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Diodes Incorporated ZTL431ASE5TA
- Part No.:
- ZTL431ASE5TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ZTL431ASE5TA.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:2,536
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Product details
Overview
ZTL431ASE5TA from Diodes Incorporated is a three-terminal adjustable precision shunt regulator in SOT25 package, delivering 2.5V reference voltage with ±1% initial tolerance (A grade), 0.2Ω typical dynamic output impedance, and 1mA–100mA sink current capability across –40°C to +125°C. It replaces discrete Zener diodes in feedback loops of linear regulators, opto-coupler-based isolated power supplies, and overvoltage protection circuits.
For engineers reviewing the ZTL431ASE5TA datasheet, ZTL431ASE5TA pinout, ZTL431ASE5TA application, or ZTL431ASE5TA equivalent, this device supports precise voltage setting from 2.5V to 20V via external resistor dividers, offers stable operation up to 20V cathode-anode voltage, and maintains low temperature drift (±14mV over –40°C to +125°C) - critical for industrial power monitoring and analog sensing designs.
Technical Context
The ZTL431ASE5TA functions as a programmable shunt reference with internal bandgap reference and error amplifier driving an NPN output transistor. Its regulation relies on feedback applied to the REF pin, where VREF = 2.5V is compared against the resistor-divider voltage to control cathode current.
It achieves stability with ≥4.7nF anode-to-cathode capacitance and exhibits <2.7mV/V cathode voltage sensitivity (ΔVREF/ΔVK A) - enabling robust performance in noisy DC-DC feedback paths and isolated flyback controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5V ±1% at +25°C - sets minimum output voltage threshold in adjustable regulator designs |
| Cathode-Anode Voltage Range | 2.5V to 20V - enables use in 3.3V–19V systems without external clamping |
| Sink Current Range | 1mA to 100mA - supports direct drive of optocoupler LEDs or biasing of secondary-side controllers |
| Dynamic Output Impedance | 0.2Ω typical - ensures minimal load-induced reference voltage shift in high-gain feedback networks |
| Temperature Range | –40°C to +125°C - qualified for under-hood automotive and industrial motor control environments |
| Reference Input Current | 2μA typical - reduces divider resistor power loss and thermal drift in precision applications |
| Output Voltage Adjustment | 2.5V to 20V via R1/R2 divider - allows single-part reuse across multiple output rails in multi-voltage systems |
Pinout & Package
Package: SOT25 (5-pin, surface-mount), 3.0mm × 2.8mm footprint, 0.95mm height, thermal resistance 250°C/W (TJA).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Reference ground node | Common return path for REF and cathode current; must connect to system ground or lowest potential point |
| Cathode (Pin 2) | Current sink output | Drives external load (e.g., optocoupler LED); voltage here determines regulation point |
| Ref (Pin 3) | Feedback input | Compares external resistor-divider voltage to internal 2.5V reference; high-impedance (2μA max) |
| N/C (Pin 4) | No connection | Internally unconnected; must remain floating per datasheet - not tied to any net |
| N/C (Pin 5) | No connection | Internally unconnected; electrically isolated - no routing or grounding permitted |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reference range | 2.5V to 20V via two external resistors - eliminates need for multiple fixed-voltage references |
| Low output impedance | 0.2Ω typical - minimizes output voltage variation under dynamic load transients |
| Wide operating temperature | –40°C to +125°C ambient - supports deployment in engine control units and industrial PLCs |
| Stability with capacitive loads | Stable with ≥4.7nF anode–cathode capacitor - simplifies layout in isolated SMPS feedback paths |
| Lead-free & green compliance | Fully RoHS-compliant, halogen- and antimony-free - meets IPC-1752A Tier 1 reporting requirements |
Applications
| Opto-Coupler Linearization | Linear Regulator Feedback |
|---|---|
|
Use Scenario: Isolated feedback loop in flyback or forward converters using PC817 or similar optocouplers. IC Role / Device Role / Timing Role: Shunt regulator provides stable 2.5V reference to bias optocoupler LED, linearizing CTR vs. current curve. Use Value: Reduces output voltage drift to ±1.5% over line/load/temperature versus ±5% with Zener-based solutions. |
Use Scenario: Adjustable output voltage in low-noise LDOs or discrete series pass regulators. IC Role / Device Role / Timing Role: Precision shunt reference sets feedback voltage for error amplifier, enabling 3.3V/5V/12V selection via resistor change. Use Value: Enables single-BOM flexibility across multiple product variants while maintaining ±1% output accuracy. |
| Overvoltage Protection Circuit | Variable Reference Source |
|
Use Scenario: Monitoring 12V battery rail in automotive body control modules to trigger shutdown above 15.5V. IC Role / Device Role / Timing Role: Configured as comparator with hysteresis; REF pin senses scaled battery voltage, cathode drives MOSFET gate. Use Value: Achieves trip threshold accuracy of ±0.15V (1%) without trimming, replacing discrete op-amp + Zener solutions. |
