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Texas Instruments TLVH431BCDCKR
- Part No.:
- TLVH431BCDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TLVH431BCDCKR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,166
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Product details
Overview
TLVH431BCDCKR from Texas Instruments is a low-voltage adjustable precision shunt regulator in SC-70 package, delivering 1.24 V reference voltage with ±0.5% initial tolerance at 25°C, 0.25 Ω typical dynamic impedance, and operation down to 100 μA cathode current - enabling use in 3.3 V isolated flyback SMPS secondary-side regulation.
For engineers reviewing the TLVH431BCDCKR datasheet, TLVH431BCDCKR pinout, TLVH431BCDCKR application, or TLVH431BCDCKR equivalent, key selection criteria include reference accuracy over –40°C to +125°C, ultra-low minimum cathode current for light-load efficiency, SC-70 footprint constraints, and compatibility with optocoupler-based feedback loops in compact power supplies.
Technical Context
The TLVH431BCDCKR 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 with no external compensation required across its 1.24 V to 18 V adjustable output range.
It operates in two distinct functional modes: open-loop comparator mode (using integrated reference for voltage monitoring) and closed-loop shunt regulator mode (with resistive feedback from cathode to reference pin), both supported across –40°C to +125°C with guaranteed thermal stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C - sets precise regulation threshold for feedback networks |
| Min Cathode Current | 100 μA - enables regulation under ultra-light loads, critical for standby efficiency |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage stability against load transients |
| Operating Temp Range | –40°C to +125°C - supports automotive and industrial ambient conditions without derating |
| Output Voltage Range | 1.24 V to 18 V - adjustable via two external resistors, replacing discrete Zener diodes |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error in precision feedback paths |
| Max Cathode Voltage | 20 V absolute max - defines safe operating margin for 18 V regulated outputs |
Pinout & Package
TLVH431BCDCKR uses the SC-70 (DCK) 6-pin package (2.00 mm × 1.25 mm), with pins 1, 2, and 3 assigned to CATHODE, ANODE, and REF respectively; pins 4 and 5 are NC; pin 2 is substrate-connected and must be tied to ANODE or left open.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CATHODE) | Shunt current input/output node | Primary current path for regulation; connects to feedback network or optocoupler LED anode |
| 2 (ANODE) | Common reference and substrate tie | Typically grounded; pin 2 must be connected to ANODE or left floating per datasheet |
| 3 (REF) | Reference input sensing node | Compares external voltage to internal 1.24 V reference; requires ≤0.5 μA bias current |
| 4, 5 (NC) | No internal connection | Not bonded; electrically isolated; no PCB routing required |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V - enables use in 1.8 V/2.5 V/3.3 V systems where TL431 cannot function |
| Ultra-small SC-70 footprint | 40% smaller than SOT-23-3 - saves board space in dense power supply layouts |
| Stable without output capacitor | Internally compensated - eliminates need for external capacitor, reducing BOM count and layout risk |
| Low leakage off-state current | 0.02–0.1 μA at 18 V - preserves battery life in always-on monitoring circuits |
| Sharp turn-on characteristic | High open-loop gain enables fast comparator response - suitable for overvoltage latch or brownout detection |
Applications
| Secondary-Side Regulation | Zener Diode Replacement |
|---|---|
|
Use Scenario: Isolated 3.3 V flyback converter with optocoupler feedback loop. IC Role / Device Role / Timing Role: Adjustable shunt reference and error amplifier on secondary side. Use Value: Enables regulation as low as 2.7 V output while maintaining ±1% accuracy over temperature and line. |
Use Scenario: On-board 5 V rail voltage monitoring with hysteresis. IC Role / Device Role / Timing Role: Precision comparator with integrated 1.24 V reference. Use Value: Replaces 5.1 V Zener + op-amp combo, cutting component count and leakage by >99%. |
| Data Converter Reference | Power Rail Monitoring |
|
Use Scenario: External reference for 12-bit SAR ADC in industrial sensor node. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage reference source. Use Value: 0.5% initial tolerance and <31 mV full-range deviation ensure <0.5 LSB reference error. |
Use Scenario: Undervoltage lockout (UVLO) circuit for microcontroller reset. IC Role / Device Role / Timing Role: Adjustable threshold detector with hysteresis. Use Value: Configurable trip point (1.24–18 V) and sub-100 μA quiescent current extend battery runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDCKR | 1% initial reference tolerance (vs. 0.5% for TLVH431BCDCKR); otherwise identical electrical specs and SC-70 packaging | Suitable where ±1% regulation accuracy suffices; lower cost for non-critical references | Select TLVH431ACDCKR when system-level tolerance budget allows relaxed reference accuracy |
| TLVH431BIDCKR | Same 0.5% tolerance and SC-70 package, but rated for –40°C to +85°C (vs. –40°C to +125°C for TLVH431BCDCKR) | Valid for commercial/industrial environments but not extended-temperature automotive or industrial control | Choose TLVH431BIDCKR only if full –40°C to +125°C operation is not required |
Compared with TLVH431ACDCKR and TLVH431BIDCKR, TLVH431BCDCKR provides the highest initial accuracy and widest temperature range in the SC-70 package, making it optimal for high-reliability power supervision and precision analog systems where drift and long-term stability are critical.
