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Texas Instruments LM236D-2-5
- Part No.:
- LM236D-2-5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM236D-2-5.pdf
- Description:
- IC VREF SHUNT 2% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:298
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Product details
Overview
LM236D-2-5 from Texas Instruments is a precision 2.5-V shunt voltage reference IC in an 8-pin SOIC package, characterized for operation from −25°C to 85°C, with ±1% initial tolerance, 0.27-Ω dynamic impedance at 1 mA, and 3.5 mV max temperature drift over full range. It serves as a stable low-voltage reference in digital voltmeters, power supply feedback loops, and op-amp biasing circuits.
For engineers reviewing the LM236D-2-5 datasheet, LM236D-2-5 pinout, LM236D-2-5 application, or LM236D-2-5 equivalent, key selection criteria include its extended industrial temperature range, trimmable ADJ terminal for minimizing temperature coefficient, low 400 µA minimum operating current, and compatibility with 5-V logic supply rails.
Technical Context
The LM236D-2-5 implements a bandgap-derived 2.5-V reference core with an external adjustment terminal (ADJ) enabling fine-tuning of output voltage and temperature coefficient. Its internal circuitry includes precision resistive dividers and bipolar transistor-based error amplification to maintain stability across load and temperature variations.
As a shunt regulator, it operates by sinking current through its cathode-anode path to hold 2.5 V across an external load; the ADJ pin connects to an internal resistor divider node, allowing external trimming resistors to correct for initial offset and thermal drift without altering basic topology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.49 V nominal at 1 mA - defines precise DC bias point for ADC references or feedback networks |
| Initial Tolerance | ±1% at 25°C - ensures ≤25 mV absolute error before trimming |
| Temp Stability | ≤3.5 mV over −25°C to 85°C - enables <100 ppm/°C effective TC after calibration |
| Dynamic Impedance | 0.27 Ω at 1 mA - minimizes load-induced voltage shift under dynamic current changes |
| Operating Current | 400 µA to 10 mA - supports ultra-low-power sensor interfaces and high-current regulation |
| Long-Term Drift | 20 ppm/khr - guarantees <0.05% output change over 5 years in typical use |
| Package | SOIC-8 - surface-mount compatible with standard reflow profiles and automated assembly |
Pinout & Package
LM236D-2-5 uses an 8-pin SOIC (D) package with 1.27 mm pitch, 3.94 mm width, and 1.75 mm max height per JEDEC MS-012 variation AA. Pin 1 is located at top-left corner with notch or beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 5, 6, 7 | No internal connection | Unused pins; must remain unconnected or grounded per layout guidelines |
| 4 | Anode | Low-side return path; connects to system ground or negative rail |
| 8 | Cathode | Output node; sinks current to maintain 2.5 V across external load |
| NC (Pin 8) | Adjust | Internal divider tap; connects to external potentiometer for temp-coefficient trimming |
Key Features
| Feature | Design Value |
|---|---|
| Trimmed temperature coefficient | Enables <10 ppm/°C performance via external resistor network on ADJ pin |
| Low 400 µA start-up current | Allows operation in battery-powered systems where quiescent current is critical |
| 0.27 Ω dynamic impedance | Reduces output voltage perturbation during transient load steps in precision analog stages |
| −25°C to 85°C operating range | Supports industrial environments where commercial-grade references (0°C–70°C) fail |
| Fast turn-on response | Stabilizes within microseconds-suitable for power-supply sequencing and wake-up circuits |
Applications
| Digital Multimeter Reference | Isolated Power Supply Feedback |
|---|---|
Use Scenario: High-resolution 4½-digit DMM requiring stable 2.5-V reference for ADC conversion and auto-zero calibration. IC Role / Device Role / Timing Role: Shunt voltage reference providing primary scaling voltage for successive-approximation ADC and offset nulling amplifier. Use Value: ±1% initial tolerance and ≤3.5 mV temp drift ensure <0.1% measurement accuracy across lab temperature ranges without recalibration. | Use Scenario: Flyback converter with optocoupler feedback where secondary-side reference must survive wide ambient swings. IC Role / Device Role / Timing Role: Precision shunt reference establishing regulated 2.5-V threshold for TL431-compatible optocoupler driver circuit. Use Value: −25°C to 85°C rating and 0.27-Ω impedance maintain loop stability and output regulation accuracy under thermal stress. |
| Portable Data Logger Bias | Industrial PLC Analog Input Module |
Use Scenario: Battery-operated environmental sensor node sampling temperature/humidity with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Low-current shunt reference supplying clean 2.5-V reference to ADC and signal-conditioning op-amps. Use Value: 400 µA min operating current enables >1-year battery life using CR2032 while maintaining 2.5-V accuracy. | Use Scenario: DIN-rail mounted PLC module converting 4–20 mA field signals to digital values in factory-floor environments. IC Role / Device Role / Timing Role: Primary voltage reference for programmable gain instrumentation amplifier and sigma-delta ADC front-end. Use Value: Trimmed ADJ pin allows factory calibration to compensate for PCB-level thermal gradients and long-term drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM336D-2-5 | Same SOIC-8 package and pinout; rated 0°C to 70°C only; no guaranteed −25°C performance | Suitable for commercial-grade equipment but not extended-temperature industrial deployments | Select when cost sensitivity outweighs need for sub-zero operation |
| TL431ACDR | Adjustable 2.495 V reference; higher 0.2 Ω typical impedance; requires external resistors for 2.5 V setting | Used where programmability or tighter initial tolerance (±0.5%) is prioritized over fixed 2.5 V simplicity | Choose when design flexibility justifies added component count and calibration complexity |
Compared with LM336D-2-5 and TL431ACDR, the LM236D-2-5 uniquely delivers guaranteed −25°C functionality in a fixed 2.5-V configuration with trimmable temperature coefficient-making it optimal for ruggedized instrumentation where cold-start reliability and long-term stability are non-negotiable.
