Rohm Semiconductor LM2902FJ-E2
GROUND SENSE OPERATIONAL AMPLIFI
Full Technical Specifications
13 Parameters| Parameter / Attribute | Specification / Value |
|---|---|
| Mounting | Surface Mount |
| Amplifier type | General Purpose |
| Voltage - input offset | 1 mV |
| Voltage - supply span | 32 V |
| Current - supply | 1mA |
| Current - input bias | 20 nA |
| Current - output (Channel) | 30 mA |
| Operating temperature | -40°C~125°C |
| Gain bandwidth product | 800 kHz |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Slew rate | 0.3V/µs |
| Case | 14-SOIC (0.154\", 3.90mm Width) |
| Number of circuits | 4 |
Need Stock or a Drop-in Second-Source for LM2902FJ-E2?
Package: SOIC-14 / DIP-14 / TSSOP-14 · Pin-compatible replacements with immediate Shenzhen spot stock
The LM324 is the default quad op-amp of single-supply design: input common mode includes ground, output swings to near ground, and it runs from a 3V to 32V rail. It is one of the few analog parts in true continuous mass production across TI, ST, onsemi and every second-source fab, so availability is not the problem. The two real issues are picking the right grade for the rail (LM2902 caps at 26V, the B-suffix die at 36V, the LV family at 5.5V) and not treating the similarly-packaged LM339 quad comparator as a substitute - it is a different pinout and a different output stage.
Verified Pin-Compatible Replacements (4 verified alternatives)
Wide-Temperature Grade of the Same Amplifier
Shenzhen Spot Stock (24-48h Dispatch)
The LM324 die specified for the extended automotive/industrial temperature range (about -40 to +125 degC) with the supply capped at 26V instead of 32V.
3V to 26V single supply versus 3V to 32V on the LM324; same input and output swing behavior.
Current-Generation Die at Commodity Pricing
Shenzhen Spot Stock (24-48h Dispatch)
The B-suffix redesign: supply rating raised to 36V, lower supply current, improved ESD structure, same functional behavior and pinout.
3V to 36V; same common-mode and output swing characteristics of the family.
Modern Low-Voltage Family Member
Shenzhen Spot Stock (24-48h Dispatch)
A new 2.7V to 5.5V low-voltage design in the same 14-pin footprint - rail-to-rail output, far faster than the original, but a different silicon.
2.7V to 5.5V only - it will be destroyed on a 12V or 24V rail that the LM324 handled.
Same Die, Two Channels - Not a Same-Socket Part
Shenzhen Spot Stock (24-48h Dispatch)
The dual version of the same single-supply amplifier: identical electrical behavior per channel, in an 8-pin body.
3V to 32V (same family behavior); one output per channel less than the quad.
Buyer & Quality Checklist for Sourcing Alternatives
- Do not substitute the LM339 quad comparator for an LM324 (or the reverse): the 14-pin pinouts differ (on the LM324 the supply is V+ = pin 4 and GND = pin 11; on the LM339 V+ = pin 3 and GND = pin 12, with a different arrangement of inputs and outputs), the comparator output is open-collector and cannot source current, and a comparator is not internally compensated for unity-gain feedback.
- Match the grade to the rail: LM2902 is a 26V part, the LM324B die is 36V, and LM324LV is a 5.5V part. Cross-fitting grades is the most common way to kill an otherwise correct substitution.
- The family cannot pull its output all the way to the positive rail (about V+ minus 1.5V class) and shows crossover distortion when the output stage transitions while sinking current - fine for DC and control loops, a known compromise in audio paths.
- Inputs work at ground (common mode includes V-) but not near V+: keep sensor front ends within the documented input range or the output phase-inverts.
- When replacing a worn-out LM324 in a battery product with the LV family, check that every supply pin in the circuit is now on 5V - the LV part dies instantly on legacy 12V rails.
Frequently Asked Technical Questions
Q: What is the difference between LM358 and LM324?
A: Channel count and package: LM358 is the dual (SOIC-8 / DIP-8) and LM324 the quad (SOIC-14 / DIP-14) version of the same single-supply amplifier design. Electrically, one channel of each behaves the same way.
Q: Can I use an LM339 comparator instead of an LM324 op-amp?
A: No. Different pinout (supply on pin 3 versus pin 4), open-collector output that cannot source current, and no internal compensation for feedback operation. The two 14-pin chips look like cousins on a schematic and are not interchangeable.
Q: How do I choose between LM324, LM2902 and LM324B?
A: By rail and temperature: LM324 for 32V commercial use, LM2902 for wider temperature range at 26V, LM324B for new designs (36V, current die). LM324LV only for 3.3V / 5V designs built new.