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Texas Instruments TLVH431BQDCKR
- Part No.:
- TLVH431BQDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TLVH431BQDCKR.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,975
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Product details
Overview
TLVH431BQDCKR from Texas Instruments is a low-voltage adjustable precision shunt regulator in SC-70 package, featuring 0.5% reference voltage tolerance at 25°C, 1.24 V nominal reference voltage, 100 μA to 70 mA cathode current range, and operation from –40°C to +125°C. It serves as an integrated voltage reference and error amplifier in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH431BQDCKR datasheet, TLVH431BQDCKR pinout, TLVH431BQDCKR application, or TLVH431BQDCKR equivalent, key selection criteria include initial VREF accuracy, thermal stability over industrial/automotive temperature ranges, dynamic impedance (0.25 Ω), minimum cathode current (100 μA), and SC-70 footprint compatibility with space-constrained PCB layouts.
Technical Context
The TLVH431BQDCKR implements a three-terminal shunt-regulator architecture with an internal 1.24 V bandgap reference and high-gain transconductance amplifier driving a Darlington output stage. Its open-loop comparator mode enables voltage monitoring without external feedback, while closed-loop operation with resistive divider feedback achieves precise output voltage regulation from VREF to 18 V.
It operates down to 1.24 V cathode-anode voltage, supports stable regulation with no mandatory output capacitor, and maintains 0.25 Ω typical dynamic impedance across 0.1 mA–70 mA cathode current. The SC-70 package provides 40% smaller footprint than SOT-23-3 while retaining full electrical performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF (25°C) | 1.24 V ±0.5% - sets precision threshold for feedback or comparator operation |
| VREF Deviation (–40°C to +125°C) | ±31 mV - defines worst-case reference drift in automotive/industrial environments |
| Cathode Current Range | 100 μA to 70 mA - enables regulation at ultra-low bias (e.g., standby power) and robust load handling |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under dynamic load steps |
| Reference Input Current | 0.1–0.5 μA - minimizes divider resistor loading error in high-impedance feedback networks |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial control applications |
| Output Voltage Range | VREF to 18 V - achieved via external resistor divider, supporting wide-range adjustable supplies |
Pinout & Package
TLVH431BQDCKR uses the 6-pin SC-70 (DCK) package with 2.00 mm × 1.25 mm body size. Pin 2 is substrate-connected and must be tied to ANODE or left open; pins 4 and 5 are NC (no internal connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current sink input | Primary current path; voltage at this node is regulated relative to ANODE |
| ANODE (Pin 6) | Common reference terminal | Typically connected to system ground or return path; defines voltage reference point |
| REF (Pin 3) | Feedback input | Senses divided output voltage; device adjusts CATHODE current to hold REF = 1.24 V |
| NC (Pins 4, 5) | No internal connection | Must remain unconnected; no routing or thermal tie required |
| Substrate (Pin 2) | Die attachment pad | Electrically tied to ANODE internally; must be connected to ANODE net or left floating |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates down to 1.24 V cathode-anode differential - enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 cannot function |
| Ultra-low reference current | 0.1–0.5 μA - reduces power loss and resistor-divider error in high-impedance feedback designs |
| Stable without output capacitor | Internally compensated - eliminates need for external capacitor in most shunt regulator configurations |
| Sharp turn-on characteristic | High open-loop gain and Darlington output - delivers fast response in comparator and overvoltage detection modes |
| Automotive-grade temperature range | –40°C to +125°C operation - meets AEC-Q100 stress test requirements for under-hood electronics |
Applications
| Secondary-Side Regulation in Isolated Flyback SMPS | Zener Diode Replacement |
|---|---|
Use Scenario: Used with optocoupler in feedback loop of 3.3 V isolated flyback converter to regulate output voltage with tight accuracy. IC Role / Device Role / Timing Role: Acts as combined voltage reference and error amplifier, comparing sampled output to internal 1.24 V reference and adjusting optocoupler LED current. Use Value: Enables regulation as low as 2.7 V output (1.24 V + optocoupler VF) and improves transient response vs discrete Zener + op-amp solutions. | Use Scenario: Replaces low-voltage Zener diodes (e.g., 2.4 V, 3.3 V) in on-board regulation and voltage clamping circuits. IC Role / Device Role / Timing Role: Functions as programmable shunt regulator with sharp knee and low leakage (<0.1 μA off-state). Use Value: Reduces leakage current by >90% versus standard Zeners, improving battery life in always-on monitoring circuits. |
| Voltage Monitoring for Power Rails | Adjustable Reference for Data Converters |
Use Scenario: Monitors 1.8 V or 2.5 V core supply rails in microcontrollers and FPGAs to trigger reset or fault signals. IC Role / Device Role / Timing Role: Operates in open-loop comparator mode, asserting fault when rail drops below programmed threshold. Use Value: Eliminates need for external reference and comparator IC; 0.5% VREF tolerance ensures accurate trip points across temperature. | Use Scenario: Provides precise, adjustable reference voltage for SAR ADCs and DACs requiring 1.24–5 V input range. IC Role / Device Role / Timing Role: Supplies stable, low-noise reference to converter analog front-end via buffered resistive divider. Use Value: 0.25 Ω dynamic impedance and <1 μV/√Hz noise ensure minimal code-width variation and high effective resolution. |
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 SC-70 package and 0.5% VREF tolerance, but rated for –40°C to +85°C (I-grade) instead of Q-grade (–40°C to +125°C) | Not qualified for extended-temperature automotive or industrial control applications | Select TLVH431BIDCKR only if ambient operating temperature remains ≤85°C |
| TLVH431BCDCKR | Same SC-70 package and 0.5% VREF tolerance, but rated for 0°C to +70°C (C-grade); lower cost | Restricted to commercial-temperature environments; unsuitable for automotive or outdoor deployments | Choose TLVH431BCDCKR for cost-sensitive consumer electronics with controlled thermal environments |
Compared with TLVH431BQDCKR, TLVH431BIDCKR offers identical electrical performance but reduced thermal qualification, while TLVH431BCDCKR further sacrifices temperature range for cost-making TLVH431BQDCKR the sole choice for full automotive-grade reliability in compact SC-70 layout.