Availability
TLVH431BCDCKR is available at Aetrix Electronics and suitable for isolated flyback SMPS design, precision data converter reference circuits, and low-power voltage monitoring applications requiring stable component supply and long-term lifecycle support.
Supply support for TLVH431BCDCKR 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 and embedded processing technologies, with leadership in precision analog ICs and power management solutions.
TLVH431BCDCKR belongs to TI's precision shunt reference product line, designed specifically for low-voltage, low-current regulation and integrated reference applications in space-constrained power and signal conditioning systems.
FAQ
What is the reference voltage tolerance of TLVH431BCDCKR at 25°C?
The TLVH431BCDCKR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal reference with min/max values of 1.234 V and 1.246 V. This grade-B tolerance is confirmed in Section 5.7 of the official TI datasheet SLVS555N and applies across all temperature grades (C/I/Q) of the TLVH431B variant.
Can TLVH431BCDCKR operate with cathode currents below 1 mA?
Yes, TLVH431BCDCKR is specified to regulate stably down to 100 μA cathode current - significantly lower than the 1 mA minimum required by legacy TL431 devices. This capability is validated in Figure 5-5 and Section 5.5, enabling efficient light-load and standby operation in battery-powered and energy-sensitive designs.
What package type does TLVH431BCDCKR use, and what are its dimensions?
TLVH431BCDCKR uses the SC-70 (DCK) package, measuring 2.00 mm × 1.25 mm (nominal body size). This 6-pin package is documented in TI's Mechanical, Packaging, and Orderable Information section (page 23), and offers a 40% smaller footprint than standard SOT-23-3 packages.
Does TLVH431BCDCKR require an external output capacitor for stability?
No, TLVH431BCDCKR is internally compensated and remains stable without an external capacitor between cathode and anode. This is explicitly stated in Section 7.3 and verified in Figures 5-15 through 5-17, which show phase margin retention across capacitive loads up to 10 nF - simplifying layout and reducing component count.
How does TLVH431BCDCKR differ from TLVH432 variants?
TLVH431BCDCKR and TLVH432 variants share identical electrical specifications but differ in pinout: TLVH431 uses CATHODE–ANODE–REF (pin 1–2–3), while TLVH432 uses CATHODE–REF–ANODE. The DCK package is assigned to TLVH431 only; TLVH432 is offered in DBZ (SOT-23-3) and PK (SOT-89) packages per TI's orderable addendum.
TLVH431BCDCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- 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:
- Surface Mount
- Supplier Device Package:
- SC-70-6
TLVH431BCDCKR FAQ
1.How can I place an order for TLVH431BCDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431BCDCKR 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 TLVH431BCDCKR reliable?
The price and inventory of TLVH431BCDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BCDCKR is usually 5 days.
3.What payment methods are accepted for TLVH431BCDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431BCDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431BCDCKR?
TLVH431BCDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431BCDCKR 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 TLVH431BCDCKR?
For technical support, including TLVH431BCDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BCDCKR requirements.
6.How does Aetrix verify that TLVH431BCDCKR is sourced from the original manufacturer or authorized distributors?
All TLVH431BCDCKR 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 TLVH431BCDCKR meets industry standards.
7.What is the process for return or replacement of TLVH431BCDCKR?
All TLVH431BCDCKR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BCDCKR, 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 TLVH431BCDCKR part is unused and in its original packaging.
Return procedure for TLVH431BCDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431BCDCKR Tags
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