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Texas Instruments TLVH431ACDBZRG4
- Part No.:
- TLVH431ACDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH431ACDBZRG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,445
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Product details
Overview
TLVH431ACDBZRG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1% initial reference voltage tolerance at 25°C, 1.24 V nominal reference voltage, 0.25 Ω typical dynamic impedance, and operation from –40°C to +125°C. It functions as a programmable Zener replacement or error amplifier in isolated flyback SMPS feedback loops requiring tight regulation below 3.3 V.
For engineers reviewing the TLVH431ACDBZRG4 datasheet, TLVH431ACDBZRG4 pinout, TLVH431ACDBZRG4 application, or TLVH431ACDBZRG4 equivalent, key selection criteria include cathode current range (100 μA to 70 mA), reference voltage deviation over temperature (±31 mV for Q-grade), output voltage adjustability (1.24 V to 18 V), and SOT-23-3 package compatibility with space-constrained power rails.
Technical Context
The TLVH431ACDBZRG4 implements a three-terminal shunt-regulator architecture with an internal 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 operation with resistive feedback achieves stable adjustable regulation.
Unlike the TL431, it operates down to 1.24 V cathode-anode voltage and draws only 100 μA minimum cathode current for regulation-enabling use in ultra-low-power systems. The device is internally compensated and stable without an output capacitor, though phase margin vs. capacitive load is characterized up to 100 nF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±1% at 25°C - sets minimum programmable output voltage and defines accuracy baseline for resistor-divider-based regulation |
| Output Voltage Range | 1.24 V to 18 V - achieved via two external resistors; supports regulation of 3.3 V, 5 V, and higher rails without external reference |
| Cathode Current Range | 100 μA to 70 mA - enables operation in low-power monitoring (e.g., battery supervision) and higher-current shunt regulation (e.g., SMPS feedback) |
| Dynamic Impedance | 0.25 Ω typical - ensures minimal output voltage variation under load transients; critical for stable optocoupler-driven isolated feedback |
| Temperature Range | –40°C to +125°C - qualified for automotive and industrial environments; reference deviation ≤ ±31 mV across full range (Q-grade) |
| Reference Input Current | 0.1–0.5 μA - ultra-low bias current minimizes divider resistor loading error and enables high-impedance sensing networks |
| Output Voltage Drift vs. Cathode Voltage | –1.5 to –2.7 mV/V - quantifies line regulation sensitivity; enables accurate prediction of output shift under input rail variation |
Pinout & Package
SOT-23-3 package (DBZ): 2.92 mm × 1.30 mm body, 0.95 mm max height, gull-wing leads, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input / output node | Primary current path; sinks regulated current to ANODE; connects to optocoupler LED anode or feedback network output |
| REF (Pin 2) | Reference input / threshold sense node | High-impedance input comparing external voltage to internal 1.24 V reference; requires ≥0.1 μA bias for proper NPN base drive |
| ANODE (Pin 3) | Common return / ground reference | Low-impedance common terminal; must be connected to system ground or power rail return; serves as voltage reference point for all internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Operates with cathode-anode voltage as low as 1.24 V - enables regulation in 1.8 V, 2.5 V, and 3.3 V systems where TL431 cannot function |
| Ultra-low reference input current | 0.1–0.5 μA - reduces power loss and voltage error in high-resistance feedback dividers, extending battery life in portable devices |
| Sharp turn-on characteristic | High open-loop gain (>60 dB) and fast response - provides clean switching behavior when used as a comparator or voltage monitor |
| Internal compensation | Stable without external output capacitor - simplifies layout and eliminates capacitor-related instability risks in isolated feedback designs |
| Wide cathode current range | 100 μA to 70 mA - supports both microamp-level rail monitoring and milliamp-level shunt regulation in single-device footprint |
Applications
| Secondary-Side Regulation in Isolated Flyback SMPS | Zener Diode Replacement in Low-Leakage Circuits |
|---|---|
|
Use Scenario: Regulating 3.3 V output in AC/DC adapter with optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Shunt regulator and error amplifier - compares sampled output voltage to internal 1.24 V reference and adjusts optocoupler LED current to control primary-side controller. Use Value: Enables stable regulation at 3.3 V with <2.7 V minimum achievable output (1.24 V + opto VF), outperforming TL431 in low-voltage isolated supplies. |
Use Scenario: Providing precision 2.5 V reference for ADC biasing in battery-powered sensor node. IC Role / Device Role / Timing Role: Adjustable shunt reference - replaces discrete Zener + resistor network with lower leakage (<0.1 μA off-state) and tighter tolerance. Use Value: Reduces quiescent current by >90% versus 5.1 V Zener + series resistor, extending shelf life and runtime in always-on monitoring applications. |
| Voltage Monitoring for Power Rails | Comparator with Integrated Reference |
|
Use Scenario: Detecting undervoltage condition on 1.8 V I/O rail in FPGA power management system. IC Role / Device Role / Timing Role: Precision voltage monitor - REF pin biased to 1.8 V via resistor divider; CATHODE pulled high until threshold crossed. Use Value: Eliminates need for external reference IC; ±1% tolerance and –40°C to +125°C operation ensure reliable fault detection across environmental extremes. |
Use Scenario: Implementing window comparator for Li-ion cell voltage supervision (2.8 V–4.2 V). IC Role / Device Role / Timing Role: Single-supply comparator - uses internal 1.24 V reference to compare divided cell voltage; outputs logic-level signal to MCU interrupt pin. Use Value: Integrates reference and comparator in one 3-pin SOT-23, reducing BOM count and PCB area versus op-amp + external reference solution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BCDBZRG4 | 0.5% initial VREF tolerance (vs. 1%); otherwise identical electrical specs and pinout | Required where tighter reference accuracy is needed for high-resolution ADC references or precision power sequencing | Select when ±0.5% VREF stability at 25°C is mandatory; same thermal drift and operating range |
| TLVH432ACDBZRG4 | Different pinout: REF=Pin1, CATHODE=Pin2, ANODE=Pin3 (vs. CATHODE=Pin1, REF=Pin2, ANODE=Pin3) | Used when board layout requires alternate routing of REF and CATHODE signals; not drop-in compatible without PCB revision | Choose only if schematic/layout accommodates reversed REF/CATHODE assignment; identical performance otherwise |
Compared with TLVH431ACDBZRG4, TLVH431BCDBZRG4 delivers higher initial accuracy without trade-offs in temperature drift or supply range, while TLVH432ACDBZRG4 offers functional equivalence at the cost of non-interchangeable pin mapping-requiring layout verification before substitution.
