My Inquiry
My Account
Texas Instruments TL431IDBZTG4
- Part No.:
- TL431IDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431IDBZTG4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,233
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TL431IDBZTG4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, delivering 2.495 V nominal reference voltage with ±0.5% initial tolerance (B-grade), 14 mV max temperature drift over −40°C to 125°C, and 0.2 Ω typical dynamic impedance. It operates as an adjustable feedback element in isolated DC-DC converters and linear regulators.
For engineers reviewing the TL431IDBZTG4 datasheet, TL431IDBZTG4 pinout, TL431IDBZTG4 application, or TL431IDBZTG4 equivalent, key selection criteria include its Q-temp grade automotive qualification, low output noise, sink-current capability up to 100 mA, and compatibility with standard resistor-divider programming for output voltages from 2.5 V to 36 V.
Technical Context
The TL431IDBZTG4 implements a high-gain transconductance amplifier with internal 2.495 V bandgap reference, comparing REF pin voltage to Vref and modulating cathode current to maintain regulation. Its sharp turn-on characteristic and low output impedance enable stable operation in switching power supply feedback loops without external compensation in many cases.
As a Q-grade device, TL431IDBZTG4 is characterized across −40°C to +125°C and features 14 mV max reference voltage deviation over temperature, 2–4 µA reference input current, and 0.4–0.7 mA minimum cathode current for regulation-enabling robust performance in automotive and industrial environments where thermal stability is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V nominal (2.483–2.507 V at 25°C, B-grade); sets precise feedback threshold for regulator ICs. |
| Initial Tolerance | ±0.5% at 25°C; enables tight output voltage control without post-manufacturing trimming. |
| Temp Range | −40°C to +125°C (Q-grade); qualified for under-hood automotive and industrial ambient conditions. |
| Dynamic Impedance | 0.2 Ω typical; ensures minimal output voltage shift under load transients in closed-loop systems. |
| Sink Current | 1–100 mA continuous; supports direct interface with optocoupler LEDs and error amplifier outputs. |
| Ref Input Current | 2–4 µA; allows use of high-value feedback resistors (>1 MΩ) to minimize power loss and bias error. |
| Temp Drift | 14 mV max over full range; translates to <100 ppm/°C typical, supporting <±1% output stability across temperature. |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free and RoHS-compliant. Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = Reference (REF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current output node | Connects to feedback network or optocoupler LED anode; sinks regulated current to maintain REF voltage. |
| Anode (Pin 2) | Common return/reference ground | Typically tied to system ground or power supply return; defines voltage reference point for REF and cathode. |
| REF (Pin 3) | High-impedance voltage sense input | Compares external divider voltage to internal 2.495 V reference; draws only 2–4 µA, minimizing divider loading. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Programmable from 2.5 V to 36 V using two external resistors-enables single BOM for multiple output rails. |
| Low output noise | Sub-20 µVRMS (0.1–10 Hz); preserves signal integrity in precision analog feedback paths. |
| Sharp turn-on characteristic | Fast response to REF voltage deviations (<1 µs rise time); prevents oscillation in high-bandwidth SMPS loops. |
| Automotive Q-grade qualification | Tested per AEC-Q100 Rev G; supports functional safety requirements in ASIL-B systems without additional qualification effort. |
| Low dynamic impedance | 0.2 Ω typical; maintains regulation accuracy even with 100 mA load steps, reducing need for bulk output capacitance. |
Applications
| AC/DC Power Supply Feedback | Isolated DC-DC Converter Regulation |
|---|---|
Use Scenario: Secondary-side voltage sensing in offline flyback or forward converters with optocoupler isolation. IC Role / Device Role / Timing Role: Shunt reference providing precise 2.5 V threshold to drive optocoupler LED, enabling primary-side PWM controller feedback. Use Value: Enables ±1% output voltage regulation across line/load/temperature with no secondary-side LDO required. | Use Scenario: Output voltage monitoring in telecom brick or server PSU modules requiring tight cross-regulation. IC Role / Device Role / Timing Role: Adjustable reference setting feedback point for error amplifier in multi-output isolated converters. Use Value: Allows independent tuning of each output rail via resistor dividers, eliminating need for multiple fixed references. |
| Automotive Body Control Module | Industrial Motor Drive Power Stage |
Use Scenario: Regulated auxiliary supply generation for microcontrollers and sensors in engine bay ECUs. IC Role / Device Role / Timing Role: Precision shunt reference in linear post-regulator stage following buck converter. Use Value: Maintains stable 3.3 V or 5 V supply despite wide battery voltage swings (6–16 V) and high ambient temperatures. | Use Scenario: Gate driver bias supply regulation in IGBT or SiC half-bridge drivers for servo inverters. IC Role / Device Role / Timing Role: Stable reference for isolated gate driver ICs requiring accurate undervoltage lockout thresholds. Use Value: Prevents false UVLO triggering during high dv/dt switching events due to low noise and fast transient response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBZR | Same SOT-23-3 package but C-grade (0°C to 70°C, ±2% tolerance); lower cost, non-automotive qualified. | Restricted to commercial-temperature consumer or computing power supplies; not suitable for under-hood use. | Select when ambient temperature stays below 70°C and ±2% output tolerance is acceptable. |
| TLVH431AQDBVRQ1 | Q-grade like TL431IDBZTG4 but with 1.24 V reference, lower 80 µA max cathode current, and 0.35 Ω impedance. | Better suited for low-voltage, low-power systems (e.g., 1.8 V/3.3 V rails); less headroom for high-VKA applications. | Choose when designing compact, low-IQ systems needing sub-2.5 V reference and automotive qualification. |
Compared with TL431CDBZR and TLVH431AQDBVRQ1, TL431IDBZTG4 uniquely balances automotive temperature range, ±0.5% precision, and 100 mA sink capability-making it optimal for high-reliability, high-accuracy isolated power feedback where both thermal robustness and tight regulation are mandatory.
