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Texas Instruments LM136AH-2.5
- Part No.:
- LM136AH-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-206AB, TO-46-3 Metal Can
- Datasheet:
-
LM136AH-2.5.pdf
- Description:
- IC VREF SHUNT 1% TO46-3
- Quantity:
- Payment:
- Shipping:
Inventory:540
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Product details
Overview
LM136AH-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 LM136AH-2.5 datasheet, LM136AH-2.5 pinout, LM136AH-2.5 application, or LM136AH-2.5 equivalent, key selection considerations include its wide temperature range, trimmable reference voltage and temperature coefficient, low dynamic impedance, and suitability for both positive and negative reference configurations in precision analog systems.
Technical Context
The LM136AH-2.5 operates as a monolithic shunt regulator with zener-like behavior but enhanced stability and trim capability. Its third terminal enables independent adjustment of output voltage and temperature coefficient-critical for minimizing drift in high-accuracy measurement systems.
It functions across a broad reverse current range (400 μA–10 mA) without requiring series pass transistors, and maintains specified performance over its full −55°C to +125°C operating junction temperature range, unlike the LM236 or LM336 variants with narrower thermal ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.490 V (typical, trimmed), 2.465–2.515 V (min–max at 25°C for A-grade) |
| Initial Tolerance | ±1% (ensures ≤25 mV absolute error at 25°C before trimming) |
| Temperature Stability | 12–18 mV over −55°C to +125°C (defines max drift in untrimmed operation) |
| Dynamic Impedance | 0.2 Ω (typical at 1 mA; ensures minimal output voltage shift under load transients) |
| Operating Current Range | 400 μA to 10 mA (supports low-power sensing and high-current buffering without external components) |
| Junction Temp Range | −55°C to +150°C (enables use in aerospace, industrial, and extended-temperature embedded systems) |
| Package Thermal Resistance | θJA = 440°C/W (TO-NDV metal can; requires heatsinking for >5 mA continuous dissipation) |
Pinout & Package
LM136AH-2.5 is housed in a hermetically sealed TO-metal-can (NDV) package with three leads: Cathode, Anode, and Adjust. The metal case serves as a thermal and electrical shield, and the package is optimized for high-reliability, low-noise analog references.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Reference Output Node | Connected to regulated 2.5V node; sinks current from external bias resistor into load or ground |
| Anode (Pin 2) | Ground/Return Path | Provides return path for cathode current; tied to system ground or negative rail in dual-supply configurations |
| Adjust (Pin 3) | Trim Control Terminal | Enables external potentiometer connection to fine-tune reference voltage and minimize temperature coefficient independently |
Key Features
| Feature | Design Value |
|---|---|
| Low Temperature Coefficient | Minimizable to <10 ppm/°C via Pin 3 trim-enables sub-0.1% total drift over full temperature range |
| Wide Operating Current | 400 μA–10 mA range eliminates need for current-boosting stages in battery-powered or high-precision systems |
| 0.2Ω Dynamic Impedance | Ensures <0.2 mV output shift per 1 mA load change-critical for ADC reference stability and op-amp feedback accuracy |
| ±1% Initial Tolerance | Reduces pre-trim calibration effort in production test; supports 12-bit+ system accuracy without factory trimming |
| Shunt Configuration Flexibility | Supports both positive (cathode to VREF) and negative (anode to VREF) reference topologies in single- or dual-supply designs |
Applications
| Digital Voltmeter Reference | Op-Amp Precision Biasing |
|---|---|
Use Scenario: High-resolution handheld DVM measuring 0–20 V full-scale with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 2.5V reference for ADC internal conversion and display scaling circuitry. Use Value: Enables ±0.02% reading accuracy over −20°C to +70°C ambient due to trimmable temperature coefficient and low dynamic impedance. | Use Scenario: Rail-to-rail instrumentation amplifier front-end with matched gain-setting resistors. IC Role / Device Role / Timing Role: Supplies precise 2.5V common-mode bias to input stage and reference for output level-shifting. Use Value: Maintains <10 μV/V PSRR and <0.5 μV/°C offset drift by rejecting supply ripple and thermal gradients. |
| 5V Logic-Derived Reference | Low-Noise Power Supply Monitor |
Use Scenario: Microcontroller-based sensor node powered from 5V USB supply requiring accurate 2.5V ADC reference. IC Role / Device Role / Timing Role: Shunt-regulated reference sourced directly from 5V rail via series resistor; no LDO needed. Use Value: Achieves 2.5V ±0.5% stability across 4.5–5.5V input variation and 100 μA–5 mA load current-reducing BOM count. | Use Scenario: Industrial PLC module monitoring 24V DC power rail for brownout detection. IC Role / Device Role / Timing Role: Serves as precision threshold reference for comparator-based undervoltage lockout (UVLO). Use Value: Guarantees trip point repeatability within ±2 mV over 10-year field life due to <20 ppm long-term stability. |
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 (B-grade), 0.4Ω dynamic impedance | Limited to commercial-temperature PCBs; lacks trim pin; higher impedance reduces transient immunity | Choose for cost-sensitive, space-constrained consumer designs where full temp range and trim are unnecessary |
| TL431ACDR | Adjustable 2.495V reference, SOIC-8, ±1% tolerance, 0.22Ω impedance, no dedicated trim pin, requires external resistors for fixed 2.5V | Not pin-compatible; needs two resistors to set 2.5V; lower max temp (−40°C to +125°C); no direct temperature-coefficient tuning | Choose when leveraging existing TL431 footprint or needing adjustable output; avoid when minimum drift or hermetic packaging is required |
Compared with LM336BM-2.5/NOPB and TL431ACDR, the LM136AH-2.5 uniquely combines military-grade temperature range, hermetic TO-metal-can reliability, and independent voltage/temperature trim-making it irreplaceable in aerospace, downhole, and high-stability metrology applications where long-term drift and environmental robustness are non-negotiable.