Availability
TLVH431ACDBZRG4 is available at Aetrix Electronics and suitable for isolated flyback SMPS design, precision voltage monitoring, and low-leakage reference applications requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH431ACDBZRG4 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 and embedded processing technologies, with leadership in power management, signal chain, and high-reliability components.
The TLVH431 family was designed for precision shunt regulation in low-voltage, low-power systems-including isolated DC/DC converters, battery monitors, and sensor interface circuits-where traditional TL431 devices cannot operate.
FAQ
What is the reference voltage tolerance of TLVH431ACDBZRG4 at 25°C?
The TLVH431ACDBZRG4 has a reference voltage tolerance of ±1% at 25°C, corresponding to a 1.24 V nominal value with a range of 1.228 V to 1.252 V. This A-grade specification is confirmed in Section 5.6 of the TI datasheet SLVS555N and applies specifically to the TLVH431AC variant in DBZ packaging. The tolerance remains stable across the full operating temperature range for industrial and automotive grades.
Can TLVH431ACDBZRG4 replace a standard Zener diode in low-current applications?
Yes, TLVH431ACDBZRG4 can directly replace low-voltage Zener diodes (e.g., 2.4 V, 3.3 V) with significant advantages: it draws only 0.1–0.5 μA reference current versus typical Zener leakage, offers ±1% initial accuracy versus ±5% for most Zeners, and provides sharp turn-on characteristics. Its 100 μA minimum cathode current requirement is easily met in bias networks, making TLVH431ACDBZRG4 ideal for precision, low-leakage reference generation.
What is the maximum cathode voltage rating for TLVH431ACDBZRG4?
The absolute maximum cathode-to-anode voltage (VKA) for TLVH431ACDBZRG4 is 20 V, as specified in Section 5.1 of the TI datasheet. However, the recommended operating range is VREF to 18 V (1.24 V–18 V), which defines the usable output voltage span when configured as an adjustable shunt regulator. Exceeding 18 V in continuous operation risks exceeding power dissipation limits and degrading long-term reliability.
Does TLVH431ACDBZRG4 require an output capacitor for stability?
No, TLVH431ACDBZRG4 is internally compensated and stable without an output capacitor between CATHODE and ANODE. This is explicitly stated in Section 7.3 of the datasheet. However, if a capacitor is added for noise filtering or transient suppression, Figures 5-15 through 5-17 provide phase-margin vs. capacitive-load data to guide selection-up to 100 nF is supported depending on cathode voltage and load conditions.
How does the pinout of TLVH431ACDBZRG4 differ from TLVH432ACDBZRG4?
TLVH431ACDBZRG4 uses Pin 1=CATHODE, Pin 2=REF, Pin 3=ANODE. TLVH432ACDBZRG4 reverses Pins 1 and 2: Pin 1=REF, Pin 2=CATHODE, Pin 3=ANODE. This difference is documented in Figures 4-4 and 4-5 of the datasheet and makes them non-pin-compatible. Substituting TLVH432ACDBZRG4 for TLVH431ACDBZRG4 without PCB modification will result in incorrect biasing and functional failure.
TLVH431ACDBZRG4 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:
- 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:
- SOT-23-3
TLVH431ACDBZRG4 FAQ
1.How can I place an order for TLVH431ACDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431ACDBZRG4 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 TLVH431ACDBZRG4 reliable?
The price and inventory of TLVH431ACDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431ACDBZRG4 is usually 5 days.
3.What payment methods are accepted for TLVH431ACDBZRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431ACDBZRG4 transactions.
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4.How is shipping managed for TLVH431ACDBZRG4?
TLVH431ACDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431ACDBZRG4 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 TLVH431ACDBZRG4?
For technical support, including TLVH431ACDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431ACDBZRG4 requirements.
6.How does Aetrix verify that TLVH431ACDBZRG4 is sourced from the original manufacturer or authorized distributors?
All TLVH431ACDBZRG4 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 TLVH431ACDBZRG4 meets industry standards.
7.What is the process for return or replacement of TLVH431ACDBZRG4?
All TLVH431ACDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431ACDBZRG4, 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 TLVH431ACDBZRG4 part is unused and in its original packaging.
Return procedure for TLVH431ACDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431ACDBZRG4 Tags
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