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Texas Instruments LM136H-2.5
- Part No.:
- LM136H-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-206AB, TO-46-3 Metal Can
- Datasheet:
-
LM136H-2.5.pdf
- Description:
- IC VREF SHUNT 2% TO46-3
- Quantity:
- Payment:
- Shipping:
Inventory:706
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Product details
Overview
LM136H-2.5 from Texas Instruments is a precision 2.5V shunt voltage reference diode in a TO-metal-can (NDV) package, rated for −55°C to +125°C operation, with ±1% initial tolerance, 0.2Ω dynamic impedance, and 400 μA to 10 mA operating current range. It serves as a stable low-voltage reference in digital voltmeters, op-amp biasing, and 5V-supply-derived reference circuits.
For engineers reviewing the LM136H-2.5 datasheet, LM136H-2.5 pinout, LM136H-2.5 application, or LM136H-2.5 equivalent, key selection criteria include temperature stability over extended industrial/military ranges, trimmable voltage/temperature coefficient, low dynamic impedance for noise-sensitive analog systems, and compatibility with shunt-regulator topologies requiring third-terminal adjustment.
Technical Context
The LM136H-2.5 operates as a monolithic 2.5V zener-based shunt regulator with a three-terminal configuration enabling independent trimming of reference voltage and temperature coefficient. Its architecture supports both positive and negative voltage reference configurations without polarity reversal.
It features a low 0.2Ω dynamic impedance at 1 mA reverse current and specified temperature stability of 12–18 mV over −55°C to +125°C, with guaranteed performance across its full military-grade operating range - distinct from commercial LM336 or industrial LM236 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.490 V nominal (trimmable ±70 mV); enables precise 2.5V generation from 5V logic rails |
| Initial Tolerance | ±1% at 25°C; reduces calibration burden in production test fixtures |
| Operating Current | 400 μA to 10 mA; supports low-power sensor interfaces and high-current buffer stages |
| Dynamic Impedance | 0.2 Ω at 1 mA; minimizes output voltage variation under load transients |
| Temp Stability | 12–18 mV over −55°C to +125°C; ensures stable ADC reference or DAC bias across extreme environments |
| Package | TO-metal-can (NDV), 3-pin; provides hermetic sealing and superior thermal dissipation vs. plastic TO-92 |
| Max Reverse Current | 15 mA; defines safe operating area for series resistor sizing in shunt configurations |
Pinout & Package
LM136H-2.5 uses a TO-metal-can (NDV) package with 3 terminals: Cathode, Anode, and Adjust. The metal case serves as the cathode connection and provides mechanical robustness and thermal conduction path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Case) | Reference output node | Connected directly to metal can; requires PCB thermal pad or heatsink for >5 mA operation |
| Anode | Current sink return | Completes shunt path; tied to ground or negative rail in negative-reference configurations |
| Adjust | Trim control terminal | Enables external potentiometer to fine-tune voltage or minimize temperature drift without affecting impedance |
Key Features
| Feature | Design Value |
|---|---|
| Third-terminal voltage trim | Allows ±70 mV adjustment range while preserving low dynamic impedance and stability |
| Wide operating current range | 400 μA–10 mA enables use in ultra-low-power sensor nodes and high-accuracy buffered references |
| Low temperature coefficient | 12–18 mV drift over −55°C to +125°C supports aerospace and downhole instrumentation |
| Hermetic TO-metal-can package | NDV package ensures long-term reliability in humid, corrosive, or high-vibration environments |
| Fast turn-on response | Sub-microsecond stabilization enables use in pulsed reference or power-up sequencing circuits |
Applications
| Digital Voltmeter Reference | Industrial Power Supply Monitor |
|---|---|
Use Scenario: Precision DC voltage measurement in handheld or benchtop multimeters requiring stable 2.5V reference for 16-bit ADCs. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation for ratiometric scaling and offset correction in analog front-end circuitry. Use Value: ±1% initial tolerance and <18 mV temp drift ensure <0.1% full-scale error across operating temperature without recalibration. | Use Scenario: Monitoring regulated 5V/3.3V rails in PLC I/O modules exposed to −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Low-drift 2.5V reference for comparator threshold generation and ADC reference in isolated power supervision circuits. Use Value: Hermetic NDV package and −55°C to +125°C rating guarantee reliability in wide-temperature industrial enclosures. |
| Aerospace Sensor Biasing | High-Accuracy Op-Amp Circuitry |
Use Scenario: Providing stable bias for strain-gauge amplifiers in flight control sensors where thermal gradients exceed 100°C. IC Role / Device Role / Timing Role: Trimmed shunt reference with minimized temperature coefficient used as gain-setting node in instrumentation amplifier feedback networks. Use Value: Adjustable trim allows compensation of op-amp input offset drift, achieving <2 ppm/°C system-level reference stability. | Use Scenario: Setting precise common-mode voltage or reference level in rail-to-rail op-amp buffers for data acquisition systems. IC Role / Device Role / Timing Role: Low-impedance 2.5V source driving high-capacitance loads (e.g., 10 nF sampling capacitors) without droop or settling delay. Use Value: 0.2Ω dynamic impedance ensures <10 μV step error during 10 mA transient loading, critical for 18-bit SAR ADC drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM336BM-2.5/NOPB | SOIC-8 package; 0°C to +70°C rating; ±0.5% initial tolerance; 0.4Ω dynamic impedance | Designed for commercial-grade PCB assembly with reflow compatibility; lacks trim terminal and extended temp range | Select when cost, board space, or automated assembly outweigh military-temp and trim requirements |
| LM236H-2.5/NOPB | Same TO-NDV package; −25°C to +85°C rating; ±1% tolerance; 0.2Ω impedance; no trim terminal | Industrial-grade variant without adjust pin; lower cost but no temperature-coefficient optimization capability | Select for non-critical industrial applications where trim is unnecessary and full military temp range is not required |
Compared with LM336BM-2.5/NOPB and LM236H-2.5/NOPB, the LM136H-2.5 uniquely delivers military-temperature operation, hermetic packaging, and third-terminal trim - making it the only choice for applications demanding simultaneous precision, ruggedness, and field-adjustability.
