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Diodes Incorporated ZR2431G01TA
- Part No.:
- ZR2431G01TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
ZR2431G01TA.pdf
- Description:
- IC VREF SHUNT PREC ADJ SOT-223
- Quantity:
- Payment:
- Shipping:
Inventory:4,527
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Product details
Overview
ZR2431G01TA from Zetex Semiconductors (now Diodes Incorporated) is a three-terminal adjustable precision shunt regulator with 1% initial reference voltage tolerance, 52 ppm/°C max temperature coefficient, and 100 µA–25 mA cathode current sink capability. It functions as a programmable 1.24 V bandgap reference in feedback loops of switch-mode power supplies, enabling accurate 3.3 V or 3 V output regulation via external resistor dividers.
For engineers reviewing the ZR2431G01TA datasheet, ZR2431G01TA pinout, ZR2431G01TA application, or ZR2431G01TA equivalent, key selection criteria include its 1% Vref tolerance, SOT223-4 package with pin 4 floating or tied to cathode, low 0.25–2 Ω dynamic impedance, and suitability for voltage monitoring, over/under-voltage protection, and series regulator topologies.
Technical Context
The ZR2431G01TA implements a temperature-compensated bandgap reference core with internal error amplifier and output stage, operating as a two-input (Vref, cathode), one-output (anode) shunt device. Its reference voltage is stable across −40°C to +85°C, with deviation ≤8 mV over full temperature range and typical dynamic impedance of 0.25 Ω at 10 mA.
It requires external resistive feedback to set output voltage between 1.24 V and 15 V, and exhibits stable operation with ≥100 pF cathode–anode capacitance. Minimum cathode current for regulation is 30 µA (typical), rising to 0.2 mA if cathode–anode capacitance exceeds 100 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1% - precise, factory-trimmed bandgap reference enabling accurate voltage setting in feedback networks |
| Temp Coefficient | ≤52 ppm/°C - ensures <±8 mV total drift over −40°C to +85°C, critical for stable SMPS regulation |
| Cathode Current Range | 100 µA to 25 mA - supports wide load transient response and compatibility with low-power or high-current shunt designs |
| Dynamic Impedance | 0.25–2 Ω - defines AC regulation stiffness; lower values improve ripple rejection in feedback paths |
| Min Regulating Current | 30 µA (typ), 100 µA (max) - minimum cathode current required to maintain regulation, affects light-load stability |
| Output Noise | Low - enables clean reference for sensitive analog circuits without added filtering |
| Abs Max Cathode Voltage | 15 V - sets upper limit for programmable output voltage and safe operating area in overvoltage protection |
Pinout & Package
SOT223-4 package (suffix G); pin 4 is floating or internally connected to pin 2 (cathode) per manufacturer recommendation. Thermal pad on underside enhances power dissipation up to 2 W at 25°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current sink return path | Connected to system ground or low-impedance return; carries full cathode current |
| Cathode (Pin 2) | Output voltage node | Programmable output terminal; voltage set by R1/R2 divider referenced to Vref |
| Vref (Pin 3) | Precision reference input | 1.24 V internal reference point; connected to divider junction for feedback |
| Thermal Pad / Pin 4 | Thermal conduction / optional cathode tie | Enhances thermal performance; may be left floating or shorted to pin 2 for improved heat transfer |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage (1.24–15 V) | Enables single BOM part to support multiple output rails using only two external resistors |
| 1% initial Vref tolerance | Reduces need for post-assembly trimming and improves system-level accuracy without calibration |
| 52 ppm/°C max tempco | Ensures <±0.1% output variation over industrial temperature range, critical for unregulated input SMPS |
| 25 mA max cathode current | Supports direct drive of optocoupler LEDs or small-signal transistors in isolated feedback paths |
| Stable with ≥100 pF capacitive load | Permits use with standard ceramic bypass caps without phase-margin compensation |
Applications
| Switch-Mode Power Supply Feedback | Voltage Monitor |
|---|---|
Use Scenario: Primary-side feedback in isolated DC/DC converters using optocoupler-coupled error amplification. IC Role / Device Role / Timing Role: Adjustable shunt regulator providing precise 1.24 V reference to set output voltage via resistor divider; sinks cathode current proportional to output error. Use Value: Enables accurate 3.3 V or 5 V outputs with <±1% tolerance over line/load/temperature, replacing less stable zener diodes. | Use Scenario: Real-time detection of supply rail deviations beyond preset thresholds in microcontroller-based systems. IC Role / Device Role / Timing Role: Precision reference source for comparator inputs; configured as high/low limit detector using dual resistor dividers. Use Value: Delivers ±1% threshold accuracy across −40°C to +85°C, eliminating need for external voltage references or trimming. |
| Overvoltage Protection | Series Regulator Control |
