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Diodes Incorporated AS331KTR-G1
- Part No.:
- AS331KTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AS331KTR-G1.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,053
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Product details
Overview
AS331KTR-G1 from Diodes Incorporated is a single-channel, low-power, precision voltage comparator with 1.0 mV typical input offset voltage, open-collector output, and operation from 2 V to 36 V single supply (±1 V to ±18 V dual). It features 25 nA typical input bias current, 200 ns typical response time, and input common-mode range extending to ground-enabling use in battery monitoring, power supply supervision, and threshold detection circuits.
For engineers reviewing the AS331KTR-G1 datasheet, AS331KTR-G1 pinout, AS331KTR-G1 application, or AS331KTR-G1 equivalent, key selection criteria include its rail-to-rail input capability down to ground, low quiescent current (0.4 mA at 5 V), open-collector output compatibility with TTL/CMOS logic, and guaranteed operation across –40°C to +85°C ambient temperature.
Technical Context
The AS331KTR-G1 implements a PNP-input differential pair architecture enabling input common-mode voltage down to ground and up to VCC–1.5 V. Its high DC voltage gain (>50 V/mV) ensures clean switching under low overdrive conditions, while internal compensation maintains stability without external components.
Designed for single-supply industrial and portable systems, it delivers consistent 200 ns propagation delay across 5 V–30 V supply range and supports sinking up to 16 mA with 200 mV typical saturation voltage at 4 mA load-critical for driving LEDs, MOSFET gates, or logic inputs directly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V single supply; enables direct integration into 3.3 V, 5 V, 12 V, and 24 V systems without level-shifting. |
| Input Offset Voltage | 1.0 mV typical; ensures accurate threshold detection within ±5 mV over temperature, critical for battery end-of-charge sensing. |
| Supply Current | 0.4 mA typical at 5 V; reduces standby power in always-on monitoring circuits such as smoke detectors or UPS status monitors. |
| Response Time | 200 ns typical; supports fast edge detection in switching power supply feedback loops and pulse-width modulation comparators. |
| Input Bias Current | 25 nA typical; minimizes voltage error across high-impedance sensor dividers (e.g., thermistor or photodiode interfaces). |
| Output Type | Open-collector; allows wired-OR logic, flexible pull-up selection (e.g., 3.3 V or 5 V), and direct interface to microcontroller interrupt pins. |
| Common-Mode Range | 0 V to VCC–1.5 V; permits direct sensing of grounded-referenced signals like battery voltage or system ground-return currents. |
Pinout & Package
The AS331KTR-G1 is housed in a 5-pin SOT25 (SC-74A) surface-mount package measuring 2.80 mm × 1.60 mm × 1.10 mm (L × W × H), with matte tin-plated leads compliant to MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN–) | Inverting Input | Accepts reference or feedback signal; supports common-mode down to 0 V for ground-referenced thresholds. |
| 2 (IN+) | Non-inverting Input | Accepts sensed signal (e.g., battery voltage); differential input range spans full supply rails. |
| 3 (GND) | Ground Reference | Return path for supply and inputs; required for single-supply operation with ground-referenced inputs. |
| 4 (VCC) | Positive Supply | Single-supply input (2–36 V) or positive rail in dual-supply mode (±1–±18 V). |
| 5 (OUT) | Open-Collector Output | Sinks current only; requires external pull-up to define logic-high level and drive load (e.g., LED, MOSFET gate, or MCU pin). |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | Operates from 2 V to 36 V single supply-eliminates need for dedicated LDOs in multi-rail systems like PC motherboards or telecom modules. |
| Low Input Offset Voltage | 1.0 mV typical ensures <±5 mV total error over temperature-enables precise 1% battery voltage window detection without trimming. |
| Ground-Sensing Inputs | Input common-mode includes 0 V-allows direct connection to battery negative terminals or shunt resistors without level shifters. |
| Fast Response Time | 200 ns typical propagation delay supports real-time overvoltage/undervoltage shutdown in DC-DC converters operating above 100 kHz. |
| Open-Collector Output | Enables flexible logic interfacing: pull-up to 3.3 V for MCU I/O, 5 V for legacy peripherals, or 12 V for relay drivers-no voltage translation needed. |
Applications
| Battery Charger Monitoring | Switching Power Supply Feedback |
|---|---|
Use Scenario: Detecting end-of-charge voltage threshold (e.g., 4.2 V per Li-ion cell) and triggering charge termination. IC Role / Device Role / Timing Role: Precision voltage comparator comparing battery voltage against stable reference. Use Value: 1.0 mV offset ensures ≤0.025% error at 4.2 V, preventing overcharge and extending cycle life. |
Use Scenario: Comparing regulated output voltage against feedback divider to control PWM duty cycle in buck converter. IC Role / Device Role / Timing Role: High-speed comparator in error amplifier loop with 200 ns response supporting >100 kHz switching. Use Value: Low 25 nA input bias avoids loading high-value feedback resistors, preserving regulation accuracy. |
