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Texas Instruments TLV431BQDBVR
- Part No.:
- TLV431BQDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLV431BQDBVR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:9,965
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Product details
Overview
TLV431BQDBVR from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, 0.5% initial tolerance at 25°C, 0.25 Ω typical dynamic impedance, and operation down to 1.24 V cathode-anode voltage - used as an integrated reference in isolated flyback SMPS feedback loops, Zener replacement circuits, and voltage monitoring systems.
For engineers reviewing the TLV431BQDBVR datasheet, TLV431BQDBVR pinout, TLV431BQDBVR application, or TLV431BQDBVR equivalent, key selection criteria include reference accuracy over temperature (±11 mV from –40°C to 125°C), ultra-low 80 µA typical cathode current for regulation, SC-70 package footprint, and compatibility with optocoupler-based secondary-side regulation in 3.3 V and lower-output power supplies.
Technical Context
The TLV431BQDBVR implements a bandgap-referenced error amplifier driving a Darlington sink output stage, enabling precise shunt regulation without external compensation. Its internal reference is trimmed to 1.24 V ±0.5% at 25°C and exhibits 11 mV total deviation across –40°C to 125°C (Q-grade).
It operates in two functional modes: open-loop comparator mode (with integrated 1.24 V threshold) and closed-loop shunt regulator mode (using external resistive divider feedback from cathode to reference pin). Minimum cathode current for regulation is 55–100 µA depending on temperature grade.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±0.5% at 25°C - sets minimum adjustable output; enables regulation down to 1.24 V in Zener-replacement or feedback applications. |
| Adjustable Output Range | VREF to 6 V - achieved via two external resistors; supports 3.3 V, 2.5 V, and 1.8 V system references. |
| Temp Drift (–40°C to 125°C) | ±11 mV - ensures stable reference in automotive under-hood and industrial control environments. |
| Dynamic Impedance | 0.25 Ω typical - provides tight regulation under load transients; critical for error amplifier stability in SMPS feedback. |
| Min Cathode Current (IK(min)) | 55 µA (typ), ≤100 µA (max) - enables low-power operation; allows use with high-value feedback resistors to minimize quiescent loss. |
| Output Configuration | Open-collector cathode - requires external pull-up; compatible with optocoupler LED drive in isolated topologies. |
| ESD Rating (HBM) | ±2000 V - meets standard handling requirements for board assembly and field service. |
Pinout & Package
TLV431BQDBVR is housed in a 6-pin SC-70 (DCK) package measuring 2.0 mm × 1.5 mm - 40% smaller than SOT-23-3 - with thermal resistance RθJA = 87°C/W and substrate-connected pin 2 requiring connection to anode or left floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current sink output | Primary current path; sinks up to 15 mA; connects to optocoupler anode or load return in shunt regulator mode. |
| REF (Pin 3) | Reference input | Senses divided output voltage; must be biased with ≥0.1 µA; determines regulation point via R1/R2 ratio. |
| ANODE (Pin 6) | Common return | Typically grounded; serves as reference node for cathode voltage (VKA) and reference threshold. |
| NC (Pins 4, 5) | No internal connection | Unbonded; no electrical function; may be left unconnected or tied to ANODE for mechanical stability. |
| SUBSTRATE (Pin 2) | Die attachment pad | Must be connected to ANODE or left open; not electrically active but affects thermal and ESD performance. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24 V reference enables regulation in 1.8 V, 2.5 V, and 3.3 V systems where TL431 (2.5 V) cannot function. |
| High accuracy grade | 0.5% initial tolerance (B-grade) reduces calibration overhead in precision voltage monitors and ADC references. |
| Ultra-small SC-70 package | 2.0 mm × 1.5 mm footprint saves PCB area in space-constrained power modules and portable electronics. |
| Stable without output capacitor | Internally compensated - eliminates need for external stabilization cap in most feedback configurations, simplifying layout. |
| Wide temperature range support | Qualified for –40°C to 125°C (Q-grade) - suitable for automotive engine control units and industrial motor drives. |
Applications
| Isolated Flyback SMPS Regulation | Zener Diode Replacement |
|---|---|
Use Scenario: Secondary-side voltage sensing in 3.3 V/5 V isolated DC-DC converters using optocoupler feedback. IC Role / Device Role / Timing Role: Precision shunt regulator and error amplifier - compares divided output against 1.24 V reference and drives optocoupler LED current. Use Value: Enables <2.7 V regulated output with <11 mV drift over –40°C to 125°C, improving cross-regulation and efficiency vs. discrete Zener + op-amp solutions. | Use Scenario: On-board 2.5 V or 3.3 V rail stabilization where space and accuracy exceed standard Zener capabilities. IC Role / Device Role / Timing Role: Adjustable shunt reference - replaces 1N47xx series Zeners with programmable VOUT and tighter tolerance. Use Value: Delivers 0.5% initial accuracy and 0.25 Ω impedance vs. ±5% Zener tolerance and >10 Ω impedance, reducing output ripple and load regulation error. |
| Voltage Monitoring & Threshold Detection | Comparator with Integrated Reference |
