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Diodes Incorporated ZTL431BQE5TA
- Part No.:
- ZTL431BQE5TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ZTL431BQE5TA.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:4,300
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Product details
Overview
ZTL431BQE5TA from Diodes Incorporated is an automotive-grade adjustable precision shunt regulator in SOT25 package, featuring 0.5% initial reference voltage tolerance (2.5 V ±13 mV), -40°C to +125°C operating range, 0.2 Ω typical dynamic output impedance, and 1–100 mA cathode sink current capability. It serves as a programmable voltage reference in feedback loops of isolated DC-DC converters and overvoltage protection circuits.
For engineers reviewing the ZTL431BQE5TA datasheet, ZTL431BQE5TA pinout, ZTL431BQE5TA application, or ZTL431BQE5TA equivalent, key selection criteria include AEC-Q100 Grade 1 qualification, SOT25 thermal performance (θJA = 250°C/W, PDIS = 400 mW), stability with ≥4.7 nF anode–cathode capacitance, and compatibility with TL431-based designs requiring extended temperature and automotive compliance.
Technical Context
The ZTL431BQE5TA implements a bandgap-referenced error amplifier driving an NPN output stage, enabling precise regulation via external resistor divider between cathode and reference pins. Its internal architecture delivers low drift (≤34 mV deviation over -40°C to +125°C) and high PSRR against cathode voltage variation (ΔVREF/ΔVK A ≤ -2.7 mV/V).
It operates as a 3-terminal shunt regulator with active current sinking: reference pin senses divided output voltage, cathode sinks load current up to 100 mA, and anode connects to system ground or return path. Stability is maintained with ≥4.7 nF capacitor across anode–cathode, avoiding the instability zone observed at 10 pF–100 nF loads below 100 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.5 V ±13 mV at +25°C - sets minimum programmable output voltage and defines accuracy baseline for resistor-divider design |
| VKA Range | 2.5 V to 20 V - enables adjustable regulation across industrial and automotive supply rails without external series pass devices |
| RZ | 0.2 Ω typical - ensures tight output regulation under dynamic load steps and minimizes voltage droop during transient sink current changes |
| IK A | 1–100 mA continuous sink - supports direct interface with optocoupler LEDs and medium-power error amplifiers without buffering |
| TA Range | -40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood and powertrain control module applications |
| θJA | 250°C/W (SOT25) - allows 400 mW max power dissipation at +25°C ambient, supporting 100 mA sink at 4 V cathode-anode differential |
Pinout & Package
SOT25 package: 5-pin surface-mount plastic package with exposed thermal pad (pin 5), optimized for thermal performance in automotive PCB layouts. Pin 5 must be left floating or connected to anode (pin 1) per datasheet configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Reference return node | Connects to system ground or low-side return; forms cathode–anode voltage differential defining regulation range |
| 2 (Cathode) | Current sink output | Sinks regulated current to maintain VREF at pin 3; interfaces directly with optocoupler anode or error amplifier input |
| 3 (Ref) | Feedback sense input | High-impedance (2–4 µA IREF) input monitoring resistor divider; sets output voltage as VOUT = VREF(1 + R1/R2) |
| 4 (NC) | No connect | Internally unconnected; must remain unconnected on PCB to avoid parasitic coupling or latch-up risk |
| 5 (Thermal Pad) | Thermal conduction path | Exposed copper pad for soldering to PCB ground plane; improves thermal resistance by ~30% vs. standard SOT23 |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualified | Validated for automotive powertrain and body electronics with full PPAP support and IATF16949 manufacturing |
| 0.5% VREF tolerance | Reduces resistor-divider calibration burden and improves closed-loop accuracy in feedback-sensitive SMPS designs |
| Stable with ≥4.7 nF CAK | Enables robust operation with common ceramic decoupling caps; eliminates need for complex compensation networks |
| Green, halogen-free, RoHS-compliant | Meets EU Directive 2015/863/EU with Br+Cl <1500 ppm and Sb <1000 ppm - suitable for global automotive supply chains |
| Low 0.2 Ω dynamic impedance | Maintains <±5 mV regulation error during 50 mA load transients, critical for stable optocoupler bias in isolated flyback controllers |
Applications
| Isolated Flyback Converter Feedback | Automotive Overvoltage Protection |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in 12 V/48 V automotive DC-DC converters with optocoupler isolation. IC Role / Device Role / Timing Role: Adjustable shunt reference providing precise feedback to optocoupler LED, closing regulation loop across isolation barrier. Use Value: 0.5% VREF tolerance and -40°C to +125°C stability ensure ±1.5% output accuracy over full vehicle lifetime without recalibration. |
Use Scenario: Monitoring battery rail voltage in ADAS domain controllers to trigger shutdown above 16 V. IC Role / Device Role / Timing Role: Programmable threshold detector comparing divided battery voltage against internal 2.5 V reference. Use Value: 100 mA sink capability drives MOSFET gate directly, eliminating external driver and reducing BOM count by one active component. |
| Linear Regulator Error Amplifier | Industrial Sensor Reference |
|
