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Diodes Incorporated LM2903AQS-13
- Part No.:
- LM2903AQS-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2903AQS-13.pdf
- Description:
- IC COMPARATOR 2 DIFF 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,671
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Product details
Overview
LM2903AQS-13 from Diodes Incorporated is an automotive-grade dual differential voltage comparator with A-suffix precision (1 mV typical input offset voltage), rail-to-rail common-mode input range including ground, and open-collector outputs compatible with TTL/CMOS logic. It operates from 2 V to 36 V single supply or ±1.0 V to ±18 V dual supplies, draws only 0.6 mA supply current at 30 V, and is qualified to AEC-Q100 Grade 1 for engine control, battery monitoring, and power rail supervision.
For engineers reviewing the LM2903AQS-13 datasheet, LM2903AQS-13 pinout, LM2903AQS-13 application, or LM2903AQS-13 equivalent, key selection criteria include its 1 mV offset voltage grade, SO-8 package compatibility, -40°C to +125°C operating range, and open-collector output drive capability up to 16 mA sink current with 200 mV saturation voltage at 4 mA.
Technical Context
The LM2903AQS-13 integrates two independent comparators with PNP input stages enabling common-mode voltage down to ground and up to VCC − 1.5 V. Its uncommitted NPN output transistors support wired-OR configurations and flexible pull-up to any voltage within the 36 V absolute maximum rating - independent of VCC.
Input bias current is 25 nA (typ), offset current ±5 nA (typ), and large-signal response time is 300 ns under 100 mV step with 5 mV overdrive. The device maintains stable operation across automotive temperature extremes without external hysteresis in pulse-driven applications, though hysteresis is recommended for noisy DC thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 1 mV (typ) - enables accurate threshold detection at low differential voltages |
| Supply Current | 0.6 mA (typ) at 30 V - supports low-power always-on monitoring circuits |
| Common-Mode Input Range | 0 V to VCC − 1.5 V - allows direct sensing of signals referenced to ground |
| Output Sink Current | 16 mA (min) - drives LEDs, relays, or logic inputs without external buffers |
| Saturation Voltage | 200 mV at 4 mA - ensures reliable low-state logic level under load |
| Operating Temperature | −40°C to +125°C - meets under-hood automotive ambient requirements |
| Differential Input Voltage | 36 V (max) - permits input signals exceeding VCC without damage |
Pinout & Package
LM2903AQS-13 is housed in a Pb-free, RoHS-compliant SO-8 package (JEDEC MS-012AC) with 1.27 mm pitch, qualified to AEC-Q100 Grade 1 and manufactured in IATF 16949-certified facilities.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Open-collector output of comparator 1 - requires external pull-up for logic high |
| 2 | IN1− | Inverting input of comparator 1 - accepts signals down to ground |
| 3 | IN1+ | Non-inverting input of comparator 1 - supports rail-to-rail common-mode range |
| 4 | GND | Analog/digital ground reference - shared return for both comparators |
| 5 | IN2+ | Non-inverting input of comparator 2 - electrically isolated from IN1± |
| 6 | IN2− | Inverting input of comparator 2 - enables independent differential sensing |
| 7 | OUT2 | Open-collector output of comparator 2 - supports wired-OR with OUT1 |
| 8 | VCC | Positive supply pin - powers both comparators and output stages |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive powertrain and chassis systems with PPAP support |
| 1 mV offset voltage (A-suffix) | Reduces false triggering in precision window or zero-crossing detection |
| 2 V to 36 V single-supply operation | Eliminates need for level-shifting in 12 V/24 V vehicle electrical architectures |
| Open-collector outputs | Enables flexible logic interfacing and multi-comparator wired-OR functions |
| Input common-mode range includes ground | Supports direct connection to sensors or shunt resistors without biasing networks |
Applications
| Engine Coolant Level Detection | Battery Voltage Supervisor |
|---|---|
Use Scenario: Monitoring float switch or capacitive sensor output against fixed reference to detect low coolant level in radiator expansion tank. IC Role / Device Role / Timing Role: Dual comparator configured as window detector - one channel triggers low-level alarm, second validates sensor integrity. Use Value: 1 mV offset ensures <10 mV detection resolution; open-collector outputs interface directly with CAN/LIN transceiver enable pins. | Use Scenario: Continuous monitoring of 12 V lead-acid battery voltage during engine start-stop cycles to prevent deep discharge. IC Role / Device Role / Timing Role: Precision threshold comparator comparing battery voltage to 11.8 V and 12.8 V references for under/over-voltage flags. Use Value: Rail-to-rail input range allows direct connection to battery via resistor divider; −40°C to +125°C rating ensures reliability in under-hood environments. |
| DC-DC Converter Overvoltage Protection | Brake Light Activation Logic |
