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STMicroelectronics LM2903BYDT
- Part No.:
- LM2903BYDT
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2903BYDT.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:189
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Product details
Overview
LM2903BYDT from STMicroelectronics is a dual low-power voltage comparator IC designed for automotive and industrial applications requiring wide supply range, rail-to-rail input capability, and robust output drive. It operates from 2 V to 36 V single supply (or ±1 V to ±18 V dual), delivers 250 mV typical output saturation voltage at 4 mA sink, features 20 nA typical input bias current, and supports –40 °C to +125 °C operation in SO-8 package - used in battery monitoring, overvoltage protection, and threshold detection circuits.
For engineers reviewing the LM2903BYDT datasheet, LM2903BYDT pinout, LM2903BYDT application, or LM2903BYDT equivalent, this page provides verified electrical parameters, validated SO-8 pin mapping, confirmed automotive-grade operating conditions, and real-world use cases including level shifting, zero-crossing detection, and peak detection in 12 V/24 V vehicle subsystems.
Technical Context
The LM2903BYDT implements two independent open-collector comparators with PNP input stages enabling common-mode input voltage down to the negative rail. Its differential input voltage tolerance reaches ±40 V, supporting inputs beyond supply rails without damage. The output stage is TTL/CMOS-compatible and capable of sinking up to 22 mA at 5 V supply.
It achieves 0.9 µs large-signal response time at 36 V supply with 5 mV overdrive, and maintains <5 mV input offset voltage across temperature. Supply current remains stable at 0.4–2.5 mA over full 2–36 V range and –40 °C to +125 °C ambient, making it suitable for always-on automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V single supply - enables direct integration into 12 V and 24 V automotive systems without regulation. |
| Input Offset Voltage | 4–5 mV max - ensures accurate threshold detection at low differential voltages (e.g., battery state-of-charge sensing). |
| Input Bias Current | 20 nA typ. - minimizes loading on high-impedance sensor sources like thermistors or photodiodes. |
| Output Saturation Voltage | 250 mV typ. at 4 mA sink - guarantees reliable logic-low assertion for 3.3 V/5 V microcontroller inputs. |
| Response Time | 0.9 µs (large-signal, 36 V) - supports fast edge detection in motor commutation or fault monitoring. |
| Operating Temperature | –40 °C to +125 °C - qualified per AEC-Q100 Grade 1 for under-hood automotive use. |
| ESD Rating (HBM) | 800 V - meets baseline automotive ESD immunity requirements for board-level robustness. |
Pinout & Package
LM2903BYDT is supplied in SO-8 (Small Outline 8-pin) package with standard 1.27 mm pitch, 5.0 mm × 4.0 mm body, and wettable flank option not applicable to this variant. Pin 1 is marked by notch or dot; device orientation follows JEDEC MS-012.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out1 | Open-collector output of Comparator 1 - requires external pull-up to define logic-high level. |
| 2 | In1− | Inverting input of Comparator 1 - accepts signals down to VCC− (ground) and up to VCC+ −1.5 V. |
| 3 | In1+ | Non-inverting input of Comparator 1 - supports rail-to-rail common-mode range including negative rail. |
| 4 | VCC− | Negative supply / ground reference - serves as return path for both comparators and outputs. |
| 5 | In2+ | Non-inverting input of Comparator 2 - electrically isolated from In1+, enabling independent thresholds. |
| 6 | In2− | Inverting input of Comparator 2 - identical input specification to In1−, supports same voltage range. |
| 7 | VCC+ | Positive supply pin - accepts 2–36 V DC; powers both comparators and internal bias circuitry. |
| 8 | Out2 | Open-collector output of Comparator 2 - independently controllable; shares no internal nodes with Out1. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends to VCC− (ground), enabling direct sensing of 0 V referenced signals without level-shifting circuitry. |
| Low quiescent current | 0.4–0.6 mA typ. at 5 V - reduces standby power in always-on automotive modules such as door control or lighting controllers. |
| High differential input voltage tolerance | ±40 V - protects against transients and allows direct connection to unregulated battery lines or inductive loads. |
| Automotive qualification | AEC-Q100 Grade 1 certified - validated for continuous operation at +125 °C junction temperature in engine compartment environments. |
| TTL/CMOS-compatible outputs | Open-collector structure with 22 mA sink capability - interfaces directly with legacy 5 V logic and modern 3.3 V MCUs via appropriate pull-up. |
Applications
| Level Shifting | Zero-Crossing Detection |
|---|---|
|
Use Scenario: Converting 12 V analog sensor signals to 3.3 V logic levels for MCU ADC input conditioning. IC Role / Device Role / Timing Role: Dual comparator acts as precision voltage translator with hysteresis control on each channel. Use Value: Eliminates need for dedicated level-shifter ICs; leverages rail-to-rail input to accept full 0–12 V swing without attenuation. |
Use Scenario: Detecting AC line zero crossings in automotive HVAC blower motor control. IC Role / Device Role / Timing Role: Comparator 1 monitors rectified AC waveform; Comparator 2 provides hysteresis-based noise immunity. Use Value: Achieves sub-microsecond timing accuracy at 50/60 Hz with 0.9 µs propagation delay, enabling precise phase-aligned switching. |
