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Texas Instruments TLVH431BQDBVT
- Part No.:
- TLVH431BQDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLVH431BQDBVT.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:998
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Product details
Overview
TLVH431BQDBVT from Texas Instruments is a low-voltage adjustable precision shunt regulator with 0.5% initial reference voltage tolerance at 25°C, 1.24 V nominal reference voltage, and operation down to 1.24 V cathode-to-anode voltage. It delivers stable regulation across –40°C to +125°C, supports cathode currents from 100 μA to 70 mA, and features 0.25 Ω typical dynamic impedance-enabling accurate secondary-side feedback in isolated 3.3 V flyback SMPS designs.
For engineers reviewing the TLVH431BQDBVT datasheet, TLVH431BQDBVT pinout, TLVH431BQDBVT application, or TLVH431BQDBVT equivalent, key selection criteria include its B-grade (0.5%) VREF accuracy, Q-temperature grade (–40°C to +125°C), SOT-23-3 (DBZ) package pinout, and compatibility with optocoupler-based isolated feedback loops requiring low-voltage headroom and sharp turn-on characteristics.
Technical Context
The TLVH431BQDBVT implements a precision bandgap reference and high-gain transconductance amplifier in a 3-terminal shunt topology. Its internal architecture forces the REF pin to 1.24 V when sufficient cathode current (≥100 μA) flows and feedback is applied, enabling closed-loop voltage regulation via external resistor dividers.
It operates in two distinct functional modes: open-loop comparator mode (with integrated 1.24 V reference) for voltage monitoring, and closed-loop shunt regulator mode for adjustable output stabilization. Unlike the TL431, it achieves regulation starting at 1.24 V and requires no external compensation capacitor for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF (25°C) | 1.24 V ±0.5% - enables precise setting of output voltages from 1.24 V to 18 V using two external resistors |
| Operating Temp Range | –40°C to +125°C - qualified for automotive and industrial environments requiring extended thermal robustness |
| Cathode Current Range | 100 μA to 70 mA - supports ultra-low-power monitoring and higher-current shunt regulation without external gain stages |
| Dynamic Impedance | 0.25 Ω typical - ensures minimal output voltage deviation under load transients, critical for tight-regulation feedback paths |
| Reference Input Current | 0.1–0.5 μA - allows high-impedance resistor networks (e.g., >1 MΩ) without significant VREF error contribution |
| VKA Max | 20 V absolute max - defines safe operating voltage headroom above regulated output, supporting up to 18 V adjustable outputs |
| ESD Rating (HBM) | ±2000 V - meets standard handling requirements for automated assembly in industrial manufacturing lines |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, gull-wing leads, surface-mount compatible. Thermal resistance RθJA = 206 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CATHODE | Shunt current input / output node | Primary current path; sinks regulated current to maintain REF voltage; connects to optocoupler LED anode in isolated SMPS |
| 2: REF | Reference input terminal | Senses divided output voltage; must be biased with ≥0.1 μA; floating connection invalidates regulation |
| 3: ANODE | Common return / ground reference | Low-impedance return path; typically connected to system ground or power rail common; substrate tie point |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% VREF tolerance (B grade) | Reduces output voltage error budget in precision feedback loops-critical for <±1% output regulation in 3.3 V SMPS |
| –40°C to +125°C operation (Q grade) | Validated performance across full automotive under-hood and industrial control temperature extremes |
| 100 μA minimum cathode current | Enables regulation at ultra-low power-supports energy harvesting and battery-backed monitoring circuits |
| 0.25 Ω dynamic impedance | Minimizes load-induced output variation; improves transient response vs. Zener diodes or higher-impedance references |
| No external compensation required | Eliminates output capacitor dependency for stability-simplifies layout and reduces BOM count in space-constrained designs |
Applications
| Isolated Flyback SMPS Feedback | Voltage Monitoring & Threshold Detection |
|---|---|
Use Scenario: Secondary-side voltage sensing in 3.3 V isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Adjustable shunt regulator and error amplifier-compares scaled output voltage to internal 1.24 V reference and drives optocoupler LED current. Use Value: Enables regulation as low as 2.7 V output (1.24 V + opto VF) with <±1% accuracy over temperature and line, replacing discrete Zener+op-amp solutions. |
Use Scenario: Monitoring 5 V or 3.3 V power rails for undervoltage lockout or brownout detection. IC Role / Device Role / Timing Role: Precision comparator with integrated reference-REF pin compares rail voltage divider to 1.24 V threshold. Use Value: Eliminates external reference IC; achieves 0.5% trip-point accuracy across –40°C to +125°C without calibration. |
| Adjustable Linear Regulator Reference | Zener Diode Replacement |
Use Scenario: Setting output voltage of adjustable LDOs or series pass regulators via feedback divider. IC Role / Device Role / Timing Role: High-accuracy, low-drift voltage reference source-replaces TL431 where <1.24 V headroom is unavailable. Use Value: Supports regulation down to 1.24 V input-to-output differential; 0.25 Ω impedance minimizes load regulation error. |
Use Scenario: Replacing 2.4 V–3.3 V Zener diodes in on-board biasing, clamping, or reference applications. IC Role / Device Role / Timing Role: Low-leakage (0.02–0.1 μA off-state), sharp-turn-on shunt element-behaves like ideal Zener with programmable VZ. Use Value: Reduces leakage by >10× vs. typical Zeners; eliminates VZ drift and temperature coefficient issues. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AQDBVT | 1% VREF tolerance at 25°C (A grade), same Q-temp grade and DBZ package | Acceptable where ±1% output regulation suffices; lower cost than B grade | Select when tighter VREF accuracy is not required and cost sensitivity is higher |
| TLVH431BIDBVT | B grade (0.5% VREF) but I-temp grade (–40°C to +85°C), same DBZ package | Suitable for commercial/industrial equipment without extended temperature needs | Choose for non-automotive applications where full Q-grade range is unnecessary |
Compared with TLVH431AQDBVT and TLVH431BIDBVT, the TLVH431BQDBVT uniquely combines 0.5% initial VREF accuracy with –40°C to +125°C operation in the compact SOT-23-3 package-making it the only option among the three qualified for automotive under-hood and high-reliability industrial feedback systems.
