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Texas Instruments TLVH431BCDCKTG4
- Part No.:
- TLVH431BCDCKTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TLVH431BCDCKTG4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,277
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Product details
Overview
TLVH431BCDCKTG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SC-70-6 package, featuring 1.24 V reference voltage (±0.5% at 25°C), 100 μA to 70 mA cathode current range, and operation from –40°C to +125°C. It replaces Zener diodes in secondary-side regulation of 3.3 V flyback SMPSs and serves as an integrated-reference comparator for power-rail monitoring.
For engineers reviewing the TLVH431BCDCKTG4 datasheet, TLVH431BCDCKTG4 pinout, TLVH431BCDCKTG4 application, or TLVH431BCDCKTG4 equivalent, key selection criteria include reference tolerance grade (B), ultra-small SC-70 footprint, cathode current headroom for isolated feedback loops, and thermal stability across automotive-grade temperature ranges.
Technical Context
The TLVH431BCDCKTG4 implements a bandgap-referenced error amplifier with Darlington output stage, enabling precise shunt regulation down to 1.24 V. Its open-loop gain supports comparator operation, while closed-loop behavior with external resistors sets output voltage from VREF to 18 V.
It operates with no external compensation required due to internal frequency compensation, exhibits 0.25 Ω typical dynamic impedance, and maintains stable regulation with cathode currents as low as 100 μA - significantly lower than TL431's 1 mA minimum.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C - enables accurate low-voltage adjustment without trimming |
| Cathode Current Range | 100 μA to 70 mA - supports micro-power biasing and high-current shunt regulation |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Dynamic Impedance | 0.25 Ω typical - ensures tight regulation under load transients in feedback circuits |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error in precision voltage-setting networks |
| Output Voltage Range | VREF to 18 V - set via two external resistors; supports wide-range programmable references |
| Supply Headroom | Min 1.24 V cathode-to-anode - allows operation from 1.8 V and 3.3 V rails where legacy TL431 fails |
Pinout & Package
TLVH431BCDCKTG4 uses the 6-pin SC-70 (DCK) package (2.00 mm × 1.25 mm), offering 40% smaller footprint than SOT-23-3. 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 input / output node | Sinks regulated current; connects to optocoupler LED anode in isolated SMPS feedback |
| ANODE (Pin 6) | Common return / ground reference | Typically connected to system ground; defines cathode voltage reference point |
| REF (Pin 3) | Feedback input / threshold sense | Compares external voltage divider ratio to internal 1.24 V reference; requires ≥0.1 μA bias |
| NC (Pins 4, 5) | No internal connection | Not bonded; must remain unconnected on PCB |
| Substrate (Pin 2) | Die attachment pad | Must be connected to ANODE or left floating; not electrically active but thermally significant |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24 V reference enables regulation from 1.8 V supply rails - critical for modern low-voltage SMPS designs |
| 0.5% initial reference tolerance (B grade) | Reduces need for post-assembly calibration in precision data converter references and voltage monitors |
| Ultra-small SC-70 package | 2.00 mm × 1.25 mm footprint saves board space in compact power modules and portable electronics |
| Stable without output capacitor | Internally compensated design eliminates external capacitor in most applications - simplifies layout and BOM |
| Wide cathode current range | 100 μA minimum supports energy-efficient standby modes; 70 mA max handles full-load feedback currents |
Applications
| Secondary-Side Regulation in Flyback SMPS | Zener Diode Replacement |
|---|---|
|
Use Scenario: Isolated 3.3 V output in AC/DC adapter with optocoupler feedback loop. IC Role / Device Role / Timing Role: Adjustable shunt regulator and error amplifier - compares sampled output voltage to 1.24 V reference and drives optocoupler LED. Use Value: Enables regulation as low as 2.7 V output (1.24 V + opto VF) with <±1% accuracy over –40°C to +125°C. |
Use Scenario: On-board 5 V rail monitoring with low-leakage voltage clamp. IC Role / Device Role / Timing Role: Precision shunt reference - sinks current when rail exceeds set threshold, replacing discrete Zener + resistor. Use Value: Cuts leakage current to ≤0.1 μA (vs >10 μA for 5 V Zener), improving standby efficiency in battery-backed systems. |
| Adjustable Reference for ADC/DAC | Comparator with Integrated Reference |
|
Use Scenario: Programmable gain stage reference for 16-bit SAR ADC in industrial sensor interface. IC Role / Device Role / Timing Role: Stable, low-drift voltage reference - sets full-scale input range via resistor divider on REF pin. Use Value: 0.25 Ω dynamic impedance and <12 mV tempco ensure <0.01% FS error drift over temperature. |
Use Scenario: Overvoltage detection circuit triggering shutdown at 3.6 V on a 3.3 V microcontroller rail. IC Role / Device Role / Timing Role: Open-loop comparator - REF pin biased to 3.6 V divider; CATHODE pulled high when threshold exceeded. Use Value: Eliminates external reference IC and reduces component count by 2–3 parts per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDCKR | 1% reference tolerance (A grade), same SC-70-6 package and electrical specs | Lower accuracy; suitable where ±1% regulation suffices and cost is prioritized | Choose TLVH431ACDCKR for non-critical biasing or cost-sensitive consumer power supplies |
| TLVH431BIDCKR | Identical 0.5% tolerance and SC-70-6 package, but rated for –40°C to +85°C (I grade) | Limited temperature range excludes under-hood automotive use but matches industrial control ambient | Choose TLVH431BIDCKR for industrial PLCs or telecom equipment operating below 85°C ambient |
Compared with TLVH431BCDCKTG4, TLVH431ACDCKR trades 0.5% tolerance for lower unit cost, while TLVH431BIDCKR retains B-grade accuracy but sacrifices extended high-temperature capability - both require identical PCB layout and resistor network design.
