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Diodes Incorporated AZ431AN-BTRE1
- Part No.:
- AZ431AN-BTRE1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AZ431AN-BTRE1.pdf
- Description:
- IC VREF SHUNT ADJ 0.4% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,283
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Product details
Overview
AZ431AN-BTRE1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.4% reference voltage tolerance, 2.5V nominal VREF, and 20V cathode voltage rating. It operates from -40°C to +125°C, delivers 1–100mA sink current, and features 0.2Ω typical dynamic impedance-enabling stable voltage reference and error amplification in switching power supplies, battery chargers, and graphic card VRMs.
For engineers reviewing the AZ431AN-BTRE1 datasheet, AZ431AN-BTRE1 pinout, AZ431AN-BTRE1 application, or AZ431AN-BTRE1 equivalent, this device serves as a programmable 2.5–18V shunt reference with low temperature drift (4.5mV typ over full range), high capacitive load stability, and RoHS-compliant SOT-23-3 packaging-critical for compact, thermally demanding DC-DC feedback loops.
Technical Context
The AZ431AN-BTRE1 implements an internal bandgap reference and transconductance amplifier driving an NPN output stage, enabling precise regulation via external resistor divider feedback. Its sharp turn-on characteristic and low 0.2Ω dynamic impedance ensure fast transient response and minimal output deviation under load step changes.
It functions as a two-input comparator with REF pin sensing 2.5V threshold and cathode-anode path sinking current proportional to error voltage. The device requires no external compensation for stability with ≤10µF capacitive loads and maintains regulation down to 0.4mA minimum cathode current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.500V ±0.4% - sets precise 2.5V internal reference for external voltage programming |
| VKA Max | 20V - supports up to 18V regulated output when used with R1/R2 divider |
| IKA Range | 1mA to 100mA - enables direct error-sink operation without external transistor buffering |
| ZKA | 0.2Ω typical - ensures <1mV output shift per 0.2mA load change at VREF node |
| ΔVREF Temp | 4.5mV max over -40°C to +125°C - guarantees <0.18% reference drift across industrial temp range |
| θJC | 177.65°C/W (SOT-23) - defines thermal resistance from junction to case for PCB copper pad design |
| ESD HBM | 2000V - meets standard handling requirements for automated assembly environments |
Pinout & Package
SOT-23-3 package: 3-pin surface-mount plastic case with gull-wing leads, 2.9mm × 1.3mm footprint, 1.1mm height, and exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF) | Reference Input | High-impedance input sensing 2.5V threshold; connects to resistor divider midpoint for output voltage setting |
| 2 (ANODE) | Anode Terminal | Connects to system ground or return path; forms current sink path with cathode |
| 3 (CATHODE) | Cathode Terminal | Output node sinking current into feedback network; voltage here determines regulated output via R1/R2 ratio |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | Programmable 2.5V to 18V using two external resistors-replaces multiple fixed Zener diodes |
| Thermal Stability | 20ppm/°C typical temperature coefficient-ensures <±0.025V drift over full -40°C to +125°C range |
| Capacitive Load Tolerance | Stable with ≥10µF ceramic output capacitance-eliminates need for series damping resistors in SMPS feedback |
| Low Reference Current | 0.7µA typical IREF-minimizes divider power loss and improves efficiency in battery-powered systems |
| Wide Operating Temperature | -40°C to +125°C ambient rating-qualified for under-hood automotive and industrial power modules |
Applications
| Switching Power Supply | Battery Charger |
|---|---|
Use Scenario: Secondary-side voltage feedback in isolated flyback or forward converters. IC Role / Device Role / Timing Role: Precision shunt reference generating error signal for optocoupler-coupled PWM controller. Use Value: Enables ±0.4% output regulation accuracy and stable loop response with 10µF output caps-reducing need for post-regulation LDOs. | Use Scenario: Constant-voltage/constant-current control in USB PD and multi-cell Li-ion chargers. IC Role / Device Role / Timing Role: Adjustable reference for current-sense amplifier and voltage-set DAC interface. Use Value: Supports 4.2V–12.6V battery voltage ranges with <4.5mV reference drift-improving charge termination accuracy across temperature. |
| Graphics Card VRM | Precision Voltage Reference |
Use Scenario: Feedback reference for GPU core voltage (VDDC) regulation in PCIe-based graphics cards. IC Role / Device Role / Timing Role: High-stability shunt reference in multiphase buck converter feedback network. Use Value: Maintains <±1% output tolerance under 10A load transients and 85°C board temperature-preventing GPU throttling. | Use Scenario: Calibration reference in data acquisition front-ends and sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source for ADC reference buffers and DAC output trimming. Use Value: Delivers 2.5V ±0.01V absolute accuracy with <0.2Ω output impedance-reducing code-width errors in 16-bit SAR ADCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431ACDBVR | 0.5% VREF tolerance, 1.24V reference, SOT-23-5 package with NC pin | Lowers minimum output to 1.24V; requires different resistor scaling; higher IREF (1.2µA) | Select when lower reference voltage or tighter layout routing (5-pin) is needed |
| KIA431AP | 2.5V VREF, 1% tolerance, TO-92 package, -20°C to +85°C rating | Limited temperature range and looser tolerance; higher ZKA (1.0Ω); no RoHS/Green option | Select only for cost-sensitive, non-automotive consumer applications with relaxed spec |
Compared with TLV431ACDBVR and KIA431AP, the AZ431AN-BTRE1 offers superior thermal stability (4.5mV vs. 10mV drift), tighter 0.4% tolerance for high-accuracy outputs, and industrial-grade temperature support-making it optimal for power supply feedback where long-term calibration integrity is critical.
