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Texas Instruments TLVH431CLPR
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- Part No.:
- TLVH431CLPR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
TLVH431CLPR.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,058
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Product details
Overview
TLVH431CLPR from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, ±0.5% initial tolerance (B-grade), and operation down to 100 µA cathode current. It functions as a programmable Zener replacement or integrated-reference comparator in isolated feedback paths of 3.3 V flyback SMPSs.
For engineers reviewing the TLVH431CLPR datasheet, TLVH431CLPR pinout, TLVH431CLPR application, or TLVH431CLPR equivalent, key selection criteria include its 1.24 V minimum output setting, 0.25 Ω dynamic impedance, –40°C to +125°C extended temperature range, and SC-70 package compatibility for space-constrained power monitoring and regulation designs.
Technical Context
The TLVH431CLPR implements a precision bandgap reference and high-gain NPN-based error amplifier in a 3-terminal shunt topology. Its internal Darlington output stage enables sharp turn-on behavior and stable regulation with no external compensation required.
It operates in two distinct functional modes: open-loop comparator mode (using internal 1.24 V reference for voltage monitoring) and closed-loop shunt regulator mode (with resistive feedback from cathode to reference pin to set output between 1.24 V and 18 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C - sets minimum programmable output and defines accuracy baseline for feedback networks |
| Cathode Current Range | 100 µA to 70 mA - supports ultra-low-power biasing and robust regulation under load transients |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output regulation against cathode current variations in feedback loops |
| Temperature Range | –40°C to +125°C - qualified for automotive and industrial environments without derating |
| Output Voltage Range | 1.24 V to 18 V - adjustable via two external resistors, enabling flexible rail monitoring and regulation |
| Reference Input Current | 0.1–0.5 µA - minimizes resistor-divider loading error and enables high-impedance feedback design |
| Line Regulation | –1.5 to –2.7 mV/V - quantifies reference voltage drift vs. cathode voltage, critical for wide-input-range supplies |
Pinout & Package
TLVH431CLPR is packaged in SC-70 (DCK), a 6-pin surface-mount package measuring 2.00 mm × 1.25 mm with 0.65 mm pitch. Pin 1 is CATHODE, Pin 2 is connected to substrate (must tie to ANODE or leave open), Pin 3 is REF, Pin 4 and Pin 5 are NC (no internal connection), and Pin 6 is ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input/output node | Primary current path for regulation; sinks current when REF voltage exceeds 1.24 V |
| REF (Pin 3) | Reference input sensing node | Compares external voltage to internal 1.24 V reference; requires ≥0.1 µA bias current |
| ANODE (Pin 6) | Common return terminal | Typically grounded; serves as reference point for cathode and REF voltages |
| NC (Pins 4, 5) | No internal connection | Unused; must remain unconnected per datasheet |
| Substrate (Pin 2) | Die attachment pad | Must be connected to ANODE or left floating-never driven independently |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulating at 1.24 V cathode-to-anode voltage-enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 cannot function |
| B-grade precision | ±0.5% reference tolerance at 25°C-reduces calibration overhead in high-accuracy ADC references and power monitors |
| Ultra-low IK(min) | 100 µA minimum cathode current-supports energy-efficient standby regulation and battery-backed supervision |
| Stable without output capacitor | Internally compensated-eliminates need for external stability capacitor in most shunt regulator configurations |
| Integrated comparator functionality | Operates open-loop with built-in 1.24 V threshold-replaces discrete op-amp + reference combos in voltage detection circuits |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary Side Regulation in Flyback SMPSs |
|---|---|
Use Scenario: Providing precise, low-drift reference voltage for 12–16-bit SAR and delta-sigma ADCs in industrial sensor front-ends. IC Role / Device Role / Timing Role: Shunt regulator configured in closed-loop mode with resistive divider to generate stable 2.048 V or 4.096 V reference. Use Value: 0.25 Ω dynamic impedance and ±0.5% initial tolerance ensure <0.01% full-scale error contribution to ADC transfer function. |
Use Scenario: Isolated voltage feedback in 3.3 V/5 W flyback converters using optocoupler-coupled secondary-side control. IC Role / Device Role / Timing Role: Error amplifier + reference in closed-loop configuration, comparing sampled output to internal 1.24 V and driving optocoupler LED. Use Value: 100 µA minimum cathode current allows reliable operation even at light loads, improving no-load efficiency and transient response. |
| Zener Replacement with Low Leakage | Voltage Monitoring for Power Rails |
Use Scenario: Replacing 2.5 V or 3.3 V Zener diodes in on-board LDO pre-regulation or bias networks. IC Role / Device Role / Timing Role: Programmable shunt element operating in closed-loop mode with fixed R1/R2 to emulate low-leakage Zener behavior. Use Value: 0.02–0.1 µA off-state cathode current at 18 V reduces quiescent loss by >90% versus standard 500 µA Zeners. |
Use Scenario: Monitoring 1.8 V, 3.3 V, or 5 V system rails for brownout detection or supervisor triggering in microcontroller-based systems. IC Role / Device Role / Timing Role: Open-loop comparator comparing rail voltage to internal 1.24 V reference via resistive divider. Use Value: Sharp turn-on characteristic and guaranteed operation down to –40°C enable reliable reset assertion across full industrial temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AILPR | 1% initial reference tolerance (A-grade), otherwise identical electrical specs and SC-70 package | Suitable where ±1% accuracy suffices and cost optimization is prioritized over B-grade precision | Select TLVH431AILPR when system-level calibration compensates for reference error or when tighter thermal drift is not required |
| TLVH432CLPR | Same B-grade tolerance and specs, but SOT-23-3 pinout (REF–CATHODE–ANODE) instead of SC-70's 6-pin layout | Used where board layout rework permits 3-pin footprint change and smaller body size is not mandatory | Choose TLVH432CLPR only if existing SOT-23-3 land pattern is available and substrate pin handling is simplified |
Compared with TLVH431AILPR, TLVH431CLPR delivers higher initial accuracy at marginally higher cost; compared with TLVH432CLPR, it offers 40% smaller footprint and different pin assignment-neither is pin-compatible, requiring PCB redesign for substitution.
