My Inquiry
My Account
Texas Instruments TLVH431IDBZR
- Part No.:
- TLVH431IDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH431IDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,199
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TLVH431IDBZR 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 voltages from 1.24 V to 18 V via external resistors-enabling secondary-side regulation in isolated 3.3 V flyback SMPSs.
For engineers reviewing the TLVH431IDBZR datasheet, TLVH431IDBZR pinout, TLVH431IDBZR application, or TLVH431IDBZR equivalent, key selection criteria include its ultra-low minimum cathode current, tight reference tolerance, wide –40°C to +125°C operating range, SOT-23-3 package footprint, and compatibility with optocoupler-based feedback loops in space-constrained power supplies.
Technical Context
The TLVH431IDBZR integrates a 1.24 V bandgap reference and high-gain transconductance amplifier driving a Darlington sink output stage. Its open-loop comparator mode enables precise voltage monitoring without external references, while closed-loop configuration-with resistive feedback from cathode to reference-forms a stable shunt regulator with sharp turn-on characteristics.
Unlike the TL431, it operates from as low as 1.24 V cathode-to-anode voltage and draws only 100 μA minimum cathode current for regulation. The device is internally compensated and remains stable without an output capacitor, though capacitive load stability margins are characterized up to 100 nF across 1.25 V–5 V cathode voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V nominal, ±0.5% at 25°C (B-grade)-ensures accurate setpoint for adjustable regulators and comparators |
| Min Cathode Current | 100 μA-enables regulation in ultra-low-power applications where TL431 would fail |
| Output Voltage Range | 1.24 V to 18 V-set by two external resistors, supporting wide-range supply and reference design |
| Dynamic Impedance | 0.25 Ω typical-provides low-output-impedance behavior comparable to precision Zener diodes |
| Operating Temp Range | –40°C to +125°C-qualified for automotive and industrial environments without derating |
| Reference Input Current | 0.1–0.5 μA-minimizes resistor-divider loading error in high-impedance feedback networks |
| Cathode Voltage Max | 20 V absolute max-supports use in 15 V rail monitoring and 12 V SMPS designs |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, 0.95 mm height, gull-wing leads, RoHS-compliant, tape-and-reel packaging.
| 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 SMPS output or optocoupler LED anode |
| ANODE (Pin 3) | Common return / ground reference | Typically tied to system ground or power rail return; defines cathode-to-anode voltage (VKA) and sets regulation headroom |
| REF (Pin 2) | Feedback input / reference threshold | Compares external voltage to internal 1.24 V reference; requires ≥0.1 μA bias current; connects to resistor divider midpoint in regulator mode |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates from 1.24 V cathode-to-anode-enables direct use in 1.8 V, 2.5 V, and 3.3 V systems without level-shifting |
| Ultra-low IK(min) | 100 μA minimum cathode current-reduces standby power loss and extends battery life in always-on monitoring circuits |
| High DC accuracy | ±0.5% VREF tolerance at 25°C (B-grade)-eliminates need for post-production trimming in precision references |
| Stable without COUT | No mandatory output capacitor-simplifies layout, reduces BOM count, and avoids capacitor aging or ESR-related drift |
| Wide temperature support | Specified from –40°C to +125°C-meets AEC-Q100 Grade 1 requirements for under-hood automotive applications |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPSs |
|---|---|
Use Scenario: Provides stable, low-drift reference for 12–16-bit SAR and delta-sigma ADCs in portable instrumentation. IC Role / Device Role / Timing Role: Precision shunt reference supplying VREF input to ADC; replaces discrete Zener + op-amp combos. Use Value: 0.25 Ω dynamic impedance and <0.5 μA reference current minimize code-dependent errors and improve effective resolution by >½ LSB. | Use Scenario: Error amplifier and voltage reference in isolated 3.3 V/1 A flyback converter using optocoupler feedback. IC Role / Device Role / Timing Role: Closed-loop shunt regulator sensing output voltage and modulating optocoupler LED current to control primary-side controller. Use Value: 100 μA IK(min) allows regulation at light loads; ±0.5% VREF ensures ±1% output voltage accuracy over line, load, and temperature. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
Use Scenario: Replaces 1.2–1.5 V Zener diodes in on-board LDO supervision and bias generation circuits. IC Role / Device Role / Timing Role: Low-leakage, low-impedance shunt element providing stable clamping or bias point. Use Value: IK(off) ≤ 0.1 μA at 18 V and 125°C-reduces quiescent current by >10× vs. standard Zeners, critical for battery-backed systems. | Use Scenario: Monitors 1.8 V, 2.5 V, or 3.3 V microcontroller core rails for brown-out detection and reset assertion. IC Role / Device Role / Timing Role: Open-loop comparator comparing rail voltage to internal 1.24 V reference via resistor divider. Use Value: Sharp turn-on characteristic and <1 μs response enable reliable reset timing; no external reference IC required. |