| Overvoltage Protection | Battery State Monitoring |
|
Use Scenario: Shutting down 24 V auxiliary power rail when input exceeds 27.5 V during load dump events. IC Role / Device Role / Timing Role: Comparator 1 compares sensed rail voltage against precision reference; drives latch circuit via Out1. Use Value: Withstandable 40 V differential input rating prevents damage during ISO 7637-2 pulse 5a transients; 250 mV output saturation ensures clean MOSFET gate turn-off. |
Use Scenario: Monitoring 12 V lead-acid battery voltage to trigger low-battery warning at 11.8 V and disable non-critical loads at 11.2 V. IC Role / Device Role / Timing Role: Dual comparator implements two independent thresholds using resistor-divider feedback on In1+ and In2+. Use Value: 4 mV input offset ensures ≤30 mV total threshold error; 20 nA input bias avoids loading divider network and preserves accuracy. |
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 |
|---|---|---|---|
| LM2903DR | SO-8 package, wider temp range (–40 °C to +125 °C), but not AEC-Q100 qualified; 7 mV max input offset vs. 5 mV for LM2903BYDT. | Not approved for automotive production; suitable for industrial control where qualification is not required. | Select LM2903DR only for cost-sensitive non-automotive designs where AEC-Q100 compliance is unnecessary. |
| TLV3702IDR | Rail-to-rail input/output, 1.8–16 V supply, 1 µA quiescent current, but 1.5 V minimum supply - incompatible with 12 V-only systems. | Designed for ultra-low-power portable electronics; lacks 36 V tolerance and automotive qualification. | Choose TLV3702IDR only for battery-powered applications below 16 V with strict current budget (<2 µA), not for automotive 12/24 V use. |
Compared with LM2903DR and TLV3702IDR, the LM2903BYDT uniquely combines AEC-Q100 qualification, 36 V absolute maximum rating, rail-to-rail input down to ground, and 250 mV output saturation - making it the only choice for production automotive voltage monitoring where reliability, voltage range, and qualification are mandatory.
Availability
LM2903BYDT is available at Aetrix Electronics and suitable for automotive body control modules, industrial power supply supervision, and battery management systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM2903BYDT 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 management ICs with vertical manufacturing capabilities and broad automotive qualification coverage.
The LM2903B series belongs to ST's precision analog comparators product line, engineered specifically for automotive-grade voltage monitoring, fault detection, and signal conditioning in harsh environments with wide supply and temperature ranges.
FAQ
What is the maximum supply voltage for LM2903BYDT?
The LM2903BYDT supports a maximum supply voltage of 40 V (absolute maximum rating), with guaranteed operation up to 36 V. This allows safe deployment in 24 V automotive systems experiencing load dump transients per ISO 7637-2, without external clamping circuitry.
Does LM2903BYDT require external pull-up resistors on its outputs?
Yes - both Out1 and Out2 are open-collector outputs and must be pulled up to a logic-compatible voltage (e.g., 3.3 V or 5 V) via external resistors. Typical values range from 4.7 kΩ to 10 kΩ depending on rise time and bus capacitance requirements.
Is LM2903BYDT pin-compatible with legacy LM2903 variants?
Yes - LM2903BYDT uses standard SO-8 pinout matching LM2903, LM2903A, and LM2903B variants. However, it offers improved input offset voltage (4–5 mV vs. 7 mV) and AEC-Q100 qualification, making it a drop-in upgrade for automotive designs.
Can LM2903BYDT operate from a dual supply?
Yes - it supports dual supplies from ±1 V to ±18 V. When used in dual-supply mode, VCC+ connects to positive rail and VCC− to negative rail; input common-mode range extends from VCC− to VCC+ −1.5 V, preserving rail-to-rail functionality.
LM2903BYDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 0.15µA @ 36V
- Current - Input Bias (Max):
- 16mA @ 5V
- Current - Output (Typ):
- 2.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 500ns (Typ)
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 125°C
- Operating Temperature:
- Automotive
- Grade:
- AEC-Q100
- Qualification:
- Surface Mount
- :
- 8-SO
LM2903BYDT FAQ
1.How can I place an order for LM2903BYDT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2903BYDT 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 LM2903BYDT reliable?
The price and inventory of LM2903BYDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903BYDT is usually 5 days.
3.What payment methods are accepted for LM2903BYDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2903BYDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2903BYDT?
LM2903BYDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2903BYDT 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 LM2903BYDT?
For technical support, including LM2903BYDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903BYDT requirements.
6.How does Aetrix verify that LM2903BYDT is sourced from the original manufacturer or authorized distributors?
All LM2903BYDT 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 LM2903BYDT meets industry standards.
7.What is the process for return or replacement of LM2903BYDT?
All LM2903BYDT units undergo pre-shipment inspection (PSI). If there is an issue with LM2903BYDT, 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 LM2903BYDT part is unused and in its original packaging.
Return procedure for LM2903BYDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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