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Texas Instruments TLVH431QDBVTG4
- Part No.:
- TLVH431QDBVTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLVH431QDBVTG4.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,896
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Product details
Overview
TLVH431QDBVTG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-23-5 package, delivering 1.24 V reference voltage with ±0.5% initial tolerance (B-grade), 100 μA minimum cathode current for regulation, 0.25 Ω typical dynamic impedance, and operation across –40°C to +125°C. It serves as an ultra-low-voltage Zener replacement and error amplifier in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH431QDBVTG4 datasheet, TLVH431QDBVTG4 pinout, TLVH431QDBVTG4 application, or TLVH431QDBVTG4 equivalent, key selection criteria include its 1.24 V reference threshold, cathode current range (100 μA–70 mA), thermal stability over automotive temperature range, and compatibility with optocoupler-based secondary-side regulation circuits.
Technical Context
The TLVH431QDBVTG4 implements a three-terminal shunt-regulator architecture with an internal 1.24 V bandgap reference and high-gain NPN-based error amplifier driving a Darlington sink output stage. Its open-loop comparator mode enables precise voltage monitoring without external reference components.
In closed-loop configuration, it functions as a programmable shunt regulator where output voltage VO = VREF × (1 + R1/R2) + Iref × R1, supporting adjustable regulation from 1.24 V to 18 V. Internal compensation ensures stability without mandatory output capacitance, though phase margin vs. capacitive load is characterized up to 100 nF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V nominal at 25°C; ±0.5% initial tolerance (B-grade) enables tight-setpoint designs for low-voltage rails. |
| Operating Temperature Range | –40°C to +125°C (Q-grade); qualified for automotive underhood and industrial control environments. |
| Cathode Current Range | 100 μA to 70 mA; 100 μA minimum ensures stable regulation in ultra-low-power applications like battery monitors. |
| Dynamic Impedance | 0.25 Ω typical; provides low-output-impedance voltage reference behavior comparable to precision Zeners. |
| Reference Input Current (Iref) | 0.1–0.5 μA; ultra-low bias current minimizes resistor-divider loading errors in high-impedance feedback networks. |
| VREF vs Cathode Voltage Drift | –1.5 to –2.7 mV/V; quantifies reference stability under varying cathode headroom-critical for wide-input-range SMPS. |
| Output Voltage Range | Adjustable from VREF (1.24 V) to 18 V using two external resistors; supports direct replacement of legacy 2.5 V TL431 in upgraded low-VIN systems. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm max height, gull-wing leads, RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - NC | No internal connection | Must be left unconnected; no electrical function or thermal path. |
| 2 - NC (Substrate) | Substrate tie | Internally connected to die substrate; must be tied to ANODE or left floating-no independent biasing. |
| 3 - CATHODE | Shunt current input / output node | Sinks regulated current; connects to SMPS output via optocoupler LED or directly to load for shunt regulation. |
| 4 - REF | Reference input terminal | Senses feedback voltage; requires ≥0.1 μA bias current; forms adjustable divider with R1/R2 for VO programming. |
| 5 - ANODE | Common return / ground reference | Typically connected to system ground or power rail common; defines reference potential for all internal circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V cathode-to-anode voltage-enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 fails. |
| B-grade precision | ±0.5% VREF tolerance at 25°C reduces calibration overhead in factory-trimmed power supplies and data converters. |
| Automotive temperature grade | Specified from –40°C to +125°C meets AEC-Q100 stress test requirements for under-hood and ADAS subsystems. |
| Ultra-low Iref | 0.1–0.5 μA reference input current allows >1 MΩ feedback dividers-minimizing power loss and noise sensitivity. |
| Stable without output capacitor | Internally compensated architecture eliminates mandatory cathode-to-anode capacitor-simplifying layout in space-constrained designs. |
Applications
| Isolated Flyback SMPS Feedback | Low-Voltage Rail Monitoring |
|---|---|
Use Scenario: Secondary-side voltage sensing in 3.3 V/5 V isolated DC-DC converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Adjustable shunt regulator and error amplifier-compares sampled output against 1.24 V reference and drives optocoupler LED current. Use Value: Enables regulation down to 2.7 V output (1.24 V + opto VF), extending usable range beyond TL431-based designs. |
Use Scenario: Real-time detection of brownout or overvoltage on microcontroller I/O rails or sensor supply lines. IC Role / Device Role / Timing Role: Comparator with integrated reference-REF pin compares monitored rail to 1.24 V; CATHODE sinks current when threshold exceeded. Use Value: Eliminates need for external reference IC or precision resistor network-reducing BOM count and board area by >30%. |
| Adjustable Data Converter Reference | Zener Diode Replacement |
Use Scenario: Programmable reference for 12-bit+ SAR ADCs or DACs requiring stable, low-drift voltage setpoints. IC Role / Device Role / Timing Role: Precision shunt reference-VO set via R1/R2 divider; low dynamic impedance maintains accuracy under varying load currents. Use Value: 0.25 Ω impedance and <31 mV VREF drift over –40°C to +125°C ensure <0.1% full-scale error contribution in metrology-grade converters. |
Use Scenario: On-board 1.24–18 V regulation in point-of-load converters, LDO pre-biasing, or battery charge termination circuits. IC Role / Device Role / Timing Role: Active Zener substitute-provides sharp turn-on knee and orders-of-magnitude lower leakage than discrete Zeners. Use Value: IK(off) ≤ 0.1 μA at 18 V cathode voltage prevents standby current drain in always-on systems-critical for IoT edge nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt-regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BQDBVT | Same SOT-23-5 package and Q-grade temp range; differs only in tape-and-reel packaging (no G4 suffix) and minor marking variation. | Identical electrical performance and pinout; suitable for same PCB layouts and qualification programs. | Select TLVH431BQDBVT if standard TI reel packaging is preferred over TI's green-label G4 variant. |
| TLVH431QDBZR | SOT-23-3 (DBZ) package, 3-pin variant with REF–CATHODE–ANODE pinout; same Q-grade specs but different thermal resistance (RθJA = 206°C/W vs 206°C/W). | Smaller footprint (2.92 mm × 1.30 mm) but reduced power dissipation capability; not pin-compatible with DBV. | Choose TLVH431QDBZR only when board space is constrained and thermal budget permits lower power handling. |
Compared with TLVH431BQDBVT, TLVH431QDBVTG4 offers identical regulation performance but ships in TI's G4 green-label tape-and-reel format with enhanced traceability. Against TLVH431QDBZR, it provides higher thermal margin in the 5-pin SOT-23 package-critical for sustained 70 mA cathode loads in automotive modules.
