Part A
LM2901D
National Semiconductor
- Lifecycle
- Active
- Stock
- 7764 PCS
- Package
- SOIC-14
- Series
- Linear - Comparatores
Replacement verdict
Compatible functional replacement candidate
The LM2901MX/NOPB is a functionally compatible replacement candidate for the LM2901D, sharing the same quad differential comparator architecture, SOIC-14 package footprint, and industrial temperature range. Both devices are drop-in interchangeable in most applications, with the LM2901MX/NOPB offering the added benefit of lead-free, RoHS-compliant construction. Designers should verify supply chain availability and confirm that the NOPB suffix aligns with their environmental compliance requirements before finalizing the substitution.
Comparator Type
High match
Package Type
High match
Operating Temperature
High match
Supply Voltage Range
High match
Parts at a glance
Part B
LM2901MX/NOPB
Texas Instruments
- Lifecycle
- Active
- Stock
- 6192 PCS
- Package
- SOIC-14
- Series
- Linear - Comparatores
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | LM2901D | LM2901MX/NOPB | Why it matters |
|---|---|---|---|
| Manufacturer | STMicroelectronics | Texas Instruments | Different manufacturers may have slightly different process controls, documentation, and quality systems, though the parts are functionally equivalent. |
| Comparator Type | General Purpose, Quad Differential | General Purpose, Quad Differential | Confirms both devices provide four independent voltage comparators in a single package for equivalent circuit function. |
| Number of Channels | 4 | 4 | Channel count must match for pin-to-pin and functional substitutability in multi-comparator designs. |
| Supply Voltage Range | 2 V to 36 V (or ±1 V to ±18 V) | 2 V to 36 V (or ±1 V to ±18 V) | Determines compatibility with the system power rail and ensures the comparator operates correctly across the intended voltage range. |
| Input Offset Voltage (Max) | ±7 mV (at 25°C) | ±7 mV (at 25°C) | Offset voltage affects threshold accuracy; matching values ensure comparable precision in sensing and detection circuits. |
| Input Bias Current (Typ) | 25 nA | 25 nA | Bias current influences input impedance loading and error in high-impedance sensor interfaces. |
| Response Time (Typ) | 1.3 µs | 1.3 µs | Propagation delay determines how fast the comparator reacts to input changes, critical for timing-sensitive applications. |
| Output Type | Open-Collector | Open-Collector | Open-collector outputs allow wired-OR logic and flexible pull-up voltage selection for level shifting. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Temperature range must cover the application environment to guarantee specified performance and reliability. |
| Package / Mounting | SOIC-14, Surface Mount | SOIC-14, Surface Mount | Identical package and mounting style ensure direct drop-in replacement on the same PCB footprint. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | LM2901D | LM2901MX/NOPB |
|---|---|---|
| Part Status | Obsolete | Active |
| Type | General Purpose | - |
| Number of Elements | 4 | - |
| Output Type | CMOS, DTL, ECL, MOS, Open-Collector, TTL | - |
| Voltage - Supply, Single/Dual (±) | 2V ~ 32V, ±1V ~ 16V | - |
| Voltage - Input Offset (Max) | 7mV @ 5V | - |
| Current - Input Bias(Max) | 0.25µA @ 5V | - |
| Current - Output (Typ) | 16mA @ 5V | - |
| Current - Quiescent (Max) | 2.5mA | - |
| Operating Temperature | -40°C ~ 125°C | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
What are the main differences between the LM2901D and the LM2901MX/NOPB?
The LM2901D is typically supplied in a SOIC-14 package by manufacturers such as Texas Instruments, STMicroelectronics, and ON Semiconductor, while the LM2901MX/NOPB is a Texas Instruments-specific orderable part number that denotes a SOIC-14 device with lead-free (Pb-free) NOPB designation and tape-and-reel packaging. Both are quad differential comparators with identical electrical functionality, but the LM2901MX/NOPB explicitly carries the Texas Instruments NOPB (no-lead, RoHS-compatible) suffix and is delivered in a tape-and-reel format for automated assembly.
Are the LM2901D and LM2901MX/NOPB electrically interchangeable?
Yes, both devices are quad differential comparators with the same functional pinout, supply voltage range (typically 2 V to 36 V or ±1 V to ±18 V), input common-mode range, and output configuration (open-collector). They can be used interchangeably in most designs, provided the package and environmental ratings of the specific manufacturer versions are acceptable for the application.
What is the significance of the NOPB suffix on the LM2901MX/NOPB?
NOPB stands for "No Lead (Pb)" and indicates that the device is manufactured with lead-free terminations and is compliant with RoHS and other lead-free requirements. The LM2901MX/NOPB is a Texas Instruments orderable part number that specifies a lead-free SOIC-14 package in tape-and-reel packaging.
Can the LM2901D and LM2901MX/NOPB be used in automotive or industrial applications?
Both devices are commonly specified for industrial temperature ranges, typically −40 °C to +125 °C, depending on the manufacturer. However, automotive-grade qualification (AEC-Q100) is not implied by the base part numbers; designers must verify the specific manufacturer's datasheet and any additional qualification suffixes before using either device in automotive or safety-critical applications.
What package and pin configuration do the LM2901D and LM2901MX/NOPB use?
Both are typically offered in a 14-pin SOIC (D) package with the standard quad comparator pinout: outputs on pins 1, 2, 13, and 14; inputs on pins 4–7 and 8–11; VCC on pin 3; and GND on pin 12. The LM2901MX/NOPB is the Texas Instruments tape-and-reel version of the SOIC-14 device, while the LM2901D may be supplied in tubes or other packaging depending on the manufacturer.
Do the LM2901D and LM2901MX/NOPB have the same output stage characteristics?
Yes, both use an open-collector output stage, which allows wired-OR connection and requires an external pull-up resistor. The output low voltage and output sink current specifications are essentially the same across manufacturers for the LM2901 family, though designers should confirm the exact limits in the specific manufacturer datasheet.
Which part number should be used for automated PCB assembly?
The LM2901MX/NOPB is specifically ordered in tape-and-reel packaging, making it suitable for automated pick-and-place assembly. The LM2901D may be supplied in tubes or trays depending on the manufacturer and distributor, so the LM2901MX/NOPB is generally preferred when tape-and-reel feeding is required.
Are there any differences in input offset voltage or bias current between the two parts?
No inherent electrical differences exist between the LM2901D and LM2901MX/NOPB when both are sourced from the same manufacturer and grade. Input offset voltage, input bias current, and response time are determined by the LM2901 die and are not changed by the package or NOPB suffix. Any variation would come from the specific manufacturer's datasheet limits, not from the part number suffix itself.