Use Scenario: Programmable threshold in analog comparators for sensor signal conditioning (e.g., temperature or pressure thresholds). IC Role / Device Role / Timing Role: Provides user-adjustable reference voltage to LM393 or TLV3701 comparator inputs. Use Value: Allows field calibration via resistor change instead of component replacement - reducing service inventory costs. |
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 | Same 2.5V reference, but 36V max cathode-anode rating vs. ZTL431ASE5TA's 20V; 0.3Ω typical RZ | Supports higher-voltage industrial rails (e.g., 24V PoE PSE); less suitable for space-constrained SOT25 layouts | Choose when >20V operation required and SOT23-5 footprint acceptable |
| ZTL431BSE5TA | Identical SOT25 package and pinout, but 0.5% reference tolerance (B grade) and tighter temp drift (±14mV) | Used where reference accuracy dominates system error budget - e.g., precision ADC references or metrology | Choose when ±0.5% initial tolerance and lower temp coefficient justify cost premium |
Compared with TL431ACDBVR, ZTL431ASE5TA offers lower profile and better thermal resistance in SOT25, but limits max cathode voltage to 20V; versus ZTL431BSE5TA, it trades 0.5% tolerance for lower unit cost in non-critical voltage-setting roles.
Availability
ZTL431ASE5TA is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and isolated DC-DC converters requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for ZTL431ASE5TA 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, specializing in high-reliability power management, signal integrity, and protection devices for industrial and automotive markets.
ZTL431ASE5TA belongs to Diodes' precision shunt regulator product line, engineered for cost-sensitive yet thermally demanding applications where Zener diode limitations in accuracy and stability must be overcome.
FAQ
What is the maximum cathode-anode voltage for ZTL431ASE5TA?
The absolute maximum cathode-to-anode voltage (VK A) is 20V, with recommended operating range from VREF (2.5V) to 20V. Exceeding 20V risks permanent damage. This limit is lower than TL431's 36V rating, making ZTL431ASE5TA suitable for 3.3V–19V systems but not 24V+ rails.
Can pins 4 and 5 be connected to ground or left unconnected?
Pins 4 and 5 are internally unconnected (N/C) and must remain floating - neither grounded nor tied to any net. Connecting them may cause unpredictable behavior or increased leakage. The datasheet explicitly states "must be left floating or connected to pin 5" only for ZTL431_H6 (SOT363), not for SOT25 variants like ZTL431ASE5TA.
How does ZTL431ASE5TA differ from ZTL432ASE5TA?
ZTL432ASE5TA has identical electrical specs but reversed pinout: Anode and Cathode swap positions in SOT25. ZTL431ASE5TA uses Pin 1=Anode, Pin 2=Cathode, Pin 3=Ref; ZTL432ASE5TA uses Pin 1=Cathode, Pin 2=Anode, Pin 3=Ref. PCB layout and schematic symbols must be updated accordingly - not drop-in compatible.
Is external compensation required for stability in feedback applications?
Yes - a minimum 4.7nF capacitor between anode and cathode is recommended to ensure stability across all load conditions, especially with capacitive loads >100pF. Without it, oscillation may occur near 10kHz–100kHz due to phase margin degradation, as shown in the stability boundary chart on page 4 of DS33263.
ZTL431ASE5TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- SC-74A, SOT-753
- 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:
- ±1%
- Temperature Coefficient:
- 48ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 600 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-25
ZTL431ASE5TA FAQ
1.How can I place an order for ZTL431ASE5TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTL431ASE5TA 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 ZTL431ASE5TA reliable?
The price and inventory of ZTL431ASE5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTL431ASE5TA is usually 5 days.
3.What payment methods are accepted for ZTL431ASE5TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTL431ASE5TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTL431ASE5TA?
ZTL431ASE5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTL431ASE5TA 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 ZTL431ASE5TA?
For technical support, including ZTL431ASE5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTL431ASE5TA requirements.
6.How does Aetrix verify that ZTL431ASE5TA is sourced from the original manufacturer or authorized distributors?
All ZTL431ASE5TA 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 ZTL431ASE5TA meets industry standards.
7.What is the process for return or replacement of ZTL431ASE5TA?
All ZTL431ASE5TA units undergo pre-shipment inspection (PSI). If there is an issue with ZTL431ASE5TA, 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 ZTL431ASE5TA part is unused and in its original packaging.
Return procedure for ZTL431ASE5TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZTL431ASE5TA Tags
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TL431AIDBZR
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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