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Texas Instruments TL1431VTDB1
- Part No.:
- TL1431VTDB1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- Die
- Datasheet:
-
TL1431VTDB1.pdf
- Description:
- IC VREF SHUNT ADJ 0.4% DIE
- Quantity:
- Payment:
- Shipping:
Inventory:2,852
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Product details
Overview
TL1431VTDB1 from Texas Instruments is a radiation-tolerant, space-grade bare-die precision programmable shunt voltage reference with 0.2-Ω typical output impedance, ±0.5% initial voltage tolerance, and 500 ns fast turnon-designed for onboard regulation and switching power supply feedback in high-reliability aerospace systems.
For engineers reviewing the TL1431VTDB1 datasheet, TL1431VTDB1 pinout, TL1431VTDB1 application, or TL1431VTDB1 equivalent, key selection factors include rad-hard qualification (100 kRad RHA), low reference current, adjustable output voltage (2.5 V to 36 V), sink current capability, and die-level handling requirements for hybrid microcircuit assembly.
Technical Context
The TL1431VTDB1 implements a precision two-terminal shunt regulator architecture with an internal bandgap reference and error amplifier driving an NPN pass transistor. Its active output circuitry enables sharp turnon and stable regulation under dynamic load conditions without external compensation.
It operates as a 3-terminal programmable reference (CATHODE, ANODE, REF) in a bare-die configuration with floating backside potential, TiW/AlCu2% metallization, and 10.5-mil thickness-intended for die-bonding into hermetic or ceramic hybrid packages per MIL-STD-883 screening.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Impedance | 0.2 Ω typical - ensures minimal output voltage shift under varying sink current loads |
| Initial Voltage Tolerance | ±0.5% at 25°C - enables precise feedback loop setting without post-trim calibration |
| Turnon Time | 500 ns - supports high-frequency switching supply transient response and fast fault recovery |
| Radiation Tolerance | 100 kRad RHA - qualified for long-duration missions in Earth orbit and deep space environments |
| Adjustable Range | 2.5 V to 36 V - set via external resistor divider on REF pin for system-specific regulation targets |
| Reference Current | Low - reduces power loss in high-impedance feedback networks and improves efficiency |
| Operating Temp | 25°C only (DC parametric tested) - AC performance and temperature range not warranted per TI production baseline |
Pinout & Package
Bare die in waffle pack; no encapsulation. Die thickness: 10.5 mils; backside finish: silicon with backgrind; metallization: TiW/AlCu2% (1626.9 nm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pad 1) | Regulated output node | Sinks current to maintain programmed voltage at REF; connects to primary feedback point in SMPS |
| ANODE (Pad 2) | Return path / ground reference | Provides current return path; must be tied to system ground or common reference plane |
| REF (Pad 3) | Voltage sense input | High-impedance input for external resistor divider; sets output voltage via VOUT = VREF(1 + R1/R2) |
Key Features
| Feature | Design Value |
|---|---|
| QMLV-qualified radiation hardness | 100 kRad RHA - eliminates need for shielding or derating in LEO/GEO satellite power systems |
| Sharp turnon characteristic | 500 ns rise time - enables stable regulation during rapid load transients in pulsed-power converters |
| Low-output-impedance regulation | 0.2 Ω typical - minimizes interaction with PCB trace inductance and improves loop stability |
| Programmable output voltage | 2.5 V–36 V via external resistors - replaces multiple fixed-voltage Zener diodes with single die solution |
| Space production baseline processing | MIL-STD-883 compliant screening - ensures consistency across flight hardware lots and traceability per NASA-STD-8739 |
Applications
| Onboard DC-DC Regulation | Spacecraft Switching PSU Feedback |
|---|---|
Use Scenario: Regulating secondary bus voltages in satellite payload power distribution units where size, weight, and radiation resilience are critical. IC Role / Device Role / Timing Role: Shunt reference providing precision feedback to PWM controller error amplifier. Use Value: Enables compact, rad-hard regulation without discrete Zener arrays or trimming components. | Use Scenario: Closed-loop voltage control in radiation-hardened buck/boost converters powering avionics subsystems. IC Role / Device Role / Timing Role: Adjustable shunt reference setting output voltage via resistor divider on REF pin. Use Value: Maintains ±0.5% accuracy over life without recalibration, reducing test overhead and mission risk. |
| Redundant Power Monitor | High-Reliability Analog Signal Conditioning |
Use Scenario: Monitoring backup power rail integrity in fault-tolerant spacecraft power management ICs. IC Role / Device Role / Timing Role: Precision voltage threshold detector using REF input and comparator interface. Use Value: Delivers consistent trip point across temperature and radiation exposure due to low drift and hardened design. | Use Scenario: Setting bias points and gain references in radiation-tolerant sensor front-ends for planetary rovers. IC Role / Device Role / Timing Role: Stable 2.5 V reference source for ADC reference buffers and op-amp offset nulling. Use Value: Eliminates thermal drift-induced measurement errors in long-duration science data acquisition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL1431-SP | Ceramic packaged version; same die, full QMLV space qualification, includes hermetic seal and leadframe | Used where die bonding is impractical; requires standard SMD placement and reflow | Select TL1431-SP when hybrid assembly infrastructure is unavailable or when full package-level reliability testing is mandated |
| TL1431-EP | Enhanced Product variant; qualified for defense/aerospace but not rad-hard (no RHA rating); wider temp range (–55°C to 125°C) | Applicable in ground-based radar, missile guidance, and airborne systems without space radiation exposure | Choose TL1431-EP for cost-sensitive high-reliability programs where radiation tolerance is not required |
Compared with TL1431-SP and TL1431-EP, the TL1431VTDB1 provides the smallest form factor and direct integration into custom hybrid substrates-but requires die attach expertise and wafer-level handling controls.
