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Texas Instruments TLVH431ACDBZR
- Part No.:
- TLVH431ACDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH431ACDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:12,945
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Product details
Overview
TLVH431ACDBZR from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, ±0.5% initial tolerance at 25°C (A-grade), and operation down to 1.24 V cathode-anode voltage. It delivers stable regulation across –40°C to +125°C, supports 100 μA to 70 mA cathode current, and features 0.25 Ω typical dynamic impedance-enabling use as a Zener replacement or error amplifier in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH431ACDBZR datasheet, TLVH431ACDBZR pinout, TLVH431ACDBZR application, or TLVH431ACDBZR equivalent, key selection considerations include its SOT-23-3 (DBZ) package, 3-pin terminal configuration (CATHODE/REF/ANODE), 1.24 V reference accuracy, ultra-low minimum cathode current (100 μA), and compatibility with optocoupler-based secondary-side regulation in 3.3 V switching-mode power supplies.
Technical Context
The TLVH431ACDBZR implements an internal bandgap reference and high-gain NPN-based error amplifier driving a Darlington sink output stage. Its open-loop comparator mode enables precise voltage monitoring without external references, while closed-loop operation-using resistive feedback between CATHODE and REF-configures it as an adjustable shunt regulator with output voltage set from 1.24 V to 18 V.
It operates with no external compensation required due to internal frequency compensation, maintains stability with capacitive loads up to 10 nF (per Figure 5-15–5-17), and exhibits sharp turn-on characteristics enabled by active output circuitry-making it suitable for low-leakage, low-headroom applications where traditional Zeners fail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±0.5% at 25°C - sets precise regulation threshold; enables 1.24 V–18 V adjustable output via two external resistors |
| Initial Tolerance Grade | A-grade (±1%) - tighter than standard grade (±1.5%), looser than B-grade (±0.5%); balances cost and precision for industrial designs |
| Cathode Current Range | 100 μA to 70 mA - supports ultra-low-power biasing (e.g., battery-backed monitors) and robust shunt regulation in SMPS |
| Dynamic Impedance | 0.25 Ω typical - ensures minimal output voltage deviation under load transients; critical for stable feedback in isolated converters |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments requiring extended thermal range |
| Output Voltage Range | 1.24 V to 18 V - achieved with external resistor divider; enables direct replacement of discrete Zener + op-amp circuits |
| Reference Input Current | 0.1–0.5 μA - ultra-low IREF minimizes divider network error and power loss in high-impedance feedback paths |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, 3-pin surface-mount outline with gull-wing leads. Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input / regulated output node | Accepts sinking current from external supply; voltage at this pin is controlled relative to ANODE via feedback on REF |
| REF (Pin 2) | Reference input / feedback sense node | Compares against internal 1.24 V bandgap; must be biased with ≥0.1 μA; connects to resistor divider midpoint in regulator configurations |
| ANODE (Pin 3) | Common return / ground reference | Typically connected to system ground or low-side return path; serves as voltage reference point for both VKA and VREF |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Operates with as little as 1.24 V cathode-to-anode headroom-enables regulation in 1.8 V, 2.5 V, and 3.3 V systems where TL431 fails |
| Ultra-low minimum cathode current | 100 μA maximum IK(min) - allows stable regulation in micropower applications (e.g., energy harvesting, always-on monitors) |
| Integrated reference + amplifier | Single-device replacement for Zener diode + op-amp comparator - reduces BOM count, PCB area, and layout complexity |
| Stable without output capacitor | Internally compensated for unity-gain stability - eliminates need for external capacitor in most feedback configurations |
| Sharp turn-on characteristic | Active output stage delivers fast, clean switching behavior - improves response time in overvoltage protection and voltage monitor circuits |
Applications
| Isolated Flyback SMPS Feedback | Low-Voltage Zener Replacement |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in 3.3 V isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Adjustable shunt regulator and error amplifier-compares sampled output voltage against internal 1.24 V reference and drives optocoupler LED current. Use Value: Enables regulation down to ~2.7 V output (1.24 V + opto VF), outperforming TL431 in low-voltage SMPS designs. |
Use Scenario: Precision voltage clamping or threshold detection in battery-powered sensor nodes. IC Role / Device Role / Timing Role: Low-leakage shunt reference-replaces discrete Zener diodes with superior temperature stability and lower IOFF (0.02–0.1 μA). Use Value: Reduces standby current by >90% vs. 5.1 V Zener + resistor bias; maintains ±1% accuracy across –40°C to +125°C. |
| Voltage Monitoring for Power Rails | Comparator with Integrated Reference |
|
