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Texas Instruments 8418002XA
- Part No.:
- 8418002XA
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-206AB, TO-46-3 Metal Can
- Datasheet:
-
8418002XA.pdf
- Description:
- IC VREF SHUNT 5V TO46-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,926
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Product details
Overview
8418002XA from Texas Instruments is a precision 5.0V shunt voltage reference diode in a hermetically sealed TO-metal-can package, featuring 0.6Ω dynamic impedance, ±12 mV reverse breakdown change over 0.6–15 mA operating current, and guaranteed temperature stability of ≤36 mV across −55°C to +125°C. It serves as a low-drift, trimmable reference for aerospace-grade power supplies and high-reliability instrumentation.
For engineers reviewing the 8418002XA datasheet, 8418002XA pinout, 8418002XA application, or 8418002XA equivalent, this QML-qualified device supports critical design tasks including precision ADC/DAC biasing, crowbar circuit threshold setting, and bipolar reference generation under extended temperature and radiation-tolerant conditions.
Technical Context
The 8418002XA implements a monolithic shunt regulator architecture with a three-terminal configuration (Anode, Cathode, Adjust), enabling independent trimming of both output voltage (4.0–6.0 V range) and temperature coefficient via external resistive networks. Its 0.6Ω dynamic impedance ensures minimal load regulation error across its 600 μA–10 mA operating current range.
Designed to MIL-PRF-38535 Class Q/V requirements, it undergoes full Group A testing per MIL-STD-883 across −55°C, +25°C, and +125°C, with guaranteed VR = 4.83–5.13 V (LM136-5.0QML grade) and ZRD ≤ 1.6 Ω at 1 mA, supporting stable operation in avionics and spaceborne systems where long-term drift and thermal hysteresis are tightly constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 4.83–5.13 V at 1 mA; enables precise 5.0V system calibration with <±2% initial tolerance. |
| Dynamic Impedance | ≤1.6 Ω; maintains <0.1% output variation under 1 mA load transients. |
| Operating Current Range | 600 μA to 10 mA; supports ultra-low-power sensor biasing and high-current reference buffering. |
| Temp Stability | ≤36 mV over −55°C to +125°C; eliminates need for external compensation in wide-temperature military designs. |
| Temp Coefficient Trim | Adjustable via third terminal; allows minimization of TC to <10 ppm/°C using diode-compensated networks. |
| Package | TO-46 metal can (NDV0003H); provides hermetic sealing, EMI shielding, and 46°C/W junction-to-case thermal resistance. |
Pinout & Package
8418002XA uses a 3-lead TO-metal-can package (NDV0003H, JEDEC TO-46 compliant), with leads arranged in bottom-view order: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = Adjust. The metal case is electrically connected to Pin 2 (Cathode).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Current sink input | Connects to ground or negative rail when used as positive reference; enables bidirectional polarity configuration. |
| Pin 2 (Cathode) | Reference output / case connection | Delivers regulated 5.0V; metal case tied to this pin provides EMI shielding and thermal path to heatsink. |
| Pin 3 (Adjust) | Trim control node | Accepts external resistor network to adjust VR (4–6 V) and minimize temperature coefficient independently. |
Key Features
| Feature | Design Value |
|---|---|
| Three-terminal trim architecture | Enables simultaneous optimization of output voltage accuracy and temperature coefficient without iterative rework. |
| Hermetic TO-46 metal package | Guarantees long-term parameter stability in high-humidity, vacuum, and radiation environments per MIL-PRF-38535. |
| Low 0.6Ω dynamic impedance | Reduces output error to <600 μV under 1 mA load step, critical for high-resolution data acquisition front-ends. |
| −55°C to +125°C operation | Validated across full military temperature range with no derating required up to 10 mA at +125°C. |
Applications
| Aerospace Power Monitoring | Precision Instrumentation Calibration |
|---|---|
Use Scenario: Real-time monitoring of 28V aircraft bus voltage with ±0.1% accuracy over flight envelope. IC Role / Device Role / Timing Role: Shunt reference providing stable 5.0V基准 for 16-bit SAR ADC input scaling and fault-detection comparators. Use Value: Enables compliance with DO-160 Section 22 radiated emissions and Section 25 temperature shock requirements due to hermetic packaging and TC trim capability. | Use Scenario: Calibrating handheld multimeters and portable oscilloscopes requiring traceable 5.000V reference points. IC Role / Device Role / Timing Role: Primary voltage standard in self-calibration loop, referenced against NIST-traceable standards during factory test. Use Value: Achieves <36 mV total excursion over −55°C to +125°C, eliminating need for oven-controlled references in field-deployable equipment. |
| Avionics Crowbar Protection | Bipolar Reference Generation |
