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Diodes Incorporated ZR431GTC
- Part No.:
- ZR431GTC
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
ZR431GTC.pdf
- Description:
- IC VREF SHUNT ADJ 2% SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:1,946
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Product details
Overview
ZR431GTC from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 2% initial reference voltage tolerance, 55 ppm/°C max temperature coefficient, and 100mA 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 ZR431GTC datasheet, ZR431GTC pinout, ZR431GTC application, or ZR431GTC equivalent, key selection criteria include programmable output (2.5–20 V), low dynamic impedance (0.75 Ω), ±8 mV reference voltage drift over –40°C to +85°C, and SOT223 package thermal performance for stable regulation under load transients.
Technical Context
The ZR431GTC operates as a two-input, one-output shunt regulator: the reference input (REF) senses voltage via external resistor divider, while the cathode (K) sinks current to maintain regulated output. Its internal bandgap reference and error amplifier enable precise voltage setpoint control independent of cathode voltage variation.
It exhibits negative cathode voltage sensitivity (–1.85 to –2.7 mV/V), meaning output voltage decreases slightly as cathode voltage rises-critical for stability analysis in feedback networks. Minimum regulation current is 35 µA, enabling low-power monitoring circuits without compromising regulation accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.50 V (typ), ±2% initial tolerance - sets base regulation point for external resistor programming |
| Temp Coefficient | ≤55 ppm/°C - ensures ≤±8 mV drift across –40°C to +85°C operating range |
| Cathode Current | 50 µA to 100 mA - supports both ultra-low-power sensing and high-current shunt regulation |
| Dynamic Impedance | 0.75 Ω - provides tight output regulation under fast load transients |
| Max Cathode Voltage | 20 V - defines upper limit for programmable output range (2.5–20 V) |
| Min Regulation Current | 35 µA - enables reliable startup and regulation in low-quiescent circuits |
| Package Power Dissipation | 2 W (SOT223) - allows >100 mA sink at moderate ambient temperatures without heatsink |
Pinout & Package
SOT223 package (suffix G), thermally enhanced surface-mount outline with exposed thermal pad; pin 4 is floating or internally connected to pin 2 (cathode) per manufacturer diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Ground reference | Common return path for reference divider and internal bias network |
| Pin 2 (Cathode) | Current sink output | Primary regulation node; connects to supply rail or feedback point in SMPS |
| Pin 3 (Ref) | Reference input | Senses divided output voltage; triggers regulation when ≥2.5 V |
| Pin 4 (Thermal Pad) | Thermal conduction | Not electrically connected; must be soldered to PCB copper for 2 W dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output range | 2.5 V to 20 V via two external resistors - eliminates need for multiple fixed Zeners |
| Low output noise | Sub-mV RMS noise - critical for precision voltage monitoring and comparator threshold stability |
| Temperature compensation | Full-range operation (–40°C to +85°C) with <±8 mV Vref drift - no external trimming required |
| High current sink capability | 100 mA continuous cathode current - supports direct drive of optocoupler LEDs in isolated SMPS feedback |
| Stable with capacitive loads | Compatible with ≥100 pF output capacitance - simplifies EMI filtering without oscillation risk |
Applications
| SMPS Feedback Regulation | Voltage Monitor Circuit |
|---|---|
Use Scenario: Primary-side feedback in isolated flyback converters using optocoupler-coupled secondary regulation. IC Role / Device Role / Timing Role: Shunt regulator providing precise 2.5 V reference to drive optocoupler LED; cathode current modulates isolation barrier signal. Use Value: Enables ±1% output voltage accuracy over line/load/temperature without secondary-side controller. | Use Scenario: Undervoltage lockout (UVLO) and overvoltage detection in battery-powered microcontroller systems. IC Role / Device Role / Timing Role: Programmable threshold generator comparing system rail against resistor-divided ZR431GTC output. Use Value: Delivers stable trip points (e.g., 2.7 V UVLO, 5.8 V OVP) with <±0.1 V error across –40°C to +85°C. |
| Programmable Series Regulator | Three-Terminal Regulator Enhancement |
Use Scenario: Boosting output voltage and improving line regulation of fixed LDOs (e.g., 3.3 V part) using external pass transistor. IC Role / Device Role / Timing Role: Adjustable reference source controlling base/gate of series pass element; REF pin sets target output. Use Value: Extends fixed regulator range to 12 V while maintaining <0.5% load regulation and thermal shutdown compatibility. | Use Scenario: Improving accuracy and temperature stability of legacy 78xx-series linear regulators in industrial power supplies. IC Role / Device Role / Timing Role: Precision shunt replacing internal Zener in feedback path of adjustable regulator ICs (e.g., LM317). Use Value: Reduces output voltage drift from ±2% to ±0.5% over temperature by substituting low-TC reference. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVR | 2.495 V ref (±0.5%), 92 ppm/°C max TC, SO-8 package, 100 mA sink | Higher precision but higher tempco; requires larger PCB area | Preferred where tighter initial tolerance outweighs thermal drift penalty |
| KIA431AP | 2.5 V ref (±2%), 100 ppm/°C max TC, TO-92 package, 100 mA sink | Through-hole mounting, lower thermal performance, same tolerance grade | Used in cost-sensitive, non-thermal-critical legacy designs |
Compared with TL431CDBVR and KIA431AP, ZR431GTC offers superior thermal stability (55 vs. 92/100 ppm/°C) in a compact SOT223 package, making it optimal for space-constrained, wide-temperature industrial power monitors where long-term drift matters more than initial calibration tolerance.
