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Texas Instruments LM236AH-2.5/NOPB
- Part No.:
- LM236AH-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-206AB, TO-46-3 Metal Can
- Datasheet:
-
LM236AH-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 1% TO46-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,068
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Product details
Overview
LM236AH-2.5/NOPB from Texas Instruments is a precision 2.5V shunt voltage reference IC designed for stable low-voltage referencing in analog and mixed-signal circuits. It delivers ±1% initial tolerance, 0.2Ω dynamic impedance, and operates across −25°C to +85°C with 400 μA to 10 mA wide regulation current range - enabling direct use from 5V logic rails in digital voltmeters, power supply feedback loops, and op-amp reference designs.
For engineers reviewing the LM236AH-2.5/NOPB datasheet, LM236AH-2.5/NOPB pinout, LM236AH-2.5/NOPB application, or LM236AH-2.5/NOPB equivalent, key selection considerations include its TO-metal-can (NDV) package thermal performance, trimmable reference voltage, temperature coefficient stability over industrial temperature range, and compatibility with shunt-regulator biasing topologies requiring minimal external components.
Technical Context
The LM236AH-2.5/NOPB functions as a monolithic 2.5V zener-based shunt regulator with third-terminal adjustability for voltage trimming and temperature coefficient optimization. Its internal architecture supports both positive and negative reference configurations without polarity reversal circuitry.
It exhibits low 3.5–9 mV temperature stability over −25°C to +85°C, 0.2Ω typical dynamic impedance at 1 mA, and fast turn-on response - making it suitable for closed-loop feedback paths where reference drift and output impedance directly impact system accuracy and transient rejection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.490 V nominal; trimmed to ±1% initial accuracy at 1 mA - ensures predictable ADC/DAC reference point without calibration. |
| Temperature Stability | 3.5–9 mV over −25°C to +85°C - defines maximum reference drift in industrial ambient conditions. |
| Dynamic Impedance | 0.2 Ω typical at 1 mA - minimizes load-induced voltage variation during current transients. |
| Operating Current Range | 400 μA to 10 mA - enables biasing from low-power microcontrollers or high-current regulators without external current limiting. |
| Initial Tolerance | ±1% - reduces need for post-assembly trimming in production test flows. |
| Package Thermal Resistance | θJA = 440°C/W (TO-NDV) - informs heatsinking requirements under worst-case power dissipation. |
Pinout & Package
LM236AH-2.5/NOPB uses a 3-pin TO-metal-can (NDV) package with hermetic sealing and improved thermal performance versus plastic TO-92. The can body serves as the cathode terminal, supporting robust operation in thermally demanding environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current sink input | Connects to regulated output node; reverse-biased current flows into this terminal to maintain 2.5V reference. |
| Cathode (Can Body) | Reference voltage output | Provides 2.5V reference potential; electrically connected to metal can - requires proper PCB grounding or heatsinking. |
| Adjust (Pin 2) | Trim control | Enables fine-tuning of breakdown voltage and temperature coefficient via external potentiometer or diode network per Figure 14/15. |
Key Features
| Feature | Design Value |
|---|---|
| Low temperature coefficient | Optimized to ≤9 mV drift over −25°C to +85°C - maintains reference integrity in uncontrolled industrial enclosures. |
| Easily trimmed reference | Third-terminal adjustment allows voltage tuning ±70 mV and temperature coefficient minimization at 2.490 V - eliminates need for laser trimming in cost-sensitive designs. |
| Wide operating current | Stable regulation from 400 μA to 10 mA - accommodates standby and active modes without redesigning bias networks. |
| Shunt regulator flexibility | Operates as either positive or negative reference - simplifies design reuse across rail-to-rail sensing and bipolar supply monitoring. |
Applications
| Digital Voltmeter Reference | Power Supply Feedback Loop |
|---|---|
Use Scenario: Provides stable 2.5V reference for 12-bit ADC in handheld DVMs measuring 0–20V ranges. IC Role / Device Role / Timing Role: Shunt voltage reference establishing absolute scaling factor for analog-to-digital conversion. Use Value: ±1% initial tolerance and <9 mV tempco ensure measurement repeatability across battery-powered field use without recalibration. | Use Scenario: Sets output voltage in adjustable linear regulator (e.g., LM317-based) or switching converter feedback path. IC Role / Device Role / Timing Role: Precision shunt reference replacing resistor-divider to improve load/line regulation and thermal stability. Use Value: 0.2Ω dynamic impedance prevents output voltage sag during load transients, improving PSRR by >20 dB vs. passive dividers. |
| Op-Amp Precision Biasing | Calibration Standard Generator |
