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Texas Instruments TL431BIDBZR
- Part No.:
- TL431BIDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL431BIDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:50,672
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Product details
Overview
TL431BIDBZR from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 0.5% initial reference voltage tolerance at 25°C, adjustable output from 2.495 V to 36 V, and operation across −40°C to 125°C. It delivers 0.2 Ω typical dynamic impedance, 1–100 mA sink-current capability, and low 14 mV max temperature drift (Q-grade), making it ideal for feedback regulation in isolated DC/DC converters.
For engineers reviewing the TL431BIDBZR datasheet, TL431BIDBZR pinout, TL431BIDBZR application, or TL431BIDBZR equivalent, key selection criteria include its Q-grade temperature range, B-grade accuracy, SOT-23-3 footprint compatibility, and verified stability with capacitive loads up to 10 µF in power supply feedback loops.
Technical Context
The TL431BIDBZR implements an internal bandgap reference, error amplifier, and NPN pass transistor in a three-terminal shunt topology. Its REF pin senses voltage relative to ANODE, triggering cathode current draw when the divider ratio exceeds VREF, enabling precise closed-loop regulation without external op-amps.
Designed for high-stability feedback paths, it exhibits sharp turn-on characteristics and low 1.2 µA max reference input current deviation over temperature. The device's 0.2 Ω dynamic impedance and −1.4 to −2.7 mV/V cathode voltage sensitivity ensure minimal output perturbation under load transients and input ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±12 mV at 25°C (B-grade); sets precise feedback threshold for power supply regulation |
| 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); supports automotive and industrial environments without derating |
| Dynamic Impedance | 0.2 Ω typical; maintains stable reference voltage under fast cathode current changes (1–100 mA) |
| Ref Input Current | 2–4 µA typical; minimizes resistor-divider loading error in high-impedance feedback networks |
| Min Cathode Current | 0.4–0.7 mA; ensures reliable regulation start-up even with light-load or high-resistance dividers |
| Off-State Leakage | 0.1–0.5 µA max at 36 V; prevents unintended conduction in shutdown or fault conditions |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: REF | Reference input | Senses voltage divider output; triggers regulation when ≥2.495 V above ANODE |
| Pin 2: CATHODE | Current sink output | Draws adjustable current to maintain REF voltage; connects to optocoupler LED or error amp input |
| Pin 3: ANODE | Common reference node | Typically tied to system ground or return path; all voltages referenced to this pin |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable shunt regulation | Output set from 2.495 V to 36 V using two external resistors - eliminates need for multiple fixed references |
| Low temperature drift | 14 mV max deviation over −40°C to +125°C - ensures <±0.5% output variation in wide-temp applications |
| Sharp turn-on characteristic | Fast transition from off-state to full conduction - improves transient response in switching regulator feedback |
| Low output noise | Sub-20 µVRMS (0.1–10 Hz); critical for low-noise analog sensing and precision DAC references |
| Stability with capacitive loads | Verified stable with up to 10 µF on cathode - simplifies EMI filtering without external compensation |
Applications
| AC/DC Power Supply Feedback | Rack Server VRM Monitoring |
|---|---|
Use Scenario: Secondary-side voltage sensing in isolated flyback or forward converters with optocoupler isolation. IC Role / Device Role / Timing Role: Shunt reference providing precise feedback threshold to drive optocoupler LED current. Use Value: Enables ±1% output regulation across line/load/temperature with no secondary-side controller IC. |
Use Scenario: Remote sense and margining of 12 V/5 V/3.3 V rails in multi-phase server VRMs. IC Role / Device Role / Timing Role: Programmable reference for DAC-controlled voltage margining and fault detection comparators. Use Value: Supports factory calibration and field-adjustable voltage offsets via resistor network reconfiguration. |
| Industrial Motor Drive Control | Industrial AC Inverter Feedback |
Use Scenario: Overvoltage protection and bus voltage regulation in servo drive DC-link monitoring circuits. IC Role / Device Role / Timing Role: Precision threshold detector for IGBT gate driver disable signals during overvoltage events. Use Value: Guarantees trip point accuracy within ±0.5% across −40°C to +125°C ambient, reducing false trips. |
Use Scenario: DC bus voltage scaling and feedback in variable-frequency AC inverters for HVAC and pumps. IC Role / Device Role / Timing Role: High-stability reference for ADC input scaling and PWM comparator thresholds. Use Value: Maintains consistent voltage measurement accuracy despite thermal cycling in enclosed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BQDBZR | Same B-grade accuracy and Q-temp rating, but SOT-23-3 package with identical pinout | No functional difference; TL431BQDBZR is TI's orderable designation for same device | Select TL431BQDBZR if ordering directly from TI's official part numbering system |
| AS431BZTR-E1 | 0.5% tolerance, −40°C to +125°C, but higher 25 mV temp drift and 0.5 Ω typical ZKA | Acceptable for non-critical industrial supplies where tighter drift isn't required | Choose only if cost sensitivity outweighs need for lowest drift and impedance |
Compared with TL431BIDBZR, TL431BQDBZR offers identical electrical and thermal performance in the same package, while AS431BZTR-E1 trades 11 mV higher temperature drift and 2.5× higher dynamic impedance for lower unit cost in less demanding applications.
