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STMicroelectronics LM2903HD
- Part No.:
- LM2903HD
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2903HD.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,289
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Product details
Overview
LM2903HD from STMicroelectronics is a dual low-power voltage comparator IC operating from single supply (2V–36V) or split supplies (±1V–±18V), featuring input common-mode range including ground, 25nA typical input bias current, 250mV typical output saturation voltage at 4mA sink, and −40°C to +150°C operating temperature. It serves as a robust level-detection and window-comparison element in automotive powertrain control modules.
For engineers reviewing the LM2903HD datasheet, LM2903HD pinout, LM2903HD application, or LM2903HD equivalent, key selection considerations include its rail-to-rail input capability with ground-referenced operation, TTL/CMOS-compatible open-collector outputs, wide supply flexibility, and AEC-Q100-qualified high-temperature performance for under-hood sensing circuits.
Technical Context
The LM2903HD implements two independent PNP-input comparators with internal biasing optimized for stable operation across extreme temperature ranges. Its input stage allows common-mode voltages down to −0.3V (relative to VCC−) and up to VCC+ −1.5V, enabling direct ground-referenced signal comparison without level-shifting circuitry.
Output stages are open-collector NPN transistors capable of sinking ≥6mA while maintaining ≤400mV saturation voltage over full temperature range. Response time is 1.3µs (small-signal, 100mV step, 5mV overdrive) and 500ns (large-signal, TTL-compatible transition), supporting fast threshold detection in engine control timing loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single: +2V to +36V; Dual: ±1V to ±18V - enables direct battery-supplied operation in 12V/24V automotive systems without regulation |
| Input Offset Voltage | 1 mV (min), 7 mV (typ), 15 mV (max) - supports accurate threshold detection within ±10mV windows without trimming |
| Input Bias Current | 25 nA (typ), 400 nA (max) - minimizes loading on high-impedance sensor bridges and resistive dividers |
| Output Sink Current | 6 mA (min), 16 mA (max) at VO ≤ 400 mV - drives standard LED indicators or logic-level MOSFET gates directly |
| Operating Temperature | −40°C to +150°C - qualified for engine compartment mounting per AEC-Q100 Grade 0 requirements |
| Response Time | 1.3 µs (small-signal), 500 ns (large-signal) - meets timing-critical crankshaft position decoding and fault-latch response |
| Input Common-Mode Range | Includes ground (0V) with single supply - eliminates need for negative rail or level-shifters in ground-referenced sensor interfaces |
Pinout & Package
LM2903HD is housed in an SO-8 (Small Outline, 150mil width) plastic micropackage with gull-wing leads, compliant with JEDEC MS-012 and RoHS. Package dimensions: 4.9mm × 3.9mm × 1.75mm (L × W × H), pitch = 1.27mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Comparator 1) | Accepts reference or sensed signal for first comparator; compatible with ground-referenced inputs |
| 2 | Non-Inverting Input (Comparator 1) | Accepts variable signal (e.g., throttle position sensor output); supports common-mode down to −0.3V |
| 3 | Output (Comparator 1) | Open-collector NPN output; requires external pull-up to VCC or logic rail; sinks up to 16mA |
| 4 | GND | Power and signal reference ground; shared return for both comparators and load circuits |
| 5 | Non-Inverting Input (Comparator 2) | Second independent input channel; identical electrical specs to Pin 2 |
| 6 | Inverting Input (Comparator 2) | Second independent input channel; identical electrical specs to Pin 1 |
| 7 | Output (Comparator 2) | Independent open-collector output; electrically isolated from Output 1; supports dual-threshold latching |
| 8 | VCC+ | Positive supply pin; accepts 2V–36V single supply or positive rail of dual supply; decoupling recommended |
Key Features
| Feature | Design Value |
|---|---|
| Ground-sensing input stage | Input common-mode range includes 0V with single supply - enables direct interface to thermistors, potentiometers, and Hall sensors referenced to chassis ground |
| Low quiescent current | 0.4 mA (typ) at 5V, independent of supply voltage - reduces standby power in always-on vehicle modules |
| Wide supply tolerance | Operates from 2V to 36V single supply - accommodates cold-crank (6V) to load-dump (40V transient) conditions without external regulators |
| High-temperature reliability | Specified from −40°C to +150°C - validated for continuous operation in transmission control units and turbocharger actuators |
| TTL/CMOS-compatible output | Open-collector output with 16mA sink capability - interfaces directly with microcontroller GPIOs, optocouplers, and relay drivers |
Applications
| Engine Coolant Temperature Monitoring | Fuel Pump Overcurrent Detection |
|---|---|
Use Scenario: Detect coolant temperature crossing 105°C threshold using NTC thermistor divider network. IC Role / Device Role / Timing Role: Comparator 1 compares thermistor voltage against fixed reference; Comparator 2 monitors secondary safety threshold at 120°C. Use Value: Ground-referenced inputs eliminate level-shifter; 150°C rating ensures reliability near radiator core. | Use Scenario: Monitor fuel pump motor current via shunt resistor; trigger shutdown if >15A sustained. IC Role / Device Role / Timing Role: Comparator 1 detects overcurrent; Comparator 2 provides hysteresis-based latch to prevent chatter during transient surges. Use Value: 6mA minimum sink current drives MOSFET gate directly; 1.3µs response captures fast fault events. |