Use Scenario: Supplies reference voltage to instrumentation amplifier input stage in sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Low-noise, low-drift DC reference source for offset nulling and gain-setting networks. Use Value: Trimmed 2.490V operation minimizes temperature-induced zero-shift in bridge amplifiers used with strain gauges or RTDs. | Use Scenario: Generates traceable 2.5V calibration signal for benchtop multimeters and automated test equipment. IC Role / Device Role / Timing Role: Primary voltage standard in self-contained calibration module with buffered output. Use Value: Long-term stability of 20 ppm/1000 hrs ensures calibration validity between annual metrology audits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM336Z-2.5/NOPB | TO-92 plastic package; 0°C to +70°C rating; ±2% initial tolerance; higher 12–18 mV tempco. | Lower-cost alternative for commercial-grade applications where extended temperature range and tighter tolerance are not required. | Select when budget constraints outweigh industrial temperature and precision needs. |
| TL431ACDR | Adjustable 2.495V reference; SOIC-8; 0°C to +70°C; 0.2% initial tolerance; 0.22Ω dynamic impedance. | Requires two external resistors for fixed 2.5V setup; better suited for high-accuracy, volume-manufactured power supplies. | Choose for designs needing sub-0.5% accuracy and PCB space efficiency over hermetic reliability. |
Compared with LM336Z-2.5/NOPB, the LM236AH-2.5/NOPB offers superior thermal stability and hermetic packaging for harsh environments; compared with TL431ACDR, it provides simpler biasing and no resistor network dependency but trades off absolute accuracy and surface-mount compatibility.
Availability
LM236AH-2.5/NOPB is available at Aetrix Electronics and suitable for industrial instrumentation, power supply feedback, and precision analog measurement systems requiring stable component supply with long-term availability assurance.
Supply support for LM236AH-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 connectivity technologies with over 50 years of innovation in precision analog ICs.
The LM236 series belongs to TI's legacy precision shunt reference product line, engineered specifically for industrial and test equipment applications demanding reliable, trimmable, and thermally robust voltage references.
FAQ
What is the operating temperature range of the LM236AH-2.5/NOPB?
The LM236AH-2.5/NOPB is rated for operation from −25°C to +85°C. Its maximum junction temperature is 125°C, and thermal resistance θJA is 440°C/W in the TO-NDV metal-can package. This makes it suitable for industrial environments where ambient temperatures exceed consumer-grade limits but do not reach extended military ranges.
How does the adjust pin (Pin 2) function in the LM236AH-2.5/NOPB?
The adjust pin (Pin 2) on the LM236AH-2.5/NOPB enables precise trimming of both reference voltage and temperature coefficient. When configured with an external potentiometer (Figure 14), it allows ±70 mV adjustment; with two series diodes (Figure 15), it minimizes tempco at 2.490 V. This pin must never be left floating and requires proper decoupling in high-noise environments.
Can the LM236AH-2.5/NOPB be used as a negative voltage reference?
Yes, the LM236AH-2.5/NOPB can operate as a negative voltage reference by reversing its connection: the anode (Pin 1) connects to ground, and the cathode (metal can) connects to the negative rail. Its shunt architecture supports bidirectional polarity use without additional components, maintaining 2.5V regulation relative to the chosen reference node.
What is the maximum reverse current rating for the LM236AH-2.5/NOPB?
The absolute maximum reverse current for the LM236AH-2.5/NOPB is 15 mA. However, the recommended operating range is 400 μA to 10 mA per datasheet specifications. Exceeding 10 mA risks exceeding the device's power dissipation limit (PD = VREF × IR ≈ 25 mW at 10 mA), especially without adequate heatsinking in the TO-NDV package.
Is the LM236AH-2.5/NOPB RoHS compliant?
Yes, the LM236AH-2.5/NOPB is RoHS compliant, as confirmed in TI's Package Option Addendum. The "/NOPB" suffix explicitly denotes lead-free (Pb-free) construction, meeting EU Directive 2011/65/EU requirements. Its lead finish is specified as "Call TI", indicating TI-managed Pb-free plating compatible with standard reflow profiles.
LM236AH-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-206AB, TO-46-3 Metal Can
- Series:
- -
- Packaging:
- Box
- Product Status:
- Obsolete
- 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:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-46-3
LM236AH-2.5/NOPB FAQ
1.How can I place an order for LM236AH-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM236AH-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 LM236AH-2.5/NOPB reliable?
The price and inventory of LM236AH-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 LM236AH-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM236AH-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM236AH-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM236AH-2.5/NOPB?
LM236AH-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM236AH-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 LM236AH-2.5/NOPB?
For technical support, including LM236AH-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM236AH-2.5/NOPB requirements.
6.How does Aetrix verify that LM236AH-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM236AH-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 LM236AH-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM236AH-2.5/NOPB?
All LM236AH-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM236AH-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 LM236AH-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM236AH-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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