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Texas Instruments LM336MX-2.5/NOPB
- Part No.:
- LM336MX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM336MX-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 4% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,780
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Product details
Overview
LM336MX-2.5/NOPB from Texas Instruments is a precision 2.5V shunt voltage reference diode in SOIC-8 package, operating as a low-temperature-coefficient zener with 0.2Ω dynamic impedance, ±1% initial tolerance, and guaranteed stability over 0°C to +70°C - used in digital voltmeters, 5V-supply-referenced op-amp circuits, and power supply feedback paths.
For engineers reviewing the LM336MX-2.5/NOPB datasheet, LM336MX-2.5/NOPB pinout, LM336MX-2.5/NOPB application, or LM336MX-2.5/NOPB equivalent, this page delivers verified electrical specs, thermal behavior, trimming capability, package dimensions, and real-world reference circuit integration guidance - all specific to the LM336MX-2.5/NOPB variant.
Technical Context
The LM336MX-2.5/NOPB functions as a two-terminal shunt reference with third-terminal trim capability, enabling precise adjustment of both breakdown voltage and temperature coefficient. Its monolithic IC structure provides stable 2.5V regulation across 400 µA–10 mA operating current without external biasing complexity.
Unlike discrete zeners, it integrates low dynamic impedance (0.2 Ω typ.) and guaranteed temperature stability (≤6 mV over 0°C to +70°C), supporting high-accuracy analog signal conditioning and closed-loop regulation where long-term drift and load-induced error must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.490 V (typical, trimmed), 2.390–2.590 V (min/max at 1 mA, 25°C) |
| Initial Tolerance | ±1% (LM336B grade), enabling direct use in 12-bit ADC references without calibration |
| Dynamic Impedance | 0.2 Ω (typical at 1 mA, 100 Hz), minimizing output voltage shift under load transients |
| Operating Current Range | 400 µA to 10 mA, allowing compatibility with low-power microcontrollers and high-current op-amp buffers |
| Temperature Stability | ≤6 mV over 0°C to +70°C (guaranteed design limit), ensuring <±25 ppm/°C effective TC |
| Long-Term Stability | 20 ppm (1000 hrs at 25°C), critical for metrology-grade instrumentation requiring recalibration intervals >1 year |
Pinout & Package
LM336MX-2.5/NOPB uses an 8-pin SOIC (SO-8) package per NS Package Number M08A, with pins 1–8 arranged in dual-in-line configuration. Pin 1 is marked via notch or dot; device operates as a 3-terminal shunt reference requiring Cathode (pin 2), Anode (pin 3), and Adjust (pin 1) connections.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (ADJ) | Trim terminal | Enables external potentiometer connection to adjust reference voltage and minimize temperature coefficient independently |
| Pin 2 (CATH) | Cathode | Main current sink node; connects to regulated output node or feedback point in shunt regulator topology |
| Pin 3 (ANODE) | Anode | Ground or low-impedance return path; defines reference potential relative to cathode |
| Pins 4–8 | No connect (NC) | Internally unconnected; no routing or grounding required - electrically isolated per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reference voltage | Trim range ±120 mV typical via external potentiometer on ADJ pin, correcting for initial tolerance and buffer errors |
| Low-TC temperature compensation | Adjustment to 2.490 V minimizes TC using two series silicon diodes (e.g., 1N4148) thermally coupled to device |
| Wide current compliance | Stable regulation from 400 µA (battery-powered sensors) up to 10 mA (op-amp driver loads) without performance degradation |
| Fast turn-on response | Sub-microsecond stabilization enables use in switched-mode power supply feedback loops with high-frequency PWM |
Applications
| Digital Voltmeter Reference | 5V Logic-Supply Referenced Op-Amp |
|---|---|
Use Scenario: High-resolution benchtop DVM measuring 0–20 V full-scale with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Precision 2.5V shunt reference providing stable scale factor for ADC conversion. Use Value: ±1% initial tolerance and ≤6 mV temp drift over 0°C–70°C ensure <0.02% measurement error without factory calibration. |
Use Scenario: Rail-to-rail op-amp buffer generating accurate 2.5V offset from noisy 5V logic rail in mixed-signal PCB. IC Role / Device Role / Timing Role: Low-impedance shunt reference decoupling 5V supply noise while maintaining DC accuracy. Use Value: 0.2 Ω dynamic impedance rejects supply ripple better than discrete zener + capacitor solutions, reducing layout sensitivity. |
| Switching Regulator Feedback | Linear Ohmmeter Calibration |
Use Scenario: 2A buck converter with TL431-like feedback but requiring lower quiescent current and tighter TC. IC Role / Device Role / Timing Role: Shunt reference replacing TL431 in optocoupler-isolated feedback path. Use Value: 400 µA min operating current reduces standby loss; adjustable TC supports wide ambient temperature operation. |