| Brake Light Activation Logic | Transmission Solenoid Enable Control |
Use Scenario: Activate brake lights when brake switch closes and vehicle speed >5km/h (to prevent false triggers at standstill). IC Role / Device Role / Timing Role: Comparator 1 reads brake switch; Comparator 2 reads speed sensor pulse width; AND logic formed externally. Use Value: Dual comparators on one die reduce PCB area and BOM count; SO-8 package fits tight under-dash space. | Use Scenario: Enable solenoid only when line pressure exceeds 200kPa and transmission is in D/R gear (via gear position switch). IC Role / Device Role / Timing Role: Comparator 1 validates pressure transducer output; Comparator 2 validates gear switch logic level. Use Value: Input offset <15mV ensures accurate 200kPa threshold detection across temperature; 150°C rating matches solenoid proximity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-power comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2903DT | Same die, SO-8 package but rated −40°C to +125°C; lower max junction temperature | Not qualified for under-hood locations exceeding 125°C ambient (e.g., near exhaust manifolds) | Select when cost sensitivity outweighs extended temperature requirement |
| TLV3702IDR | Rail-to-rail input/output; 1.8V–16V supply; 350nA supply current; 350mV output saturation at 1mA | Lower voltage range limits use in 24V commercial vehicles; superior precision but reduced ruggedness | Select for battery-powered ADAS sensors requiring ultra-low power and rail-to-rail swing |
Compared with LM2903DT and TLV3702IDR, the LM2903HD uniquely combines AEC-Q100 Grade 0 temperature capability, ground-sensing input, and 36V tolerance-making it the only choice for primary engine-control comparators where thermal margin and supply robustness are non-negotiable.
Availability
LM2903HD is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and battery management systems requiring stable component supply under high-temperature, high-voltage automotive conditions.
Supply support for LM2903HD 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power discrete technologies with vertical manufacturing and AEC-Q100 qualification infrastructure.
The LM2903H series belongs to ST's high-reliability analog comparator product line, engineered specifically for automotive powertrain and chassis systems demanding extended temperature operation and supply resilience.
FAQ
Can LM2903HD operate with a 3.3V supply?
Yes, LM2903HD operates down to +2V supply, making it fully compatible with 3.3V systems. At 3.3V, input common-mode range extends from 0V to 1.8V, output sink current remains ≥6mA, and propagation delay increases to ~1.8µs - verified per ST's Electrical Characteristics table at VCC+ = 3.3V, Tamb = 25°C.
Does LM2903HD require external pull-up resistors on its outputs?
Yes, both outputs are open-collector NPN transistors and require external pull-up resistors to VCC or another logic rail. Typical values range from 2.2kΩ (for 5V TTL loads) to 10kΩ (for low-power CMOS inputs); pull-up voltage must not exceed absolute maximum VI = +36V.
Is LM2903HD pin-compatible with legacy LM2903 variants?
Yes, LM2903HD uses the standard SO-8 pinout defined in JEDEC MS-012 and matches LM2903D, LM2903DT, and LM2903DR. All share identical pin functions, mechanical footprint, and thermal pad layout - enabling drop-in replacement where temperature and supply requirements align.
What is the maximum differential input voltage the LM2903HD can withstand?
The absolute maximum differential input voltage is ±36V, per ST's Absolute Maximum Ratings table. This allows safe operation even when one input is at VCC+ and the other at GND (e.g., 36V differential), provided common-mode limits are respected and no input falls below −0.3V relative to VCC−.
LM2903HD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- Open-Collector, Rail-to-Rail
- Voltage - Supply, Single/Dual (±):
- 2V ~ 36V, ±1V ~ 18V
- :
- 7mV @ 30V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 16mA @ 5V
- Current - Output (Typ):
- 2.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 150°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
LM2903HD FAQ
1.How can I place an order for LM2903HD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2903HD 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 LM2903HD reliable?
The price and inventory of LM2903HD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903HD is usually 5 days.
3.What payment methods are accepted for LM2903HD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2903HD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2903HD?
LM2903HD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2903HD 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 LM2903HD?
For technical support, including LM2903HD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903HD requirements.
6.How does Aetrix verify that LM2903HD is sourced from the original manufacturer or authorized distributors?
All LM2903HD 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 LM2903HD meets industry standards.
7.What is the process for return or replacement of LM2903HD?
All LM2903HD units undergo pre-shipment inspection (PSI). If there is an issue with LM2903HD, 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 LM2903HD part is unused and in its original packaging.
Return procedure for LM2903HD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2903HD Tags
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