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LM2902VN Equivalent & Substitute Parts
Part Overview
The LM2902VN 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, necessitating identification of equivalent and substitute components for ongoing design requirements and production continuity. The LM2902VN operates across a wide supply voltage range of 3V to 32V with an operating temperature range of -40°C to 125°C, making it suitable for diverse industrial and consumer applications requiring general-purpose amplification.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer Part Number | LM2902VN | — |
| Manufacturer | onsemi | — |
| 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 Range | -40 to 125 | °C |
| Package / Case | 14-DIP (0.300", 7.62mm) | — |
| Mounting Type | Through Hole | — |
| Product Status | Obsolete | — |
| RoHS Status | RoHS non-compliant | — |
Substitute Part Grouping Explanation
Substitution of the LM2902VN is determined by the following critical parameters:
Primary Substitution Criteria:
- Number of circuits: 4 independent amplifier channels
- Amplifier type: General-purpose operational amplifier
- Package compatibility: 14-pin DIP form factor for through-hole mounting
- Supply voltage range: Minimum 3V to maximum 32V
- Operating temperature range: Extended industrial range (-40°C to 125°C preferred)
- Output current capability: 40 mA per channel
- Input bias current: Acceptable range up to 90 nA
- Voltage input offset: 2 mV nominal
Substitution Logic: Substitute parts are grouped into two categories based on mounting technology:
-
Through-Hole DIP Substitutes (Direct package replacement): Parts maintaining the 14-DIP package format enable direct board-level replacement without layout modification. These include KA324A, LM224AN, and LM224KAN.
-
Surface-Mount SOIC Substitutes (Functional equivalents requiring layout redesign): Parts in 14-SOIC packages provide electrical equivalence but require PCB redesign and different assembly processes. These include LM124DG4, LM224D, LM224DT, LM224AD, and LM224KAD.
-
Specialized Amplifier Types (Enhanced performance alternatives): The LF444ACN/NOPB represents a J-FET input variant offering superior input bias current characteristics but with different electrical specifications and supply voltage requirements.
Parameter Comparison
| Part Number | Manufacturer | Amplifier Type | Number of Circuits | Gain Bandwidth Product (MHz) | Input Bias Current (nA) | Input Offset Voltage (mV) | Output Current / Channel (mA) | Supply Voltage Min (V) | Supply Voltage Max (V) | Operating Temperature (°C) | Package | Mounting Type | Product Status |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| LM2902VN | onsemi | General Purpose | 4 | 1.0 | 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 |
| LF444ACN/NOPB | Texas Instruments | J-FET | 4 | 1.0 | 10 | 2 | 14 | 44 | 44 | 0 to 70 | 14-DIP | Through Hole | Active |
| LM124DG4 | Texas Instruments | General Purpose | 4 | 1.2 | 20 | 3 | 30 | 3 | 30 | -55 to 125 | 14-SOIC | Surface Mount | Last Time Buy |
| 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 |
| LM224DT | STMicroelectronics | General Purpose | 4 | 1.3 | 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 |
| LM224KADR | Texas Instruments | General Purpose | 4 | 1.2 | 15 | 2 | 30 | 3 | 30 | -25 to 85 | 14-SOIC | Surface Mount | Active |
| LM224KAN | Texas Instruments | General Purpose | 4 | 1.2 | 15 | 2 | 30 | 3 | 30 | -25 to 85 | 14-DIP | Through Hole | Active |
Engineering Selection Recommendations
For Direct Through-Hole Package Replacement:
The KA324A (Fairchild Semiconductor) provides the most direct substitution for the LM2902VN. Both devices maintain the 14-DIP through-hole package format, enabling board-level replacement without layout modification. The KA324A demonstrates superior input bias current performance (40 nA versus 90 nA) and lower input offset voltage (1.5 mV versus 2 mV). However, the KA324A operates within a reduced temperature range (0°C to 70°C) compared to the LM2902VN (-40°C to 125°C), limiting applicability in extended industrial temperature environments. The KA324A is currently in active production status with 1,300 units in stock.
The LM224KAN (Texas Instruments) offers an alternative through-hole DIP substitute with active product status. This device maintains full compatibility with the 14-DIP package and provides improved input bias current (15 nA). The LM224KAN operates within a narrower temperature range (-25°C to 85°C) and reduced maximum supply voltage (30V versus 32V), which may restrict use in certain high-voltage applications. The LM224KAN is currently in active production with 1,425 units available.
For Surface-Mount Applications Requiring Redesign:
The LM224DT (STMicroelectronics) represents the optimal surface-mount substitute, offering active product status with the highest inventory availability (35,200 units). This device maintains the 14-SOIC package format and delivers output current capability matching the original specification (40 mA per channel). The LM224DT operates across the temperature range -40°C to 105°C, providing extended low-temperature performance suitable for industrial applications. Supply voltage range is limited to 3V to 30V.
