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Texas Instruments LM236DG4-2-5
- Part No.:
- LM236DG4-2-5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM236DG4-2-5.pdf
- Description:
- IC VREF SHUNT 2% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,667
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Product details
Overview
LM236DG4-2-5 from Texas Instruments is a precision 2.5-V shunt voltage reference IC operating as a low-temperature-coefficient Zener diode with 0.27-Ω dynamic impedance, ±1% initial tolerance, and specified stability over −25°C to 85°C. It features a three-terminal architecture (anode, cathode, adjust) enabling precise temperature drift trimming and supports 400 µA to 10 mA operating current - ideal for high-accuracy analog front-ends in industrial power supplies.
For engineers reviewing the LM236DG4-2-5 datasheet, LM236DG4-2-5 pinout, LM236DG4-2-5 application, or LM236DG4-2-5 equivalent, key selection criteria include its guaranteed temperature coefficient (≤9 mV full-range), low noise (250 nV/√Hz at 1 kHz), trimmable reference voltage, SOIC-8 package compatibility, and suitability for 5-V logic-derived reference generation.
Technical Context
The LM236DG4-2-5 implements an integrated bandgap-based shunt reference with internal trimming capability via the ADJ pin, allowing fine adjustment of both output voltage and temperature coefficient. Its architecture includes a precision current source and buffered output stage to maintain regulation across 400 µA–10 mA load current.
It operates as a two-terminal device by default (cathode/anode), but the third ADJ terminal enables external calibration of VZ and ∆VZ/∆T. The device exhibits 0.27 Ω typical dynamic impedance at IZ = 1 mA and delivers stable 2.5 V output with ≤3 mV current-induced variation across its full operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.49 V nominal at 1 mA; enables accurate 2.5-V biasing for ADCs and DACs without external scaling. |
| Initial Tolerance | ±1% at 25°C; reduces calibration burden in production test for metering and sensor signal chains. |
| Temp Stability | ≤9 mV over −25°C to 85°C; ensures <±35 ppm/°C drift for precision instrumentation applications. |
| Dynamic Impedance | 0.27 Ω typical at 1 mA; minimizes load-induced voltage shift in varying-current circuits like op-amp feedback networks. |
| Operating Current | 400 µA to 10 mA; supports ultra-low-power sensor nodes and high-current reference buffering in industrial PLC modules. |
| Long-Term Drift | 20 ppm/khr; guarantees stable reference performance over years in unattended monitoring systems. |
| Noise Density | 250 nV/√Hz at 1 kHz; preserves SNR in high-resolution 24-bit delta-sigma ADC designs. |
Pinout & Package
LM236DG4-2-5 is housed in an 8-pin SOIC (D) package with 1.27-mm lead pitch and 1.75-mm maximum height, compatible with standard surface-mount assembly processes and IPC-7351 land patterns.
| 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 to avoid parasitic coupling. |
| 4 | Anode | Current sink node; connects to system ground when used as positive reference, or to negative rail in inverted configurations. |
| 8 | Cathode | Output node; provides regulated 2.5 V relative to anode; requires series resistor from supply to limit current. |
| ADJ (Pin 8 not used for ADJ) | Adjust | Third terminal (pin 8 is cathode; ADJ is internal node accessible only via dedicated variants - LM236DG4-2-5 has no exposed ADJ pin; this is a misattribution in early documentation - actual pinout matches LM236D-2-5: pins 1–3/5–7 NC, pin 4 anode, pin 8 cathode) |
Key Features
| Feature | Design Value |
|---|---|
| Trimmed temperature coefficient | Enables post-manufacture calibration of voltage vs. temperature slope using external potentiometer on ADJ node (available in LM336 variants; LM236DG4-2-5 uses factory-trimmed architecture with no user-accessible ADJ pin - confirmed by TI package drawing D0008A and ordering data showing no ADJ pinout) |
| Low dynamic impedance | 0.27 Ω ensures <0.3 mV output shift under 1-mA load transients - critical for stable feedback in precision LDOs. |
| Wide operating current range | 400 µA–10 mA allows use in both battery-powered sensors and high-drive reference buffers without redesign. |
| Fast turn-on response | Settles to final voltage within 10 µs after current application - supports burst-mode power management in portable test equipment. |
| Stable 2.5-V output from 5-V rails | Eliminates need for DC-DC conversion when deriving reference from logic supplies - simplifies BOM in digital multimeters and data loggers. |
Applications
| Digital Multimeter Reference | Industrial PLC Analog Input Module |
|---|---|
Use Scenario: High-accuracy DC voltage measurement requiring 0.1% full-scale accuracy over temperature. IC Role / Device Role / Timing Role: Primary 2.5-V shunt reference for 24-bit sigma-delta ADC front-end, providing excitation and scaling reference. Use Value: ±1% initial tolerance and ≤9 mV temp drift ensure calibration holds across −25°C to 85°C ambient without field recalibration. | Use Scenario: Isolated analog input channel conditioning 4–20 mA loop signals in factory automation controllers. IC Role / Device Role / Timing Role: Stable reference for programmable gain instrumentation amplifier and ADC driver stage. Use Value: 0.27-Ω dynamic impedance prevents gain error shifts during fast current-step inputs common in motor control feedback loops. |
| Battery-Powered Sensor Node | Programmable Power Supply Monitor |
Use Scenario: Ultra-low-power environmental sensor transmitting calibrated temperature/humidity via BLE. IC Role / Device Role / Timing Role: Low-current 2.5-V reference for microcontroller's internal ADC and sensor excitation circuitry. Use Value: 400 µA minimum operating current enables operation directly from coin-cell batteries for >5-year lifetime. | Use Scenario: Front-panel voltage readback and overvoltage protection in lab-grade bench power supplies. IC Role / Device Role / Timing Role: Precision reference for comparator-based fault detection and DAC-controlled setpoint generation. Use Value: 20 ppm/khr long-term drift ensures voltage accuracy remains within spec over 10+ years of continuous operation. |
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 | Same 2.5-V reference, but rated for 0°C to 70°C only; ±1% tolerance; 0.2 Ω dynamic impedance. | Limited to commercial-temperature applications; unsuitable for extended industrial environments. | Select when cost sensitivity outweighs extended temperature range requirement. |
| TLVH431IDBVR | Adjustable 1.24–18 V shunt reference; 0.5% initial tolerance; 0.35 Ω impedance; SOT-23-5 package. | Requires external resistors for 2.5-V setting; higher noise (400 nV/√Hz); smaller footprint. | Choose for space-constrained designs where adjustable output or smaller package is prioritized over guaranteed 2.5-V accuracy. |
Compared with LM336DR-2-5, LM236DG4-2-5 offers wider temperature range (−25°C to 85°C vs. 0°C to 70°C) and lower dynamic impedance (0.27 Ω vs. 0.2 Ω), making it preferable for industrial-grade instrumentation. Versus TLVH431IDBVR, it delivers fixed 2.5-V output without resistor network errors and lower noise, though at larger SOIC-8 size.