Availability
LM136H-2.5 is available at Aetrix Electronics and suitable for digital voltmeters, industrial power supply monitors, aerospace sensor biasing, and high-accuracy op-amp circuitry requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM136H-2.5 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 headquartered in Dallas, Texas, specializing in analog ICs, embedded processors, and high-reliability components for industrial, automotive, and aerospace markets.
The LM136 series was designed specifically for precision shunt reference applications requiring extended temperature operation, low dynamic impedance, and field-trimmable voltage/temperature performance - targeting instrumentation, defense, and harsh-environment systems.
FAQ
What is the maximum operating temperature range for the LM136H-2.5?
The LM136H-2.5 is rated for continuous operation from −55°C to +125°C. This extended temperature range is confirmed in TI's official datasheet SNVS749F and distinguishes it from LM236 (−25°C to +85°C) and LM336 (0°C to +70°C) variants. The LM136H-2.5 maintains its 2.490 V nominal output and ≤18 mV temperature stability across this full range, making it suitable for aerospace, downhole, and military applications where thermal extremes are expected. The TO-metal-can (NDV) package contributes to this robustness via hermetic sealing and superior thermal conduction.
Does the LM136H-2.5 require an external resistor for basic operation?
Yes, the LM136H-2.5 requires an external series current-limiting resistor when used as a shunt reference. This resistor sets the reverse current (IR) within the specified 400 μA to 10 mA operating range, ensuring stable regulation and avoiding damage from exceeding the 15 mA absolute maximum reverse current. For example, with a 5V supply and target IR = 1 mA, a 2.5 kΩ resistor is appropriate. The LM136H-2.5 itself does not integrate current regulation - its function depends entirely on proper external biasing, and incorrect resistor selection will cause output voltage deviation or thermal runaway.
Can the LM136H-2.5 be used as a negative voltage reference?
Yes, the LM136H-2.5 can be configured as a negative voltage reference by reversing its connection: tie the Anode to the system ground and use the Cathode (metal case) as the negative reference output. In this configuration, the device regulates −2.490 V relative to ground, maintaining the same ±1% tolerance and low dynamic impedance. This dual-polarity capability is explicitly supported in TI's datasheet Figure 22 (Op Amp with Output Clamped) and Application Hints section, and is enabled by its shunt-regulator topology - unlike series references that are polarity-fixed. The NDV package's isolated case simplifies mounting in either orientation.
How is the adjust terminal used to minimize temperature coefficient in the LM136H-2.5?
The adjust terminal of the LM136H-2.5 is used with two series silicon signal diodes (e.g., 1N4148) and a potentiometer, as shown in TI's Figure 15. When the output is trimmed to exactly 2.490 V, the temperature coefficient reaches its minimum - typically below 10 ppm/°C. The diodes must be thermally coupled to the LM136H-2.5 (e.g., mounted adjacent on the PCB) to ensure matched thermal tracking. This technique exploits the opposing TC of the diodes and the LM136H-2.5's internal structure. The LM136H-2.5 datasheet confirms this method achieves "minimum temperature coefficient" and specifies a typical ±120 mV trim range for this configuration.
Is the LM136H-2.5 RoHS compliant?
Yes, the LM136H-2.5/NOPB variant is RoHS compliant, as confirmed in TI's Package Option Addendum (15-Jul-2026). The "/NOPB" suffix indicates lead-free finish and compliance with EU RoHS Directive 2011/65/EU. Standard LM136H-2.5 (without /NOPB) uses leaded terminations and is not RoHS compliant. Both versions share identical electrical specifications and NDV package dimensions, but only LM136H-2.5/NOPB meets modern environmental compliance requirements for commercial and industrial PCB assembly. Always verify the full orderable part number - LM136H-2.5/NOPB - when specifying for RoHS-constrained designs.
LM136H-2.5 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):
- 2.49V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±2%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 400 µA
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-46-3
LM136H-2.5 FAQ
1.How can I place an order for LM136H-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM136H-2.5 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 LM136H-2.5 reliable?
The price and inventory of LM136H-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM136H-2.5 is usually 5 days.
3.What payment methods are accepted for LM136H-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM136H-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM136H-2.5?
LM136H-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM136H-2.5 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 LM136H-2.5?
For technical support, including LM136H-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM136H-2.5 requirements.
6.How does Aetrix verify that LM136H-2.5 is sourced from the original manufacturer or authorized distributors?
All LM136H-2.5 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 LM136H-2.5 meets industry standards.
7.What is the process for return or replacement of LM136H-2.5?
All LM136H-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM136H-2.5, 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 LM136H-2.5 part is unused and in its original packaging.
Return procedure for LM136H-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM136H-2.5 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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