Availability
LM236D-2-5 is available at Aetrix Electronics and suitable for digital multimeters, isolated power supplies, portable data loggers, and industrial PLC analog input modules requiring stable component supply across extended temperature ranges.
Supply support for LM236D-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, delivering analog and embedded processing solutions since 1930.
The LM236 series belongs to TI's precision voltage reference product line, engineered specifically for applications demanding stable, low-drift, trimmable shunt references in industrial and test equipment environments.
FAQ
What is the operating temperature range of the LM236D-2-5?
The LM236D-2-5 is characterized for operation from −25°C to 85°C. This extended industrial temperature range distinguishes it from the LM336D-2-5 (0°C to 70°C) and makes the LM236D-2-5 suitable for outdoor, automotive under-hood, or factory-floor applications where ambient extremes occur. The datasheet specifies all electrical parameters-including reference voltage, temperature drift, and dynamic impedance-over this full range.
How does the ADJ pin on the LM236D-2-5 function?
The ADJ pin on the LM236D-2-5 provides access to an internal resistor divider node, enabling external trimming of both output voltage and temperature coefficient. By connecting a potentiometer between cathode and anode-with wiper to ADJ-the LM236D-2-5 can be calibrated to 2.490 V at 25°C and minimized drift over temperature. This feature is absent in non-adjustable references like the TL431 and is central to achieving <10 ppm/°C performance in production calibration.
Can the LM236D-2-5 be used as a negative voltage reference?
Yes, the LM236D-2-5 can be configured as a negative voltage reference by reversing its polarity: connect the cathode to system ground and the anode to a negative rail, then take the reference from the anode relative to ground. In this mode, it regulates −2.5 V with identical specifications-dynamic impedance, temperature stability, and current range-as in positive-reference operation. The SOIC-8 package supports either orientation without modification.
What is the minimum operating current required for the LM236D-2-5 to regulate accurately?
The LM236D-2-5 requires a minimum cathode current of 400 µA to maintain regulation within specification. Below this threshold, output voltage deviates significantly-up to 6 mV at 25°C per the ∆VZ(∆I) parameter. For ultra-low-power designs, this value sets the lower bound for series resistor selection when powered from a 5-V rail: R ≤ (5 V − 2.5 V) / 400 µA = 6.25 kΩ. Operation below 400 µA is possible but sacrifices guaranteed accuracy.
Is the LM236D-2-5 RoHS compliant and what is its moisture sensitivity level?
Yes, the LM236D-2-5 is RoHS compliant with NiPdAu (NIPDAU) lead finish and carries a JEDEC MSL Level-1 rating with unlimited floor life at ≤30°C/85% RH. Its SOIC-8 package is qualified for peak reflow temperatures up to 260°C, making it compatible with standard lead-free soldering processes. The device marking "236-25" and tape-and-reel packaging (2500 per reel) align with TI's production release status as of July 2026.
LM236D-2-5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM236D-2-5 FAQ
1.How can I place an order for LM236D-2-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM236D-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 LM236D-2-5 reliable?
The price and inventory of LM236D-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 LM236D-2-5 is usually 5 days.
3.What payment methods are accepted for LM236D-2-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM236D-2-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM236D-2-5?
LM236D-2-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM236D-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 LM236D-2-5?
For technical support, including LM236D-2-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM236D-2-5 requirements.
6.How does Aetrix verify that LM236D-2-5 is sourced from the original manufacturer or authorized distributors?
All LM236D-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 LM236D-2-5 meets industry standards.
7.What is the process for return or replacement of LM236D-2-5?
All LM236D-2-5 units undergo pre-shipment inspection (PSI). If there is an issue with LM236D-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 LM236D-2-5 part is unused and in its original packaging.
Return procedure for LM236D-2-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM236D-2-5 Tags
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