| PC Motherboard Power Sequencing | Industrial Sensor Threshold Detection |
Use Scenario: Validating 3.3 V, 5 V, and 12 V rail presence before releasing CPU reset signal during boot. IC Role / Device Role / Timing Role: Multi-rail supervisor using discrete comparators for independent voltage monitoring. Use Value: Single-supply operation from each rail eliminates need for auxiliary bias supplies-reducing BOM count. |
Use Scenario: Converting analog sensor output (e.g., pressure transducer) into digital on/off signal for PLC input. IC Role / Device Role / Timing Role: Threshold detector with hysteresis added externally via feedback resistor. Use Value: Input common-mode range including ground allows direct connection to ratiometric sensors referenced to system ground. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | Higher input offset voltage (2 mV typ), slower response (1.3 µs), no guaranteed operation below 2 V supply. | Less suitable for low-voltage battery cutoff or precision 1% threshold detection. | Select when cost is primary constraint and 2 mV offset is acceptable in 5 V+ systems. |
| TLV3701IDBVR | Lower supply current (850 nA), rail-to-rail input, but open-drain output only rated to 5.5 V. | Not viable for 12 V or 24 V industrial monitoring without level-shifting circuitry. | Prefer for ultra-low-power battery-operated devices where supply ≤5.5 V and sub-µA quiescent current is mandatory. |
Compared with LM393DR and TLV3701IDBVR, the AS331KTR-G1 uniquely balances wide supply range (2–36 V), low offset (1 mV), and fast response (200 ns) without sacrificing ground-sensing capability-making it optimal for universal voltage monitoring across automotive, industrial, and computing power domains.
Availability
AS331KTR-G1 is available at Aetrix Electronics and suitable for battery chargers, switching power supplies, and PC motherboards requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for AS331KTR-G1 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, energy-efficient components for industrial, computing, and consumer markets.
The AS331 belongs to Diodes' precision analog comparator product line, engineered for robust performance in power management, battery protection, and system supervision applications across extended temperature ranges.
FAQ
What is the maximum supply voltage rating for AS331KTR-G1?
The absolute maximum supply voltage is 40 V, but the recommended operating range is 2 V to 36 V for reliable long-term performance. Operation beyond 36 V risks exceeding internal junction temperature limits and degrading offset voltage stability over time-even if within absolute ratings.
Can AS331KTR-G1 operate with inputs below ground?
No-the input common-mode range extends to –0.3 V minimum at 25°C. Driving either input below –0.3 V forward-biases internal PNP base-collector junctions, causing temporary output latch-up until the input recovers above –0.3 V. Ground-referenced designs must ensure inputs stay ≥ –0.3 V.
Does AS331KTR-G1 require external hysteresis for noise immunity?
Yes-AS331KTR-G1 has no built-in hysteresis. For noisy environments (e.g., motor drives or SMPS feedback), add positive feedback via a resistor from OUT to IN+ to create 10–50 mV of hysteresis, preventing oscillation near threshold crossings.
Is AS331KTR-G1 qualified for automotive applications?
No-AS331KTR-G1 is specified for industrial temperature range (–40°C to +85°C) and is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., AS331QTR-G1) with PPAP documentation, IATF 16949 manufacturing, and extended qualification testing for vehicle use.
AS331KTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 1
- Output Type:
- Open-Collector
- Voltage - Supply, Single/Dual (±):
- 2V ~ 36V, ±1V ~ 18V
- :
- 5mV @ 5V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 16mA @ 5V
- Current - Output (Typ):
- 1mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -40°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-23-5
AS331KTR-G1 FAQ
1.How can I place an order for AS331KTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS331KTR-G1 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 AS331KTR-G1 reliable?
The price and inventory of AS331KTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS331KTR-G1 is usually 5 days.
3.What payment methods are accepted for AS331KTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS331KTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS331KTR-G1?
AS331KTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS331KTR-G1 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 AS331KTR-G1?
For technical support, including AS331KTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS331KTR-G1 requirements.
6.How does Aetrix verify that AS331KTR-G1 is sourced from the original manufacturer or authorized distributors?
All AS331KTR-G1 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 AS331KTR-G1 meets industry standards.
7.What is the process for return or replacement of AS331KTR-G1?
All AS331KTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AS331KTR-G1, 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 AS331KTR-G1 part is unused and in its original packaging.
Return procedure for AS331KTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AS331KTR-G1 Tags
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