Availability
TLVH431QDBVTG4 is available at Aetrix Electronics and suitable for automotive power management, industrial isolated converters, and precision analog monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TLVH431QDBVTG4 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 and power conversion technologies.
The TLVH431 family was designed specifically to extend shunt-regulator functionality into sub-2 V systems while maintaining automotive-grade reliability-addressing demand for smaller, more efficient, and thermally robust voltage references in next-generation power architectures.
FAQ
What is the reference voltage tolerance of TLVH431QDBVTG4 at 25°C?
The TLVH431QDBVTG4 features a B-grade reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal VREF with min/max bounds of 1.234 V and 1.246 V. This tight initial accuracy is confirmed in Section 5.7 of the SLVS555N datasheet and applies specifically to the Q-grade (–40°C to +125°C) version of the TLVH431B device in DBV package.
Does TLVH431QDBVTG4 require an output capacitor for stability?
No, TLVH431QDBVTG4 is internally compensated and operates stably without an output capacitor between CATHODE and ANODE. However, if a capacitor is added for noise filtering or transient response shaping, Figures 5-15 through 5-17 in the datasheet provide phase-margin vs. capacitive-load curves for 1.25 V, 2.5 V, and 5.0 V cathode voltages-guiding safe selection up to 100 nF.
What is the minimum cathode current needed for regulation in TLVH431QDBVTG4?
The TLVH431QDBVTG4 requires a minimum cathode current (IK(min)) of 100 μA to maintain regulation, as specified in Sections 5.5–5.7 of the datasheet. This value holds across the full –40°C to +125°C operating range and is critical for ensuring sufficient gain in the internal error amplifier during low-power operation.
How does TLVH431QDBVTG4 differ from standard TL431 in practical design?
TLVH431QDBVTG4 operates down to 1.24 V cathode voltage versus TL431's 2.5 V, enabling use in 1.8 V and 2.5 V systems. It also achieves regulation with only 100 μA minimum cathode current (vs. 1 mA for TL431) and offers tighter initial tolerance (±0.5% vs. ±1%). These differences reduce power loss, expand voltage range, and improve accuracy in modern low-voltage power designs.
Can TLVH431QDBVTG4 be used as a comparator?
Yes, TLVH431QDBVTG4 functions as a comparator with integrated 1.24 V reference in open-loop mode: when feedback is omitted from the REF pin, the device compares applied voltage at REF to its internal reference and saturates the CATHODE output accordingly. Section 7.4.1 and Figure 8-2 in the datasheet confirm this usage with design equations and schematic examples.
TLVH431QDBVTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 70 mA
- Tolerance:
- ±1.5%
- 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
TLVH431QDBVTG4 FAQ
1.How can I place an order for TLVH431QDBVTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431QDBVTG4 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 TLVH431QDBVTG4 reliable?
The price and inventory of TLVH431QDBVTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431QDBVTG4 is usually 5 days.
3.What payment methods are accepted for TLVH431QDBVTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431QDBVTG4 transactions.
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4.How is shipping managed for TLVH431QDBVTG4?
TLVH431QDBVTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431QDBVTG4 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 TLVH431QDBVTG4?
For technical support, including TLVH431QDBVTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431QDBVTG4 requirements.
6.How does Aetrix verify that TLVH431QDBVTG4 is sourced from the original manufacturer or authorized distributors?
All TLVH431QDBVTG4 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 TLVH431QDBVTG4 meets industry standards.
7.What is the process for return or replacement of TLVH431QDBVTG4?
All TLVH431QDBVTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431QDBVTG4, 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 TLVH431QDBVTG4 part is unused and in its original packaging.
Return procedure for TLVH431QDBVTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431QDBVTG4 Tags
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TL431BQDBZR
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LM4040CYM3-2.5-TR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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