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Texas Instruments LM336MX-2.5
- Part No.:
- LM336MX-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM336MX-2.5.pdf
- Description:
- IC VREF SHUNT 4% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,579
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Product details
Overview
LM336MX-2.5 from Texas Instruments (formerly National Semiconductor) is a precision 2.5V shunt voltage reference diode in SO-8 package, operating as a low-temperature-coefficient zener with 0.2Ω dynamic impedance, ±1% initial tolerance, and 0°C to +70°C operating range-used for stable reference generation in 5V-supplied analog front-ends and ADC biasing circuits.
For engineers reviewing the LM336MX-2.5 datasheet, LM336MX-2.5 pinout, LM336MX-2.5 application, or LM336MX-2.5 equivalent, key selection criteria include guaranteed temperature stability over 0°C–70°C, trimmable reference voltage via external potentiometer, low dynamic impedance for noise-sensitive regulation, and compatibility with standard SO-8 PCB footprints and reflow profiles.
Technical Context
The LM336MX-2.5 functions as a two-terminal shunt regulator with an internal bandgap-derived reference core, enabling operation as either positive or negative voltage reference without polarity constraints. Its third terminal (adjust pin) allows independent trimming of output voltage and temperature coefficient-unlike basic zeners-supporting precision calibration in metrology-grade instrumentation.
It delivers stable 2.490V nominal output at 1mA reverse current, with dynamic impedance held to ≤0.2Ω (typ) and long-term stability of 20ppm/1000hrs. The SO-8 package provides improved thermal resistance (θJA = 165°C/W) versus TO-92, supporting higher power dissipation in compact layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.490 V (nominal at 1 mA, trimmed for minimum drift) |
| Initial Tolerance | ±1% (ensures ≤25 mV absolute error at 25°C before trimming) |
| Dynamic Impedance | 0.2 Ω (typ), <1 Ω (max) - suppresses ripple and load-induced voltage shifts |
| Operating Current Range | 400 µA to 10 mA - supports ultra-low-power sensor biasing and high-current reference buffering |
| Temperature Range | 0°C to +70°C - validated for commercial-grade embedded systems and industrial control panels |
| Long-Term Stability | 20 ppm/1000 hrs - ensures reference drift <0.05 mV/year in sealed environments |
| Temp Stability (0–70°C) | 1.8 mV (typ), 6 mV (max) - enables sub-0.1% full-scale accuracy in 12-bit ADC references |
Pinout & Package
LM336MX-2.5 is housed in an 8-pin SOIC (SO-8) package per NS Package Number M08A, with gull-wing leads compatible with standard surface-mount assembly. Thermal resistance is θJA = 165°C/W (JEDEC std.) and θJC not specified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current sink terminal | Connects to system ground or negative rail when used as positive reference; defines current path for shunt regulation |
| Cathode (Pin 2) | Output reference node | Provides regulated 2.5V output; must be decoupled with ≥100 nF ceramic capacitor for stability |
| Adjust (Pin 3) | Trim control input | Accepts external potentiometer to adjust breakdown voltage ±120 mV without altering tempco |
| No Connect (Pins 4–8) | Unused terminals | Internally unconnected; left floating per datasheet-no tie-to-ground or pull-up required |
Key Features
| Feature | Design Value |
|---|---|
| Trim-adjustable reference voltage | Enables post-manufacturing calibration to 2.490V for minimized temperature coefficient (±70 mV trim range) |
| Low dynamic impedance | 0.2Ω typical ensures <0.2 mV output shift under 1 mA load transients-critical for high-resolution DAC buffers |
| Wide operating current range | 400 µA–10 mA accommodates both battery-powered sensors (µA bias) and op-amp reference drivers (mA sourcing) |
| Guaranteed temp stability | ≤6 mV max drift over 0°C–70°C enables use in unheated industrial enclosures without active compensation |
| SO-8 thermal performance | 165°C/W junction-to-ambient allows 300 mW dissipation at 50°C ambient-doubles capability vs. TO-92 |
Applications
| Digital Voltmeter Front-End | 5V-Supplied ADC Reference |
|---|---|
Use Scenario: Precision DC voltage measurement in handheld DVMs powered by dual 9V batteries or USB 5V. IC Role / Device Role / Timing Role: Shunt reference providing stable 2.5V基准 for 16-bit sigma-delta ADC conversion. Use Value: ±1% initial tolerance and <6 mV temp drift ensure ≤0.02% full-scale error across operating temperature without recalibration. | Use Scenario: Reference source for SAR ADCs in PLC analog input modules receiving 5V logic supply. IC Role / Device Role / Timing Role: Low-impedance 2.5V reference tied to ADC REF+ pin, decoupled with 100nF X7R ceramic. Use Value: 0.2Ω dynamic impedance rejects digital switching noise from shared 5V rail, preserving ENOB >11.5 bits. |
| Op-Amp Precision Biasing | Low-Cost Power Supply Trim |
Use Scenario: Setting precise common-mode voltage in rail-to-rail op-amp signal conditioning stages. IC Role / Device Role / Timing Role: Buffered 2.5V reference driving op-amp non-inverting input via unity-gain follower. Use Value: Trim capability allows adjustment to exactly 2.490V, minimizing offset drift contribution in medical ECG amplifiers. | Use Scenario: Adjustable feedback node in 5V buck converter using TL431-compatible topology. IC Role / Device Role / Timing Role: Shunt reference replacing TL431 where lower tempco and trimmability are required. Use Value: External potentiometer on Pin 3 enables fine-tuning of output voltage to ±0.5% without changing feedback resistor network. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDR | 2.495V nominal, 0.2% initial tolerance, no adjust pin, requires minimum 1mA cathode current | Fixed-reference only; lacks trim capability and wider tempco (±50 ppm/°C vs. LM336MX-2.5's ±20 ppm/°C) | Choose when board space is constrained and trim is unnecessary; verify cathode current compliance in low-IQ designs. |
| REF3025AIDBZR | 2.500V nominal, 0.2% initial tolerance, 50 ppm/°C tempco, 50µA quiescent current, SOT-23-3 | Series reference (not shunt); requires input voltage >2.5V + dropout; incompatible topology for crowbar or negative-ref use | Choose for ultra-low-power battery apps where shunt topology is unsuitable; avoid if negative reference or crowbar protection is needed. |
Compared with TL431ACDR and REF3025AIDBZR, the LM336MX-2.2.5 offers unique adjustability and bipolar reference capability but requires external current limiting; it excels in calibration-critical, medium-power commercial systems where SO-8 footprint and proven long-term stability are prioritized.