Availability
ZR431GTC is available at Aetrix Electronics and suitable for switch-mode power supply feedback, voltage monitoring, over/under-voltage protection, and programmable series regulation requiring stable component supply across automotive, industrial, and telecom power systems.
Supply support for ZR431GTC 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.
ZR431GTC belongs to Diodes' precision shunt regulator product line, designed specifically for high-stability voltage reference and regulation in power conversion, protection, and monitoring circuits where Zener replacement with improved TC and noise performance is required.
FAQ
What is the minimum cathode current required for regulation in ZR431GTC?
The ZR431GTC requires a minimum cathode current of 35 µA to maintain regulation, as specified in the Electrical Characteristics table under "Minimum Cathode Current for Regulation." This value is measured at VZ = Vref and ensures stable reference operation even in ultra-low-power monitoring circuits where external resistor dividers draw minimal current.
Can ZR431GTC replace a standard 5.1 V Zener diode directly?
Yes, ZR431GTC can replace a 5.1 V Zener by configuring R1 and R2 to set VOUT = 5.1 V using the formula VOUT = Vref × (1 + R1/R2). Unlike a Zener, it requires three connections (anode, cathode, ref) and delivers superior temperature stability (55 ppm/°C vs. typical 5000 ppm/°C for Zeners) and tighter initial tolerance (2% vs. ±5–10%).
What is the maximum power dissipation of ZR431GTC in SOT223 package?
The ZR431GTC in SOT223 package has a maximum power dissipation of 2 W at Tamb = 25°C, as stated in the Recommended Operating Conditions table. This assumes proper PCB copper area for thermal conduction via the exposed thermal pad (pin 4), which must be soldered to a ≥1 cm² copper pour to achieve full rating.
Does ZR431GTC require an external capacitor for stability?
No external capacitor is required for basic DC regulation stability. The device remains stable with output capacitance up to 100 pF, as confirmed in Typical Characteristics plots. For high-frequency noise suppression or EMI filtering, ceramic capacitors ≤1 nF may be added directly at the cathode without risk of oscillation due to its inherent phase margin design.
ZR431GTC 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
ZR431GTC FAQ
1.How can I place an order for ZR431GTC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZR431GTC 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 ZR431GTC reliable?
The price and inventory of ZR431GTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR431GTC is usually 5 days.
3.What payment methods are accepted for ZR431GTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR431GTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZR431GTC?
ZR431GTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZR431GTC 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 ZR431GTC?
For technical support, including ZR431GTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR431GTC requirements.
6.How does Aetrix verify that ZR431GTC is sourced from the original manufacturer or authorized distributors?
All ZR431GTC 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 ZR431GTC meets industry standards.
7.What is the process for return or replacement of ZR431GTC?
All ZR431GTC units undergo pre-shipment inspection (PSI). If there is an issue with ZR431GTC, 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 ZR431GTC part is unused and in its original packaging.
Return procedure for ZR431GTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZR431GTC Tags
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LM4040DIM3X-2.5/NOPB
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