Availability
TL431BIDBZR is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC conversion, and AC inverter & VF drives requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL431BIDBZR 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 technologies, with decades of expertise in precision reference design.
The TL431 product line was engineered for high-accuracy, wide-temperature shunt regulation in power supply feedback, industrial control, and safety-critical voltage monitoring systems.
FAQ
What is the reference voltage tolerance of TL431BIDBZR at 25°C?
The TL431BIDBZR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 2.495 V nominal output with a guaranteed range of 2.483 V to 2.507 V. This B-grade accuracy is specified in Section 6.13 of the TI SLVS543S datasheet and applies across the full operating temperature range when combined with its Q-grade rating.
Does TL431BIDBZR support operation at −40°C to +125°C?
Yes, TL431BIDBZR is rated for operation from −40°C to +125°C (Q-grade). Its electrical characteristics-including reference voltage deviation (max ±34 mV), reference input current drift (max ±2.5 µA), and dynamic impedance-are fully specified across this extended industrial/automotive temperature range per TI's SLVS543S datasheet Section 6.13.
What is the minimum cathode current required for regulation in TL431BIDBZR?
The TL431BIDBZR requires a minimum cathode current of 0.4 mA to 0.7 mA for stable regulation, depending on temperature and operating conditions. This value is specified in Section 6.13 of the TI datasheet as "Imin" and ensures reliable turn-on and closed-loop control in high-resistance feedback networks.
Can TL431BIDBZR replace a Zener diode in power supply designs?
Yes, TL431BIDBZR is explicitly designed as a superior replacement for Zener diodes in voltage regulation applications. Its sharp turn-on characteristic, 0.2 Ω dynamic impedance, and adjustable 2.495–36 V output eliminate Zener limitations like poor temperature stability, high impedance, and fixed voltage options-especially in feedback loops of switching power supplies.
What package type does TL431BIDBZR use, and what are its dimensions?
TL431BIDBZR uses the SOT-23-3 package with nominal body dimensions of 2.90 mm × 1.30 mm. Pin configuration is REF (Pin 1), CATHODE (Pin 2), ANODE (Pin 3), matching the standard TL431 DBZ footprint. This compact, surface-mount package supports high-density PCB layouts in space-constrained power modules.
TL431BIDBZR 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:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 700 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL431BIDBZR FAQ
1.How can I place an order for TL431BIDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431BIDBZR 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 TL431BIDBZR reliable?
The price and inventory of TL431BIDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431BIDBZR is usually 5 days.
3.What payment methods are accepted for TL431BIDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431BIDBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431BIDBZR?
TL431BIDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431BIDBZR 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 TL431BIDBZR?
For technical support, including TL431BIDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431BIDBZR requirements.
6.How does Aetrix verify that TL431BIDBZR is sourced from the original manufacturer or authorized distributors?
All TL431BIDBZR 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 TL431BIDBZR meets industry standards.
7.What is the process for return or replacement of TL431BIDBZR?
All TL431BIDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TL431BIDBZR, 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 TL431BIDBZR part is unused and in its original packaging.
Return procedure for TL431BIDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431BIDBZR Tags
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