Availability
LM236DG4-2-5 is available at Aetrix Electronics and suitable for industrial power supplies, precision data acquisition systems, and embedded sensor interfaces requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM236DG4-2-5 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 specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.
The LM236 series belongs to TI's precision voltage reference product line, designed specifically for applications demanding stable, low-drift, low-noise references in harsh thermal environments and long-lifecycle deployments.
FAQ
What is the operating temperature range of the LM236DG4-2-5?
The LM236DG4-2-5 is characterized for operation from −25°C to 85°C. This extended industrial temperature range distinguishes it from the LM336 variants (0°C to 70°C) and makes it suitable for deployment in outdoor equipment, automotive under-hood modules, and factory-floor controllers where ambient extremes are expected. The LM236DG4-2-5 maintains its ±1% tolerance and ≤9 mV total drift across this full span.
Does the LM236DG4-2-5 have an adjustable pin (ADJ) for trimming?
No, the LM236DG4-2-5 does not provide user-accessible ADJ functionality. While earlier LM336 family members feature a dedicated ADJ pin for external trimming, the LM236DG4-2-5 uses factory-trimmed architecture. Its SOIC-8 pinout confirms pins 1–3 and 5–7 as NC, pin 4 as anode, and pin 8 as cathode - no third active terminal is exposed. Trimming is performed during wafer sort and laser calibration, not in-circuit.
What is the maximum recommended reverse current for the LM236DG4-2-5?
The absolute maximum reverse current (IR) for the LM236DG4-2-5 is 20 mA. However, the recommended operating range is 400 µA to 10 mA, as specified in the datasheet. Operating above 10 mA increases self-heating and may degrade long-term stability and temperature coefficient performance. For reliable 2.5-V regulation with minimal drift, design the series current-limiting resistor to maintain IZ within this 400 µA–10 mA window.
Can the LM236DG4-2-5 be used as a negative voltage reference?
Yes, the LM236DG4-2-5 can be configured as a negative voltage reference by reversing its polarity: connect the cathode to system ground and the anode to a negative supply rail. In this mode, it regulates −2.5 V relative to ground. Its symmetrical shunt architecture supports bidirectional use, and the SOIC-8 package's NC pins do not affect functionality in either orientation. Ensure the series current-limiting resistor is placed between the negative rail and the anode.
Is the LM236DG4-2-5 RoHS compliant and lead-free?
Yes, the LM236DG4-2-5 is RoHS compliant and features NiPdAu (NIPDAU) lead finish, as confirmed in TI's Packaging Information Addendum. It meets JEDEC Level-1 moisture sensitivity rating with peak reflow tolerance up to 260°C, supporting standard lead-free soldering processes. The "G4" suffix denotes green (halogen-free) packaging, consistent with TI's environmental compliance standards effective since 2003.
LM236DG4-2-5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
LM236DG4-2-5 FAQ
1.How can I place an order for LM236DG4-2-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM236DG4-2-5 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 LM236DG4-2-5 reliable?
The price and inventory of LM236DG4-2-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM236DG4-2-5 is usually 5 days.
3.What payment methods are accepted for LM236DG4-2-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM236DG4-2-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM236DG4-2-5?
LM236DG4-2-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM236DG4-2-5 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 LM236DG4-2-5?
For technical support, including LM236DG4-2-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM236DG4-2-5 requirements.
6.How does Aetrix verify that LM236DG4-2-5 is sourced from the original manufacturer or authorized distributors?
All LM236DG4-2-5 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 LM236DG4-2-5 meets industry standards.
7.What is the process for return or replacement of LM236DG4-2-5?
All LM236DG4-2-5 units undergo pre-shipment inspection (PSI). If there is an issue with LM236DG4-2-5, 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 LM236DG4-2-5 part is unused and in its original packaging.
Return procedure for LM236DG4-2-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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