Availability
TLVH431BCDCKTG4 is available at Aetrix Electronics and suitable for secondary-side regulation in flyback SMPSs, precision voltage monitoring in automotive ECUs, and adjustable reference generation for high-resolution data converters requiring stable component supply and long-term parametric consistency.
Supply support for TLVH431BCDCKTG4 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 IC design.
The TLVH431 family was engineered to extend shunt regulator functionality to low-voltage systems - specifically targeting isolated DC/DC converters, battery-powered instrumentation, and automotive subsystems needing robust, compact voltage references.
FAQ
What is the reference voltage tolerance of TLVH431BCDCKTG4 at 25°C?
The TLVH431BCDCKTG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal VREF with min/max values of 1.234 V and 1.246 V. This B-grade accuracy is confirmed in Section 5.7 of the TI SLVS555N datasheet and applies specifically to the TLVH431BCDCKTG4 variant across its SC-70-6 package configuration.
Can TLVH431BCDCKTG4 operate with cathode current below 100 μA?
No - TLVH431BCDCKTG4 requires a minimum cathode current of 100 μA to maintain regulation, as specified in the "IK(min)" parameter (Section 5.5–5.7). Operation below this level results in insufficient open-loop gain and loss of reference accuracy; the device may enter high-impedance state or exhibit unstable turn-on behavior.
Is TLVH431BCDCKTG4 pin-compatible with TL431?
No - TLVH431BCDCKTG4 uses a 6-pin SC-70 package with distinct pinout (CATHODE/ANODE/REF/NC/NC/Substrate), whereas TL431 uses 3-pin TO-92 or SOIC packages with CATHODE/ANODE/REF ordering. Direct replacement requires PCB redesign; functional substitution is possible only with circuit-level adaptation.
Does TLVH431BCDCKTG4 require an external output capacitor for stability?
No - TLVH431BCDCKTG4 is internally compensated and stable without an output capacitor between CATHODE and ANODE, unlike many linear regulators. However, if a capacitor is added for noise filtering, Figures 5-15–5-17 in the datasheet provide phase-margin guidance for selecting values up to 10 nF depending on cathode voltage.
What is the maximum cathode voltage rating for TLVH431BCDCKTG4?
The absolute maximum cathode voltage (VKA) for TLVH431BCDCKTG4 is 20 V, referenced to the ANODE pin (Section 5.1). The recommended operating range extends from VREF (1.24 V) up to 18 V, making it suitable for adjustable references in 12 V and 15 V systems while maintaining margin against transient overvoltage events.
TLVH431BCDCKTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
TLVH431BCDCKTG4 FAQ
1.How can I place an order for TLVH431BCDCKTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431BCDCKTG4 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 TLVH431BCDCKTG4 reliable?
The price and inventory of TLVH431BCDCKTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BCDCKTG4 is usually 5 days.
3.What payment methods are accepted for TLVH431BCDCKTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431BCDCKTG4 transactions.
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4.How is shipping managed for TLVH431BCDCKTG4?
TLVH431BCDCKTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431BCDCKTG4 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 TLVH431BCDCKTG4?
For technical support, including TLVH431BCDCKTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BCDCKTG4 requirements.
6.How does Aetrix verify that TLVH431BCDCKTG4 is sourced from the original manufacturer or authorized distributors?
All TLVH431BCDCKTG4 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 TLVH431BCDCKTG4 meets industry standards.
7.What is the process for return or replacement of TLVH431BCDCKTG4?
All TLVH431BCDCKTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BCDCKTG4, 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 TLVH431BCDCKTG4 part is unused and in its original packaging.
Return procedure for TLVH431BCDCKTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431BCDCKTG4 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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