Request Quote
(Ships tomorrow)
LM2902WDT Equivalent & Substitute Parts
Part Overview
The LM2902WDT is a general-purpose operational amplifier integrated circuit manufactured by Rohm Semiconductor, configured as a 4-circuit operational amplifier in a 14-SOIC surface mount package. This device is classified as obsolete, indicating that the original manufacturer has discontinued production. The LM2902WDT operates across a wide supply voltage range of 3V to 32V and maintains performance across an extended temperature range of -40°C to 125°C, making it suitable for industrial and consumer applications requiring general-purpose amplification.
Due to its obsolete status, identifying equivalent and substitute parts is essential for design continuity, production support, and long-term component availability. Substitute parts must maintain electrical compatibility across critical parameters including supply voltage range, input bias current, output current capability, and package configuration to ensure functional equivalence in existing circuit designs.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Amplifier Type | General Purpose | — |
| Number of Circuits | 4 | — |
| Slew Rate | 0.3 | V/µs |
| Gain Bandwidth Product | 1.3 | MHz |
| Current - Input Bias | 20 | nA |
| Voltage - Input Offset | 1 | mV |
| Current - Supply | 1 | mA |
| 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 | Surface Mount | — |
| Package / Case | 14-SOIC (0.154", 3.90mm Width) | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the LM2902WDT are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:
Critical Matching Parameters:
- Number of circuits: 4 (quad configuration required)
- Package type: 14-SOIC surface mount form factor
- Input bias current: 20 nA (standard for general-purpose amplifiers)
- Output current per channel: 40 mA minimum
- Supply voltage range: Minimum 3V to maximum 30V or higher
- Operating temperature range: Must support -40°C to 125°C or equivalent industrial range
Substitution Logic: Substitute parts are grouped into two categories based on product status and availability. Active status parts represent current production alternatives with full manufacturer support. Obsolete or discontinued parts represent legacy equivalents that may be available through inventory channels but lack ongoing production support.
The AS324 series from Diodes Incorporated provides direct electrical equivalence with active product status across multiple packaging options. The LM124 series from Texas Instruments and STMicroelectronics offers functional equivalence with differential output configuration and extended temperature range support. All substitute candidates maintain the 14-SOIC package footprint and 4-circuit configuration required for direct board-level replacement.
Parameter Comparison
| Parameter | LM2902WDT (Main) | AS324AMTR-E1 | AS324MTR-E1 | AS324MTR-G1 | LM124DR | LM124DT | LM224D |
|---|---|---|---|---|---|---|---|
| Manufacturer | Rohm Semiconductor | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Texas Instruments | STMicroelectronics | STMicroelectronics |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active |
| Number of Circuits | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Current - Input Bias (nA) | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Voltage - Input Offset (mV) | 1 | 2 | 2 | 2 | 3 | 2 | 2 |
| Current - Supply (mA) | 1 | 1 | 1 | 1 | 1.4 | 1.5 | 1.5 |
| Current - Output / Channel (mA) | 40 | 40 | 40 | 40 | 30 | 40 | 40 |
| Voltage - Supply Span (Min) (V) | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Voltage - Supply Span (Max) (V) | 32 | 36 | 36 | 36 | 30 | 30 | 30 |
| Operating Temperature (°C) | -40 to 125 | -40 to 85 | -40 to 85 | -40 to 85 | -55 to 125 | -55 to 125 | -40 to 105 |
| Slew Rate (V/µs) | 0.3 | — | — | — | 0.5 | 0.4 | 0.4 |
| Gain Bandwidth Product (MHz) | 1.3 | — | — | — | 1.2 | 1.3 | 1.2 |
| Package / Case | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SOIC | 14-SO | 14-SO |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) | 1 (Unlimited) | 3 (168 Hours) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Primary Substitute Recommendation: AS324MTR-G1
The AS324MTR-G1 from Diodes Incorporated is the preferred substitute for the LM2902WDT. This part maintains active production status, ensuring long-term availability and manufacturer support. It provides electrical equivalence across all critical parameters: 4-circuit configuration, 20 nA input bias current, 40 mA output current per channel, and 3V to 36V supply voltage range. The AS324MTR-G1 operates across -40°C to 85°C, which covers the lower portion of the LM2902WDT temperature range. MSL rating of 1 (Unlimited) matches the original part specification, eliminating moisture sensitivity concerns during storage and handling.
Secondary Substitute Recommendation: LM124DR
The LM124DR from Texas Instruments provides functional equivalence with extended temperature range coverage (-55°C to 125°C), exceeding the LM2902WDT specification. This part maintains active production status and MSL rating of 1 (Unlimited). The LM124DR operates across 3V to 30V supply voltage, which is compatible with the LM2902WDT maximum specification of 32V. Output current per channel is specified at 30 mA, which is lower than the LM2902WDT 40 mA specification and must be evaluated for specific circuit requirements.
