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Diodes Incorporated AZ431BZ-BTRE1
- Part No.:
- AZ431BZ-BTRE1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
AZ431BZ-BTRE1.pdf
- Description:
- IC VREF SHUNT ADJ 0.8% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:4,397
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Product details
Overview
AZ431BZ-BTRE1 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.8% reference voltage tolerance, 2.5V nominal VREF, and guaranteed thermal stability from −40°C to +125°C. It delivers sharp turn-on characteristics, 0.2Ω typical dynamic impedance, and sink current capability from 1mA to 100mA - enabling accurate voltage setting (2.5V–18V) in switching power supplies and battery chargers.
For engineers reviewing the AZ431BZ-BTRE1 datasheet, AZ431BZ-BTRE1 pinout, AZ431BZ-BTRE1 application, or AZ431BZ-BTRE1 equivalent, key selection criteria include cathode voltage range (up to 18V), low temperature coefficient (20 ppm/°C typ), reference current (0.7–4 µA), off-state cathode leakage (<1.0 µA), and TO-92 ammo-packaged thermal resistance (107.04°C/W).
Technical Context
The AZ431BZ-BTRE1 operates as a programmable shunt reference using an internal bandgap-derived 2.5V reference and high-gain error amplifier. Its feedback loop compares the divided cathode voltage against VREF at the REF pin, adjusting cathode current to maintain regulation across load and line variations.
It features low output impedance (0.2Ω typ) and stable operation under capacitive loads up to 20µF, with no oscillation observed at VKA = 10V or 15V. The device maintains <4.5mV reference deviation over −40°C to +125°C and exhibits −0.5 to −2.0 mV/V cathode voltage sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.500 V ±0.8% - sets precise output voltage via external resistor divider (VOUT = VREF × (1 + R1/R2)) |
| VKA Max | 18 V - maximum cathode-to-anode voltage for safe regulation without breakdown |
| IKA Range | 1 mA to 100 mA - defines usable sink current window for stable shunt regulation |
| ZKA | 0.2 Ω typical - ensures minimal output voltage shift under dynamic load changes |
| ΔVREF Temp | ≤4.5 mV over −40°C to +125°C - guarantees tight reference stability in automotive/industrial environments |
| IREF | 0.7–4 µA - ultra-low reference input current minimizes divider network power loss |
| θJC | 107.04 °C/W (TO-92) - enables thermal design margin for continuous 100mA operation at TA = +125°C |
Pinout & Package
AZ431BZ-BTRE1 is supplied in TO-92 package with ammo packing (lead form: straight, taping not applicable). Package dimensions: 4.30–4.70 mm length, 3.43 mm min width, 1.60 mm max diameter, 12.50–14.50 mm body height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference Input | High-impedance node connected to internal 2.5V bandgap; requires external resistor divider for voltage programming |
| Pin 2 (ANODE) | Anode Terminal | Connected to system ground or lowest potential node; substrate tie point must be grounded or left open per datasheet Note 1 |
| Pin 3 (CATHODE) | Cathode Output | Regulated output node; sinks current to maintain VREF at REF pin; connects to feedback node of SMPS controller |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2.5V to 18V via two-resistor divider - replaces discrete Zener diodes with superior accuracy and tempco |
| Thermal stability | 20 ppm/°C typical TC - eliminates need for external compensation in wide-temperature industrial designs |
| Capacitive load immunity | Stable with ≥20 µF output capacitance - supports direct use with bulk electrolytics in charger output stages |
| Low quiescent current | 0.7–4 µA reference current - reduces divider power loss by >90% vs. standard 1mA Zener bias networks |
| High reliability rating | ESD HBM = 2000 V - withstands handling in non-ESD-controlled assembly environments |
Applications
| Charger Output Regulation | Switching Power Supply Feedback |
|---|---|
|
Use Scenario: Secondary-side voltage regulation in USB PD and Li-ion battery chargers requiring ±1% output accuracy over temperature. IC Role / Device Role / Timing Role: Adjustable shunt reference providing feedback signal to optocoupler or TL431-compatible controller IC. Use Value: Enables 0.8% initial accuracy and ≤4.5mV drift over −40°C to +125°C, reducing need for post-production calibration. |
Use Scenario: Voltage sensing node in isolated flyback or forward converters where primary-side regulation is impractical. IC Role / Device Role / Timing Role: Precision shunt reference generating error signal for opto-coupled feedback loop. Use Value: 0.2Ω dynamic impedance ensures fast transient response to load steps without external compensation. |
| Voltage Adapter Reference | Graphics Card VRM Monitoring |
|
Use Scenario: Programmable 5V/12V adapter modules needing stable reference under variable input (9–24V DC). IC Role / Device Role / Timing Role: Cathode-connected to regulated rail; REF pin tied to resistor divider for setpoint configuration. Use Value: 18V cathode rating and 100mA sink capacity support direct use with unregulated inputs up to 24V. |
