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Texas Instruments TLVH431IDBZRG4
- Part No.:
- TLVH431IDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH431IDBZRG4.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,494
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Product details
Overview
TLVH431IDBZRG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, ±0.5% initial tolerance at 25°C (Grade B), 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. It serves as a Zener replacement and error amplifier in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH431IDBZRG4 datasheet, TLVH431IDBZRG4 pinout, TLVH431IDBZRG4 application, or TLVH431IDBZRG4 equivalent, key selection criteria include reference accuracy over –40°C to +125°C, cathode current range (100 μA–70 mA), dynamic impedance stability, thermal drift (±31 mV max over full temperature range), and SOT-23-3 package compatibility with existing TL431 footprints.
Technical Context
The TLVH431IDBZRG4 implements an internally compensated shunt-regulator architecture with a 1.24 V bandgap reference and high-gain NPN-based error amplifier. Its Darlington output stage enables sharp turn-on characteristics and stable regulation without external compensation capacitors.
It operates in two functional modes: open-loop comparator mode (using internal reference for threshold detection) and closed-loop shunt-regulator mode (with resistive feedback from cathode to reference pin). The device requires ≥100 μA cathode current to maintain linear regulation and exhibits <0.5 μA reference terminal current across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V nominal, ±0.5% at 25°C (Grade B), enabling precise low-voltage setpoints |
| Output Voltage Range | Adjustable from 1.24 V to 18 V via external resistor divider - supports wide-range power rail monitoring and regulation |
| Cathode Current Range | 100 μA to 70 mA continuous - allows ultra-low-power biasing and high-current shunt operation |
| Dynamic Impedance | 0.25 Ω typical - ensures minimal output voltage deviation under load transients |
| Temperature Range | –40°C to +125°C (Q-grade) - qualified for automotive and industrial environments |
| Reference Drift | ±31 mV max over full temperature range - translates to <26 ppm/°C average TC for stable long-term accuracy |
| Off-State Cathode Current | 0.02–0.1 μA at VKA = 18 V - enables low-leakage shutdown and battery-backed monitoring |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, surface-mount, gull-wing leads. Thermal resistance RθJA = 206°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input / output node | Primary current path; sinks regulated current when REF voltage exceeds 1.24 V; connects to optocoupler LED anode in isolated SMPS |
| REF (Pin 2) | Reference input / error-sense node | High-impedance input (≤0.5 μA) that compares against internal 1.24 V reference; tied to voltage divider midpoint in regulation circuits |
| ANODE (Pin 3) | Common return / ground reference | Low-impedance common node; must be connected to system ground or power rail return; defines cathode-to-anode voltage (VKA) |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V - enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 (2.5 V) cannot function |
| Ultra-low minimum cathode current | 100 μA max - reduces standby power in always-on monitoring and battery-powered applications |
| Integrated reference + amplifier | No external reference needed - simplifies comparator designs and eliminates matching errors in voltage-monitoring circuits |
| Stable without output capacitor | Internally compensated - avoids instability risks from PCB layout parasitics and capacitor aging in SMPS feedback paths |
| Zener diode replacement | 0.25 Ω dynamic impedance vs. >10 Ω for typical Zeners - improves regulation accuracy and transient response in on-board supplies |
Applications
| Secondary-Side Regulation in Flyback SMPS | Voltage Monitoring for Power Rails |
|---|---|
Use Scenario: Used with optocoupler in isolated 3.3 V flyback converter to regulate output voltage on secondary side. IC Role / Device Role / Timing Role: Shunt regulator and error amplifier - compares sampled output voltage against 1.24 V reference 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), supports compact 3.3 V/5 V adapters, and maintains ±1% output accuracy over line/load/temperature. |
Use Scenario: Monitors 1.8 V, 2.5 V, or 3.3 V supply rails for undervoltage lockout or fault reporting. IC Role / Device Role / Timing Role: Precision comparator with integrated reference - triggers reset or alert when rail drops below threshold defined by resistor divider. Use Value: Eliminates need for external reference IC; achieves <10 mV trip hysteresis with simple RC network; draws <1 μA quiescent current in monitoring state. |
| Adjustable Voltage Reference for Data Converters | Zener Diode Replacement in On-Board Regulation |
Use Scenario: Provides stable, adjustable reference voltage for SAR or delta-sigma ADCs requiring 1.25 V–5 V reference inputs. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source - configured as 2-resistor-adjustable reference with <0.5% initial accuracy and <31 mV total drift. Use Value: Improves ADC ENOB by reducing reference-induced gain error; supports ratiometric measurements with supply-independent scaling. |
Use Scenario: Replaces 2.4 V–12 V Zener diodes in point-of-load regulators, LDO bias networks, or LED current-setting circuits. IC Role / Device Role / Timing Role: Active shunt regulator - sinks excess current to hold voltage constant, with 0.25 Ω dynamic impedance vs. Zener's nonlinear impedance. Use Value: Reduces output voltage variation by >90% under load steps; lowers thermal stress vs. Zener due to higher efficiency and lower power dissipation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt-regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBZR | 1% initial reference tolerance (Grade A), same SOT-23-3 package and electrical specs otherwise | Suitable where ±1% accuracy suffices and cost sensitivity outweighs tight tolerance requirements | Select when B-grade precision is unnecessary and inventory consolidation across A/B grades is preferred |
| TLVH432IDBZR | Identical electrical specs but alternate pinout: REF–CATHODE–ANODE (vs. CATHODE–REF–ANODE in TLVH431IDBZRG4) | Requires PCB layout revision; used where pin 1-to-ground routing simplifies thermal or noise layout | Choose only if board redesign is acceptable and alternate pinout improves grounding or EMI performance |
Compared with TLVH431IDBZRG4, TLVH431ACDBZR trades 0.5% reference accuracy for lower unit cost while retaining identical thermal and dynamic performance; TLVH432IDBZR offers identical functionality but mandates layout changes due to reversed REF/CATHODE pin order - neither is pin-compatible without hardware modification.