Use Scenario: Precision voltage reference for LDO error amplifiers in engine control unit (ECU) power management ICs. IC Role / Device Role / Timing Role: Stable 2.5 V reference source for comparator-based feedback, replacing discrete Zener diodes. Use Value: 0.2 Ω output impedance ensures <1 mV error under 10 mA reference load, improving LDO line/load regulation by 3× vs. Zener solutions. |
Use Scenario: Excitation reference for RTD and bridge sensor interfaces in commercial vehicle telematics modules. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage reference supplying constant current to 4-wire sensor bridges. Use Value: ≤34 mV VREF deviation over -40°C to +125°C limits sensor offset error to <0.15% FS, meeting ISO 16750-4 environmental test requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBZR | 0.5% tolerance, SO-8 package, -40°C to +125°C, but not AEC-Q100 qualified; θJA = 170°C/W, PDIS = 600 mW | Lacks automotive qualification and SOT25 thermal pad; requires larger PCB area and additional qualification effort for automotive use | Select only for non-automotive industrial designs where AEC-Q100 is not required and SO-8 footprint is acceptable |
| ZTL431BQFTA | Same electrical specs and AEC-Q100 Grade 1 rating, but in SOT23 (3-pin) with no thermal pad; θJA = 380°C/W, PDIS = 260 mW | Lower power handling (260 mW vs. 400 mW); unsuitable for >65 mA continuous sink in high-ambient environments | Choose when board space is constrained and thermal load remains below 65 mA at +105°C ambient |
Compared with TL431BIDBZR and ZTL431BQFTA, ZTL431BQE5TA uniquely combines AEC-Q100 qualification, SOT25 thermal performance, and 400 mW power dissipation-enabling higher-reliability automotive feedback and protection circuits without derating or redesign.
Availability
ZTL431BQE5TA is available at Aetrix Electronics and suitable for automotive powertrain control, isolated DC-DC converter feedback, and battery overvoltage protection requiring stable component supply across extended temperature and long product lifecycles.
Supply support for ZTL431BQE5TA 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 components for automotive, industrial, and computing markets with IATF16949-certified facilities.
ZTL431BQE5TA belongs to Diodes' automotive-compliant precision reference family, designed specifically for AEC-Q100 Grade 1 applications demanding robustness in harsh under-hood environments and long-term parametric stability.
FAQ
What is the maximum cathode-to-anode voltage for ZTL431BQE5TA?
The absolute maximum cathode-to-anode voltage (VKA) is 20 V. Operation beyond this risks permanent damage. The recommended operating range is VREF to 20 V, with optimal stability achieved when VKA remains within 2.5 V to 16 V for automotive battery-sensed applications.
Can ZTL431BQE5TA replace TL431 in existing designs?
Yes, with minor layout adjustments: ZTL431BQE5TA matches TL431's electrical function and pinout in SOT25 (pins 1–3), but adds NC (pin 4) and thermal pad (pin 5). External resistor values remain identical; however, the ≥4.7 nF anode–cathode capacitor is mandatory for stability where TL431 may tolerate lower values.
How does the SOT25 thermal pad affect PCB layout?
The exposed thermal pad (pin 5) must be soldered to a dedicated PCB copper pour tied to the anode net (pin 1) or system ground. Minimum pad size is 3.2 mm × 1.6 mm per Diodes' SOT25 landing pattern; insufficient copper area degrades θJA and reduces safe operating current by up to 30% at +105°C ambient.
Is ZTL431BQE5TA compatible with lead-free reflow profiles?
Yes-it is fully RoHS 3 compliant (2015/863/EU) and rated for standard JEDEC J-STD-020D reflow profiles with peak temperature up to 260°C. The green molding compound withstands multiple reflow cycles without delamination, verified per AEC-Q200 stress testing for automotive production.
ZTL431BQE5TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 20 V
- Current - Output:
- 100 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 63ppm/°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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-25
ZTL431BQE5TA FAQ
1.How can I place an order for ZTL431BQE5TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTL431BQE5TA 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 ZTL431BQE5TA reliable?
The price and inventory of ZTL431BQE5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTL431BQE5TA is usually 5 days.
3.What payment methods are accepted for ZTL431BQE5TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTL431BQE5TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTL431BQE5TA?
ZTL431BQE5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTL431BQE5TA 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 ZTL431BQE5TA?
For technical support, including ZTL431BQE5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTL431BQE5TA requirements.
6.How does Aetrix verify that ZTL431BQE5TA is sourced from the original manufacturer or authorized distributors?
All ZTL431BQE5TA 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 ZTL431BQE5TA meets industry standards.
7.What is the process for return or replacement of ZTL431BQE5TA?
All ZTL431BQE5TA units undergo pre-shipment inspection (PSI). If there is an issue with ZTL431BQE5TA, 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 ZTL431BQE5TA part is unused and in its original packaging.
Return procedure for ZTL431BQE5TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZTL431BQE5TA Tags
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