Use Scenario: GPU voltage rail monitoring in desktop graphics cards requiring tight tolerance and thermal resilience. IC Role / Device Role / Timing Role: Shunt-based reference feeding ADC input or comparator for overvoltage protection logic. Use Value: −40°C to +125°C operating range matches GPU junction temperature envelope; low noise avoids false triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | 0.5% VREF tolerance, SOT-23-5 package, higher IREF (1–4 µA), 36V VKA max | Better accuracy but higher cost; requires PCB redesign for 5-pin layout and different thermal profile | Preferred when tighter initial tolerance (±0.5%) is required and SOT-23-5 footprint is acceptable |
| AS431AZTR-E1 | 0.8% VREF tolerance, TO-92 package, 100mA IKA, but 10 ppm/°C TC and 0.35Ω ZKA | Lower tempco and impedance than AZ431BZ-BTRE1, but limited to 125°C max junction temperature | Valid drop-in replacement only if ambient temperature stays below +105°C and 0.35Ω impedance is acceptable |
Compared with TL431ACDBVR and AS431AZTR-E1, AZ431BZ-BTRE1 offers optimal balance of TO-92 compatibility, 0.8% tolerance, 20 ppm/°C tempco, and 0.2Ω impedance - making it ideal for cost-sensitive, thermally demanding charger and adapter designs where pin-for-pin replacement is required.
Availability
AZ431BZ-BTRE1 is available at Aetrix Electronics and suitable for switching power supply feedback, battery charger regulation, and voltage adapter reference applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AZ431BZ-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.
AZ431BZ-BTRE1 belongs to Diodes' precision shunt regulator product line, engineered specifically for high-stability voltage reference in power conversion systems where Zener diode limitations - including poor tempco and inconsistent knee characteristics - must be overcome.
FAQ
What is the minimum cathode current required for regulation in AZ431BZ-BTRE1?
The minimum cathode current for stable regulation is 0.4 mA at −40°C to +125°C, with typical value of 1.0 mA at +25°C. This ensures reliable turn-on even under cold-start conditions in automotive or outdoor equipment, and allows use with high-value resistor dividers to minimize standby power.
Can AZ431BZ-BTRE1 replace a standard 3.3V Zener diode directly?
No - AZ431BZ-BTRE1 is a 2.5V reference requiring external resistors to set output voltage. To replace a 3.3V Zener, connect REF to a divider tapping 3.3V from cathode, with R1 = 3.3kΩ and R2 = 10kΩ (VOUT = 2.5 × (1 + 3.3/10) ≈ 3.33V). No additional biasing is needed.
Does AZ431BZ-BTRE1 require an output capacitor for stability?
No external capacitor is required for basic regulation, and the device remains stable with up to 20 µF capacitive load per datasheet testing. However, a 100nF ceramic capacitor between CATHODE and ANODE is recommended for high-frequency noise suppression in SMPS feedback paths.
What is the meaning of "BTRE1" in AZ431BZ-BTRE1?
"B" indicates 0.8% VREF tolerance; "T" = tape-and-reel packaging; "R" = RoHS-compliant; "E1" = lead-free, halogen-free, and green-compliant finish. The "Z" denotes TO-92 ammo-packaged variant - distinct from bulk (BE1) or SOT-23 (BN-BTRE1) versions.
AZ431BZ-BTRE1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Tape & Box (TB)
- 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:
- ±0.8%
- 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:
- Through Hole
- Supplier Device Package:
- TO-92
AZ431BZ-BTRE1 FAQ
1.How can I place an order for AZ431BZ-BTRE1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431BZ-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 AZ431BZ-BTRE1 reliable?
The price and inventory of AZ431BZ-BTRE1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431BZ-BTRE1 is usually 5 days.
3.What payment methods are accepted for AZ431BZ-BTRE1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431BZ-BTRE1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431BZ-BTRE1?
AZ431BZ-BTRE1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431BZ-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 AZ431BZ-BTRE1?
For technical support, including AZ431BZ-BTRE1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431BZ-BTRE1 requirements.
6.How does Aetrix verify that AZ431BZ-BTRE1 is sourced from the original manufacturer or authorized distributors?
All AZ431BZ-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 AZ431BZ-BTRE1 meets industry standards.
7.What is the process for return or replacement of AZ431BZ-BTRE1?
All AZ431BZ-BTRE1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431BZ-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 AZ431BZ-BTRE1 part is unused and in its original packaging.
Return procedure for AZ431BZ-BTRE1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431BZ-BTRE1 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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AZ431LBNTR-G1
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LM4040D20IDBZR
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AZ431LANTR-G1
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