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Texas Instruments TLVH431ACDCKRE4
- Part No.:
- TLVH431ACDCKRE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
TLVH431ACDCKRE4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SC70-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,803
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Product details
Overview
TLVH431ACDCKRE4 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SC-70-6 package, featuring 1.24 V reference voltage (±1% at 25°C), 100 μA to 70 mA cathode current range, 0.25 Ω typical dynamic impedance, and operation from –40°C to +125°C. It serves as an ultra-low-voltage Zener replacement and error amplifier in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH431ACDCKRE4 datasheet, TLVH431ACDCKRE4 pinout, TLVH431ACDCKRE4 application, or TLVH431ACDCKRE4 equivalent, key selection criteria include reference accuracy grade (A = 1%), SC-70 footprint constraints, cathode current headroom for regulation stability, and thermal performance in compact power rails.
Technical Context
The TLVH431ACDCKRE4 implements a precision bandgap reference with high-gain NPN-based error amplifier and Darlington sink output stage. Its internal architecture enables sharp turn-on behavior and stable closed-loop regulation without external compensation capacitors.
It operates in two distinct functional modes: open-loop comparator mode (with integrated 1.24 V reference) and closed-loop shunt regulator mode (using resistive feedback between cathode and reference pins). Minimum cathode current of 100 μA ensures linear region operation across –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1% at 25°C - sets precise regulation threshold for feedback networks |
| Cathode Current Range | 100 μA to 70 mA - supports low-power monitoring and higher-current shunt regulation |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage stability under load transients |
| Operating Temperature | –40°C to +125°C - qualified for automotive and industrial ambient environments |
| Output Voltage Range | 1.24 V to 18 V - adjustable via two external resistors, enabling wide-range rail sensing |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error in precision applications |
| Off-State Cathode Current | 0.02–0.1 μA - enables ultra-low leakage shutdown behavior in power-rail monitors |
Pinout & Package
TLVH431ACDCKRE4 uses the SC-70-6 (DCK) package (2.00 mm × 1.25 mm), with pin 2 internally connected to substrate and requiring connection to ANODE or left open per datasheet guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current/voltage input | Sink path for regulated current; connects to feedback node or optocoupler LED anode |
| ANODE (Pin 2) | Common ground reference | Substrate-connected terminal; must be tied to system ground or left open per layout rules |
| REF (Pin 3) | Threshold input | Compares external voltage to internal 1.24 V reference; requires ≥0.1 μA bias current |
| NC (Pin 4) | No internal connection | Unused pad; no electrical function; may be left floating or grounded for thermal relief |
| NC (Pin 5) | No internal connection | Unused pad; no electrical function; not bonded in die assembly |
| NC (Pin 6) | No internal connection | Unused pad; no electrical function; serves mechanical support only |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates down to 1.24 V - enables compatibility with 1.8 V, 2.5 V, and 3.3 V systems |
| Ultra-small SC-70 footprint | 40% smaller than SOT-23-3 - saves board space in dense power management layouts |
| Integrated reference + amplifier | Single-device comparator functionality - eliminates external reference IC in voltage monitor designs |
| Stable without output capacitor | Internally compensated - reduces BOM count and avoids capacitor-induced instability in flyback feedback |
| Wide cathode current range | 100 μA minimum - supports energy-efficient operation in battery-backed or always-on monitoring circuits |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary Side Regulation in Flyback SMPSs |
|---|---|
Use Scenario: Precision ADC/DAC reference in portable instrumentation where supply headroom is limited to ≤3.3 V. IC Role / Device Role / Timing Role: Adjustable shunt reference providing stable 1.24–5.0 V reference voltage with <1% initial tolerance. Use Value: Eliminates need for dedicated low-dropout reference IC while maintaining 0.25 Ω dynamic impedance for noise immunity. |
Use Scenario: Isolated feedback path in 3.3 V/5 V AC-DC adapters using optocoupler-coupled TLVH431ACDCKRE4 on secondary side. IC Role / Device Role / Timing Role: Error amplifier + reference in closed-loop regulation, setting output voltage via R1/R2 divider. Use Value: Enables regulation as low as 2.7 V output with 1.4 V optocoupler forward drop, leveraging 1.24 V reference and 100 μA min IK. |
| Zener Replacement with Low Leakage | Voltage Monitoring for Power Rails |
Use Scenario: On-board 1.8 V rail clamp in FPGA I/O banks where traditional Zeners exhibit excessive leakage above 85°C. IC Role / Device Role / Timing Role: Precision shunt regulator replacing 1.8 V Zener diode with active feedback control. Use Value: Reduces off-state cathode current to 0.1 μA max (vs >10 μA for Zeners), improving standby efficiency in always-on domains. |
Use Scenario: Undervoltage lockout (UVLO) detection for 5 V microcontroller supply in automotive body control modules. IC Role / Device Role / Timing Role: Open-loop comparator comparing rail voltage to internal 1.24 V reference via resistor divider. Use Value: Provides accurate 4.5 V trip point with ±1% tolerance over –40°C to +125°C, eliminating external reference and comparator. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BIDCKR | 0.5% reference tolerance (B grade) vs 1% (A grade); same SC-70-6 package and temperature range | Higher precision required in metrology-grade data converters or calibration circuits | Select when tighter initial accuracy outweighs cost sensitivity; identical pinout and layout |
| TLVH432ACDCKR | Different pinout: REF/ANODE/CATHODE sequence (vs CATHODE/ANODE/REF in TLVH431); otherwise identical electrical specs | Used where PCB layout reuses TLVH432-compatible footprints or requires alternate routing topology | Choose only if schematic and layout accommodate reversed pin assignment; not drop-in compatible |
Compared with TLVH431BIDCKR, TLVH431ACDCKRE4 trades 0.5% accuracy for lower unit cost while retaining full thermal and current capability; compared with TLVH432ACDCKR, it requires different PCB routing due to non-interchangeable pin mapping despite identical SC-70-6 mechanical dimensions.