Availability
TL1431VTDB1 is available at Aetrix Electronics and suitable for spacecraft power regulation, radiation-hardened DC-DC converter design, and hybrid microcircuit assembly requiring stable component supply across extended procurement cycles.
Supply support for TL1431VTDB1 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 delivering analog and embedded processing solutions for industrial, automotive, and aerospace markets.
The TL1431-DIE product line delivers radiation-tolerant, bare-die programmable references optimized for space-qualified hybrid power management circuits and high-reliability military electronics.
FAQ
What is the radiation tolerance specification for TL1431VTDB1?
The TL1431VTDB1 is QMLV-qualified to 100 kRad RHA (Radiation Hardness Assurance), making it suitable for use in low-Earth orbit and geosynchronous satellite power systems. This rating is verified per MIL-STD-883 Method 1019 and applies to the bare-die configuration shipped in waffle pack. No derating is required up to this total ionizing dose.
Does TL1431VTDB1 require external compensation for stability?
No, the TL1431VTDB1 does not require external compensation. Its internal architecture provides inherent stability across its full 2.5 V–36 V adjustment range when used with standard resistor-divider feedback networks. The 0.2 Ω typical output impedance and fast 500 ns turnon ensure robust transient response without added capacitors or phase compensation.
How is the output voltage programmed on TL1431VTDB1?
The output voltage of TL1431VTDB1 is programmed using an external resistor divider connected between CATHODE and ANODE, with the REF terminal tapping the midpoint. The formula is VOUT = 2.5 V × (1 + R1/R2), where R1 connects to CATHODE and R2 connects to ANODE. The REF pin draws minimal current, enabling high-impedance dividers that reduce power loss.
What are the handling requirements for TL1431VTDB1 bare die?
TL1431VTDB1 is ESD-sensitive and must be handled per ANSI/ESD S20.20 guidelines. Use grounded tweezers, ionized air, and static-dissipative work surfaces. Avoid contact with bond pads; inspect under 75× magnification per MIL-STD-883 Method 2010 Condition B. Backside is electrically floating-do not short or bias it during die attach.
Is TL1431VTDB1 tested over temperature?
No. Per TI's production baseline, TL1431VTDB1 undergoes DC parametric and functional testing only at 25°C. AC performance, temperature cycling, and operation outside 25°C are not warranted. System-level thermal validation must be performed by the end user, especially in spacecraft thermal vacuum environments.
TL1431VTDB1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- Die
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±0.4%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 1 mA
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
TL1431VTDB1 FAQ
1.How can I place an order for TL1431VTDB1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL1431VTDB1 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 TL1431VTDB1 reliable?
The price and inventory of TL1431VTDB1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL1431VTDB1 is usually 5 days.
3.What payment methods are accepted for TL1431VTDB1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL1431VTDB1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL1431VTDB1?
TL1431VTDB1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL1431VTDB1 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 TL1431VTDB1?
For technical support, including TL1431VTDB1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL1431VTDB1 requirements.
6.How does Aetrix verify that TL1431VTDB1 is sourced from the original manufacturer or authorized distributors?
All TL1431VTDB1 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 TL1431VTDB1 meets industry standards.
7.What is the process for return or replacement of TL1431VTDB1?
All TL1431VTDB1 units undergo pre-shipment inspection (PSI). If there is an issue with TL1431VTDB1, 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 TL1431VTDB1 part is unused and in its original packaging.
Return procedure for TL1431VTDB1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL1431VTDB1 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
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