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Texas Instruments TLVH431ACLPR
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- Part No.:
- TLVH431ACLPR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
TLVH431ACLPR.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
TLVH431ACLPR from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, ±0.5% initial tolerance at 25°C (B-grade), and operation down to 100 µA cathode current. It delivers 0.25 Ω typical dynamic impedance and supports output voltage adjustment from 1.24 V to 18 V using two external resistors - ideal for secondary-side regulation in isolated 3.3 V flyback SMPSs.
For engineers reviewing the TLVH431ACLPR datasheet, TLVH431ACLPR pinout, TLVH431ACLPR application, or TLVH431ACLPR equivalent, key selection criteria include its ultra-low minimum cathode current, tight reference tolerance, wide –40°C to +125°C operating range, SC-70 package footprint, and compatibility with optocoupler-based feedback loops in safety-critical power supplies.
Technical Context
The TLVH431ACLPR 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 without external compensation capacitors across cathode–anode.
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 from cathode to reference pin). Both modes require ≥100 µA cathode current to maintain linear operation and specified gain.
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 in ultra-low-power systems where TL431 fails |
| Output Voltage Range | 1.24 V to 18 V - adjustable via two external resistors, supporting wide supply rails |
| Dynamic Impedance | 0.25 Ω typical - ensures minimal output voltage deviation under load transients |
| Operating Temp Range | –40°C to +125°C - qualified for automotive and industrial environments |
| Max Cathode Voltage | 20 V absolute max - defines safe headroom for 18 V regulated output designs |
| Ref Input Current | 0.1–0.5 µA - imposes negligible loading on feedback divider, preserving accuracy |
Pinout & Package
TLVH431ACLPR uses the SC-70 (DCK) 6-pin package (2.00 mm × 1.25 mm), featuring cathode, anode, and reference terminals plus two no-connect (NC) pins and one substrate connection (pin 2) that must be tied to anode or left open.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input / output node | Sinks current to regulate voltage; connects to feedback network output or optocoupler LED anode |
| ANODE (Pin 6) | Common return path | Typically grounded; serves as reference point for cathode voltage and reference terminal |
| REF (Pin 3) | Feedback input / reference sense | Compares external voltage to internal 1.24 V; requires ≥0.1 µA bias current |
| NC (Pins 4, 5) | No internal connection | Must remain unconnected; no electrical function or thermal benefit |
| Substrate (Pin 2) | Mechanical die attachment | Internally connected to die substrate; must be tied to ANODE or left floating - not used as signal |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulating at 1.24 V - enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 cannot function |
| Ultra-low Ik(min) | 100 µA - reduces standby power in always-on monitoring circuits and battery-backed systems |
| Integrated reference + amplifier | Single-device comparator functionality - eliminates need for external reference and op-amp in voltage monitor designs |
| Stable without output capacitor | No mandatory cathode–anode capacitor - simplifies layout and improves reliability in space-constrained PCBs |
| SC-70 package | 40% smaller footprint than SOT-23-3 - saves board area in portable and dense power modules |
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 tightly across line/load/temperature. IC Role / Device Role / Timing Role: Acts as error amplifier and precision voltage reference - compares sampled output to 1.24 V and adjusts optocoupler LED current to control primary-side controller. Use Value: Enables regulation down to 2.7 V output (1.24 V + opto VF) and maintains ±1% total output accuracy over –40°C to +125°C. | Use Scenario: Replaces discrete 2.5 V Zener diodes in on-board voltage clamping and rail monitoring circuits. IC Role / Device Role / Timing Role: Functions as programmable shunt regulator - sinks current when cathode voltage exceeds setpoint defined by R1/R2 divider. Use Value: Reduces leakage current by >90% vs. Zener diodes (0.02–0.1 µA off-state vs. >10 µA), improving system efficiency and stability. |
| Voltage Monitoring for Power Rails | Adjustable Reference for Data Converters |
Use Scenario: Monitors 1.8 V, 2.5 V, or 3.3 V supply rails in microcontroller or FPGA systems to trigger reset or alert signals. IC Role / Device Role / Timing Role: Operates in open-loop comparator mode - reference pin tied to monitored rail; cathode pulled high to generate digital flag when overvoltage occurs. Use Value: Provides factory-trimmed 0.5% reference accuracy and sharp turn-on (no hysteresis needed), eliminating calibration in production test. | Use Scenario: Supplies precise, adjustable reference voltage to SAR or delta-sigma ADCs in sensor signal chains and industrial DAQ systems. IC Role / Device Role / Timing Role: Delivers low-noise, low-drift reference (12 ppm/°C typical) with <0.25 Ω output impedance to minimize code errors during conversion. Use Value: Maintains ENOB >14 bits over temperature by limiting reference-induced gain error to <0.05% full-scale. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACLP | Same SC-70 package and 1% initial tolerance (A-grade); higher VREF deviation (±12 mV) over temperature | Acceptable where ±1% room-temp accuracy suffices and cost sensitivity outweighs long-term stability needs | Select when B-grade precision is unnecessary and unit cost reduction is prioritized |
| TLVH432ACLPR | Different pinout (REF–CATHODE–ANODE vs. CATHODE–ANODE–REF); identical electrical specs and SC-70 package | Requires PCB layout revision due to reversed REF/CATHODE placement; same performance in feedback or comparator roles | Choose only if existing design uses TLVH432 pinout or layout reuse mandates matching pin sequence |
Compared with TLVH431ACLP, TLVH431ACLPR offers tighter initial tolerance and lower temperature drift - critical for high-accuracy references. Compared with TLVH432ACLPR, it shares all electrical characteristics but demands different PCB routing due to pin order, making TLVH431ACLPR optimal for new designs prioritizing precision and layout simplicity.
