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Texas Instruments LM2901NSR
- Part No.:
- LM2901NSR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
LM2901NSR.pdf
- Description:
- IC COMPARATOR 4 DIFF 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:7,197
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Product details
Overview
LM2901NSR from Texas Instruments is a quad differential comparator IC designed for precision voltage comparison in single-supply systems. It features ±0.37 mV typical input offset voltage, 200 µA per comparator supply current, 1 µs response time, and operates from 2 V to 36 V. It is widely used in server PSU overvoltage protection circuits.
For engineers reviewing the LM2901NSR datasheet, LM2901NSR pinout, LM2901NSR application, or LM2901NSR equivalent, key selection criteria include its extended –40°C to +125°C temperature range, rail-to-rail input capability (down to ground), open-collector TTL/MOS/CMOS-compatible outputs, and B-version ESD robustness (2 kV HBM).
Technical Context
The LM2901NSR implements four independent comparators with internal ESD clamps, enabling operation across the full supply range (2–36 V) while maintaining low quiescent current independent of supply voltage. Its input stage supports common-mode voltages down to ground and up to VCC – 2 V, allowing direct sensing of signals referenced to ground or high-side rails.
Each comparator delivers fast propagation delay (1 µs typ), low output saturation voltage (≤400 mV at 4 mA sink), and high open-collector sink current (21 mA). The device uses standard bipolar process technology optimized for industrial reliability and wide-voltage compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V - supports wide-input industrial and server power rails without external regulation |
| Input Offset Voltage (max) | ±5.5 mV over –40°C to +125°C - enables accurate threshold detection in harsh thermal environments |
| Quiescent Current | 1.2 mA total (0.3 mA per comparator @ 5 V) - minimizes standby power in always-on monitoring circuits |
| Response Time | 1 µs (100 mV step, 5 mV overdrive) - suitable for fast fault detection in UPS and motor control |
| Input Bias Current (max) | 50 nA over temperature - preserves accuracy with high-impedance sensor interfaces (e.g., thermistors) |
| Output Sink Current | 21 mA - directly drives LEDs, MOSFET gates, or logic inputs without external buffers |
| ESD Rating (HBM) | 2000 V - meets industrial handling requirements without additional protection circuitry |
Pinout & Package
LM2901NSR is packaged in a 14-pin SOIC (NS package), body size 8.70 mm × 3.90 mm, with standard JEDEC MS-012AC footprint and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | Comparator 1 output | Open-collector output requiring external pull-up; sinks up to 21 mA |
| 2 (IN1–) | Comparator 1 inverting input | Differential input referenced to ground or other signal; accepts common-mode down to V– |
| 3 (IN1+) | Comparator 1 non-inverting input | Differential input with same voltage range as IN1–; both inputs tolerate up to VCC |
| 4 (VCC) | Positive supply | Single supply input (2–36 V); powers all four comparators and internal biasing |
| 5 (OUT2) | Comparator 2 output | Independent open-collector output; electrically isolated from OUT1 |
| 6 (IN2–) | Comparator 2 inverting input | Matches IN1– electrical behavior; no crosstalk between channels |
| 7 (IN2+) | Comparator 2 non-inverting input | Same input specification as IN1+; supports rail-to-rail common-mode operation |
| 8 (GND) | Negative supply / reference | Return path for supply and inputs; common reference for all four comparators |
| 9 (OUT3) | Comparator 3 output | Third independent open-collector output; identical sink capability and timing |
| 10 (IN3–) | Comparator 3 inverting input | Full input voltage range compliance; no degradation at temperature extremes |
| 11 (IN3+) | Comparator 3 non-inverting input | Supports differential sensing across full supply range without level-shifting |
| 12 (OUT4) | Comparator 4 output | Final open-collector output; enables 4-channel monitoring (e.g., multi-rail PSU) |
| 13 (IN4–) | Comparator 4 inverting input | Valid for inputs from GND to VCC; no damage if driven beyond VCC |
| 14 (IN4+) | Comparator 4 non-inverting input | Matches all other inputs; allows flexible configuration (window, zero-crossing, etc.) |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent comparators | Enables simultaneous monitoring of four distinct voltage thresholds in one compact SOIC-14 package |
| Rail-to-rail input common-mode range | Accepts inputs from GND to VCC – 2 V - eliminates need for level shifters in ground-referenced sensing |
| Low 0.37 mV typical input offset | Reduces false triggering in precision applications such as battery cell balancing or ADC reference supervision |
| 2 kV HBM ESD rating | Withstands industrial handling without external protection diodes, reducing BOM count and board area |
| 1 µs propagation delay | Supports real-time fault response in motor drives and UPS systems where latency must be <2 µs |
| 21 mA output sink capability | Directly interfaces with optocouplers, relay drivers, or logic families without external transistors |
Applications
| Server Power Supply Monitoring | Vacuum Robot Safety Interlock |
|---|---|
Use Scenario: Real-time monitoring of +12 V, +5 V, +3.3 V, and standby rails in redundant server PSUs to trigger shutdown on overvoltage or undervoltage. IC Role / Device Role / Timing Role: Quad comparator performing independent voltage window comparisons with sub-millisecond response. Use Value: Prevents catastrophic downstream damage by cutting power within 1 µs of fault detection, meeting IEC 62368-1 safety requirements. | Use Scenario: Verifying vacuum chamber pressure sensor output, emergency stop button state, motor encoder feedback, and thermal cutoff before motion initiation. IC Role / Device Role / Timing Role: Four-channel safety logic gate ensuring all four conditions are met prior to actuator enable. Use Value: Eliminates need for discrete logic or microcontroller polling, reducing SIL-2 certification effort and improving deterministic response. |
