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Texas Instruments TLVH431CDBVT
- Part No.:
- TLVH431CDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLVH431CDBVT.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:900
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Product details
Overview
TLVH431CDBVT from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-23-5 package, providing 1.24 V reference voltage with ±0.5% initial tolerance at 25°C, 100 μA to 70 mA cathode current range, and operation down to 1.24 V anode-to-cathode voltage - used for secondary-side regulation in isolated 3.3 V flyback SMPSs.
For engineers reviewing the TLVH431CDBVT datasheet, TLVH431CDBVT pinout, TLVH431CDBVT application, or TLVH431CDBVT equivalent, key selection criteria include reference accuracy over temperature (±12 mV max deviation), ultra-low reference input current (0.1–0.5 μA), dynamic impedance (0.25 Ω typical), and compatibility with optocoupler-based feedback in space-constrained industrial power supplies.
Technical Context
The TLVH431CDBVT implements a precision bandgap reference and high-gain transconductance amplifier in a 3-terminal shunt topology. Its internal Darlington output stage enables sharp turn-on behavior and stable regulation without external compensation capacitors across cathode-anode.
It operates in two functional modes: open-loop comparator mode (reference pin compared to internal 1.24 V) and closed-loop shunt regulator mode (feedback from cathode to reference pin sets output voltage from 1.24 V to 18 V via two external resistors). The SOT-23-5 package includes dedicated NC and substrate pins for enhanced thermal and noise performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V nominal at 25°C; ±0.5% tolerance (TLVH431C grade) enables accurate low-voltage setpoints in precision feedback loops. |
| VREF Deviation (Full Temp) | ±12 mV over 0°C to +70°C; supports stable regulation in commercial-temperature industrial control and power management. |
| Cathode Current Range | 100 μA to 70 mA; allows operation with minimal bias current in ultra-low-power monitoring while sustaining high-current regulation. |
| Dynamic Impedance | 0.25 Ω typical; ensures tight output voltage regulation under load transients in switching power supply error amplifiers. |
| Reference Input Current | 0.1–0.5 μA; minimizes resistor-divider loading error and enables high-impedance feedback networks for improved accuracy. |
| Operating Cathode Voltage | 1.24 V to 18 V; supports direct replacement of Zener diodes and enables adjustable output rails up to 18 V with two resistors. |
| Temperature Range | 0°C to +70°C (C-grade); qualified for commercial applications including consumer electronics and non-automotive embedded systems. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads; includes dedicated substrate connection (Pin 2) for thermal and noise control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: NC | No internal connection | Unused terminal; must be left floating or tied to ground per layout best practices to avoid parasitic coupling. |
| Pin 2: Substrate | Internal die substrate connection | Must be connected to ANODE (Pin 5) or left open; provides thermal path and reduces noise sensitivity in high-precision references. |
| Pin 3: CATHODE | Shunt current sink / output node | Primary current-handling terminal; connects to feedback network or optocoupler LED anode in isolated SMPS designs. |
| Pin 4: REF | Reference input / threshold sense | High-impedance input sensing point; voltage at this pin is regulated to 1.24 V relative to ANODE in closed-loop operation. |
| Pin 5: ANODE | Common return / ground reference | Low-impedance return path; serves as voltage reference for both REF and CATHODE terminals; typically tied to system ground. |
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 legacy TL431 cannot function. |
| Ultra-low reference current | 0.1–0.5 μA input current minimizes divider resistor values and associated thermal noise, improving ADC reference stability. |
| Stable without output capacitor | Internally compensated design eliminates need for cathode-anode bypass capacitor - simplifies layout and improves reliability in space-constrained PCBs. |
| Sharp turn-on characteristic | Darlington output stage delivers fast response (<1 µs rise time in pulse tests) - critical for overvoltage detection and fast comparator applications. |
| Wide cathode current range | 100 μA minimum cathode current enables operation in micropower battery monitors; 70 mA maximum supports robust regulation in 5 W+ flyback supplies. |
Applications
| Secondary-Side Regulation (Isolated Flyback) | Zener Diode Replacement |
|---|---|
|
Use Scenario: Voltage feedback loop in 3.3 V isolated flyback converter using optocoupler coupling to primary-side controller. IC Role / Device Role / Timing Role: Adjustable shunt regulator and error amplifier - compares output-derived voltage against internal 1.24 V reference and sinks cathode current to adjust optocoupler LED brightness. Use Value: Enables regulation down to 2.7 V output (1.24 V + 1.4 V LED drop); ±0.5% VREF tolerance ensures <±1% output accuracy across line/load/temperature. |
Use Scenario: On-board voltage clamping and rail monitoring in low-power microcontroller subsystems. IC Role / Device Role / Timing Role: Precision shunt reference - replaces discrete Zener diodes with superior temperature stability and lower leakage (0.02–0.1 μA off-state). Use Value: Reduces board area by >40% vs TO-92 Zeners; 0.25 Ω dynamic impedance maintains tighter regulation under varying load conditions. |
| Adjustable Voltage Reference for ADCs | Power-Rail Voltage Monitor |
|
Use Scenario: External reference source for 12-bit SAR ADC in industrial sensor interface with 0–5 V input range. IC Role / Device Role / Timing Role: Programmable reference generator - configured with R1/R2 to deliver precise 2.500 V or 4.096 V reference voltage to ADC REF+ pin. Use Value: 0.1–0.5 μA reference current avoids significant divider loading error; ±12 mV VREF drift over 0°C–70°C limits ADC full-scale error to <0.5 LSB. |
Use Scenario: Undervoltage lockout (UVLO) and overvoltage protection circuit for 5 V FPGA core rail. IC Role / Device Role / Timing Role: Comparator with integrated reference - REF pin biased to monitor rail voltage; cathode pulled high to trigger reset when rail drops below 4.75 V. Use Value: Eliminates external reference IC; 100 μA minimum cathode current ensures reliable latching even during brownout events with weak pull-up sources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt-regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431IDBVT | Same SOT-23-5 package and circuit architecture, but rated for –40°C to +85°C industrial temperature range; VREF tolerance remains ±0.5%, but VREF deviation increases to ±20 mV over full range. | Required for extended-temperature industrial equipment (e.g., motor drives, outdoor gateways); not suitable for cost-sensitive commercial-only designs. | Select TLVH431IDBVT when operating ambient exceeds +70°C or when long-term thermal stability across wider range is mandatory. |
| TLVH431ACDBVT | Same package and temperature grade (0°C to +70°C), but A-grade (±1%) VREF tolerance instead of C-grade (±0.5%); otherwise identical electrical specs and pinout. | Acceptable for non-critical power supervision or general-purpose voltage setting where ±1% output accuracy suffices. | Choose TLVH431ACDBVT to reduce BOM cost where tighter reference accuracy is unnecessary - e.g., non-precision biasing or coarse rail monitoring. |
Compared with TLVH431CDBVT, TLVH431IDBVT extends thermal capability at the cost of higher VREF drift, while TLVH431ACDBVT trades 0.5% accuracy for lower unit cost - enabling tiered design choices based on environmental stress and precision requirements without PCB redesign.
Availability
TLVH431CDBVT is available at Aetrix Electronics and suitable for commercial-temperature power supply feedback, precision analog reference generation, and low-voltage rail monitoring requiring stable component supply and consistent parametric performance.
Supply support for TLVH431CDBVT 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 and power control ICs.
The TLVH431 product line was designed specifically for low-voltage, high-accuracy shunt regulation in space-constrained and thermally demanding applications - extending the TL431 architecture to 1.24 V operation while maintaining robustness and ease of use.
FAQ
What is the reference voltage tolerance of TLVH431CDBVT at 25°C?
The TLVH431CDBVT has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal VREF with a range of 1.234 V to 1.246 V. This C-grade specification is confirmed in Section 5.7 of the TI SLVS555N datasheet and applies exclusively to the TLVH431C variant in SOT-23-5 packaging. TLVH431CDBVT maintains this tolerance across its rated 0°C to +70°C operating range.
Can TLVH431CDBVT operate with cathode voltage below 2.5 V?
Yes, TLVH431CDBVT is explicitly designed for low-voltage operation down to 1.24 V cathode-to-anode voltage - significantly lower than the 2.5 V minimum of the TL431. It regulates stably at 1.24 V with ≥100 μA cathode current, making it suitable for 1.8 V, 2.5 V, and 3.3 V systems. This capability is documented in the "Features" section and validated in Figure 5-3 of the SLVS555N datasheet.
Does TLVH431CDBVT require an output capacitor for stability?
No, TLVH431CDBVT is internally compensated and does not require an output capacitor between cathode and anode for basic stability. Its architecture eliminates the need for external compensation in standard shunt regulator configurations. However, if a capacitive load is added, Figures 5-15 through 5-17 in the datasheet provide phase-margin guidance to maintain stability under those specific conditions.
What is the function of Pin 2 (Substrate) on TLVH431CDBVT?
Pin 2 on TLVH431CDBVT is the internal die substrate connection, not a signal pin. Per TI's Pin Functions table and Figure 4-1, it must be connected to ANODE (Pin 5) or left electrically open - never driven independently. This connection improves thermal dissipation and reduces substrate noise coupling, which is critical for high-accuracy reference performance in noisy power environments.
How does TLVH431CDBVT differ from TLVH432 variants?
TLVH431CDBVT and TLVH432 share identical electrical specifications and reference core, but differ in pinout: TLVH431 uses SOT-23-5 (5-pin) with dedicated NC and substrate pins, while TLVH432 uses standard 3-pin SOT-23 or SOT-89 packages. TLVH431CDBVT's 5-pin layout enables better thermal management and lower noise in precision applications, whereas TLVH432 prioritizes footprint compatibility with legacy 3-pin layouts.
TLVH431CDBVT 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:
- ±1.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TLVH431CDBVT FAQ
1.How can I place an order for TLVH431CDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431CDBVT 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 TLVH431CDBVT reliable?
The price and inventory of TLVH431CDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431CDBVT is usually 5 days.
3.What payment methods are accepted for TLVH431CDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431CDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431CDBVT?
TLVH431CDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431CDBVT 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 TLVH431CDBVT?
For technical support, including TLVH431CDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431CDBVT requirements.
6.How does Aetrix verify that TLVH431CDBVT is sourced from the original manufacturer or authorized distributors?
All TLVH431CDBVT 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 TLVH431CDBVT meets industry standards.
7.What is the process for return or replacement of TLVH431CDBVT?
All TLVH431CDBVT units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431CDBVT, 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 TLVH431CDBVT part is unused and in its original packaging.
Return procedure for TLVH431CDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431CDBVT Tags
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