Availability
TLVH431BQDCKR is available at Aetrix Electronics and suitable for isolated power supplies, voltage supervision circuits, and precision reference designs requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH431BQDCKR 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 delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.
The TLVH431 family was designed specifically for low-voltage, high-accuracy shunt regulation in space-constrained and thermally demanding applications-including secondary-side feedback in isolated DC/DC converters and precision voltage monitoring.
FAQ
What is the reference voltage tolerance of TLVH431BQDCKR at 25°C?
The TLVH431BQDCKR 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 grade-B tolerance is specified in Section 5.7 of the TI datasheet SLVS555N and applies across the full SC-70 packaged variant. The tighter tolerance directly improves accuracy in feedback loops and voltage-monitoring thresholds.
Can TLVH431BQDCKR operate with cathode-to-anode voltage below 2.5 V?
Yes, TLVH431BQDCKR is explicitly designed for low-voltage operation down to 1.24 V cathode-to-anode differential, unlike the TL431 which requires ≥2.5 V. This enables direct use in 1.8 V and 2.5 V systems. Operation at 1.24 V requires ≥100 μA cathode current and proper thermal management per the datasheet's recommended operating conditions.
What is the minimum cathode current required for regulation in TLVH431BQDCKR?
The minimum cathode current required for regulation in TLVH431BQDCKR is 100 μA at 25°C, increasing to 120 μA at 125°C per Figure 5-5. Below this threshold, the device exits regulation and exhibits degraded gain and reference accuracy. Designers must ensure external bias networks supply sufficient current across the full temperature range.
Does TLVH431BQDCKR require an output capacitor for stability?
No, TLVH431BQDCKR is internally compensated and stable without an output capacitor between CATHODE and ANODE in standard shunt regulator configurations. However, if an output capacitor is added, Figures 5-15 through 5-17 in the datasheet provide phase-margin guidance for selecting values that maintain stability under varying capacitive loads and cathode voltages.
How does the SC-70 package of TLVH431BQDCKR compare to SOT-23-3 in size and thermal performance?
The TLVH431BQDCKR SC-70 package measures 2.00 mm × 1.25 mm, offering a 40% smaller footprint than the 2.92 mm × 1.30 mm SOT-23-3 (DBZ). Thermally, its junction-to-ambient resistance is 259°C/W - higher than DBZ's 206°C/W - so power dissipation must be limited to ≤150 mW at 85°C ambient to stay within safe junction temperature limits.
TLVH431BQDCKR 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:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
TLVH431BQDCKR FAQ
1.How can I place an order for TLVH431BQDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431BQDCKR 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 TLVH431BQDCKR reliable?
The price and inventory of TLVH431BQDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BQDCKR is usually 5 days.
3.What payment methods are accepted for TLVH431BQDCKR?
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TLVH431BQDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431BQDCKR 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 TLVH431BQDCKR?
For technical support, including TLVH431BQDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BQDCKR requirements.
6.How does Aetrix verify that TLVH431BQDCKR is sourced from the original manufacturer or authorized distributors?
All TLVH431BQDCKR 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 TLVH431BQDCKR meets industry standards.
7.What is the process for return or replacement of TLVH431BQDCKR?
All TLVH431BQDCKR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BQDCKR, 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 TLVH431BQDCKR part is unused and in its original packaging.
Return procedure for TLVH431BQDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431BQDCKR Tags
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