Availability
AZ431AN-BTRE1 is available at Aetrix Electronics and suitable for switching power supplies, battery chargers, and graphics card VRMs requiring stable component supply, consistent parametric performance, and RoHS-compliant SMT packaging.
Supply support for AZ431AN-BTRE1 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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The AZ431-B series belongs to Diodes' precision reference product line, engineered specifically for high-accuracy, thermally robust shunt regulation in power conversion feedback paths-targeting industrial, computing, and communications infrastructure.
FAQ
What is the minimum cathode current required for regulation in AZ431AN-BTRE1?
The AZ431AN-BTRE1 requires a minimum cathode current of 0.4mA to maintain regulation, verified per datasheet Section 5 (Electrical Characteristics). This value ensures reliable turn-on and stable reference operation even under light-load conditions in battery-powered or standby-mode circuits.
Can AZ431AN-BTRE1 replace a Zener diode directly in existing designs?
Yes-AZ431AN-BTRE1 can directly replace Zener diodes rated 2.5V–18V by connecting REF to the Zener cathode node, ANODE to ground, and CATHODE to the original Zener anode. No additional components are needed, though resistor values may require recalculation to match target output voltage.
Does AZ431AN-BTRE1 require external compensation for stability?
No external compensation is required. The device remains stable with capacitive loads up to 10µF, as confirmed in Figure 15 (Stability Boundary Conditions vs. Load Capacitance) of the datasheet. For >10µF loads, a small series resistor (<10Ω) may be added at the cathode to damp oscillation.
What is the thermal resistance (θJC) of AZ431AN-BTRE1 in its SOT-23 package?
The junction-to-case thermal resistance (θJC) for AZ431AN-BTRE1 in SOT-23 is 177.65°C/W, specified in Table 3 (Absolute Maximum Ratings) of the datasheet. This value applies to standard PCB mounting with 1-inch² 2oz copper pad and defines maximum allowable power dissipation before junction temperature exceeds 150°C.
AZ431AN-BTRE1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 100 mA
- Tolerance:
- ±0.4%
- Temperature Coefficient:
- 20ppm/°C Typical
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 1 mA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AZ431AN-BTRE1 FAQ
1.How can I place an order for AZ431AN-BTRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431AN-BTRE1 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 AZ431AN-BTRE1 reliable?
The price and inventory of AZ431AN-BTRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431AN-BTRE1 is usually 5 days.
3.What payment methods are accepted for AZ431AN-BTRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431AN-BTRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431AN-BTRE1?
AZ431AN-BTRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431AN-BTRE1 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 AZ431AN-BTRE1?
For technical support, including AZ431AN-BTRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431AN-BTRE1 requirements.
6.How does Aetrix verify that AZ431AN-BTRE1 is sourced from the original manufacturer or authorized distributors?
All AZ431AN-BTRE1 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 AZ431AN-BTRE1 meets industry standards.
7.What is the process for return or replacement of AZ431AN-BTRE1?
All AZ431AN-BTRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431AN-BTRE1, 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 AZ431AN-BTRE1 part is unused and in its original packaging.
Return procedure for AZ431AN-BTRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431AN-BTRE1 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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