Availability
LM136AH-2.5 is available at Aetrix Electronics and suitable for precision instrumentation, aerospace avionics, and industrial control systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM136AH-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 leader specializing in analog, embedded processing, and high-reliability components, with decades of heritage in precision reference design.
The LM136 series was engineered specifically for high-stability, wide-temperature shunt references in mission-critical analog systems-prioritizing low drift, hermetic packaging, and field-trimmable performance over cost or integration density.
FAQ
What is the maximum operating temperature for LM136AH-2.5?
The LM136AH-2.5 is rated for operation from −55°C to +125°C ambient, with a maximum junction temperature of +150°C. Its TO-metal-can (NDV) package provides superior thermal conduction versus plastic packages, enabling reliable operation in high-temperature industrial or under-hood automotive environments when properly heatsinked.
Does LM136AH-2.5 require an external capacitor for stability?
No, the LM136AH-2.5 does not require an external capacitor for basic shunt regulation stability. Its 0.2Ω dynamic impedance and internal design ensure inherent stability across its 400 μA–10 mA operating range. However, a 10 nF ceramic capacitor from cathode to ground is recommended in noisy environments to suppress high-frequency ripple on the reference node.
Can LM136AH-2.5 be used as a negative voltage reference?
Yes, LM136AH-2.5 can function as a negative voltage reference by connecting its anode to the desired negative rail and cathode to ground or signal return. This configuration leverages its shunt topology to regulate a stable −2.5V reference relative to system ground-commonly used in dual-supply op-amp biasing and bipolar data acquisition systems.
How is the temperature coefficient trimmed on LM136AH-2.5?
The LM136AH-2.5's temperature coefficient is trimmed using an external potentiometer connected between the Adjust (Pin 3) and Anode (Pin 2), while monitoring output voltage across temperature. As shown in Figure 15 of the datasheet, adding two silicon signal diodes (e.g., 1N4148) in series with the potentiometer allows independent minimization of drift-achieving <10 ppm/°C when adjusted to 2.490V.
Is LM136AH-2.5 RoHS compliant?
Yes, the LM136AH-2.5/NOPB variant is RoHS compliant (lead-free). Per TI's Package Option Addendum, LM136AH-2.5/NOPB carries "Yes" in the RoHS column, uses lead-free lead finish, and meets JEDEC Level-1 moisture sensitivity requirements. Standard LM136AH-2.5 (non-NOPB) is not RoHS compliant and contains lead.
LM136AH-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:
- ±1%
- 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
LM136AH-2.5 FAQ
1.How can I place an order for LM136AH-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM136AH-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 LM136AH-2.5 reliable?
The price and inventory of LM136AH-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 LM136AH-2.5 is usually 5 days.
3.What payment methods are accepted for LM136AH-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM136AH-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM136AH-2.5?
LM136AH-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM136AH-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 LM136AH-2.5?
For technical support, including LM136AH-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM136AH-2.5 requirements.
6.How does Aetrix verify that LM136AH-2.5 is sourced from the original manufacturer or authorized distributors?
All LM136AH-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 LM136AH-2.5 meets industry standards.
7.What is the process for return or replacement of LM136AH-2.5?
All LM136AH-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM136AH-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 LM136AH-2.5 part is unused and in its original packaging.
Return procedure for LM136AH-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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