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Diodes Incorporated ZR431GTA
- Part No.:
- ZR431GTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
ZR431GTA.pdf
- Description:
- IC VREF SHUNT ADJ 2% SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:4,368
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Product details
Overview
ZR431GTA from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 2% initial reference voltage tolerance, 55 ppm/°C max temperature coefficient, and 100 mA cathode current capability; it replaces standard Zener diodes in voltage monitoring, over/under-voltage protection, and switch-mode power supply feedback loops.
For engineers reviewing the ZR431GTA datasheet, ZR431GTA pinout, ZR431GTA application, or ZR431GTA equivalent, key selection criteria include programmable output (2.5–20 V), low dynamic impedance (0.75 Ω), stable operation across –40°C to +85°C, and SOT223 package thermal performance for high-current shunt regulation.
Technical Context
The ZR431GTA implements an internal bandgap reference and error amplifier driving an NPN pass transistor, enabling precise voltage regulation via external resistor dividers. Its cathode current sink ranges from 50 µA to 100 mA, with minimum regulation current of 35 µA at VZ = VREF.
It features temperature-compensated reference voltage (2.50 V typical), low output noise, and dynamic output impedance of 0.75 Ω at DC - critical for stable feedback in isolated flyback converters and precision voltage monitors where load transients demand fast regulation response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.50 V ±2% at IL = 10 mA - sets base accuracy for programmable output voltage |
| Tempco (Max) | 55 ppm/°C - ensures ≤±8.0 mV drift over –40°C to +85°C for stable threshold detection |
| Cathode Current Range | 50 µA to 100 mA - supports both low-power monitoring and high-current shunt regulation |
| Dynamic Output Impedance | 0.75 Ω at DC - minimizes output voltage perturbation under fast load steps in SMPS feedback paths |
| Min Cathode Current | 35 µA - enables regulation start-up with minimal bias current in battery-powered monitors |
| Output Voltage Range | 2.5 V to 20 V - programmable via two external resistors without additional ICs or DACs |
| Power Dissipation (SOT223) | 2 W at Tamb = 25°C - allows >150 mW continuous dissipation in compact surface-mount designs |
Pinout & Package
SOT223-3 package (suffix G), thermally enhanced surface-mount outline with exposed thermal pad; pin 4 is floating or internally connected to pin 2 per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Current sink node | Accepts up to 100 mA sink current; connects to positive rail in shunt configuration |
| Anode (Pin 2) | Ground reference | Return path for reference current and cathode current; ties to system ground |
| Reference (Pin 3) | Feedback input | High-impedance (≤1 µA) input sensing divider voltage; sets regulation point |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2.5–20 V via two external resistors - eliminates need for multiple fixed Zeners or trimming potentiometers |
| Low reference current | 0.12–1.0 µA typical - reduces divider power loss and improves battery life in portable voltage monitors |
| Stable over full temp range | Specified from –40°C to +85°C - enables use in automotive cabin and industrial control environments |
| Low dynamic impedance | 0.75 Ω at DC - maintains tight output regulation during rapid load changes in SMPS feedback networks |
| Multiple package options | SOT223 (2 W), SO8 (780 mW), TO92 (780 mW), SOT23 (330 mW) - supports thermal and layout flexibility across power classes |
Applications
| Switch-Mode Power Supply Feedback | Voltage Monitor / Threshold Detector |
|---|---|
Use Scenario: Isolated flyback converter secondary-side voltage sensing with optocoupler feedback. IC Role / Device Role / Timing Role: Adjustable shunt regulator providing precise, temperature-stable reference for optocoupler LED drive current. Use Value: Enables ±1% output regulation over line, load, and temperature without secondary-side LDO or TL431-level complexity. | Use Scenario: Battery voltage supervision in portable medical devices with low-power wake-up logic. IC Role / Device Role / Timing Role: Programmable threshold detector comparing battery voltage against user-defined low/high limits. Use Value: Achieves <1 µA quiescent current in off-state while maintaining 55 ppm/°C threshold stability for reliable undervoltage lockout. |
| Overvoltage Protection Circuit | Series Regulator Reference |
