My Inquiry
My Account
Diodes Incorporated AZ431LBZTR-G1
- Part No.:
- AZ431LBZTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
AZ431LBZTR-G1.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:1,821
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AZ431LBZTR-G1 from Diodes Incorporated is a 1.0% tolerance, low-voltage (1.24 V nominal) adjustable precision shunt regulator in TO92 (Ammo Packing) package, designed for voltage reference and feedback control in switching power supplies, PC motherboards, and chargers. It delivers stable regulation across –40°C to +125°C, supports 0.1–100 mA sink current, and achieves 20 ppm/°C typical temperature coefficient with 0.05 Ω dynamic output impedance.
For engineers reviewing the AZ431LBZTR-G1 datasheet, AZ431LBZTR-G1 pinout, AZ431LBZTR-G1 application, or AZ431LBZTR-G1 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation value, and confirmed alternative options for voltage reference selection in industrial and computing power systems.
Technical Context
The AZ431LBZTR-G1 operates as a three-terminal programmable shunt reference, using an internal bandgap reference and high-gain error amplifier to maintain precise cathode-to-reference voltage. Its sharp turn-on and low output impedance enable stable closed-loop feedback in PWM controllers and linear regulators.
It functions within a 1.24 V to 18 V output range set by two external resistors, with guaranteed thermal stability over full industrial temperature range. The device exhibits low reference current drift (0.1–0.4 µA over –40°C to +125°C) and minimal cathode voltage sensitivity (–0.5 to –1.5 mV/V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 1.240 V nominal (1.0% tolerance: 1.228–1.252 V at 25°C); sets minimum programmable output voltage for feedback networks. |
| ΔVREF (–40°C to +125°C) | ±4 mV max deviation; ensures <0.33% reference drift over full operating range-critical for stable output in wide-temperature environments. |
| ZKA (Dynamic Impedance) | 0.05 Ω typical (≤0.15 Ω max); enables tight regulation under fast load transients without external compensation. |
| IKA Range | 0.1–100 mA sink capability; supports direct use in 5 V/1 A regulator feedback paths and high-current shunt applications. |
| θJC (TO92) | 140.80 °C/W junction-to-case thermal resistance; defines maximum power dissipation (770 mW) before thermal shutdown in standard PCB mounting. |
| Operating Temp | –40°C to +125°C ambient; qualified for industrial and extended-temperature motherboard and adapter designs. |
| Package | TO92 (Ammo Packing); through-hole compatible, cost-effective for legacy and high-reliability power supply assemblies. |
Pinout & Package
Package: TO92 (Ammo Packing), 3-pin through-hole, lead-free and RoHS-compliant "Green" molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (REF) | Reference Input | High-impedance node connected to resistor divider midpoint; sets regulated voltage via external R1/R2 network. |
| Pin 2 (ANODE) | Anode Terminal | Internally tied to substrate; must be connected to system ground or left open-determines thermal path and noise coupling in layout. |
| Pin 3 (CATHODE) | Cathode Output | Sink current output node; connects to feedback point of DC-DC converter or voltage adapter output for closed-loop regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable VOUT range | 1.24 V to 18 V via two resistors-enables single BOM part for multiple output rails (e.g., 3.3 V, 5 V, 12 V adapters). |
| Low tempco | 20 ppm/°C typical-reduces output drift to <2.4 mV over 125°C span, eliminating need for external trimming in precision supplies. |
| Capacitive load stability | Stable with ≥1.8 µF output capacitance-supports ceramic capacitor use without phase compensation in compact charger designs. |
| Low IREF | 0.15 µA typical reference input current-minimizes divider resistor power loss and improves efficiency in battery-powered adapters. |
| High sink current | 100 mA max cathode current-allows direct integration into high-power shunt regulators without external transistor buffering. |
Applications
| Graphic Cards | PC Motherboards |
|---|---|
|
Use Scenario: Voltage reference for GPU core VRM feedback loop in PCIe-based graphics cards. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 0.8–1.2 V feedback signal to multiphase controller ICs. Use Value: ±4 mV VREF drift over temperature ensures <±1% output voltage accuracy across GPU thermal cycling, preventing throttling or instability. |
Use Scenario: 3.3 V and 5 V rail monitoring and regulation on ATX-compatible motherboards. IC Role / Device Role / Timing Role: Adjustable shunt reference in secondary-side feedback path of standby and main ATX PSUs. Use Value: 0.05 Ω dynamic impedance maintains regulation during CPU load transients, reducing need for bulk output capacitance. |
| Voltage Adapters | Chargers |
|
Use Scenario: Compact AC/DC wall adapters delivering 5 V/2.4 A for USB-C PD accessories. IC Role / Device Role / Timing Role: Primary-side feedback reference for flyback controller ICs in isolated offline converters. Use Value: TO92 package enables low-cost through-hole assembly; 1.0% tolerance meets Class VI efficiency compliance without calibration. |
