	14-SOIC	Active
LM224D	STMicroelectronics	0.4	1200	20	2	1.5	40	3	30	-40 to 105	14-SOIC	Active

Engineering Selection Recommendations

Primary Recommendation: LM124DR (Texas Instruments)

The LM124DR is the preferred substitute for the LM2902KDR. This part maintains active product status with high inventory availability (171,766 units in stock). It meets all critical electrical parameters with enhanced performance: slew rate of 0.5 V/µs (versus 0.3 V/µs), gain bandwidth product of 1.2 MHz (versus 700 kHz), and extended maximum supply voltage of 30V (versus 26V). The operating temperature range extends to -55°C minimum, exceeding the LM2902KDR specification. The 14-SOIC package is identical. RoHS3 compliance and MSL Level 1 rating match the original component.

Secondary Recommendation: LM124DT (STMicroelectronics)

The LM124DT provides an alternative from STMicroelectronics with active product status and substantial inventory (10,200 units). This part offers enhanced output current capability (40 mA per channel versus 30 mA) and improved gain bandwidth product (1.3 MHz). The slew rate of 0.4 V/µs and input offset voltage of 2 mV represent performance improvements. Operating temperature range of -55°C to 125°C matches the LM2902KDR specification. Supply voltage range extends to 30V maximum.

Tertiary Recommendation: LM224ADT (STMicroelectronics)

The LM224ADT is suitable for applications with reduced temperature requirements (-40°C to 105°C). This part is actively produced with high inventory (34,870 units) and offers enhanced output current (40 mA per channel) and gain bandwidth product (1.3 MHz). It is appropriate for designs where the upper temperature limit of 105°C is acceptable.

Compatibility Considerations:

All recommended substitutes maintain the 14-SOIC surface mount package configuration and 4-circuit operational amplifier topology. Supply voltage compatibility is confirmed across the 3V to 26V range of the original part. All substitutes exceed or match the electrical performance specifications of the LM2902KDR. RoHS3 compliance and MSL Level 1 rating are consistent across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can the LM124DR directly replace the LM2902KDR without circuit modifications?

A: The LM124DR is electrically compatible with the LM2902KDR in the 14-SOIC package. All critical parameters (supply voltage range, operating temperature, circuit count, and output current) are met or exceeded. No circuit modifications are required for direct substitution.

Q: What is the difference between LM124DR and LM124DRG4?

A: Both parts are manufactured by Texas Instruments with identical electrical specifications and 14-SOIC packaging. The primary difference is product status: LM124DR maintains active status with 171,766 units in stock, while LM124DRG4 is discontinued at DiGi Electronics with 5,600 units available. LM124DR is the preferred selection for new designs.

Q: Why do some substitutes have a maximum supply voltage of 30V instead of 26V?

A: The LM124 series (LM124D, LM124DR, LM124DT) and LM224 series are designed with a 30V maximum supply rating, which exceeds the LM2902KDR specification of 26V. This represents an enhancement and does not create compatibility issues. Circuits designed for 26V operation function correctly with these substitutes.

Q: Is the LM224ADR suitable for the full temperature range of the LM2902KDR?

A: The LM224ADR operates from -25°C to 85°C, which is narrower than the LM2902KDR range of -40°C to 125°C. This part is suitable only for applications where the operating temperature remains within -25°C to 85°C. For full temperature range compatibility, select LM124DR or LM124DT.

Q: What is the significance of the "DT" and "D" package designations in STMicroelectronics parts?

A: Both designations indicate 14-SOIC surface mount packaging. The "DT" designation typically indicates cut tape and digi-reel packaging format, while "D" may indicate tube packaging. Electrical specifications and package dimensions are identical; the difference is in supply format only.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (LM124D, LM124DR, LM124DRG4, LM124DT, LM224AD, LM224ADR, LM224ADRG4, LM224ADT, LM224D) are RoHS3 compliant with MSL Level 1 (unlimited moisture sensitivity). Compliance status matches the original LM2902KDR.

Q: Which substitute offers the best long-term availability?

A: The LM124DR from Texas Instruments is the optimal choice for long-term availability. It maintains active product status with the highest inventory level (171,766 units) among all substitutes. This ensures continued supply for production requirements and design continuity.

Q: Can I use LM224 series parts as substitutes for LM2902KDR?

A: LM224 series parts (LM224AD, LM224ADR, LM224ADRG4, LM224ADT, LM224D) are compatible substitutes. However, the LM124 series is preferred due to superior product status and availability. LM224ADT and LM224D are actively produced alternatives if LM124 series parts are unavailable.

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