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Texas Instruments LM236DR-2-5
- Part No.:
- LM236DR-2-5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM236DR-2-5.pdf
- Description:
- IC VREF SHUNT 2% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,506
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Product details
Overview
LM236DR-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, 5-V-supply-based analog circuitry, and op-amp biasing networks.
For engineers reviewing the LM236DR-2-5 datasheet, LM236DR-2-5 pinout, LM236DR-2-5 application, or LM236DR-2-5 equivalent, key selection criteria include temperature stability across industrial ambient ranges, low dynamic impedance for load regulation, trimmable reference voltage via ADJ terminal, and compatibility with both positive and negative reference configurations.
Technical Context
The LM236DR-2-5 implements a bandgap-derived 2.5-V reference core with internal trimming capability via the ADJ pin, enabling minimization of temperature coefficient. Its three-terminal architecture (ANODE, CATHODE, ADJ) supports external calibration without requiring laser trimming.
It operates as a shunt regulator with specified reverse current range of 400 µA to 10 mA, delivering stable output under varying load conditions. The device exhibits 0.27-Ω dynamic impedance at 1 kHz and 1 mA, and maintains ≤10 mV total voltage variation across full operating current and temperature ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.49 V nominal at 1 mA - enables accurate 2.5-V biasing from 5-V logic rails |
| Initial Tolerance | ±1% at 25°C - ensures predictable system-level accuracy without post-assembly calibration |
| Temp Stability | ≤3.5 mV over −25°C to 85°C - supports industrial-grade measurement stability |
| Dynamic Impedance | 0.27 Ω at 1 mA, 1 kHz - provides tight load regulation in precision feedback loops |
| Operating Current | 400 µA to 10 mA - allows low-power sensor interfaces and high-current reference buffering |
| Long-Term Drift | 20 ppm/khr - ensures multi-year calibration integrity in metering applications |
| Noise Density | 250 nV/√Hz at 10 Hz - suitable for high-resolution ADC reference paths |
Pinout & Package
LM236DR-2-5 uses an 8-pin SOIC (D) package with 1.27-mm lead pitch and 1.75-mm maximum height. Pin 1 is located in quadrant Q1 per tape-and-reel orientation; the package is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 5, 6, 7 | NC | No internal connection - electrically isolated; must be left unconnected or grounded per layout guidelines |
| 4 | Anode | Current sink node for shunt operation - connects to system ground or negative rail in dual-supply designs |
| 8 | Cathode | Reference output node - delivers regulated 2.5 V when current flows into this terminal |
| ADJ (Pin 3) | Adjust | Trim terminal for temperature coefficient optimization - connected to external potentiometer for min-drift calibration |
Key Features
| Feature | Design Value |
|---|---|
| Trimmable temperature coefficient | Enables <10 ppm/°C drift after adjustment - critical for portable instrumentation calibration |
| Low dynamic impedance | 0.27 Ω ensures <0.1% output shift under 1-mA load transients - improves closed-loop stability |
| Wide operating current range | 400 µA–10 mA supports ultra-low-power sensor nodes and high-drive buffer stages |
| Fast turn-on time | Sub-10 µs stabilization - suitable for power-supply sequencing and wake-up reference circuits |
| Bipolar reference capability | Operates as either positive or negative reference - simplifies design in mixed-rail systems |
Applications
| Digital Multimeter Reference | 5-V Logic-Sourced ADC Reference |
|---|---|
Use Scenario: High-accuracy 4½-digit handheld DMM requiring stable 2.5-V reference for 20-V full-scale range. IC Role / Device Role / Timing Role: Primary voltage reference for successive-approximation ADC front-end, directly sourcing comparator bias and DAC reference. Use Value: ±1% initial tolerance and ≤3.5 mV temp drift ensure <0.05% measurement error across −10°C to 50°C operating range. | Use Scenario: Microcontroller-based data logger using 5-V USB supply to power 12-bit SAR ADC. IC Role / Device Role / Timing Role: Shunt reference generating clean 2.5-V reference from noisy 5-V rail, decoupled via RC filter before ADC REF+ input. Use Value: 0.27-Ω dynamic impedance rejects ripple from switching LDO output, maintaining SNR >70 dB. |
| Op-Amp Precision Biasing | Industrial Temperature Sensor Interface |
Use Scenario: Rail-to-rail op-amp configured as precision level-shifter for 0–10 V industrial analog output. IC Role / Device Role / Timing Role: Reference node for resistor-divider network setting common-mode voltage at op-amp non-inverting input. Use Value: Low long-term drift (20 ppm/khr) prevents calibration drift in field-deployed control systems over 5+ years. | Use Scenario: RTD bridge amplifier in programmable logic controller I/O module operating from −25°C to 70°C ambient. IC Role / Device Role / Timing Role: Excitation reference for constant-current source driving 100-Ω Pt100 sensor, with ADJ pin trimmed for minimal thermal EMF. Use Value: Specified −25°C to 85°C operation matches PLC enclosure thermal profile, eliminating cold-junction compensation errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM336DR-2-5 | 0°C to 70°C operating range; same pinout, 2.49 V nominal, ±1% tolerance | Limited to commercial-temperature environments; lower cost for non-industrial use | Select when ambient stays within 0–70°C and long-term drift budget allows 6 mV max temp drift |
| TLVH431IDBVR | Adjustable 1.24–18 V output; 2% initial tolerance; 0.35 Ω dynamic impedance; SOT-23-5 | Requires external resistors for 2.5 V; smaller footprint but higher tolerance and drift | Choose for space-constrained designs where adjustable output and board area savings outweigh precision loss |
Compared with LM236DR-2-5, LM336DR-2-5 trades extended temperature range for lower cost in commercial applications, while TLVH431IDBVR offers footprint reduction and voltage flexibility at the expense of initial accuracy and thermal stability.
