My Inquiry
My Account
Texas Instruments TL431IDBZRG4
- Part No.:
- TL431IDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431IDBZRG4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,193
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TL431IDBZRG4 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 industrial power supplies.
For engineers reviewing the TL431IDBZRG4 datasheet, TL431IDBZRG4 pinout, TL431IDBZRG4 application, or TL431IDBZRG4 equivalent, key selection criteria include its Q-temp automotive-grade temperature range, low output noise, sink-current capability up to 100 mA, and compatibility with standard resistor-divider feedback networks in flyback and forward converter topologies.
Technical Context
The TL431IDBZRG4 implements a bandgap-based error amplifier with internal reference and output transistor in a three-terminal shunt configuration. Its REF pin senses voltage relative to ANODE, triggering cathode current conduction when input exceeds 2.495 V, enabling precise regulation without external op-amps.
It features active output circuitry for sharp turn-on characteristics and stable operation across 1 mA–100 mA cathode current, with thermal stability validated for −40°C to +125°C operation. The device replaces discrete Zener diodes in applications requiring tighter voltage accuracy and lower temperature drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±0.5% at 25°C - sets feedback threshold for output regulation accuracy |
| Temp Range | −40°C to +125°C - qualified for automotive and industrial environments |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal output voltage shift under load transients |
| Cathode Current | 1 mA to 100 mA - defines usable sink-current range for feedback loop biasing |
| Temp Drift | 14 mV max over full range - limits reference voltage variation in wide-temperature systems |
| Output Noise | Low - reduces ripple injection into feedback path of switching regulators |
| Input Bias Current | 2–4 µA - enables high-resistance divider networks without significant error |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF | Reference Input | Senses voltage divider output; conduction begins when voltage ≥ 2.495 V relative to ANODE |
| CATHODE | Current Sink Output | Provides regulated shunt path to ANODE; carries full feedback current in closed-loop operation |
| ANODE | Common Return | Acts as circuit ground reference for REF and return path for cathode current; must be connected to system ground or lowest potential node |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% Initial Tolerance (B Grade) | Enables <±12.5 mV absolute output error at 2.495 V without calibration |
| Q-Temp Rating (−40°C to +125°C) | Validated for under-hood automotive and high-ambient industrial power stages |
| 0.2 Ω Dynamic Impedance | Maintains <20 mV deviation at 100 mA load step, critical for tight-regulation SMPS |
| 1 mA Minimum Cathode Current | Allows stable regulation with high-value feedback resistors, reducing power loss |
| Low Reference Input Current (2–4 µA) | Permits >1 MΩ upper-divider resistance without compromising accuracy |
Applications
| Rack Server Power | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage sensing in isolated 48 V–12 V DC/DC modules for telecom/datacom servers. IC Role / Device Role / Timing Role: Shunt reference providing feedback to optocoupler-driven PWM controller for output regulation. Use Value: 0.5% tolerance and 14 mV temp drift ensure <±0.6% total output variation across temperature, meeting server PSU efficiency and reliability specs. | Use Scenario: Output voltage regulation in 3 kW industrial rectifier with PFC front-end and LLC resonant stage. IC Role / Device Role / Timing Role: Precision shunt reference in secondary-side feedback network controlling synchronous rectifier gate drive timing. Use Value: Low 0.2 Ω impedance minimizes load-induced voltage droop during transient steps, preserving tight ±1% output tolerance. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: DC bus voltage monitoring and overvoltage protection trigger in 7.5 kW variable-frequency motor drives. IC Role / Device Role / Timing Role: Adjustable shunt reference setting trip threshold for analog comparator-based OVP circuit. Use Value: Programmable 2.495 V–36 V range allows direct scaling to 800 V DC bus via resistor divider, eliminating need for external op-amp. | Use Scenario: Isolated feedback for ±15 V auxiliary supply powering gate drivers and position encoder interfaces. IC Role / Device Role / Timing Role: Shunt reference stabilizing optocoupler LED current to maintain consistent isolation barrier gain. Use Value: Low 2–4 µA input bias enables stable operation with high-impedance dividers, reducing heat generation in compact servo enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBZR | 0.5% tolerance, but rated only for 0°C to 70°C (C-temp) | Not suitable for automotive or extended-temperature industrial use | Select TL431CDBZR only for commercial-grade consumer power supplies with ambient <70°C |
| TL431BQDBZR | Identical electrical specs and Q-temp rating; differs only in tape-and-reel packaging (no G4 suffix) | No functional difference; same PCB layout and thermal performance | TL431BQDBZR is functionally identical and may be used interchangeably where reel packaging is acceptable |
Compared with TL431CDBZR, TL431IDBZRG4 provides guaranteed operation down to −40°C and up to +125°C-critical for automotive engine control units and outdoor industrial inverters-while TL431BQDBZR offers identical performance in non-G4 packaging, simplifying procurement for high-volume production.