Use Scenario: Constant-voltage stage in multi-chemistry Li-ion battery chargers (e.g., 4.2 V per cell). IC Role / Device Role / Timing Role: Shunt reference setting charge termination voltage with temperature compensation via external NTC. Use Value: Low 0.15 µA IREF minimizes quiescent current in always-on charging circuits, extending no-load efficiency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBZR | 0.5% initial tolerance, SOT23 package, higher 2.5 V minimum cathode voltage, 0.2 Ω ZKA. | Requires higher minimum operating voltage; less suitable for low-VIN adapters below 3 V. | Preferred where tighter initial accuracy is required and board space allows SOT23 surface-mount placement. |
| AS431AZTR-E1 | 1.0% tolerance, same TO92 package, but 30 ppm/°C tempco and 0.25 Ω ZKA; RoHS-compliant only (not "Green"). | Higher output impedance limits transient response in high-frequency switchers; wider tempco reduces accuracy at extremes. | Acceptable for cost-sensitive, non-automotive applications where 125°C operation is not required. |
Compared with TL431BIDBZR and AS431AZTR-E1, the AZ431LBZTR-G1 offers superior thermal stability (20 ppm/°C vs. ≥30 ppm/°C), lower dynamic impedance (0.05 Ω vs. ≥0.2 Ω), and "Green" halogen-free construction-making it optimal for high-reliability, thermally demanding industrial adapters and motherboards.
Availability
AZ431LBZTR-G1 is available at Aetrix Electronics and suitable for switching power supplies, PC motherboards, and voltage adapters requiring stable component supply, long-term lifecycle support, and RoHS/Green compliance.
Supply support for AZ431LBZTR-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.
The AZ431L series belongs to Diodes' precision reference product line, engineered specifically for high-stability, low-drift shunt regulation in cost-sensitive industrial and computing power systems-not automotive or safety-critical domains.
FAQ
What is the minimum cathode current required for regulation in AZ431LBZTR-G1?
The AZ431LBZTR-G1 requires a minimum cathode current (IKA(Min)) of 55 µA to maintain regulation at 25°C, rising to 80 µA over the full –40°C to +125°C range. This defines the upper limit of the feedback resistor divider's total resistance-typically ≤220 kΩ for 5 V output-to ensure reliable startup and regulation under all conditions.
Can AZ431LBZTR-G1 replace a standard zener diode in existing designs?
Yes-AZ431LBZTR-G1 directly replaces zener diodes in feedback and reference roles, offering superior performance: 1.24 V minimum voltage (vs. common 3.3 V+ zeners), 20 ppm/°C tempco (vs. 5000+ ppm/°C for zeners), and 0.05 Ω dynamic impedance (vs. >10 Ω for zeners). No circuit redesign is needed beyond resistor value adjustment for target VOUT.
Is AZ431LBZTR-G1 qualified for automotive applications?
No-AZ431LBZTR-G1 is not AEC-Q100 qualified and is not manufactured in IATF 16949-certified facilities. Diodes explicitly states that automotive-grade variants require separate qualification and PPAP capability; this part is intended for industrial, computing, and consumer power applications only.
How does the ANODE pin (Pin 2) connection affect thermal performance?
Pin 2 (ANODE) is internally connected to the substrate and serves as the primary thermal conduction path in TO92. Leaving it unconnected increases thermal resistance by ~15%, while connecting it to ground improves heat dissipation-critical when operating near the 770 mW power limit. Layout best practice is to tie Pin 2 to a large copper pour for enhanced thermal management.
AZ431LBZTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- AZ431L
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 100 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 20ppm/°C Typical
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92
AZ431LBZTR-G1 FAQ
1.How can I place an order for AZ431LBZTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AZ431LBZTR-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 AZ431LBZTR-G1 reliable?
The price and inventory of AZ431LBZTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AZ431LBZTR-G1 is usually 5 days.
3.What payment methods are accepted for AZ431LBZTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AZ431LBZTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AZ431LBZTR-G1?
AZ431LBZTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AZ431LBZTR-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 AZ431LBZTR-G1?
For technical support, including AZ431LBZTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AZ431LBZTR-G1 requirements.
6.How does Aetrix verify that AZ431LBZTR-G1 is sourced from the original manufacturer or authorized distributors?
All AZ431LBZTR-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 AZ431LBZTR-G1 meets industry standards.
7.What is the process for return or replacement of AZ431LBZTR-G1?
All AZ431LBZTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AZ431LBZTR-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 AZ431LBZTR-G1 part is unused and in its original packaging.
Return procedure for AZ431LBZTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AZ431LBZTR-G1 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