| Industrial Motor Drive Protection | Wireless Infrastructure Power Sequencing |
Use Scenario: Monitoring DC bus voltage, phase current sense, heatsink temperature, and gate driver supply in variable-frequency drives. IC Role / Device Role / Timing Role: Comparator-based analog fault detection feeding into hardware disable circuitry. Use Value: Provides fail-safe shutdown independent of MCU firmware, satisfying ISO 13849 PL e requirements. | Use Scenario: Controlling power-up sequence of RF transceiver, baseband processor, memory, and PA bias supplies in 5G small cells. IC Role / Device Role / Timing Role: Quad comparator implementing precise voltage-ramp sequencing with hysteresis. Use Value: Ensures strict power-order dependencies are met without software intervention, preventing latch-up during cold start. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2901DR | Same B-version specs, but in SOIC-14 (D package) - identical electrical performance and pinout | No difference; fully interchangeable in layout and function | Select LM2901DR only if D-package tape-and-reel or legacy footprint compatibility is required |
| LM339BDR | Same B-version architecture but rated for –40°C to +85°C (vs. LM2901B's –40°C to +125°C); otherwise identical offset, speed, and supply specs | Not suitable for under-hood automotive or high-temp industrial enclosures requiring >85°C ambient | Choose LM339BDR only for cost-sensitive commercial-grade applications where extended temperature is unnecessary |
Compared with LM2901DR and LM339BDR, the LM2901NSR offers guaranteed operation up to +125°C ambient - critical for enclosed server PSUs and factory automation controllers - while maintaining identical pinout, speed, and precision as the B-version family baseline.
Availability
LM2901NSR is available at Aetrix Electronics and suitable for server PSU monitoring, vacuum robot safety interlocks, industrial motor drive protection, wireless infrastructure power sequencing, and factory automation control requiring stable component supply and long-term industrial qualification.
Supply support for LM2901NSR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision analog, power management, and industrial interface solutions.
The LM2901B series - including LM2901NSR - was designed specifically for high-reliability industrial and computing applications demanding extended temperature operation, robust ESD immunity, and consistent parametric performance across voltage and thermal extremes.
FAQ
What is the maximum supply voltage rating for LM2901NSR?
The LM2901NSR has an absolute maximum supply voltage rating of 38 V, with recommended operating range from 2 V to 36 V. This allows direct use in 24 V industrial systems and 36 V telecom power rails without external regulators. Operation above 36 V is not recommended for sustained use, as specified in TI's SLCS006Z datasheet Section 6.1.
Does LM2901NSR support rail-to-rail input operation?
Yes, LM2901NSR supports rail-to-rail input common-mode voltage from ground (V–) up to VCC – 2 V. Either input can exceed VCC without damage, and proper output states are maintained as long as at least one input remains within the valid common-mode range. This is confirmed in Section 6.7 and 6.8 of the LM2901B datasheet.
What is the typical input offset voltage of LM2901NSR and how does it vary with temperature?
The LM2901NSR has a typical input offset voltage of ±0.37 mV at 25°C, with a maximum of ±5.5 mV over its full operating range of –40°C to +125°C. Figure 6-8 and 6-14 in the datasheet confirm stable offset performance across temperature and supply voltage, making it suitable for precision threshold detection in thermally demanding environments.
Can LM2901NSR outputs directly drive a MOSFET gate?
Yes, each LM2901NSR output can sink up to 21 mA (typical), sufficient to charge/discharge typical MOSFET gate capacitance (e.g., 1–2 nF) in <1 µs. Its open-collector structure requires an external pull-up resistor; for 12 V gate drive, a 10 kΩ pull-up yields ~1.2 mA static current and fast switching. This capability is validated in TI's application note SLVA722.
Is LM2901NSR pin-compatible with legacy LM2901 variants?
Yes, LM2901NSR is a drop-in replacement for LM2901, LM2901A, and LM2901V in SOIC-14 (NS) package. It maintains identical pinout, electrical interface, and footprint, while improving offset voltage, ESD rating (2 kV HBM), and temperature range (–40°C to +125°C). No PCB changes are required when upgrading from non-B versions.
LM2901NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 4
- Output Type:
- Open-Collector
- Voltage - Supply, Single/Dual (±):
- 2V ~ 30V, ±1V ~ 15V
- :
- 7mV @ 30V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 2.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-SO
LM2901NSR FAQ
1.How can I place an order for LM2901NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2901NSR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2901NSR reliable?
The price and inventory of LM2901NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2901NSR is usually 5 days.
3.What payment methods are accepted for LM2901NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2901NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2901NSR?
LM2901NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2901NSR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2901NSR?
For technical support, including LM2901NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2901NSR requirements.
6.How does Aetrix verify that LM2901NSR is sourced from the original manufacturer or authorized distributors?
All LM2901NSR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2901NSR meets industry standards.
7.What is the process for return or replacement of LM2901NSR?
All LM2901NSR units undergo pre-shipment inspection (PSI). If there is an issue with LM2901NSR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2901NSR part is unused and in its original packaging.
Return procedure for LM2901NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2901NSR Tags
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