Part A
LM2902M
Texas Instruments
- Lifecycle
- Active
- Stock
- 1598 PCS
- Series
- Linear - Amplifiers - Instrumentation, Op Amps, Buffer Amps
Replacement verdict
Not a drop-in replacement
The LM2902M and LM2901DR are not functionally interchangeable. Although both are quad operational amplifier/comparator devices in SOIC-14 packages with similar supply voltage ranges, they differ fundamentally in output stage topology, input common-mode behavior, and application intent. The LM2902M is a general-purpose quad op-amp with a push-pull output stage, while the LM2901DR is a quad differential comparator with an open-collector output requiring an external pull-up resistor. Direct substitution without circuit redesign is not recommended.
Different output type
Different device function
External pull-up may be required
Different input common-mode range
Parts at a glance
Part B
LM2901DR
ROM
- Lifecycle
- Active
- Stock
- 3768 PCS
- Package
- SOIC-14
- Series
- Comparateur linéaire
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | LM2902M | LM2901DR | Why it matters |
|---|---|---|---|
| Amplifier Type | Operational Amplifier (Op-Amp) | Comparator | These are fundamentally different functional blocks; an op-amp is designed for linear amplification with negative feedback, while a comparator is designed for open-loop digital switching decisions. |
| Number of Channels | 4 | 4 | Both are quad devices, so channel count is not a differentiator, but it confirms comparable package pin usage for multi-channel designs. |
| Output Type | Push-Pull (Linear) | Open-Collector | Open-collector outputs require an external pull-up resistor and allow wired-OR logic, whereas push-pull outputs drive both high and low directly, affecting interface circuitry. |
| Input Offset Voltage (Max) | 7 mV | 7 mV | Offset voltage determines accuracy at the input; identical max values indicate similar precision limits for threshold detection or signal conditioning. |
| Input Bias Current (Typ) | 20 nA | 25 nA | Bias current affects input impedance loading and error in high-impedance sensor interfaces; lower is generally better for precision applications. |
| Supply Voltage Range | 3 V to 32 V | 2 V to 36 V | The usable supply range determines compatibility with system rails; the comparator supports a slightly wider range and lower minimum voltage. |
| Supply Current per Channel (Typ) | 0.7 mA | 0.8 mA | Quiescent current impacts power budget in battery-powered or energy-sensitive designs; both are low but not identical. |
| Response Time / Slew Rate | 0.3 V/µs (slew rate) | 1.3 µs (response time) | Speed metrics differ by function: op-amp slew rate limits large-signal linear response, while comparator response time limits switching speed for digital decisions. |
| Operating Temperature Range | -40°C to 125°C | -40°C to 125°C | Both are rated for industrial/automotive temperature ranges, so environmental robustness is equivalent for harsh environments. |
| Package | SOIC-14 | SOIC-14 | Identical package and pin count simplify PCB layout and potential footprint reuse, though pin functions differ between op-amp and comparator. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | LM2902M | LM2901DR |
|---|---|---|
| Part Status | Obsolete | Obsolete |
| Type | - | General Purpose |
| Number of Elements | - | 4 |
| Output Type | - | CMOS, MOS, Open-Collector, TTL |
| Voltage - Supply, Single/Dual (±) | - | 2V ~ 36V, ±1V ~ 18V |
| Voltage - Input Offset (Max) | - | 7mV @ 5V |
| Current - Input Bias(Max) | - | 0.25µA @ 5V |
| Current - Output (Typ) | - | 16nA @ 5V |
| Current - Quiescent (Max) | - | 2mA |
| Operating Temperature | -40°C ~ 85°C (TJ) | -40°C ~ 125°C |
| Mounting Type | Surface Mount | Surface Mount |
| Series | LinCMOS™ | - |
| Base Product Number | LM2902 | - |
| Amplifier Type | Standard (General Purpose) | - |
| Number of Circuits | 4 | - |
| Gain Bandwidth Product | 1 MHz | - |
| Current - Input Bias | 45 nA | - |
| Voltage - Input Offset | 2 mV | - |
| Supply Current | 1.5mA | - |
| Current - Output / Channel | 40 mA | - |
| Voltage - Supply Span (Min) | 3 V | - |
| Voltage - Supply Span (Max) | 32 V | - |
| Packaging | Tube | - |
Frequently asked questions
What are the main functional differences between the LM2902M and the LM2901DR?
The LM2902M is a quad operational amplifier designed for linear signal amplification and processing, while the LM2901DR is a quad differential comparator designed to compare two voltages and output a digital logic signal. They are not functionally interchangeable despite both being quad devices in similar packages.
Are the LM2902M and LM2901DR pin-compatible?
Both devices are typically offered in 14-pin SOIC packages with the same pinout arrangement (four channels, with power pins on pins 4 and 11). However, pin compatibility does not imply functional equivalence; the internal circuitry and output stages differ significantly between an op-amp and a comparator.
Can the LM2902M be used as a comparator in place of the LM2901DR?
An operational amplifier such as the LM2902M can function as a comparator in non-critical, slow-switching applications, but it is not recommended as a direct substitute for the LM2901DR. The LM2901DR is specifically designed with faster response times, defined output logic levels, and hysteresis capability for comparator applications.
What are the supply voltage ranges for the LM2902M and LM2901DR?
Both the LM2902M and LM2901DR are specified for a wide supply voltage range, typically from 3 V to 26 V (or ±1.5 V to ±13 V for split supplies), with an absolute maximum of 26 V or ±13 V. These ratings are consistent across the LM2902 and LM2901 families from major manufacturers.
What is the output configuration of each device?
The LM2902M operational amplifier features a push-pull output stage capable of sourcing and sinking current. The LM2901DR comparator has an open-collector output, which requires an external pull-up resistor and allows wired-OR logic connections.
Which device is better suited for battery-powered applications?
Both devices feature low supply current, making them suitable for battery-powered designs. The LM2902M typically draws around 0.7 mA per amplifier, while the LM2901DR draws approximately 0.8 mA per comparator. The choice depends on whether amplification or comparison is required, not on a significant difference in power consumption.
Are the LM2902M and LM2901DR available in the same package options?
Both devices are commonly available in 14-pin SOIC packages. The LM2902M is typically offered in SOIC-14, while the LM2901DR is also offered in SOIC-14. Package options may vary by manufacturer, so the specific datasheet should be consulted for exact availability.
What are the input offset voltage specifications for these devices?
The LM2902M operational amplifier typically has an input offset voltage of approximately 2 mV to 7 mV over temperature. The LM2901DR comparator typically has an input offset voltage of approximately 2 mV to 9 mV over temperature. These values are consistent with the standard LM2902 and LM2901 specifications.