Use Scenario: Input rail clamping for FPGA or microcontroller power domains subjected to transient surges. IC Role / Device Role / Timing Role: Fast-responding shunt element triggering crowbar or shutdown when VIN exceeds set threshold. Use Value: Delivers 100 mA sink capacity and sub-100 ns response to transients, limiting overvoltage excursions to <50 mV above trip point. | Use Scenario: High-accuracy linear post-regulation stage following a switching pre-regulator in test equipment supplies. IC Role / Device Role / Timing Role: Precision reference source for series-pass transistor base drive in discrete LDO architecture. Use Value: Provides 2.50 V ±2% reference with 0.75 Ω dynamic impedance, reducing output ripple by >20 dB vs. standard Zener-based designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDR | 2.495 V reference, 50 ppm/°C tempco, 100 mA sink, SO8 package | Higher initial accuracy (0.5%), tighter tempco, but higher minimum cathode current (100 µA) | Preferred where <1% total error budget required and board space permits SO8 footprint |
| AS431AT | 2.50 V reference, 2% tolerance, 100 ppm/°C tempco, SOT23-3 | Same tolerance and pinout as ZR431GTA, but higher tempco and lower power rating (300 mW) | Drop-in replacement only in low-power, non-automotive applications with relaxed thermal requirements |
Compared with TL431ACDR and AS431AT, the ZR431GTA offers superior thermal performance in SOT223 (2 W), lower minimum cathode current (35 µA), and tighter tempco than AS431AT - making it optimal for high-reliability, medium-power shunt regulation where thermal headroom and low-startup-current matter.
Availability
ZR431GTA is available at Aetrix Electronics and suitable for switch-mode power supply feedback, overvoltage protection circuits, and precision voltage monitoring requiring stable component supply across automotive, industrial, and medical electronics programs.
Supply support for ZR431GTA 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 ZR431GTA belongs to Diodes' precision shunt regulator product line, designed specifically for cost-sensitive, high-reliability applications demanding stable voltage references without complex support circuitry.
FAQ
What is the minimum cathode current required for regulation in ZR431GTA?
The ZR431GTA requires a minimum cathode current of 35 µA to maintain regulation at VZ = VREF, as specified in the Absolute Maximum Ratings table. This low startup current enables reliable operation in battery-powered voltage monitors and low-quiescent circuits where bias current must be minimized.
Can ZR431GTA replace a standard Zener diode directly?
Yes - ZR431GTA can replace standard Zener diodes in shunt regulator and voltage reference roles, but requires two external resistors to set output voltage. Unlike passive Zeners, it provides superior temperature stability (55 ppm/°C), lower dynamic impedance (0.75 Ω), and programmable voltage (2.5–20 V) without sacrificing simplicity.
What is the maximum power dissipation of ZR431GTA in SOT223 package?
In SOT223 package, ZR431GTA has a maximum power dissipation of 2 W at ambient temperature of 25°C and junction temperature limit of 150°C. Derating is required above 25°C at 16.7 mW/°C, per the thermal resistance specification (RθJA = 60°C/W).
Does ZR431GTA require an external capacitor for stability?
No external capacitor is required for basic DC regulation. However, a 0.01 µF ceramic capacitor between cathode and anode is recommended in high-frequency SMPS feedback applications to suppress ringing and improve phase margin, as shown in the Application Circuits section of the datasheet.
ZR431GTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-261-4, TO-261AA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 20 V
- Current - Output:
- 100 mA
- Tolerance:
- ±2%
- Temperature Coefficient:
- 55ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 50 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
ZR431GTA FAQ
1.How can I place an order for ZR431GTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZR431GTA 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 ZR431GTA reliable?
The price and inventory of ZR431GTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR431GTA is usually 5 days.
3.What payment methods are accepted for ZR431GTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR431GTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZR431GTA?
ZR431GTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZR431GTA 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 ZR431GTA?
For technical support, including ZR431GTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR431GTA requirements.
6.How does Aetrix verify that ZR431GTA is sourced from the original manufacturer or authorized distributors?
All ZR431GTA 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 ZR431GTA meets industry standards.
7.What is the process for return or replacement of ZR431GTA?
All ZR431GTA units undergo pre-shipment inspection (PSI). If there is an issue with ZR431GTA, 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 ZR431GTA part is unused and in its original packaging.
Return procedure for ZR431GTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZR431GTA Tags
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TL431AIDBZR
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TL431BQDBZR
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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
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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
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