Availability
LM236DR-2-5 is available at Aetrix Electronics and suitable for industrial instrumentation, test equipment, and embedded control systems requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM236DR-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 and embedded processing technologies, with decades of expertise in precision reference design and industrial-grade reliability.
The LM236 series belongs to TI's precision shunt voltage reference product line, engineered specifically for applications demanding low temperature drift, high long-term stability, and easy field calibration in harsh thermal environments.
FAQ
What is the operating temperature range of the LM236DR-2-5?
The LM236DR-2-5 is characterized for operation from −25°C to 85°C, making it suitable for industrial environments where ambient temperatures exceed commercial-grade limits. This extended range is confirmed in the SLVS063E datasheet Section "Recommended Operating Conditions" and distinguishes it from the LM336DR-2-5 (0°C to 70°C). The device maintains its ±1% tolerance and ≤3.5 mV temperature drift specification across this full range.
How is the ADJ pin used in the LM236DR-2-5?
The ADJ pin (Pin 3) on the LM236DR-2-5 enables external trimming of the temperature coefficient to minimize drift. As shown in Figure 5 of the SLVS063E datasheet, a potentiometer is connected between ANODE and ADJ to adjust the reference voltage to exactly 2.490 V at 25°C, after which the coefficient is optimized. This pin is not used for voltage setting like in adjustable regulators-it solely calibrates thermal performance.
Can the LM236DR-2-5 be used as a negative voltage reference?
Yes, the LM236DR-2-5 can operate as a negative voltage reference by connecting its ANODE to the system's most negative potential (e.g., −5 V rail) and using the CATHODE as the −2.5 V output node. The device functions as a shunt regulator regardless of polarity, provided reverse current flows through the CATHODE–ANODE path. This bipolar capability is explicitly stated in the "Description" section of the SLVS063E datasheet.
What is the maximum recommended reverse current for continuous operation of the LM236DR-2-5?
The absolute maximum reverse current (IR) for the LM236DR-2-5 is 20 mA, as specified in the "Absolute Maximum Ratings" table of SLVS063E. However, the recommended operating range is 400 µA to 10 mA. Exceeding 10 mA risks increased self-heating and degraded long-term stability; sustained operation above 10 mA should include thermal derating based on θJA = 97°C/W and TJ(max) = 150°C.
Does the LM236DR-2-5 require an external capacitor for stability?
No, the LM236DR-2-5 does not require an external capacitor for basic shunt regulation stability. Its internal design is inherently stable across the full 400 µA–10 mA operating range. However, a 1-µF ceramic capacitor is recommended at the CATHODE node when used in noise-sensitive applications (e.g., high-resolution ADC references) to suppress high-frequency ripple, as implied by typical application schematics in the datasheet's "Application Information" section.
LM236DR-2-5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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
LM236DR-2-5 FAQ
1.How can I place an order for LM236DR-2-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM236DR-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 LM236DR-2-5 reliable?
The price and inventory of LM236DR-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 LM236DR-2-5 is usually 5 days.
3.What payment methods are accepted for LM236DR-2-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM236DR-2-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM236DR-2-5?
LM236DR-2-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM236DR-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 LM236DR-2-5?
For technical support, including LM236DR-2-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM236DR-2-5 requirements.
6.How does Aetrix verify that LM236DR-2-5 is sourced from the original manufacturer or authorized distributors?
All LM236DR-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 LM236DR-2-5 meets industry standards.
7.What is the process for return or replacement of LM236DR-2-5?
All LM236DR-2-5 units undergo pre-shipment inspection (PSI). If there is an issue with LM236DR-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 LM236DR-2-5 part is unused and in its original packaging.
Return procedure for LM236DR-2-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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