The LM224D (STMicroelectronics) provides an alternative surface-mount option with active status and 4,495 units in stock. Electrical specifications are equivalent to the LM224DT with identical temperature and supply voltage ranges.
For Extended Temperature Range Requirements:
The LM124DG4 (Texas Instruments) is the only substitute maintaining the extended temperature range (-55°C to 125°C) matching industrial specifications. This device is available in 14-SOIC surface-mount package with 3,300 units in stock. The LM124DG4 is designated as Last Time Buy, indicating limited future availability. Supply voltage is restricted to 3V to 30V, and output current per channel is reduced to 30 mA.
For Specialized High-Input-Impedance Applications:
The LF444ACN/NOPB (Texas Instruments) provides a J-FET input variant with exceptional input bias current performance (10 pA). This device is suitable for applications requiring minimal input loading. However, the LF444ACN/NOPB operates exclusively at ±22V supply voltage (44V total span), incompatible with the LM2902VN's 3V to 32V range. This device is available in 14-DIP through-hole package with 2,200 units in stock and active product status.
Compliance Considerations:
The LM2902VN is RoHS non-compliant. All substitute parts listed (KA324A, LF444ACN/NOPB, LM124DG4, LM224AD, LM224AN, LM224D, LM224DT, LM224KAD, LM224KADR, LM224KAN) are ROHS3 compliant, enabling transition to environmentally compliant designs. All parts maintain REACH Unaffected status and EAR99 export classification.
Frequently Asked Questions (FAQ)
Q: Can the KA324A directly replace the LM2902VN on existing PCBs?
A: Yes, the KA324A maintains identical 14-DIP through-hole package dimensions (0.300", 7.62mm pitch) and pinout compatibility, enabling direct board-level substitution without layout modification. However, verify that your application operates within the KA324A's temperature range (0°C to 70°C) and does not require the extended low-temperature performance of the LM2902VN (-40°C minimum).
Q: What is the primary limitation of surface-mount substitutes like LM224DT?
A: Surface-mount substitutes in 14-SOIC packages require complete PCB redesign and different assembly processes compared to through-hole DIP packages. While electrical performance is equivalent or superior, implementation requires engineering layout changes and manufacturing process modifications. Surface-mount options are suitable only for new designs or major PCB revisions.
Q: Why does the LF444ACN/NOPB have different supply voltage requirements?
A: The LF444ACN/NOPB is a J-FET input operational amplifier with fundamentally different internal architecture compared to the general-purpose bipolar input LM2902VN. J-FET designs require symmetric ±22V supply voltages (44V total span) for proper biasing and operation. This device is not suitable for applications designed around the LM2902VN's 3V to 32V single or dual supply range.
Q: Which substitute offers the best inventory availability?
A: The LM224DT (STMicroelectronics) provides the highest inventory availability with 35,200 units in stock. This surface-mount device is actively produced and offers electrical specifications closely matching the LM2902VN with the added benefit of ROHS3 compliance.
Q: Is the LM224KAN suitable for extended temperature industrial applications?
A: The LM224KAN operates within the temperature range -25°C to 85°C, which is narrower than the LM2902VN's -40°C to 125°C range. For applications requiring operation below -25°C or above 85°C, the LM224KAN is not suitable. The LM124DG4 is the only substitute maintaining extended temperature performance (-55°C to 125°C).
Q: What are the key electrical differences between the LM2902VN and LM224DT?
A: The LM224DT offers improved input bias current (20 nA versus 90 nA) and maintains equivalent input offset voltage (2 mV). Output current capability is identical (40 mA per channel). The primary trade-off is reduced maximum supply voltage (30V versus 32V) and narrower operating temperature range (-40°C to 105°C versus -40°C to 125°C). Gain bandwidth product is slightly higher (1.2 MHz versus 1.0 MHz).
Q: Can I use the LM224AN as a through-hole substitute?
A: The LM224AN maintains the 14-DIP through-hole package and is electrically compatible with the LM2902VN. However, the LM224AN is classified as obsolete with no active production. While 7,305 units are currently in stock, future availability is not guaranteed. The KA324A or LM224KAN are preferred alternatives with active product status.
Q: What is the significance of "Last Time Buy" status for the LM124DG4?
A: Last Time Buy designation indicates that the manufacturer has announced end-of-life production. Existing inventory will be sold until depletion, after which the part becomes unavailable. The LM124DG4 should be considered only for applications where no other substitute meets requirements, as long-term supply cannot be assured.
Q: Are all substitute parts REACH compliant?
A: Yes, all substitute parts listed maintain REACH Unaffected status, identical to the LM2902VN. This designation indicates that the substances of concern regulated under REACH are not present in these components.
Q: Which substitute offers the lowest input bias current?
A: The LF444ACN/NOPB provides the lowest input bias current at 10 pA, compared to 90 nA for the LM2902VN. However, this superior performance is accompanied by different supply voltage requirements (±22V only) and reduced output current capability (14 mA per channel). The LF444ACN/NOPB is suitable only for high-impedance input applications where these trade-offs are acceptable.
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