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Texas Instruments TLVH431ACDCKR
- Part No.:
- TLVH431ACDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TLVH431ACDCKR.pdf
- Description:
- IC VREF SHUNT ADJ 1% SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,905
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Product details
Overview
TLVH431ACDCKR from Texas Instruments is a low-voltage adjustable precision shunt regulator in SC-70 package, providing 1.24 V reference voltage with ±0.5% initial tolerance at 25°C, 0.25 Ω typical dynamic impedance, and operation from 1.24 V to 18 V output range. It serves as an error amplifier or voltage reference in isolated flyback SMPS feedback loops for 3.3 V systems.
For engineers reviewing the TLVH431ACDCKR datasheet, TLVH431ACDCKR pinout, TLVH431ACDCKR application, or TLVH431ACDCKR equivalent, key selection criteria include cathode current range (100 μA to 70 mA), thermal stability over –40°C to +125°C, ultra-small SC-70 footprint, and compatibility with optocoupler-based secondary-side regulation.
Technical Context
The TLVH431ACDCKR implements a precision bandgap reference and high-gain transconductance amplifier in a 3-terminal shunt topology. Its internal architecture forces the REF pin to 1.24 V when sufficient cathode current (≥100 μA) flows and feedback is applied between CATHODE and REF terminals.
It operates in two functional modes: open-loop comparator mode (with integrated 1.24 V reference) and closed-loop shunt regulator mode. Unlike the TL431, it achieves stable regulation down to 1.24 V supply headroom and requires no external compensation capacitor for basic operation.
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 |
| Output Voltage Range | 1.24 V to 18 V - adjustable via two external resistors without changing device |
| Cathode Current Range | 100 μA to 70 mA - enables low-power monitoring and high-current shunt regulation |
| Dynamic Impedance | 0.25 Ω typical - ensures tight voltage regulation under load transients |
| Operating Temperature | –40°C to +125°C - qualified for automotive and industrial environments |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error in precision applications |
| Line Regulation | –1.5 to –2.7 mV/V - quantifies reference voltage drift vs. cathode voltage variation |
Pinout & Package
TLVH431ACDCKR uses the SC-70 (DCK) 6-pin package (2.00 mm × 1.25 mm), with pins 1 (CATHODE), 2 (ANODE), 3 (REF), and internal NC/substrate connections on pins 4, 5, and 6 per TI SLVS555N Figure 4-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CATHODE | Shunt current input / output node | Primary current path; sinks regulated current to maintain REF = 1.24 V |
| 2 - ANODE | Common return / ground reference | Must be connected to system ground or lowest potential node; defines voltage reference point |
| 3 - REF | Feedback input / reference sense | Monitors external divider; device regulates to force this pin to 1.24 V relative to ANODE |
| 4, 5 - NC | No internal connection | Not bonded; electrically floating; no PCB routing required |
| 6 - Substrate | Internal die attachment | Must be connected to ANODE or left open per datasheet; affects thermal and ESD performance |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V cathode-to-anode voltage - enables use in 1.8 V and 3.3 V systems where TL431 cannot function |
| Ultra-small SC-70 package | 40% smaller footprint than SOT-23-3 - saves board space in compact power supplies and portable electronics |
| Sharp turn-on characteristic | High open-loop gain enables fast comparator response - supports accurate voltage monitoring and fault detection |
| Stable without output capacitor | Internally compensated - eliminates need for external stability capacitor in most shunt regulator configurations |
| Zener diode replacement | 100 nA typical off-state cathode current - reduces standby power loss versus standard Zeners |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
Use Scenario: Precision ADC/DAC reference in battery-powered instrumentation requiring stable 2.5 V or 4.096 V reference derived from 3.3 V rail. IC Role / Device Role / Timing Role: Adjustable shunt reference generating exact output voltage via resistor divider; replaces discrete Zener + op-amp solutions. Use Value: ±0.5% initial tolerance and <12 mV full-temperature drift ensure converter accuracy remains within 12-bit ENOB spec over temperature. | Use Scenario: Isolated feedback path in 3.3 V output flyback converter using optocoupler for primary-side controller communication. IC Role / Device Role / Timing Role: Error amplifier + reference in secondary-side regulation loop; compares output voltage against 1.24 V internal reference. Use Value: Enables regulation down to 2.7 V output (1.24 V + opto LED drop), supporting modern low-voltage rails with <1% load/line regulation. |
| Voltage Monitoring for Power Rails | Comparator with Integrated Reference |
Use Scenario: Undervoltage lockout (UVLO) circuit monitoring 5 V system rail to assert reset if voltage drops below 4.75 V. IC Role / Device Role / Timing Role: Precision shunt reference configured as window comparator threshold element; drives external transistor or logic gate. Use Value: 0.1–0.5 μA reference pin current minimizes divider power loss; 100 μA min cathode current allows direct microcontroller GPIO drive. | Use Scenario: Level-shifting comparator detecting when sensor output exceeds 2.0 V threshold in automotive cabin control module. IC Role / Device Role / Timing Role: Open-loop comparator with built-in 1.24 V reference; REF pin biased externally to set trip point. Use Value: Eliminates external reference IC and reduces BOM count; sharp turn-on provides clean digital transition with <100 ns propagation delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BIDCKR | ±1% initial reference tolerance (vs. ±0.5%); otherwise identical electrical specs and SC-70 package | Suitable where cost sensitivity outweighs need for highest reference accuracy | Select TLVH431BIDCKR for industrial-grade designs where ±1% tolerance meets system error budget |
| TLVH431ACDBVR | SOT-23-5 package (2.90 mm × 1.60 mm); same ±0.5% tolerance and electrical performance | Larger footprint but offers NC and substrate pins for enhanced thermal/EHS design flexibility | Choose TLVH431ACDBVR when layout allows larger package and substrate connection improves thermal management |
Compared with TLVH431BIDCKR and TLVH431ACDBVR, TLVH431ACDCKR delivers the tightest initial reference accuracy in the smallest available footprint, making it optimal for space-constrained, high-precision power monitoring and regulation where board area is premium.