Use Scenario: Clamping circuit that triggers shutdown or crowbar action when input voltage exceeds safe level. IC Role / Device Role / Timing Role: Shunt element in foldback or latch-based OVLO circuit; reference voltage sets trip point via R1/R2 network. Use Value: Provides fast, repeatable 15 V absolute clamp ceiling with <8 mV temperature drift, improving system reliability. | Use Scenario: External pass transistor control in linear regulators where higher current or adjustable output is required. IC Role / Device Role / Timing Role: Reference and error amplifier driving base/gate of NPN/MOSFET pass device; sets output as Vout = Vref × (1 + R1/R2). Use Value: Achieves <0.1% load regulation and low dropout behavior using low-cost discrete pass elements. |
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 | 2.495 V nominal reference, 0.5% tolerance, 92 ppm/°C max tempco, SO-8 package | Higher reference voltage limits minimum programmable output to ~2.5 V; better suited for 5 V+ rails | Select when higher Vref simplifies resistor ratios or tighter initial tolerance is required |
| AS431AZTR-E1 | 1.24 V reference, 1% tolerance, 100 ppm/°C max tempco, SOT-23 package | Same reference voltage but higher tempco reduces accuracy at temperature extremes; smaller footprint | Select for space-constrained designs where ±0.5% total error budget allows higher tempco |
Compared with TL431ACDBVR and AS431AZTR-E1, the ZR2431G01TA offers superior temperature stability (52 vs. 92/100 ppm/°C) and identical 1.24 V reference-making it optimal for low-voltage SMPS feedback where tight thermal drift and sub-3.3 V outputs are critical.
Availability
ZR2431G01TA is available at Aetrix Electronics and suitable for switch-mode power supply feedback, voltage monitoring, overvoltage protection, and series regulator control requiring stable component supply and guaranteed long-term sourcing.
Supply support for ZR2431G01TA 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
Zetex Semiconductors, now part of Diodes Incorporated, specializes in high-performance analog and discrete semiconductors for power management and signal conditioning.
The ZR2431 product line was designed specifically for precision shunt regulation in isolated power supply feedback loops and voltage supervision circuits demanding low drift and programmability.
FAQ
What is the function of Pin 4 in the SOT223 package?
Pin 4 is a thermal pad with no internal electrical connection; it may be left floating or soldered to a copper pour tied to Pin 2 (cathode) to improve thermal performance. It is not a signal pin and must not be used for voltage sensing or biasing.
Can ZR2431G01TA regulate below 1.24 V?
No. The internal bandgap reference is fixed at 1.24 V; the lowest programmable output is 1.24 V (achieved when R2 = 0 Ω). Output voltages below this require external level-shifting circuitry not supported by the device architecture.
How does cathode–anode capacitance affect minimum operating current?
With >100 pF cathode–anode capacitance, minimum cathode current rises from 30 µA to 0.2 mA to ensure stable regulation. This requirement prevents oscillation during startup or light-load conditions and must be verified in layout.
Is ZR2431G01TA RoHS compliant and halogen-free?
Yes. As a Diodes Incorporated product, ZR2431G01TA meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21, with material declarations available under Diodes' compliance portal.
ZR2431G01TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-261-4, TO-261AA
- Series:
- -
- Packaging:
- Digi-Reel®
- Product Status:
- Obsolete
- Reference Type:
- -
- Output Type:
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Tolerance:
- -
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
ZR2431G01TA FAQ
1.How can I place an order for ZR2431G01TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZR2431G01TA 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 ZR2431G01TA reliable?
The price and inventory of ZR2431G01TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR2431G01TA is usually 5 days.
3.What payment methods are accepted for ZR2431G01TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR2431G01TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZR2431G01TA?
ZR2431G01TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZR2431G01TA 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 ZR2431G01TA?
For technical support, including ZR2431G01TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR2431G01TA requirements.
6.How does Aetrix verify that ZR2431G01TA is sourced from the original manufacturer or authorized distributors?
All ZR2431G01TA 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 ZR2431G01TA meets industry standards.
7.What is the process for return or replacement of ZR2431G01TA?
All ZR2431G01TA units undergo pre-shipment inspection (PSI). If there is an issue with ZR2431G01TA, 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 ZR2431G01TA part is unused and in its original packaging.
Return procedure for ZR2431G01TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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