TL1431MJGB Texas Instruments Integrated Circuit (Ceramic Dual-In-Line Packages) In Stock
The TL1431MJGB is a precision programmable shunt voltage reference with a 2.495 V typical internal reference and up to 100 mA output sink current. It provides a stable output from 2.475 V to 36 V using two external resistors in a ceramic 8-pin DIP package. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Ceramic Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- TL1431MJGB Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Programmable output voltage from 2.475 V to 36 V with just 2 external resistors for flexible power supply design
- 100 mA maximum output sink current with tight 2.475 V to 2.54 V reference band for precise voltage regulation
- Military-grade ceramic 8-pin DIP package ensures long-term reliability in harsh-environment power supply applications
Applications
The TL1431MJGB is widely used as the feedback element in isolated flyback and forward converter power supplies, where it sets the output voltage set-point with two resistors and drives an optocoupler to close the control loop. Its accurate 2.495 V internal reference ensures the regulated output tracks tight line and load regulation requirements down to millivolt-level error. It also serves as a precision undervoltage lockout threshold comparator and as a low-cost shunt regulator in battery charger reference circuits.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Analog IC - Other Type | TWO TERMINAL VOLTAGE REFERENCE |
| JESD-30 Code | R-GDIP-T8 |
| JESD-609 Code | e0 |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Output Current-Max | 0.1A |
| Output Voltage-Max | 2.54V |
| Output Voltage-Min | 2.475V |
| Output Voltage-Nom | 2.5V |
| Package Body Material | CERAMIC, GLASS-SEALED |
| Package Equivalence Code | DIP8,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Screening Level | 38535Q/M;38534H;883B |
| Supply Voltage-Max (Vsup) | 36V |
| Supply Voltage-Min (Vsup) | 2.5V |
| Supply Voltage-Nom (Vsup) | 2.5V |
| Surface Mount | NO |
| Technology | BIPOLAR |
| Temp Coef of Voltage-Max | 114ppm/°C |
| Temperature Grade | MILITARY |
| Terminal Finish | Tin/Lead (Sn/Pb) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Trim/Adjustable Output | YES |
| Package | Ceramic Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for TL1431MJGB:
Two Terminal Voltage Reference, 1 Output, 2.5V, Trim/Adjustable, BIPolar, CDIP8
Frequently Asked Questions
What output voltage range can TL1431MJGB regulate and what sets the programmed voltage?
The TL1431MJGB can regulate any output voltage from 2.475 V up to 36 V. Two external resistors connected to the reference pin form a voltage divider from the output to ground, and when the divided voltage matches the 2.495 V internal reference, the shunt regulates. Changing the resistor ratio shifts the regulated voltage across the full 2.475 V to 36 V range without any other components.
How is TL1431MJGB used to close the feedback loop in an isolated flyback power supply?
In a flyback converter, the TL1431MJGB monitors the output voltage and drives the cathode of an optocoupler LED whose anode connects to the supply. When the output rises above the set point defined by the 2-resistor divider, the TL1431MJGB sinks more current through the LED, increasing the optocoupler's photocurrent and reducing the PWM controller duty cycle, thereby pulling the output back to regulation within a few millivolts of the 2.495 V reference target.
What distinguishes the TL1431MJGB from the standard plastic TL431 in terms of reliability and procurement?
The TL1431MJGB uses a ceramic 8-pin DIP package suitable for military and aerospace temperature ranges of -55°C to +125°C, compared to the plastic SOIC or SOT-23 commercial variants rated to 85°C. Ceramic packaging provides better hermeticity and longer lifetime in high-humidity or high-vibration environments. This makes the MJGB suffix variant the choice for defense electronics and space-qualified power supply designs where COTS plastic parts would fail qualification.
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