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Texas Instruments TLVH431BIDBVT
- Part No.:
- TLVH431BIDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLVH431BIDBVT.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,497
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Product details
Overview
TLVH431BIDBVT from Texas Instruments is a low-voltage adjustable precision shunt regulator with 0.5% reference voltage tolerance at 25°C, 1.24V nominal VREF, 100μA–70mA cathode current range, and operation from –40°C to +125°C. It functions as a programmable Zener replacement or error amplifier in isolated flyback SMPS feedback loops, especially for 3.3V output regulation.
For engineers reviewing the TLVH431BIDBVT datasheet, TLVH431BIDBVT pinout, TLVH431BIDBVT application, or TLVH431BIDBVT equivalent, key selection criteria include initial VREF accuracy (B-grade), ultra-low minimum cathode current (100μA), SC-70 package footprint, dynamic impedance (0.25Ω), and compatibility with optocoupler-based secondary-side regulation circuits.
Technical Context
The TLVH431BIDBVT implements a bandgap-referenced error amplifier with Darlington output stage, enabling precise shunt regulation down to 1.24V. Its internal architecture supports both open-loop comparator operation (with integrated 1.24V reference) and closed-loop voltage regulation via resistive feedback between cathode and reference pins.
It operates without external compensation across its full cathode current range (100μA–70mA) and maintains stable regulation under capacitive loads up to 10nF when configured per TI's phase-margin guidelines. The device achieves ±11mV VREF deviation over –40°C to +125°C (Q-grade) and exhibits 0.1–0.5μA reference terminal current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF (25°C) | 1.24 V ±0.5% - enables accurate low-voltage adjustment starting at 1.24V, critical for 3.3V/2.5V rail monitoring |
| Cathode Current Range | 100 μA to 70 mA - supports ultra-low-power biasing and high-current shunt regulation without external gain stages |
| Operating Temperature | –40°C to +125°C - qualified for automotive and industrial environments requiring extended thermal robustness |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under load transients in feedback control loops |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error, enabling high-impedance feedback networks |
| VREF vs Cathode Voltage | –1.5 to –2.7 mV/V - quantifies supply rejection; lower magnitude improves stability in variable-input SMPS designs |
| Off-State Cathode Current | 0.02–0.1 μA - reduces standby power loss in always-on monitoring applications |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 5-pin surface-mount with exposed substrate connection on Pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (NC) | No internal connection | Must be left unconnected; no electrical function or thermal path |
| Pin 2 (Substrate) | Internal substrate tie | Must connect to ANODE or leave floating; not electrically isolated from ANODE |
| Pin 3 (CATHODE) | Shunt current input/output | Sinks regulated current; connects to SMPS output node or optocoupler LED anode |
| Pin 4 (REF) | Reference input threshold | Compares against internal 1.24V bandgap; requires ≥0.1μA bias current for proper operation |
| Pin 5 (ANODE) | Common return path | Typically grounded; serves as current return for cathode sink and reference bias paths |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates from 1.24V - enables use in sub-2V systems where TL431 (2.5V) is unusable |
| B-grade precision | ±0.5% VREF tolerance at 25°C - reduces calibration overhead in precision ADC references and sensor signal chains |
| Ultra-low IK(min) | 100 μA minimum cathode current - allows regulation in micropower battery-backed circuits and low-IQ PSUs |
| Integrated comparator mode | Open-loop gain >100 dB - eliminates need for external op-amp + reference in voltage monitor ICs |
| Stable without output capacitor | Internally compensated - simplifies layout in space-constrained isolated supplies; avoids capacitor aging effects |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
|
Use Scenario: Providing stable reference to 12–16-bit SAR or delta-sigma ADCs in industrial PLC modules. IC Role / Device Role / Timing Role: Precision shunt reference generating VREF = 1.24V × (1 + R1/R2) with <10ppm/°C drift contribution. Use Value: Enables ±0.5 LSB accuracy over temperature without trimming, leveraging B-grade tolerance and low thermal coefficient. |
Use Scenario: Regulating 3.3V output in isolated AC/DC flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Error amplifier + reference in secondary-side feedback loop; compares scaled output against 1.24V and drives optocoupler LED. Use Value: Achieves <±1% output regulation at light load (100μA IK) and supports fast transient response due to 0.25Ω zKA. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
|
Use Scenario: Replacing 1.2V–5.6V Zener diodes in FPGA I/O bank biasing and LDO enable circuits. IC Role / Device Role / Timing Role: Adjustable shunt clamp with sharp turn-on knee and <0.1μA off-state leakage. Use Value: Reduces board area by 40% (vs SOT-23-3) and eliminates Zener leakage variability across voltage grades. |
Use Scenario: Monitoring 1.8V core voltage in microcontroller subsystems for brownout detection. IC Role / Device Role / Timing Role: Comparator with built-in 1.24V reference; triggers reset when VIN drops below threshold set by R1/R2 divider. Use Value: Integrates reference and comparator in one SC-70 device, cutting BOM count and improving threshold accuracy vs discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BIDCKR | Same B-grade accuracy and electrical specs; SC-70-6 package with NC and substrate pins repositioned | Smaller 2.00 mm × 1.25 mm footprint; requires different PCB layout but identical circuit design | Select for ultra-dense layouts where DBV's 2.90 mm × 1.60 mm is prohibitive |
| TLVH432BIDBVT | Identical core specs; differs only in SOT-23-3 pinout (REF/CATHODE/ANODE order vs DBV's CATHODE/substrate/REF/ANODE/ANODE) | Requires PCB redesign due to non-interchangeable pin mapping; same thermal performance (RθJA = 206°C/W) | Choose only when legacy SOT-23-3 footprint is fixed and DBV's 5-pin layout cannot be accommodated |
Compared with TLVH431BIDBVT, TLVH431BIDCKR offers 40% smaller area with identical performance, while TLVH432BIDBVT provides pinout compatibility with legacy 3-pin designs but mandates layout revision-neither is pin-compatible with TLVH431BIDBVT.