Tertiary Substitute Recommendation: LM124DT
The LM124DT from STMicroelectronics offers active product status with extended temperature range (-55°C to 125°C) and MSL rating of 1 (Unlimited). This part provides 40 mA output current per channel and 1.3 MHz gain bandwidth product, matching the LM2902WDT specification. The 14-SO package designation indicates compatibility with 14-SOIC footprint requirements. Supply voltage range of 3V to 30V is compatible with the LM2902WDT specification.
Compliance Considerations:
All recommended substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the environmental and regulatory compliance profile of the LM2902WDT. All parts are classified under ECCN EAR99 and HTSUS 8542.33.0001, maintaining consistent export and tariff classification.
Frequently Asked Questions (FAQ)
Q: Can the AS324AMTR-E1 be used as a direct replacement for the LM2902WDT?
A: The AS324AMTR-E1 provides electrical equivalence across critical parameters including 4-circuit configuration, 20 nA input bias current, and 40 mA output current per channel. However, the operating temperature range is limited to -40°C to 85°C, which does not extend to the LM2902WDT maximum of 125°C. This part is suitable for applications operating within the -40°C to 85°C range. MSL rating of 1 (Unlimited) matches the original specification.
Q: What is the difference between the AS324 variants (AMTR-E1, MTR-E1, MTR-G1)?
A: All three AS324 variants from Diodes Incorporated provide identical electrical specifications. The primary differences are packaging configuration and moisture sensitivity level. AS324AMTR-E1 and AS324MTR-G1 both carry MSL rating of 1 (Unlimited), while AS324MTR-E1 carries MSL rating of 3 (168 Hours). The "A" designation in AMTR-E1 indicates a specific manufacturing variant. All three are supplied in Tape & Reel packaging and operate across -40°C to 85°C.
Q: Why do the LM124 series parts specify lower output current (30 mA) compared to the LM2902WDT (40 mA)?
A: The LM124 series is configured with differential output architecture, which affects output current specification. The LM124DR and LM124DG4 specify 30 mA per channel, while the LM124DT specifies 40 mA per channel. Circuit designs requiring the full 40 mA output current should prioritize the LM124DT or AS324 series substitutes to maintain output current margin.
Q: Are there package compatibility concerns between 14-SOIC and 14-SO designations?
A: The 14-SOIC and 14-SO designations both refer to 14-pin small-outline integrated circuit packages with 0.154" (3.90mm) width. These packages are mechanically and electrically compatible for PCB footprint purposes. The designation difference reflects manufacturing process variations between suppliers but does not affect board-level compatibility.
Q: What is the significance of MSL (Moisture Sensitivity Level) rating in substitute selection?
A: MSL rating indicates the maximum time a component can be exposed to ambient conditions (typically 30°C, 85% relative humidity) before requiring baking to remove absorbed moisture. MSL 1 (Unlimited) indicates no moisture sensitivity restrictions, while MSL 3 (168 Hours) requires baking if the component has been exposed to ambient conditions for more than 168 hours. For long-term storage and supply chain flexibility, MSL 1 rated parts are preferred.
Q: Can the LM2902WDT be replaced with parts operating at lower maximum temperatures?
A: Substitution with parts operating at lower maximum temperatures (such as AS324 series at 85°C maximum) is acceptable only if the application circuit operates within the reduced temperature range. If the design requires operation up to 125°C, substitute parts must maintain this specification. The LM124 series from Texas Instruments and STMicroelectronics both support -55°C to 125°C operation, providing full temperature range compatibility.
Q: What supply voltage considerations apply when substituting the LM2902WDT?
A: The LM2902WDT specifies 3V to 32V supply voltage range. Most substitute parts (AS324 series) specify 3V to 36V, which provides extended maximum voltage capability. The LM124 series specifies 3V to 30V, which is compatible with the LM2902WDT specification. Circuits designed for the full 32V maximum should verify that substitute parts rated at 30V maximum are acceptable, or select AS324 series parts rated to 36V.
Q: Are there inventory availability differences between substitute options?
A: Inventory levels vary significantly among substitute options. AS324MTR-G1 shows 196,751 pieces in stock, AS324MTR-E1 shows 56,300 pieces, and LM124DR shows 171,766 pieces. These inventory levels indicate strong availability for active production parts. The original LM2902WDT shows 72,800 pieces in stock despite obsolete status, but this inventory is finite and subject to depletion.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts