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Texas Instruments TLVH431BCLPR
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- Part No.:
- TLVH431BCLPR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
TLVH431BCLPR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
TLVH431BCLPR from Texas Instruments is a low-voltage adjustable precision shunt regulator with 0.5% reference voltage tolerance at 25°C, 1.24 V nominal reference voltage, 100 μA minimum cathode current for regulation, and –40°C to +125°C operating temperature range. It functions as an integrated voltage reference and error amplifier in isolated flyback SMPS feedback loops, enabling stable secondary-side regulation down to 2.7 V in 3.3-V systems.
For engineers reviewing the TLVH431BCLPR datasheet, TLVH431BCLPR pinout, TLVH431BCLPR application, or TLVH431BCLPR equivalent, key selection considerations include its 0.25 Ω dynamic impedance, ultra-low 0.1–0.5 μA reference terminal current, SC-70 package footprint (2.00 mm × 1.25 mm), and compatibility with optocoupler-based isolated feedback architectures.
Technical Context
The TLVH431BCLPR implements a precision bandgap reference and high-gain transconductance amplifier in a 3-terminal shunt topology. Its internal Darlington output stage delivers sharp turn-on characteristics and enables operation with cathode currents as low as 100 μA while maintaining regulation across –40°C to +125°C.
It operates in two distinct functional modes: open-loop comparator mode (with integrated 1.24 V reference) and closed-loop shunt regulator mode (using external resistor divider feedback from cathode to reference pin). The device is internally compensated and stable without 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 ±0.5% at 25°C - sets precise regulation threshold for feedback networks |
| Reference Voltage Deviation | ±11 mV over –40°C to +125°C - ensures stable setpoint across automotive/industrial thermal range |
| Dynamic Impedance | 0.25 Ω typical - minimizes output voltage variation under load transients |
| Cathode Current Range | 100 μA to 70 mA - supports low-power monitoring and higher-current shunt regulation |
| Reference Terminal Current | 0.1–0.5 μA - reduces divider resistor power loss and improves accuracy in high-impedance feedback |
| Output Voltage Range | VREF to 18 V - adjustable via two external resistors, enabling wide-range voltage referencing |
| ESD Rating (HBM) | ±2000 V - meets industrial handling requirements without additional protection circuitry |
Pinout & Package
TLVH431BCLPR is packaged in SC-70 (DCK), a 6-pin surface-mount package measuring 2.00 mm × 1.25 mm with 0.65 mm pitch. Pin 1 is CATHODE, Pin 2 is substrate-connected (must tie to ANODE or leave open), Pin 3 is REF, Pin 4 and Pin 5 are NC (no internal connection), and Pin 6 is ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input / output node | Primary current path; sinks regulated current to maintain VREF at REF pin |
| Substrate (Pin 2) | Internal die substrate connection | Must be connected to ANODE or left floating; not electrically active otherwise |
| REF (Pin 3) | Reference input / feedback sense node | Senses voltage relative to ANODE; drives internal amplifier to regulate CATHODE current |
| NC (Pins 4, 5) | No internal connection | Unused; no electrical function; may be left unconnected or tied to ANODE for mechanical stability |
| ANODE (Pin 6) | Common return / ground reference | Reference point for all voltages; typically connected to system ground or power rail return |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates down to 1.24 V - enables use in 1.8-V, 2.5-V, and 3.3-V systems where TL431 cannot operate |
| Ultra-low reference current | 0.1–0.5 μA - permits high-value feedback resistors (>1 MΩ), reducing power consumption and thermal drift |
| Wide cathode current range | 100 μA–70 mA - supports both micropower monitoring and robust shunt regulation in SMPS |
| High-temperature grade | –40°C to +125°C operation - qualified for under-hood automotive and industrial control applications |
| Integrated comparator function | Open-loop gain >100 dB - allows direct use as precision voltage monitor without external op-amp |
Applications
| Isolated Flyback SMPS Regulation | Low-Voltage Zener Replacement |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in 3.3-V isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Precision shunt regulator and error amplifier that compares output-derived voltage against internal 1.24 V reference. Use Value: Enables regulation as low as 2.7 V output (1.24 V + optocoupler LED drop); eliminates need for external reference or op-amp. |
Use Scenario: On-board voltage clamping and rail monitoring in battery-powered IoT sensors and portable medical devices. IC Role / Device Role / Timing Role: Adjustable shunt reference replacing discrete Zener diodes with superior leakage and tempco performance. Use Value: 0.02–0.1 μA off-state cathode current reduces standby power; 0.5% initial tolerance improves ADC reference accuracy. |
| Adjustable Data Converter Reference | Power Rail Voltage Monitor |
|
Use Scenario: Programmable reference for SAR and delta-sigma ADCs requiring 1.5–5 V full-scale input range. IC Role / Device Role / Timing Role: Stable, low-noise voltage source setting ADC input range via resistor divider on REF and CATHODE pins. Use Value: 0.25 Ω dynamic impedance and <10 μVPP 0.1–10 Hz noise ensure sub-LSB reference stability for 16-bit+ converters. |
Use Scenario: Real-time monitoring of 1.8-V core supply in FPGA or microcontroller power domains. IC Role / Device Role / Timing Role: Comparator with integrated reference detecting undervoltage events below 1.71 V (–5% tolerance). Use Value: Eliminates external voltage divider and comparator; 100 μA min cathode current enables direct MCU GPIO wake-up signaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACLPR | 1% VREF tolerance at 25°C (vs. 0.5% for TLVH431BCLPR); identical SC-70 package and electrical specs otherwise | Acceptable where ±1% reference accuracy suffices (e.g., non-critical biasing, coarse monitoring) | Select TLVH431ACLPR when cost sensitivity outweighs need for highest-grade reference precision |
| TLVH431CDCKR | Standard grade (1.5% VREF tolerance); same SC-70 package but rated only for 0°C to 70°C operation | Limited to commercial-temperature applications (e.g., consumer electronics, office equipment) | Choose TLVH431CDCKR only for cost-driven, non-industrial designs with ambient <70°C |
Compared with TLVH431ACLPR and TLVH431CDCKR, TLVH431BCLPR provides the tightest initial reference tolerance and widest temperature qualification, making it the preferred choice for automotive, industrial, and high-accuracy analog signal chains where long-term stability and thermal robustness are critical.
Availability
TLVH431BCLPR is available at Aetrix Electronics and suitable for isolated SMPS regulation, precision data converter references, and low-voltage rail monitoring requiring stable component supply across extended temperature ranges.
Supply support for TLVH431BCLPR 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 specializing in analog, embedded processing, and power management ICs, with leadership in precision analog and industrial-grade components.
The TLVH431 family was designed specifically for low-voltage, high-accuracy shunt regulation in isolated power supplies, battery management, and sensor interface circuits-addressing limitations of legacy TL431 in modern 1.8-V–3.3-V systems.
FAQ
What is the reference voltage tolerance of TLVH431BCLPR at 25°C?
The TLVH431BCLPR 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 grade (denoted by "B") is the highest-precision option in the TLVH431 family and is specified in Section 5.7 of the TI datasheet SLVS555N.
Which package does TLVH431BCLPR use, and what are its dimensions?
TLVH431BCLPR uses the SC-70 (DCK) package: a 6-pin surface-mount outline measuring 2.00 mm × 1.25 mm with 0.65 mm lead pitch. Pin configuration is CATHODE–SUBSTRATE–REF–NC–NC–ANODE, and the substrate pin (Pin 2) must be connected to ANODE or left open per TI's pin function table.
Can TLVH431BCLPR replace a standard Zener diode in low-leakage applications?
Yes, TLVH431BCLPR serves as a high-performance Zener replacement with off-state cathode current as low as 0.02 μA at 18 V, versus typical Zener leakage of >1 μA. Its adjustable output (1.24 V–18 V), 0.25 Ω dynamic impedance, and integrated reference eliminate external components required by discrete Zeners.
What is the minimum cathode current required for regulation in TLVH431BCLPR?
The TLVH431BCLPR requires a minimum cathode current of 100 μA to maintain regulation, as specified in the "IK(min)" parameter across all temperature grades. At temperatures up to +125°C, this value remains ≤100 μA, enabling reliable operation in low-power isolated feedback paths.
How does TLVH431BCLPR behave in open-loop comparator mode?
In open-loop mode, TLVH431BCLPR acts as a comparator with integrated 1.24 V reference: when voltage at the REF pin exceeds VREF, the CATHODE sinks current to pull the external node low. Its high open-loop gain (>100 dB) and sharp turn-on enable precise voltage monitoring without external amplifiers.
TLVH431BCLPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
TLVH431BCLPR FAQ
1.How can I place an order for TLVH431BCLPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431BCLPR 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 TLVH431BCLPR reliable?
The price and inventory of TLVH431BCLPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BCLPR is usually 5 days.
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TLVH431BCLPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431BCLPR 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 TLVH431BCLPR?
For technical support, including TLVH431BCLPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BCLPR requirements.
6.How does Aetrix verify that TLVH431BCLPR is sourced from the original manufacturer or authorized distributors?
All TLVH431BCLPR 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 TLVH431BCLPR meets industry standards.
7.What is the process for return or replacement of TLVH431BCLPR?
All TLVH431BCLPR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BCLPR, 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 TLVH431BCLPR part is unused and in its original packaging.
Return procedure for TLVH431BCLPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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