Availability
TL431IDBZTG4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC, and automotive body control module designs requiring stable component supply with guaranteed long-term availability.
Supply support for TL431IDBZTG4 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of leadership in precision reference design.
The TL431 product line was engineered for high-accuracy, low-drift voltage regulation in power management systems-targeting automotive, industrial, and telecom infrastructure applications demanding reliability across extreme temperatures.
FAQ
What is the reference voltage tolerance of TL431IDBZTG4 at 25°C?
The TL431IDBZTG4 has a ±0.5% initial reference voltage tolerance at 25°C (B-grade specification), corresponding to a 2.483–2.507 V range. This tight tolerance is confirmed in Section 6.11 of the TI SLVS543S datasheet and enables high-accuracy feedback without calibration. The TL431IDBZTG4 maintains this precision across its full −40°C to +125°C operating range.
Does TL431IDBZTG4 support operation above 85°C?
Yes, TL431IDBZTG4 is a Q-grade device rated for continuous operation from −40°C to +125°C, making it suitable for under-hood automotive and high-temperature industrial environments. Its maximum junction temperature is 150°C, and thermal resistance (RθJA) is 206°C/W in the SOT-23-3 package-allowing safe dissipation up to ~300 mW at 85°C ambient.
What is the minimum cathode current required for regulation in TL431IDBZTG4?
The TL431IDBZTG4 requires a minimum cathode current of 0.4–0.7 mA to maintain regulation, per Section 6.12 of the datasheet. This value is lower than standard-grade TL431 variants and ensures stable operation even with high-value feedback resistors or low-power optocouplers, reducing standby power consumption in always-on systems.
Can TL431IDBZTG4 replace a Zener diode in voltage regulation circuits?
Yes, TL431IDBZTG4 is explicitly designed as a superior replacement for Zener diodes in shunt regulation applications. Its 0.2 Ω dynamic impedance, sharp turn-on, and 2.495 V reference provide significantly better voltage stability, lower temperature drift, and programmable output (2.5–36 V) compared to discrete Zeners-especially in switching power supply feedback networks.
What are the absolute maximum ratings for cathode voltage and current in TL431IDBZTG4?
The TL431IDBZTG4 has an absolute maximum cathode voltage (VKA) of 37 V and continuous cathode current (IKA) of ±100 mA. Exceeding these limits risks permanent damage. Recommended operating conditions specify VKA from Vref to 36 V and IKA from 1 mA to 100 mA-ensuring reliable long-term performance within the Q-grade temperature range.
TL431IDBZTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±2.2%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 1 mA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL431IDBZTG4 FAQ
1.How can I place an order for TL431IDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431IDBZTG4 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 TL431IDBZTG4 reliable?
The price and inventory of TL431IDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431IDBZTG4 is usually 5 days.
3.What payment methods are accepted for TL431IDBZTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431IDBZTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431IDBZTG4?
TL431IDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431IDBZTG4 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 TL431IDBZTG4?
For technical support, including TL431IDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431IDBZTG4 requirements.
6.How does Aetrix verify that TL431IDBZTG4 is sourced from the original manufacturer or authorized distributors?
All TL431IDBZTG4 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 TL431IDBZTG4 meets industry standards.
7.What is the process for return or replacement of TL431IDBZTG4?
All TL431IDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431IDBZTG4, 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 TL431IDBZTG4 part is unused and in its original packaging.
Return procedure for TL431IDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431IDBZTG4 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