Availability
TLVH431ACLPR is available at Aetrix Electronics and suitable for isolated flyback SMPSs, precision voltage monitors, low-power rail supervisors, and ADC reference circuits requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH431ACLPR 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 delivering analog, embedded processing, and connectivity solutions with deep expertise in power management and precision analog ICs.
The TLVH431 family was designed specifically for low-voltage, low-power shunt regulation and integrated reference applications - targeting isolated power supplies, voltage supervision, and data converter reference subsystems in harsh thermal environments.
FAQ
What is the reference voltage tolerance of TLVH431ACLPR at 25°C?
The TLVH431ACLPR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal value ranging from 1.234 V to 1.246 V. This B-grade specification is confirmed in Section 5.7 of the official TI datasheet SLVS555N and applies strictly to the TLVH431ACLPR variant with SC-70 packaging and C/I/Q temperature grading.
Can TLVH431ACLPR operate with cathode current below 100 µA?
No - TLVH431ACLPR requires a minimum cathode current of 100 µA to maintain regulation and specified gain. Below this threshold, the device exits linear operation, causing reference voltage inaccuracy and degraded dynamic impedance. The datasheet specifies IK(min) = 100 µA under all operating conditions, and attempting sub-threshold operation risks unstable feedback in SMPS or comparator applications.
How does TLVH431ACLPR differ from TLVH432ACLPR?
TLVH431ACLPR and TLVH432ACLPR share identical electrical specifications, SC-70 packaging, and temperature ratings, but differ exclusively in pinout: TLVH431ACLPR uses CATHODE–ANODE–REF (pins 1–6–3), while TLVH432ACLPR uses REF–CATHODE–ANODE. This difference mandates PCB layout changes - they are not pin-compatible replacements despite identical function and performance.
Is an output capacitor required for stability with TLVH431ACLPR?
No, TLVH431ACLPR is internally compensated and remains stable without an output capacitor between cathode and anode. 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 versus capacitive load and cathode voltage - values above 10 nF may degrade stability depending on operating point.
What is the maximum cathode-to-anode voltage for TLVH431ACLPR?
The absolute maximum cathode-to-anode voltage (VKA) for TLVH431ACLPR is 20 V, as specified in Section 5.1 of the TI datasheet. Continuous operation above this rating risks permanent damage. For reliable 18 V output regulation, design margin must ensure VKA never exceeds 20 V under worst-case transients, including overshoot and ripple.
TLVH431ACLPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Cut Tape (CT)
- 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:
- Through Hole
- Supplier Device Package:
- TO-92-3
TLVH431ACLPR FAQ
1.How can I place an order for TLVH431ACLPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431ACLPR 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 TLVH431ACLPR reliable?
The price and inventory of TLVH431ACLPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431ACLPR is usually 5 days.
3.What payment methods are accepted for TLVH431ACLPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431ACLPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431ACLPR?
TLVH431ACLPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431ACLPR 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 TLVH431ACLPR?
For technical support, including TLVH431ACLPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431ACLPR requirements.
6.How does Aetrix verify that TLVH431ACLPR is sourced from the original manufacturer or authorized distributors?
All TLVH431ACLPR 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 TLVH431ACLPR meets industry standards.
7.What is the process for return or replacement of TLVH431ACLPR?
All TLVH431ACLPR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431ACLPR, 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 TLVH431ACLPR part is unused and in its original packaging.
Return procedure for TLVH431ACLPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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