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Texas Instruments LM136AH-2.5/NOPB
- Part No.:
- LM136AH-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-206AB, TO-46-3 Metal Can
- Datasheet:
-
LM136AH-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 1% TO46-3
- Quantity:
- Payment:
- Shipping:
Inventory:475
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Product details
Overview
LM136AH-2.5/NOPB from Texas Instruments is a precision 2.5V shunt voltage reference diode designed for high-stability analog and mixed-signal systems. It delivers ±1% initial tolerance, 0.2Ω dynamic impedance, and operates across −55°C to +125°C with 400 μA–10 mA wide regulation current range-enabling stable 2.5V references directly from 5V logic rails in digital voltmeters, power supplies, and op amp circuits.
For engineers reviewing the LM136AH-2.5/NOPB datasheet, LM136AH-2.5/NOPB pinout, LM136AH-2.5/NOPB application, or LM136AH-2.5/NOPB equivalent, key selection criteria include temperature coefficient trim capability, low dynamic impedance for noise-sensitive references, aerospace-grade operating range, and TO-metal-can package thermal robustness.
Technical Context
The LM136AH-2.5/NOPB functions as a monolithic, three-terminal shunt regulator-distinct from standard zener diodes by integrating a trimming terminal (Pin 3) that enables independent adjustment of reference voltage and temperature coefficient. Its architecture supports both positive and negative voltage reference configurations without external polarity inversion.
It achieves precision via low-temperature-coefficient design (12–18 mV over −55°C to +125°C), fast turn-on response, and built-in ESD protection. The device's 0.2Ω dynamic impedance ensures minimal output voltage variation under load transients, critical for ADC reference buffers and calibration circuits requiring sub-mV stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.490 V nominal (trimmed); ±1% initial tolerance ensures accurate system-level calibration without post-manufacture trimming. |
| Operating Current Range | 400 μA to 10 mA-supports low-power sensor interfaces and high-current reference buffering without external current limiting. |
| Dynamic Impedance | 0.2 Ω at 1 mA-minimizes AC ripple coupling into reference nodes, enabling clean 16-bit+ ADC performance. |
| Temperature Stability | 12–18 mV over −55°C to +125°C-guarantees <±7.2 ppm/°C drift for aerospace and industrial control applications. |
| Package Type | TO-metal-can (NDV), 3-pin-provides superior thermal dissipation (θJA = 440°C/W) and hermetic reliability vs. plastic packages. |
| Max Reverse Current | 15 mA-defines safe upper limit for shunt regulation; exceeds typical 10 mA operating max to prevent thermal runaway. |
| Storage Temp Range | −60°C to +150°C-enables long-term storage in extreme environments without parameter shift or metallization degradation. |
Pinout & Package
LM136AH-2.5/NOPB uses a hermetically sealed TO-metal-can (NDV) package with 3 terminals. This package provides enhanced thermal conductivity, moisture resistance, and long-term stability versus plastic alternatives-critical for military, avionics, and downhole instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current sink node | Connects to ground or negative rail; sets reference polarity when used as negative reference. |
| Cathode (Pin 2) | Output reference node | Delivers regulated 2.5V; must be decoupled with ≥10 nF capacitor for stability in high-frequency circuits. |
| Adjust (Pin 3) | Trim control terminal | Enables external potentiometer connection to minimize temperature drift or fine-tune voltage to 2.490 V for metrology-grade accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Three-terminal trimmable architecture | Independent adjustment of reference voltage and temperature coefficient via Pin 3-eliminates need for matched resistor networks or dual-trim circuits. |
| Low dynamic impedance | 0.2 Ω ensures <0.2 mV output change per 1 mA load step-essential for high-resolution data acquisition front-ends. |
| Wide regulation current range | 400 μA–10 mA operation allows use in ultra-low-power IoT sensors and high-current reference buffers without redesign. |
| Aerospace-grade temperature range | −55°C to +125°C operation validated per MIL-PRF-19500-supports flight-critical avionics and satellite power management. |
| Hermetic TO-metal-can packaging | NDV package prevents moisture ingress and intermetallic migration-ensures >20-year parametric stability in harsh environments. |
Applications
| Digital Voltmeter Calibration | Industrial Power Supply Reference |
|---|---|
Use Scenario: Precision DC voltage measurement in handheld and benchtop DVMs requiring traceable 2.5V reference for 5½-digit resolution. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable excitation for ADC input scaling and internal DAC feedback loops. Use Value: ±1% initial tolerance and <18 mV tempco over full range enable factory calibration validity for 2+ years without recalibration. | Use Scenario: Regulation feedback node in isolated DC-DC converters and programmable lab power supplies where output accuracy must hold across ambient extremes. IC Role / Device Role / Timing Role: Primary voltage setpoint generator referenced to isolated secondary-side ground. Use Value: 0.2Ω dynamic impedance rejects switching noise from transformer leakage, maintaining <0.01% output error during transient load steps. |
| Avionics Sensor Signal Conditioning | High-Reliability Data Acquisition System |
Use Scenario: Biasing and scaling of RTD, thermocouple, and strain gauge signals in flight control computers operating at −55°C to +125°C. IC Role / Device Role / Timing Role: Precision excitation source and ADC reference in ratiometric measurement chains. Use Value: Hermetic TO-can package and −55°C to +125°C rating ensure zero parameter shift during thermal cycling in unpressurized bays. | Use Scenario: Reference for 16-bit SAR and delta-sigma ADCs in oil & gas downhole logging tools exposed to high pressure and temperature. IC Role / Device Role / Timing Role: Low-noise, low-drift reference for analog front-end gain stages and ADC reference inputs. Use Value: Trim-adjustable tempco allows compensation of PCB thermal gradients, achieving <2 ppm/°C effective drift in stacked multilayer assemblies. |
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. | Commercial-grade only; lacks trim terminal; unsuitable for aerospace or extended-temp industrial use. | Select when cost, board space, or reflow compatibility outweighs temperature range and trim flexibility. |
| REF5025AIDR | Series reference (not shunt); SOIC-8; ±0.05% initial tolerance; 3 ppm/°C tempco; 10 μVpp noise. | Requires external pass transistor for high current; not drop-in compatible; higher cost and complexity. | Select only when ultra-high precision and ultra-low noise supersede simplicity, power efficiency, and direct shunt topology. |
Compared with LM336BM-2.5/NOPB, LM136AH-2.5/NOPB offers wider temperature range and trim capability at the cost of larger footprint; compared with REF5025AIDR, it provides simpler biasing, lower quiescent current, and inherent fault tolerance-but trades absolute accuracy and noise performance for ruggedness and ease of use.