Use Scenario: Overvoltage protection circuit triggering at 5.0V ±0.5% to safeguard flight control electronics. IC Role / Device Role / Timing Role: Precision threshold detector feeding SCR gate driver in fail-safe crowbar topology. Use Value: Delivers <12 mV breakdown shift over 0.6–15 mA current range, ensuring consistent trip point across varying load conditions. | Use Scenario: Generating matched ±5.0V rails for op-amp signal conditioning in inertial measurement units (IMUs). IC Role / Device Role / Timing Role: Dual-reference core: one unit configured as +5.0V, second as −5.0V via inverted connection and matched trimming. Use Value: Enables <0.02% common-mode rejection ratio (CMRR) improvement by matching TC and initial tolerance between dual references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM136AH-5.0/883 | Same LM136-5.0QML die, identical electrical specs, but marked per MIL-STD-883 Class B screening. | Approved for Class B (non-QML) space programs; lacks QML certification documentation package. | Select when full QML-38535 qualification is not mandated but same performance and TO-46 package are required. |
| REF5050QPWRQ1 | 5.0V series reference (not shunt); 3ppm/°C max TC, 0.1% initial accuracy, SOIC-8 package. | Lower noise and drift, but requires dedicated supply rail and cannot function as crowbar element or bidirectional reference. | Select for automotive ADAS sensor signal chains where ultra-low drift outweighs need for shunt flexibility and hermeticity. |
Compared with LM136AH-5.0/883 and REF5050QPWRQ1, the 8418002XA uniquely combines QML-38535 Class Q/V qualification, hermetic TO-46 packaging, and three-terminal trim capability-making it irreplaceable for crowbar circuits, bipolar references, and systems requiring zero-layout-change upgrades from legacy LM136 designs.
Availability
8418002XA is available at Aetrix Electronics and suitable for aerospace power monitoring, avionics crowbar protection, and precision instrumentation calibration requiring stable component supply across extended temperature and radiation-hardened environments.
Supply support for 8418002XA 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 high-reliability analog ICs for defense, space, and industrial markets.
The LM136QML product line delivers radiation-tolerant, temperature-stable shunt references designed specifically for MIL-PRF-38535-compliant systems where long-term parametric stability and hermetic reliability are non-negotiable.
FAQ
What is the exact reference voltage tolerance of 8418002XA at 25°C and 1 mA?
The 8418002XA (LM136-5.0QML grade) guarantees a reverse breakdown voltage of 4.83 V to 5.13 V at 1 mA and +25°C, corresponding to ±2.7% initial tolerance. This is verified per Subgroup 1 static testing in MIL-STD-883, and applies to all units shipped under this orderable part number.
Does 8418002XA support negative voltage reference configurations?
Yes, the 8418002XA supports negative reference use: connect Pin 1 (Anode) to the negative rail and Pin 2 (Cathode) to circuit ground, then derive −5.0V at Pin 1 relative to ground. Its shunt topology and symmetric forward/reverse characteristics enable true bidirectional operation without external inversion circuitry.
What is the maximum continuous reverse current rating for 8418002XA?
The absolute maximum reverse current for 8418002XA is 15 mA, as specified in the Absolute Maximum Ratings table. Continuous operation up to this level is permitted within the −55°C to +125°C ambient range, provided junction temperature remains ≤150°C-achievable with ≤10 mA at +125°C in still air per θJA = 354°C/W.
Can the temperature coefficient of 8418002XA be reduced below 10 ppm/°C?
Yes-by connecting four silicon signal diodes (e.g., 1N4148) in series with the Adjust terminal (Pin 3) as shown in Figure 13 of the datasheet, the 8418002XA's temperature coefficient can be trimmed to <10 ppm/°C when adjusted precisely to 5.00 V. This configuration is validated for QML-qualified units and used in flight-critical IMU references.
Is 8418002XA RoHS compliant?
No, 8418002XA is not RoHS compliant: the "RoHS" column in TI's Packaging Addendum explicitly states "No" for this orderable part number. It contains leaded solder and is intended for high-reliability military/aerospace applications where exemption from RoHS Directive 2011/65/EU applies under Annex III.
8418002XA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-206AB, TO-46-3 Metal Can
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 600 µA
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-46-3
8418002XA FAQ
1.How can I place an order for 8418002XA through Aetrix?
Please submit a Request for Quotation (RFQ) for 8418002XA 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 8418002XA reliable?
The price and inventory of 8418002XA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 8418002XA is usually 5 days.
3.What payment methods are accepted for 8418002XA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 8418002XA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 8418002XA?
8418002XA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 8418002XA 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 8418002XA?
For technical support, including 8418002XA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 8418002XA requirements.
6.How does Aetrix verify that 8418002XA is sourced from the original manufacturer or authorized distributors?
All 8418002XA 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 8418002XA meets industry standards.
7.What is the process for return or replacement of 8418002XA?
All 8418002XA units undergo pre-shipment inspection (PSI). If there is an issue with 8418002XA, 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 8418002XA part is unused and in its original packaging.
Return procedure for 8418002XA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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