Availability
TL431IDBZRG4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for TL431IDBZRG4 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, embedded processing, and power management ICs, with decades of expertise in precision reference design.
The TL431 product line delivers cost-effective, high-accuracy shunt references for feedback loops in isolated power converters, replacing Zener diodes in applications demanding <1% voltage tolerance and robust thermal stability.
FAQ
What is the reference voltage tolerance of TL431IDBZRG4 at 25°C?
The TL431IDBZRG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 2.495 V nominal value with ±12.5 mV absolute deviation. This B-grade specification is confirmed in Section 6.11 of the TI datasheet (SLVS543S) and applies specifically to the I-temp and Q-temp variants including TL431IDBZRG4. The tolerance remains stable across its full operating temperature range due to internal bandgap compensation.
Does TL431IDBZRG4 support operation at −40°C to +125°C?
Yes, TL431IDBZRG4 is explicitly characterized for operation from −40°C to +125°C (Q-temp grade), as documented in Section 4 (Device Comparison Table) and Section 6.7 of the TI datasheet. Its maximum reference voltage deviation over this range is 14 mV, verified by testing across the full interval-not extrapolated-and supported by thermal characterization in RθJA = 206°C/W for the SOT-23-3 package.
What is the minimum cathode current required for regulation in TL431IDBZRG4?
The TL431IDBZRG4 requires a minimum cathode current of 0.4 mA to maintain regulation, per Section 6.5–6.13 Electrical Characteristics tables in the TI datasheet. This value is consistent across all grades (B/A/standard) and temperature grades (I/Q), and enables reliable startup and feedback loop stability even with high-value resistor dividers that limit bias current.
How does the dynamic impedance of TL431IDBZRG4 affect power supply performance?
The TL431IDBZRG4 exhibits 0.2 Ω typical dynamic impedance (|ZKA|), measured at ≤1 kHz with 1–100 mA cathode current. This low value directly limits output voltage deviation during load transients-for example, a 50 mA step induces <10 mV shift-making it essential for maintaining tight regulation in high-performance DC/DC converters where feedback path stability is critical.
Can TL431IDBZRG4 replace a Zener diode in existing designs?
Yes, TL431IDBZRG4 is designed as a direct functional replacement for Zener diodes in voltage regulation and reference applications. Its sharp turn-on characteristic, adjustable 2.495 V–36 V output via two external resistors, and 0.2 Ω dynamic impedance provide superior accuracy, temperature stability, and transient response compared to standard Zeners-without requiring circuit topology changes beyond adding the REF resistor divider.
TL431IDBZRG4 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
TL431IDBZRG4 FAQ
1.How can I place an order for TL431IDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431IDBZRG4 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 TL431IDBZRG4 reliable?
The price and inventory of TL431IDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431IDBZRG4 is usually 5 days.
3.What payment methods are accepted for TL431IDBZRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431IDBZRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431IDBZRG4?
TL431IDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431IDBZRG4 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 TL431IDBZRG4?
For technical support, including TL431IDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431IDBZRG4 requirements.
6.How does Aetrix verify that TL431IDBZRG4 is sourced from the original manufacturer or authorized distributors?
All TL431IDBZRG4 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 TL431IDBZRG4 meets industry standards.
7.What is the process for return or replacement of TL431IDBZRG4?
All TL431IDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431IDBZRG4, 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 TL431IDBZRG4 part is unused and in its original packaging.
Return procedure for TL431IDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431IDBZRG4 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…