Use Scenario: Undervoltage lockout (UVLO) or overvoltage protection (OVP) in battery-powered microcontrollers and PMICs. IC Role / Device Role / Timing Role: Precision voltage comparator - REF pin senses monitored rail; CATHODE outputs open-collector alert signal. Use Value: Eliminates external reference IC; trip point set by resistor divider with ±11 mV total drift ensures reliable fault detection across automotive temperature range. | Use Scenario: Level-shifting and logic-compatible threshold detection in sensor interface circuits and analog front-ends. IC Role / Device Role / Timing Role: Open-loop comparator - uses internal 1.24 V reference to compare analog input against fixed threshold. Use Value: Provides fast response with built-in reference; output swings from ~1 V (low) to VSUP (high), supporting direct interfacing to 3.3 V logic without level shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV431BIDBVR | I-grade (–40°C to 85°C); same 0.5% tolerance, 0.25 Ω impedance, SC-70 package | Not qualified for automotive under-hood or extended industrial ambient; lower cost for commercial equipment | Select when full Q-grade temperature range is unnecessary and BOM cost optimization is prioritized. |
| TLVH431IDBVR | Wider VKA range (1.24 V to 18 V); higher IK (80 mA); SOT-23-3 package; 1% initial tolerance | Supports higher-output SMPS and industrial HV rails; lacks Q-grade temp rating and 0.5% accuracy | Choose when >6 V output or >15 mA cathode current is required, accepting reduced accuracy and narrower temp range. |
Compared with TLV431BIDBVR, TLV431BQDBVR adds automotive-grade temperature qualification (–40°C to 125°C) without sacrificing accuracy or impedance; versus TLVH431IDBVR, it trades higher voltage/current capability for superior precision and thermal stability in low-voltage, space-constrained designs.
Availability
TLV431BQDBVR is available at Aetrix Electronics and suitable for automotive power management, industrial isolated SMPS, and precision voltage monitoring applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TLV431BQDBVR 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 company delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.
The TLV431 family is designed as a low-voltage, high-accuracy alternative to the TL431, targeting precision shunt regulation in space- and power-constrained systems operating below 3.3 V.
FAQ
What is the maximum cathode-anode voltage (VKA) rating for TLV431BQDBVR?
The absolute maximum cathode-anode voltage for TLV431BQDBVR is 7 V, as specified in the Absolute Maximum Ratings table. Operation beyond this voltage risks permanent damage. The recommended operating range is VREF (1.24 V) to 6 V, ensuring stable regulation and compliance with thermal limits under continuous load.
Does TLV431BQDBVR require an external output capacitor for stability?
No, TLV431BQDBVR is internally compensated and remains stable without an external output capacitor between cathode and anode in most configurations. However, if a capacitive load is present - such as an optocoupler LED with parasitic capacitance - Figure 5-19 in the datasheet provides phase margin guidance to select an appropriate series resistor or damping network.
How does the substrate pin (Pin 2) on TLV431BQDBVR affect circuit operation?
Pin 2 on TLV431BQDBVR is the substrate connection and must be connected to the ANODE node or left electrically floating. It is not internally connected to any active circuitry but influences thermal dissipation and ESD robustness. Leaving it unconnected or improperly tied may degrade thermal performance or increase susceptibility to latch-up in high-noise environments.
Can TLV431BQDBVR be used as a standalone voltage reference without feedback resistors?
Yes - when configured in open-loop mode with cathode pulled up to a supply and reference pin biased above 1.24 V, TLV431BQDBVR functions as a comparator with integrated 1.24 V threshold. In this mode, it delivers fast switching between ~1 V (low) and VSUP (high), enabling direct use in UVLO, OVP, or logic-level detection without external reference ICs.
What is the minimum cathode current needed for regulation in TLV431BQDBVR at 125°C?
At 125°C, TLV431BQDBVR requires a minimum cathode current of 100 µA to maintain regulation, as specified in the IK(min) parameter for the Q-grade variant. Below this current, gain drops significantly, causing poor line/load regulation and delayed response - especially critical in low-power standby modes of isolated SMPS designs.
TLV431BQDBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 6 V
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TLV431BQDBVR FAQ
1.How can I place an order for TLV431BQDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV431BQDBVR 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 TLV431BQDBVR reliable?
The price and inventory of TLV431BQDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV431BQDBVR is usually 5 days.
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TLV431BQDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV431BQDBVR 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 TLV431BQDBVR?
For technical support, including TLV431BQDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV431BQDBVR requirements.
6.How does Aetrix verify that TLV431BQDBVR is sourced from the original manufacturer or authorized distributors?
All TLV431BQDBVR 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 TLV431BQDBVR meets industry standards.
7.What is the process for return or replacement of TLV431BQDBVR?
All TLV431BQDBVR units undergo pre-shipment inspection (PSI). If there is an issue with TLV431BQDBVR, 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 TLV431BQDBVR part is unused and in its original packaging.
Return procedure for TLV431BQDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLV431BQDBVR Tags
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TL431BQDBZR
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AZ431LBNTR-G1
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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