Use Scenario: Real-time monitoring of 1.8 V or 2.5 V FPGA core rails for brownout detection. IC Role / Device Role / Timing Role: Open-loop comparator-REF pin senses rail voltage; CATHODE sinks current when threshold exceeded. Use Value: Eliminates need for external reference IC; achieves <10 μs response with 0.1 μA reference bias current. |
Use Scenario: Level-shifting and logic-level comparison in mixed-signal interface circuits. IC Role / Device Role / Timing Role: Self-referenced comparator-uses internal 1.24 V reference to compare analog inputs against fixed threshold. Use Value: Simplifies design vs. op-amp + external reference; supports rail-to-rail input with guaranteed 100 μA minimum sink capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt-regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BIDBZR | 0.5% initial VREF tolerance (B-grade) vs. 1% (A-grade); identical pinout, package, and electrical specs otherwise | Better accuracy needed for high-precision ADC references or metrology-grade power supplies | Select when ±0.5% reference stability at 25°C is mandatory; same layout and thermal profile |
| TLV431ACDBVR | Lower max cathode voltage (6 V vs. 18 V); same 1.24 V reference and SOT-23-5 package; higher IREF (1.5 μA typ) | Restricted to sub-6 V systems; not suitable for 12 V or 15 V SMPS feedback | Choose only for ultra-low-voltage (<6 V), space-constrained designs where 18 V headroom is unnecessary |
Compared with TLVH431ACDBZR, TLVH431BIDBZR offers tighter reference accuracy without layout or thermal impact, while TLV431ACDBVR trades voltage range and reference current for smaller footprint-making TLVH431ACDBZR optimal for general-purpose 1.24–18 V shunt regulation with industrial temperature support.
Availability
TLVH431ACDBZR is available at Aetrix Electronics and suitable for isolated SMPS feedback, low-voltage Zener replacement, and precision voltage monitoring applications requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH431ACDBZR 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 emphasis on reliability, performance, and broad technical support.
The TLVH431 family was designed specifically for low-voltage, high-accuracy shunt regulation in isolated power supplies and precision monitoring-addressing limitations of legacy TL431 in modern 1.8–3.3 V systems.
FAQ
What is the reference voltage tolerance of TLVH431ACDBZR at 25°C?
The TLVH431ACDBZR has a reference voltage tolerance of ±1% at 25°C, corresponding to its "A" grade designation. This means VREF is guaranteed between 1.228 V and 1.252 V under nominal conditions, as specified in Section 5.6 of the TI SLVS555N datasheet.
Can TLVH431ACDBZR operate with less than 1.24 V cathode-to-anode voltage?
No-TLVH431ACDBZR requires a minimum cathode-to-anode voltage (VKA) of 1.24 V to maintain regulation. Below this, the internal reference and amplifier cannot bias correctly. The device may conduct weakly but will not regulate, per Absolute Maximum Ratings and Recommended Operating Conditions in the datasheet.
What is the minimum cathode current required for regulation in TLVH431ACDBZR?
The TLVH431ACDBZR requires a minimum cathode current (IK(min)) of 100 μA to enter and sustain regulation, as confirmed in Sections 5.5–5.7 and Figure 5-5 of the datasheet. Operation below this level results in degraded gain and unstable reference tracking.
Does TLVH431ACDBZR require an external output capacitor for stability?
No-TLVH431ACDBZR is internally compensated and stable without an external capacitor between CATHODE and ANODE. However, if a capacitor is used (e.g., for noise filtering), Figures 5-15–5-17 provide phase-margin guidance up to 10 nF depending on VKA.
How does TLVH431ACDBZR differ from TLVH432ACDBZR in pinout and function?
TLVH431ACDBZR uses SOT-23-3 pinout: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. TLVH432ACDBZR swaps REF and ANODE: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE. Functionally identical, but PCB layout must match the specific pin assignment-no direct drop-in replacement without board revision.
TLVH431ACDBZR 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%
- 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
TLVH431ACDBZR FAQ
1.How can I place an order for TLVH431ACDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431ACDBZR 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 TLVH431ACDBZR reliable?
The price and inventory of TLVH431ACDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431ACDBZR is usually 5 days.
3.What payment methods are accepted for TLVH431ACDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431ACDBZR transactions.
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4.How is shipping managed for TLVH431ACDBZR?
TLVH431ACDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431ACDBZR 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 TLVH431ACDBZR?
For technical support, including TLVH431ACDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431ACDBZR requirements.
6.How does Aetrix verify that TLVH431ACDBZR is sourced from the original manufacturer or authorized distributors?
All TLVH431ACDBZR 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 TLVH431ACDBZR meets industry standards.
7.What is the process for return or replacement of TLVH431ACDBZR?
All TLVH431ACDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431ACDBZR, 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 TLVH431ACDBZR part is unused and in its original packaging.
Return procedure for TLVH431ACDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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