Availability
LM336MX-2.5 is available at Aetrix Electronics and suitable for digital voltmeters, 5V-supplied ADC reference circuits, op-amp biasing networks, and programmable power supply feedback loops requiring stable component supply and commercial-temperature-grade precision.
Supply support for LM336MX-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 delivering analog, embedded processing, and connectivity solutions, with heritage in precision analog from National Semiconductor's legacy product lines.
The LM336MX-2.5 belongs to TI's precision shunt voltage reference family, designed specifically for commercial-grade instrumentation, test equipment, and industrial control systems requiring calibrated, trimmable 2.5V references without complex support circuitry.
FAQ
What is the exact pin configuration of the LM336MX-2.5 in SO-8 package?
The LM336MX-2.5 uses Pins 1 (Anode), 2 (Cathode), and 3 (Adjust) as functional terminals; Pins 4–8 are No Connect. This matches National Semiconductor's M08A SO-8 mechanical drawing and is verified in SNVS749D Figure 3. Pin 2 delivers the regulated 2.5V output, while Pin 3 accepts an external potentiometer for voltage and tempco trimming. Always decouple Pin 2 to ground with ≥100 nF ceramic capacitance.
Can the LM336MX-2.5 be used as a negative voltage reference?
Yes-the LM336MX-2.5 operates as a bidirectional shunt regulator and can serve as a negative reference by reversing its orientation: connect Pin 1 (Anode) to the negative rail and Pin 2 (Cathode) to the point requiring −2.5V regulation. This is explicitly supported in the "General Description" section of SNVS749D and used in applications like bipolar op-amp biasing and dual-supply ADC references.
What is the maximum power dissipation allowed for LM336MX-2.5 at 70°C ambient?
With θJA = 165°C/W and TJ(MAX) = 100°C (per Note 2), the LM336MX-2.5 supports up to 182 mW at 70°C ambient (PD = (100 − 70)/165 ≈ 0.182 W). At 10 mA operating current and 2.5V drop, power dissipation is 25 mW-well within safe margin. Derating is not required below 70°C ambient per datasheet limits.
Does the LM336MX-2.5 require an external current-limiting resistor, and how is its value calculated?
Yes-LM336MX-2.5 is a shunt device and requires an external series resistor (RS) between supply and Cathode (Pin 2). RS must ensure minimum 400 µA and maximum 10 mA through the device. For a 5V supply: RS(MIN) = (5 − 2.5)/0.01 = 250 Ω; RS(MAX) = (5 − 2.5)/0.0004 = 6.25 kΩ. Standard 1 kΩ or 4.7 kΩ resistors are commonly selected for robustness and noise immunity.
How does the adjust pin (Pin 3) affect temperature coefficient in the LM336MX-2.5?
Pin 3 enables independent optimization: adjusting the LM336MX-2.5 to exactly 2.490V minimizes temperature coefficient per Figure 2 in SNVS749D. This trim does not alter the intrinsic tempco curve-it shifts the operating point to the inflection where drift is lowest. The datasheet guarantees ≤6 mV total drift (0°C–70°C) after such adjustment, making it ideal for applications demanding <0.025% reference stability.
LM336MX-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:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.49V
- Voltage - Output (Max):
- -
- Current - Output:
- 10 mA
- Tolerance:
- ±4%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 400 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM336MX-2.5 FAQ
1.How can I place an order for LM336MX-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM336MX-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 LM336MX-2.5 reliable?
The price and inventory of LM336MX-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 LM336MX-2.5 is usually 5 days.
3.What payment methods are accepted for LM336MX-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM336MX-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM336MX-2.5?
LM336MX-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM336MX-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 LM336MX-2.5?
For technical support, including LM336MX-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM336MX-2.5 requirements.
6.How does Aetrix verify that LM336MX-2.5 is sourced from the original manufacturer or authorized distributors?
All LM336MX-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 LM336MX-2.5 meets industry standards.
7.What is the process for return or replacement of LM336MX-2.5?
All LM336MX-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM336MX-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 LM336MX-2.5 part is unused and in its original packaging.
Return procedure for LM336MX-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM336MX-2.5 Tags
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