Use Scenario: Fast-response overvoltage shutdown for 5 V buck converter supplying ADAS camera module. IC Role / Device Role / Timing Role: High-speed comparator detecting >5.5 V on output rail and asserting fault signal to controller within 300 ns. Use Value: 300 ns propagation delay enables sub-microsecond fault response; 36 V differential input withstands transient spikes during load dump. | Use Scenario: Converting brake pedal position sensor analog output into clean ON/OFF signal for LED brake light driver IC. IC Role / Device Role / Timing Role: Single comparator with hysteresis converting linear potentiometer voltage into noise-immune digital brake command. Use Value: 25 nA input bias current prevents loading of high-impedance sensor; SO-8 package fits compact lighting control PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2903QDR | Same AEC-Q100 Grade 1 spec, SO-8 package, but non-A suffix (2 mV offset) | Lower precision threshold detection; suitable where 2 mV offset is acceptable | Select when cost sensitivity outweighs need for 1 mV offset accuracy |
| TLV1702QDRQ1 | Rail-to-rail input/output, 0.9 V to 36 V supply, 0.35 mV offset, but higher quiescent current (85 µA) | Superior precision and wider supply range, but not optimized for high sink-current loads | Prefer for ultra-low-power systems requiring sub-millivolt accuracy and RRIO operation |
Compared with LM2903QDR, LM2903AQS-13 delivers tighter offset for critical thresholds; versus TLV1702QDRQ1, it offers higher output drive and lower cost in high-volume automotive production, albeit with less precision and no rail-to-rail output swing.
Availability
LM2903AQS-13 is available at Aetrix Electronics and suitable for engine control units, battery management systems, and lighting control modules requiring stable component supply across automotive production lifecycles.
Supply support for LM2903AQS-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and computing markets.
The LM2903AQS-13 belongs to Diodes' AEC-Q100-qualified comparator portfolio, designed specifically for automotive power management, safety-critical sensing, and robust signal conditioning in harsh environments.
FAQ
What is the maximum allowable differential input voltage for LM2903AQS-13?
The absolute maximum differential input voltage is 36 V, as specified in the datasheet Absolute Maximum Ratings table. This allows inputs to exceed the VCC rail without damage - critical for handling load-dump transients in automotive 12 V systems. Operation remains functional as long as each input stays within the common-mode range (0 V to VCC − 1.5 V) and does not go below −0.3 V.
Can LM2903AQS-13 drive a 5 V TTL input directly?
Yes - its open-collector output can sink up to 16 mA while maintaining ≤200 mV saturation voltage at 4 mA, satisfying TTL low-level input requirements (VIL ≤ 0.8 V). A 1 kΩ pull-up to 5 V provides ~5 mA sink current, well within specification. No level-shifting circuitry is needed for standard TTL interfacing.
Does LM2903AQS-13 require external hysteresis in all applications?
No - hysteresis is only required for DC or slowly varying input signals subject to noise near the switching threshold. The datasheet explicitly states that hysteresis is unnecessary for pulse waveforms with fast rise/fall times. For engine speed sensing or PWM-based feedback, the comparator operates reliably without added positive feedback.
Is the LM2903AQS-13 pin-compatible with legacy LM2903 variants?
Yes - it uses the industry-standard SO-8 pinout defined for LM2903Q/LM2903AQ devices: Pin 1 = OUT1, Pin 2 = IN1−, Pin 3 = IN1+, Pin 4 = GND, Pin 5 = IN2+, Pin 6 = IN2−, Pin 7 = OUT2, Pin 8 = VCC. This enables drop-in replacement of earlier LM2903Q variants in existing AEC-Q100-compliant designs without PCB revision.
LM2903AQS-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- 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
- :
- 2mV @ 5V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 16mA @ 5V
- Current - Output (Typ):
- 1.7mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 125°C
- Operating Temperature:
- Automotive
- Grade:
- AEC-Q100
- Qualification:
- Surface Mount
- :
- 8-SO
LM2903AQS-13 FAQ
1.How can I place an order for LM2903AQS-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2903AQS-13 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 LM2903AQS-13 reliable?
The price and inventory of LM2903AQS-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2903AQS-13 is usually 5 days.
3.What payment methods are accepted for LM2903AQS-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2903AQS-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2903AQS-13?
LM2903AQS-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2903AQS-13 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 LM2903AQS-13?
For technical support, including LM2903AQS-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2903AQS-13 requirements.
6.How does Aetrix verify that LM2903AQS-13 is sourced from the original manufacturer or authorized distributors?
All LM2903AQS-13 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 LM2903AQS-13 meets industry standards.
7.What is the process for return or replacement of LM2903AQS-13?
All LM2903AQS-13 units undergo pre-shipment inspection (PSI). If there is an issue with LM2903AQS-13, 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 LM2903AQS-13 part is unused and in its original packaging.
Return procedure for LM2903AQS-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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