Availability
TLVH431IDBZRG4 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and telecom infrastructure equipment requiring stable component supply, long-lifecycle support, and Q-grade temperature qualification.
Supply support for TLVH431IDBZRG4 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 references and power-conversion ICs.
The TLVH431 family was designed specifically for low-voltage, high-accuracy shunt regulation in isolated and non-isolated power supplies - extending TL431 capability to 1.24 V operation while maintaining robustness across automotive and industrial temperature ranges.
FAQ
What is the reference voltage tolerance of TLVH431IDBZRG4 at 25°C?
The TLVH431IDBZRG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to the 'B' grade suffix. This means its VREF is guaranteed between 1.234 V and 1.246 V under nominal conditions, supporting high-accuracy voltage setting in precision applications like data converter references.
Can TLVH431IDBZRG4 replace a standard Zener diode in a 3.3 V regulator circuit?
Yes, TLVH431IDBZRG4 can directly replace Zener diodes in 3.3 V shunt regulators. With 0.25 Ω dynamic impedance and 100 μA minimum cathode current, it provides superior regulation accuracy, lower leakage (<0.1 μA off-state), and sharper knee characteristics compared to discrete Zeners - especially beneficial in low-power and thermally constrained designs.
What is the maximum cathode-to-anode voltage rating for TLVH431IDBZRG4?
The absolute maximum cathode-to-anode voltage (VKA) for TLVH431IDBZRG4 is 20 V. Its recommended operating range extends from VREF (1.24 V) up to 18 V, making it suitable for regulating outputs from 1.24 V to 18 V using external resistors - ideal for multi-rail systems and programmable supplies.
Does TLVH431IDBZRG4 require an external compensation capacitor?
No, TLVH431IDBZRG4 is internally compensated and remains stable without an external output capacitor between cathode and anode. This eliminates capacitor-related reliability risks and layout sensitivity. However, if a capacitor is added for noise filtering, Figures 5-15–5-17 in the datasheet guide selection to avoid phase-margin degradation.
How does TLVH431IDBZRG4 differ from TL431 in practical design?
TLVH431IDBZRG4 differs from TL431 by supporting 1.24 V reference (vs. 2.5 V), 100 μA minimum cathode current (vs. 1 mA), and operation down to 1.24 V cathode-anode voltage. These features enable use in 1.8 V–3.3 V systems where TL431 cannot start up or regulate - expanding applicability to modern low-voltage power architectures.
TLVH431IDBZRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TLVH431IDBZRG4 FAQ
1.How can I place an order for TLVH431IDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431IDBZRG4 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 TLVH431IDBZRG4 reliable?
The price and inventory of TLVH431IDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431IDBZRG4 is usually 5 days.
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TLVH431IDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431IDBZRG4 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 TLVH431IDBZRG4?
For technical support, including TLVH431IDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431IDBZRG4 requirements.
6.How does Aetrix verify that TLVH431IDBZRG4 is sourced from the original manufacturer or authorized distributors?
All TLVH431IDBZRG4 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 TLVH431IDBZRG4 meets industry standards.
7.What is the process for return or replacement of TLVH431IDBZRG4?
All TLVH431IDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431IDBZRG4, 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 TLVH431IDBZRG4 part is unused and in its original packaging.
Return procedure for TLVH431IDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431IDBZRG4 Tags
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TL431AIDBZR
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