Availability
TLVH431CLPR is available at Aetrix Electronics and suitable for industrial power monitoring, isolated SMPS feedback, and precision data converter reference applications requiring stable component supply across extended temperature ranges.
Supply support for TLVH431CLPR 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 specializing in analog, embedded processing, and power management ICs, with leadership in precision reference and power control technologies.
The TLVH431 family was designed specifically for low-voltage, high-accuracy shunt regulation and integrated-reference comparison in space- and power-constrained systems such as isolated DC/DC converters and sensor signal chains.
FAQ
What is the minimum cathode current required for regulation in TLVH431CLPR?
The TLVH431CLPR requires a minimum cathode current of 100 µA to maintain regulation across its full temperature range. This value is specified in the Electrical Characteristics table under IK(min) and is critical for ensuring stable operation in low-power or light-load conditions. Below this threshold, the device may exit regulation, causing reference voltage inaccuracy or open-loop behavior. TLVH431CLPR achieves this ultra-low minimum current through optimized Darlington output stage design.
How does TLVH431CLPR differ from the standard TL431 in practical design?
TLVH431CLPR differs from TL431 primarily in three ways: it operates down to 1.24 V (vs. TL431's 2.5 V), draws only 100 µA minimum cathode current (vs. TL431's 1 mA), and features tighter initial tolerance options (0.5% B-grade). These differences enable TLVH431CLPR to regulate lower output voltages, reduce standby power, and improve accuracy in modern low-voltage systems where TL431 cannot function reliably.
Can TLVH431CLPR be used without an external output capacitor?
Yes, TLVH431CLPR is internally compensated and stable without an external output capacitor between cathode and anode in most standard shunt regulator configurations. This eliminates capacitor-related BOM cost and layout complexity. 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 safe values based on capacitive load and cathode voltage.
What is the role of Pin 2 (substrate) in the TLVH431CLPR SC-70 package?
In the TLVH431CLPR SC-70 (DCK) package, Pin 2 is the substrate connection and must be tied to the ANODE terminal or left electrically floating-never driven independently or grounded separately. This requirement ensures proper thermal and electrical biasing of the die. Failure to follow this instruction may cause parameter shift or instability, as confirmed in the Pin Functions table and Figure 4-2 of the official TI datasheet SLVS555N.
Is TLVH431CLPR suitable for automotive applications?
Yes, TLVH431CLPR is qualified for automotive use when ordered as the Q-grade variant (TLVH431Q), which is rated for –40°C to +125°C operation and meets AEC-Q100 stress test requirements. The CLPR suffix indicates the SC-70 package and B-grade tolerance, but automotive qualification depends on the full part number including the temperature grade suffix-always verify ordering code against TI's official automotive-grade documentation before deployment.
TLVH431CLPR 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:
- ±1.5%
- 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:
- Through Hole
- Supplier Device Package:
- TO-92-3
TLVH431CLPR FAQ
1.How can I place an order for TLVH431CLPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431CLPR 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 TLVH431CLPR reliable?
The price and inventory of TLVH431CLPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431CLPR is usually 5 days.
3.What payment methods are accepted for TLVH431CLPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431CLPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431CLPR?
TLVH431CLPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431CLPR 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 TLVH431CLPR?
For technical support, including TLVH431CLPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431CLPR requirements.
6.How does Aetrix verify that TLVH431CLPR is sourced from the original manufacturer or authorized distributors?
All TLVH431CLPR 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 TLVH431CLPR meets industry standards.
7.What is the process for return or replacement of TLVH431CLPR?
All TLVH431CLPR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431CLPR, 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 TLVH431CLPR part is unused and in its original packaging.
Return procedure for TLVH431CLPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431CLPR Tags
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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