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 VREF tolerance (A-grade) vs. 0.5% (B-grade); otherwise identical electrical specs and pinout | Suitable where ±1% output accuracy suffices-e.g., non-critical biasing or coarse voltage monitoring | Select TLVH431ACDBZR for cost-sensitive designs accepting wider reference tolerance |
| TLV431ACDBVR | Higher 1.24 V reference but only rated to 6 V cathode voltage; 1% tolerance; SC70-5 package (5-pin, different pinout) | Limited to low-voltage (<6 V) applications; not drop-in for 12–18 V SMPS feedback | Choose TLV431ACDBVR only for sub-6 V rails where smaller SC70 footprint is prioritized over voltage range |
Compared with TLVH431ACDBZR, TLVH431IDBZR offers tighter reference accuracy for precision regulation; compared with TLV431ACDBVR, it supports higher cathode voltages and uses the industry-standard 3-pin SOT-23 layout-making TLVH431IDBZR the optimal choice for automotive and industrial isolated power supplies requiring both accuracy and robustness.
Availability
TLVH431IDBZR is available at Aetrix Electronics and suitable for isolated flyback SMPSs, precision data converter references, and low-power voltage monitoring circuits requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH431IDBZR 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 for industrial, automotive, and consumer applications.
The TLVH431 product line was designed specifically for low-voltage, high-accuracy shunt regulation in space-constrained and thermally demanding environments-targeting secondary-side feedback in compact switching power supplies and precision analog signal chains.
FAQ
What is the reference voltage tolerance of TLVH431IDBZR at 25°C?
The TLVH431IDBZR has a reference voltage tolerance of ±0.5% at 25°C, corresponding to the 'B' grade designation in its part number. This means its VREF falls between 1.234 V and 1.246 V under nominal conditions, enabling high-accuracy voltage setting in feedback networks and reference circuits without calibration.
Can TLVH431IDBZR operate with cathode-to-anode voltage below 2.5 V?
Yes, TLVH431IDBZR is specifically designed for low-voltage operation and regulates stably with cathode-to-anode voltage as low as 1.24 V. This capability distinguishes it from the TL431 and makes TLVH431IDBZR ideal for 1.8 V, 2.5 V, and 3.3 V system rails where traditional shunt references cannot function.
What is the minimum cathode current required for regulation in TLVH431IDBZR?
The TLVH431IDBZR requires a minimum cathode current of 100 μA to maintain regulation, as specified in its electrical characteristics table. This ultra-low IK(min) enables efficient light-load performance in battery-powered devices and standby circuits where power conservation is critical.
Does TLVH431IDBZR require an output capacitor for stability?
No, TLVH431IDBZR is internally compensated and remains stable without an output capacitor between cathode and anode. However, if an output capacitor is used for filtering or transient response, stability margins are documented in Figures 5-15 through 5-17 of the datasheet for capacitive loads up to 100 nF.
How does TLVH431IDBZR differ from TLVH432IDBZR in pin configuration?
TLVH431IDBZR uses a SOT-23-3 package with pinout: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. TLVH432IDBZR has reversed pinout: Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. They are electrically identical but not pin-compatible-PCB layout must match the specific variant.
TLVH431IDBZR 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:
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TLVH431IDBZR FAQ
1.How can I place an order for TLVH431IDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431IDBZR 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 TLVH431IDBZR reliable?
The price and inventory of TLVH431IDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431IDBZR is usually 5 days.
3.What payment methods are accepted for TLVH431IDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431IDBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431IDBZR?
TLVH431IDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431IDBZR 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 TLVH431IDBZR?
For technical support, including TLVH431IDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431IDBZR requirements.
6.How does Aetrix verify that TLVH431IDBZR is sourced from the original manufacturer or authorized distributors?
All TLVH431IDBZR 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 TLVH431IDBZR meets industry standards.
7.What is the process for return or replacement of TLVH431IDBZR?
All TLVH431IDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431IDBZR, 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 TLVH431IDBZR part is unused and in its original packaging.
Return procedure for TLVH431IDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431IDBZR Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