Availability
TLVH431BIDBVT is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and precision data acquisition systems requiring stable component supply across extended temperature ranges.
Supply support for TLVH431BIDBVT 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 and embedded processing solutions, with over 50 years of innovation in precision analog ICs and power management.
The TLVH431 family was designed specifically for low-voltage, high-accuracy shunt regulation in isolated power supplies and precision instrumentation-addressing limitations of the legacy TL431 in sub-2V applications.
FAQ
What is the reference voltage tolerance of TLVH431BIDBVT at 25°C?
The TLVH431BIDBVT 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 precision is specified in Section 5.7 of the TI datasheet and applies across all operating conditions unless otherwise noted. TLVH431BIDBVT maintains this accuracy without external calibration, making it suitable for high-resolution measurement systems.
Can TLVH431BIDBVT operate with cathode currents below 100μA?
No-TLVH431BIDBVT requires a minimum cathode current of 100μA to maintain regulation, as confirmed in Section 5.5 (IK(min)) and Figure 5-5 of the datasheet. Operation below this threshold results in degraded gain and unstable reference behavior. TLVH431BIDBVT must be biased above 100μA across its full temperature range (–40°C to +125°C) to ensure functional compliance.
What package type does TLVH431BIDBVT use, and what are its dimensions?
TLVH431BIDBVT uses the SOT-23-5 (DBV) package with nominal body dimensions of 2.90 mm × 1.60 mm, as documented in the "Device Information" table. It features five terminals including a dedicated substrate connection on Pin 2. This package is distinct from SC-70 (DCK) and SOT-23-3 (DBZ) variants used by other TLVH431 family members.
How does TLVH431BIDBVT differ from TLVH432BIDBVT?
TLVH431BIDBVT and TLVH432BIDBVT share identical electrical specifications-including VREF, IK range, and thermal performance-but differ exclusively in pin configuration. TLVH431BIDBVT uses a 5-pin SOT-23 layout (CATHODE/substrate/REF/ANODE/ANODE), while TLVH432BIDBVT uses a 3-pin SOT-23 variant with REF/CATHODE/ANODE ordering. TLVH431BIDBVT is not pin-compatible with TLVH432BIDBVT.
Is an output capacitor required for stability with TLVH431BIDBVT?
No-TLVH431BIDBVT is internally compensated and stable without an output capacitor between cathode and anode, as stated in Section 7.3. However, if added for noise filtering or transient suppression, capacitor selection must follow TI's phase-margin curves (Figures 5-15 to 5-17) to avoid oscillation. TLVH431BIDBVT's stability margin is validated up to 10nF under typical operating conditions.
TLVH431BIDBVT 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TLVH431BIDBVT FAQ
1.How can I place an order for TLVH431BIDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431BIDBVT 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 TLVH431BIDBVT reliable?
The price and inventory of TLVH431BIDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BIDBVT is usually 5 days.
3.What payment methods are accepted for TLVH431BIDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431BIDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431BIDBVT?
TLVH431BIDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431BIDBVT 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 TLVH431BIDBVT?
For technical support, including TLVH431BIDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BIDBVT requirements.
6.How does Aetrix verify that TLVH431BIDBVT is sourced from the original manufacturer or authorized distributors?
All TLVH431BIDBVT 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 TLVH431BIDBVT meets industry standards.
7.What is the process for return or replacement of TLVH431BIDBVT?
All TLVH431BIDBVT units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BIDBVT, 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 TLVH431BIDBVT part is unused and in its original packaging.
Return procedure for TLVH431BIDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431BIDBVT Tags
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