Availability
TLVH431BQDBVT is available at Aetrix Electronics and suitable for isolated SMPS feedback, voltage monitoring, adjustable linear regulator reference, and Zener replacement applications requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH431BQDBVT 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 delivering analog, embedded processing, and connectivity solutions with deep expertise in precision analog and power management ICs.
The TLVH431 family was designed specifically for low-voltage, high-accuracy shunt regulation in isolated power supplies and precision monitoring-addressing limitations of legacy TL431 devices in 3.3 V and lower systems.
FAQ
What is the reference voltage tolerance of TLVH431BQDBVT at 25°C?
The TLVH431BQDBVT has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a VREF range of 1.234 V to 1.246 V. This B-grade accuracy is specified in Section 5.7 of the TI datasheet SLVS555N and applies across the full Q-temperature range when combined with the device's low temperature coefficient.
Which package does TLVH431BQDBVT use, and what are its key mechanical dimensions?
TLVH431BQDBVT uses the SOT-23-3 (DBZ) package with nominal body dimensions of 2.92 mm × 1.30 mm. Pin 1 is CATHODE, Pin 2 is REF, and Pin 3 is ANODE-matching the standard 3-pin SOT-23 pinout shown in Figure 4-4 of the datasheet. The package supports reflow soldering per JEDEC J-STD-020.
Can TLVH431BQDBVT operate with cathode-to-anode voltage below 2.5 V?
Yes, TLVH431BQDBVT is explicitly designed for low-voltage operation down to 1.24 V cathode-to-anode voltage (VKA). Its 1.24 V reference enables regulation in 3.3 V and lower isolated SMPS topologies where legacy TL431 devices (2.5 V min) cannot function-verified in Figure 8-1 and Section 7.1 of the datasheet.
What is the minimum cathode current required for regulation in TLVH431BQDBVT?
The TLVH431BQDBVT requires a minimum cathode current of 100 μA to maintain regulation, as specified in Section 5.5 (IK(min)) of the datasheet. This value is guaranteed over the full –40°C to +125°C temperature range and is critical for stable operation in low-power feedback circuits.
How does TLVH431BQDBVT differ from TLVH432BQDBVT in pin configuration?
TLVH431BQDBVT and TLVH432BQDBVT share identical electrical specifications but differ in pinout: TLVH431BQDBVT uses CATHODE–REF–ANODE (Pin 1–2–3), while TLVH432BQDBVT uses REF–CATHODE–ANODE (Pin 1–2–3) in the same SOT-23-3 package-as confirmed in Figures 4-4 and 4-5 of the datasheet. PCB layout must match the correct variant.
TLVH431BQDBVT 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):
- 18 V
- Current - Output:
- 70 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
TLVH431BQDBVT FAQ
1.How can I place an order for TLVH431BQDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431BQDBVT 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 TLVH431BQDBVT reliable?
The price and inventory of TLVH431BQDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BQDBVT is usually 5 days.
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TLVH431BQDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431BQDBVT 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 TLVH431BQDBVT?
For technical support, including TLVH431BQDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BQDBVT requirements.
6.How does Aetrix verify that TLVH431BQDBVT is sourced from the original manufacturer or authorized distributors?
All TLVH431BQDBVT 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 TLVH431BQDBVT meets industry standards.
7.What is the process for return or replacement of TLVH431BQDBVT?
All TLVH431BQDBVT units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BQDBVT, 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 TLVH431BQDBVT part is unused and in its original packaging.
Return procedure for TLVH431BQDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431BQDBVT Tags
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