Availability
TLVH431ACDCKRE4 is available at Aetrix Electronics and suitable for isolated flyback SMPSs, precision voltage monitors, low-leakage Zener replacements, and ADC reference circuits requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH431ACDCKRE4 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 precision analog, power management, and signal chain technologies.
The TLVH431 family was designed for low-voltage, high-accuracy shunt regulation in space-constrained power systems-targeting isolated DC-DC converters, voltage supervisors, and reference-sourced comparators.
FAQ
What is the reference voltage tolerance of TLVH431ACDCKRE4 at 25°C?
The TLVH431ACDCKRE4 has a reference voltage tolerance of ±1% at 25°C, corresponding to a 1.24 V nominal value ranging from 1.228 V to 1.252 V. This A-grade specification is confirmed in Section 5.6 of the TI SLVS555N datasheet and applies across all temperature variants (C/I/Q) of the TLVH431A series. The tolerance remains stable over the full operating temperature range due to internal trimming.
Can TLVH431ACDCKRE4 operate without an output capacitor?
Yes, TLVH431ACDCKRE4 is internally compensated and stable without an output capacitor between cathode and anode. This eliminates mandatory external capacitance in most shunt regulator configurations. However, if a capacitor is added for noise filtering or transient response shaping, Figures 5-15 through 5-17 in the datasheet provide phase-margin guidance for selecting values up to 10 nF depending on cathode voltage and load conditions.
What is the minimum cathode current required for regulation in TLVH431ACDCKRE4?
The minimum cathode current required for regulation in TLVH431ACDCKRE4 is 100 μA at 25°C, with a maximum of 150 μA over the full –40°C to +125°C temperature range. Below this threshold, open-loop gain drops significantly, impairing regulation accuracy and response time. This value is specified in Sections 5.5–5.7 and validated in Figure 5-5 of the SLVS555N datasheet.
How does TLVH431ACDCKRE4 differ from TLVH432ACDCKR in pin configuration?
TLVH431ACDCKRE4 uses pin order CATHODE–ANODE–REF–NC–NC–NC in its SC-70-6 package, whereas TLVH432ACDCKR uses REF–CATHODE–ANODE–NC–NC–NC. This reversal means they are not pin-compatible: direct substitution would invert feedback polarity and disable regulation. Layout and schematic must be modified to match the respective pin maps defined in Figures 4-2 and 4-5 of the datasheet.
Is TLVH431ACDCKRE4 suitable for automotive applications?
Yes, TLVH431ACDCKRE4 is qualified for automotive use when ordered in the Q-grade variant (e.g., TLVH431AQDCKR), which is specified from –40°C to +125°C and meets AEC-Q100 stress test requirements. The "E4" suffix in TLVH431ACDCKRE4 indicates tape-and-reel packaging compliant with JEDEC J-STD-033 moisture sensitivity level 1, supporting standard SMT assembly in automotive manufacturing lines.
TLVH431ACDCKRE4 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:
- ±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
TLVH431ACDCKRE4 FAQ
1.How can I place an order for TLVH431ACDCKRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431ACDCKRE4 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 TLVH431ACDCKRE4 reliable?
The price and inventory of TLVH431ACDCKRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431ACDCKRE4 is usually 5 days.
3.What payment methods are accepted for TLVH431ACDCKRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431ACDCKRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431ACDCKRE4?
TLVH431ACDCKRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431ACDCKRE4 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 TLVH431ACDCKRE4?
For technical support, including TLVH431ACDCKRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431ACDCKRE4 requirements.
6.How does Aetrix verify that TLVH431ACDCKRE4 is sourced from the original manufacturer or authorized distributors?
All TLVH431ACDCKRE4 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 TLVH431ACDCKRE4 meets industry standards.
7.What is the process for return or replacement of TLVH431ACDCKRE4?
All TLVH431ACDCKRE4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431ACDCKRE4, 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 TLVH431ACDCKRE4 part is unused and in its original packaging.
Return procedure for TLVH431ACDCKRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431ACDCKRE4 Tags
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