Availability
LM136AH-2.5/NOPB is available at Aetrix Electronics and suitable for avionics power management, downhole instrumentation, and high-reliability industrial control systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM136AH-2.5/NOPB 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 for industrial, automotive, aerospace, and communications markets.
The LM136 series belongs to TI's precision voltage reference product line, engineered specifically for applications demanding long-term stability, wide temperature operation, and field-adjustable calibration-such as test equipment, military electronics, and safety-critical power systems.
FAQ
What is the maximum reverse current rating for LM136AH-2.5/NOPB?
The absolute maximum reverse current for LM136AH-2.5/NOPB is 15 mA, as specified in the Absolute Maximum Ratings table. Operating continuously above this value risks thermal damage or parameter shift. For reliable long-term operation, TI recommends staying within the 400 μA–10 mA regulation range-where the device maintains its specified 2.490 V output and 0.2 Ω dynamic impedance. LM136AH-2.5/NOPB must be externally current-limited using a series resistor calculated per application load and input voltage.
Can LM136AH-2.5/NOPB be used as a negative voltage reference?
Yes, LM136AH-2.5/NOPB can function as a negative voltage reference by connecting its anode (Pin 1) to the system's positive rail and its cathode (Pin 2) to the desired negative reference node. This configuration leverages its shunt regulator topology to sink current and establish a stable −2.5V relative to the positive rail. The adjust terminal (Pin 3) remains functional for tempco trimming. LM136AH-2.5/NOPB datasheet Figure 23 explicitly illustrates this bipolar output reference implementation.
Does LM136AH-2.5/NOPB require an external capacitor for stability?
Yes, LM136AH-2.5/NOPB requires a minimum 10 nF ceramic capacitor between cathode (Pin 2) and anode (Pin 1) to ensure stability under varying load conditions and suppress high-frequency oscillation. TI's Application Hints section recommends this capacitor be placed as close as possible to the device pins. Larger values (e.g., 100 nF) further reduce output noise but do not affect regulation accuracy. Without this capacitor, LM136AH-2.5/NOPB may exhibit ringing or instability in high-speed or high-impedance circuits.
What is the purpose of the third terminal (Pin 3) on LM136AH-2.5/NOPB?
The third terminal (Pin 3) on LM136AH-2.5/NOPB is the adjust terminal, enabling independent trimming of either the reference voltage or its temperature coefficient-or both-using an external potentiometer. Unlike two-terminal zeners, this feature allows precise calibration to 2.490 V and minimization of drift across temperature. Figures 14 and 15 in the LM136AH-2.5/NOPB datasheet show standard configurations: one for voltage adjustment only, and another (with added diodes) for tempco optimization. Pin 3 must never be left floating.
How does the TO-metal-can (NDV) package of LM136AH-2.5/NOPB improve reliability over plastic packages?
The TO-metal-can (NDV) package of LM136AH-2.5/NOPB provides hermetic sealing against moisture, contaminants, and outgassing-critical for long-term parametric stability in humid, corrosive, or vacuum environments. Its copper-iron alloy case offers superior thermal conductivity (θJA = 440°C/W) and mechanical robustness versus TO-92 or SOIC packages, reducing thermal stress-induced drift. LM136AH-2.5/NOPB's −55°C to +125°C rating is validated only in this package, making it suitable for aerospace, defense, and downhole applications where plastic alternatives fail prematurely.
LM136AH-2.5/NOPB 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/NOPB FAQ
1.How can I place an order for LM136AH-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM136AH-2.5/NOPB 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/NOPB reliable?
The price and inventory of LM136AH-2.5/NOPB 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/NOPB is usually 5 days.
3.What payment methods are accepted for LM136AH-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM136AH-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM136AH-2.5/NOPB?
LM136AH-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM136AH-2.5/NOPB 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/NOPB?
For technical support, including LM136AH-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM136AH-2.5/NOPB requirements.
6.How does Aetrix verify that LM136AH-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM136AH-2.5/NOPB 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/NOPB meets industry standards.
7.What is the process for return or replacement of LM136AH-2.5/NOPB?
All LM136AH-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM136AH-2.5/NOPB, 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/NOPB part is unused and in its original packaging.
Return procedure for LM136AH-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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