Availability
TLVH431ACDCKR is available at Aetrix Electronics and suitable for isolated flyback SMPS, precision data converter references, and low-voltage rail monitoring requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH431ACDCKR 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, with leadership in power management, signal chain, and high-reliability components.
The TLVH431 family was designed specifically for low-voltage, high-accuracy shunt regulation in isolated power supplies and precision analog systems - extending the TL431 architecture to 1.24 V operation while maintaining robust thermal performance.
FAQ
What is the minimum cathode current required for regulation in TLVH431ACDCKR?
The TLVH431ACDCKR requires a minimum cathode current of 100 μA to maintain regulation across its full operating temperature range. This value is specified in Section 5.5 of the TI SLVS555N datasheet under IK(min). Below this threshold, the device may not sustain stable reference voltage at the REF pin, leading to degraded accuracy or dropout in shunt regulator configurations.
Can TLVH431ACDCKR replace a standard Zener diode in low-leakage applications?
Yes, TLVH431ACDCKR can directly replace low-voltage Zener diodes, offering significantly lower leakage: its off-state cathode current is only 0.02–0.1 μA at 18 V, versus typical Zener leakage of 1–10 μA. Its 1.24 V reference and sharp turn-on also provide superior voltage stability and accuracy compared to Zener devices, especially under varying temperature and current conditions.
What is the purpose of the NC and substrate pins in TLVH431ACDCKR's SC-70 package?
In the TLVH431ACDCKR SC-70 package, pins 4 and 5 are No Connect (NC) with no internal bond; pin 6 is the substrate connection and must be tied to ANODE or left unconnected per TI SLVS555N Pin Functions table. This substrate connection helps manage thermal resistance (RθJC(top) = 87°C/W) and ESD robustness but does not affect core regulation functionality when properly handled.
How does TLVH431ACDCKR achieve stability without an output capacitor?
TLVH431ACDCKR incorporates internal frequency compensation, eliminating the need for an external cathode-to-anode capacitor in most applications. Its transconductance amplifier and bandgap reference are co-designed for unity-gain stability under typical load conditions. Capacitive loads up to ~10 nF can still be used safely, as confirmed by phase margin plots in Figures 5-15 through 5-17 of the datasheet.
Is TLVH431ACDCKR suitable for automotive applications requiring AEC-Q100 qualification?
TLVH431ACDCKR itself is not AEC-Q100 qualified; however, the TLVH431Q variant (e.g., TLVH431QCDCKR) is rated for –40°C to +125°C and intended for automotive use. The "A" grade in TLVH431ACDCKR denotes ±1% reference tolerance - not automotive qualification. For AEC-Q100 compliance, specify the Q-grade part number and verify qualification status in TI's official automotive product documentation.
TLVH431ACDCKR 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:
- ±1%
- 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
TLVH431ACDCKR FAQ
1.How can I place an order for TLVH431ACDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431ACDCKR 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 TLVH431ACDCKR reliable?
The price and inventory of TLVH431ACDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431ACDCKR is usually 5 days.
3.What payment methods are accepted for TLVH431ACDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431ACDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431ACDCKR?
TLVH431ACDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431ACDCKR 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 TLVH431ACDCKR?
For technical support, including TLVH431ACDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431ACDCKR requirements.
6.How does Aetrix verify that TLVH431ACDCKR is sourced from the original manufacturer or authorized distributors?
All TLVH431ACDCKR 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 TLVH431ACDCKR meets industry standards.
7.What is the process for return or replacement of TLVH431ACDCKR?
All TLVH431ACDCKR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431ACDCKR, 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 TLVH431ACDCKR part is unused and in its original packaging.
Return procedure for TLVH431ACDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431ACDCKR Tags
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