Use Scenario: Portable handheld ohmmeter applying constant test current to unknown resistor and measuring voltage drop. IC Role / Device Role / Timing Role: Stable 2.5V reference defining test current magnitude via precision sense resistor. Use Value: 20 ppm long-term stability ensures calibration remains valid for >12 months between field adjustments. |
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 | Programmable 2.495V reference; requires external resistors for 2.5V setting; higher 0.22Ω dynamic impedance; wider temp range (−40°C to +125°C) | Used in isolated SMPS feedback where adjustable threshold is needed; lacks dedicated ADJ pin for TC trimming | Select when programmability and extended temperature range outweigh need for factory-trimmable TC |
| REF3025AIDBZR | 2.5V series reference; 3.6V to 5.5V supply required; 50 ppm/°C max TC; 50 µA quiescent current; fixed output, no trim | Suitable for low-power sensor nodes where supply headroom allows series topology and TC spec is relaxed | Select when ultra-low IQ and SOT-23 footprint are prioritized over shunt flexibility and TC optimization |
Compared with TL431ACDR and REF3025AIDBZR, the LM336MX-2.5/NOPB uniquely supports independent voltage and temperature coefficient trimming via its ADJ pin - essential for metrology-grade systems where long-term drift must be actively minimized, not just specified.
Availability
LM336MX-2.5/NOPB is available at Aetrix Electronics and suitable for digital voltmeters, 5V-referenced op-amp circuits, and switching regulator feedback networks requiring stable component supply, RoHS-compliant packaging, and traceable sourcing for industrial OEM programs.
Supply support for LM336MX-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 company delivering analog and embedded processing solutions, with leadership in precision analog, power management, and signal chain technologies since 1930.
The LM336MX-2.5/NOPB belongs to TI's legacy precision shunt reference family, designed specifically for applications demanding low-drift, trimmable 2.5V references in cost-sensitive industrial and test equipment - not general-purpose zener replacement.
FAQ
What is the operating temperature range for LM336MX-2.5/NOPB?
The LM336MX-2.5/NOPB is rated for operation from 0°C to +70°C, matching the LM336 grade specification. This range is validated per Electrical Characteristics table in SNVS749D, and thermal derating is not required within this envelope. The SOIC-8 package has θJA = 165°C/W, supporting reliable operation at full current under typical PCB layouts.
Does LM336MX-2.5/NOPB require external components to function as a 2.5V reference?
Yes - the LM336MX-2.5/NOPB requires at minimum a current-setting resistor from cathode to supply rail to establish operating current (400 µA–10 mA). For basic operation, no trim components are needed; however, the ADJ pin (pin 1) enables optional external potentiometer for voltage/TC adjustment. Pins 4–8 are NC and must remain unconnected.
How does the trim capability of LM336MX-2.5/NOPB differ from standard zener diodes?
Unlike passive zeners, the LM336MX-2.5/NOPB integrates a dedicated ADJ pin (pin 1) that allows separate tuning of reference voltage and temperature coefficient. Figure 2 in SNVS749D shows how adding two series diodes to the ADJ path minimizes TC when adjusted to 2.490 V - a capability absent in discrete zeners and most other shunt references.
Is LM336MX-2.5/NOPB pin-compatible with LM336Z-2.5 or LM336M-2.5?
No - LM336MX-2.5/NOPB (SOIC-8) is not pin-compatible with LM336Z-2.5 (TO-92, 3-pin) or LM336M-2.5 (SOIC-8 but non-NOPB, different suffix). While both SO variants share pin 1 (ADJ), pin 2 (CATH), and pin 3 (ANODE), the /NOPB suffix confirms lead-free, RoHS-compliant processing and TI's current datasheet revision - critical for production traceability.
What is the maximum reverse current rating for LM336MX-2.5/NOPB?
The absolute maximum reverse current for LM336MX-2.5/NOPB is 15 mA, per Absolute Maximum Ratings in SNVS749D. Continuous operation above 10 mA is not recommended, as electrical characteristics (e.g., dynamic impedance, TC) are only specified up to 10 mA. Exceeding 15 mA risks permanent damage.
LM336MX-2.5/NOPB 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:
- ±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/NOPB FAQ
1.How can I place an order for LM336MX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM336MX-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 LM336MX-2.5/NOPB reliable?
The price and inventory of LM336MX-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 LM336MX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM336MX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM336MX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM336MX-2.5/NOPB?
LM336MX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM336MX-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 LM336MX-2.5/NOPB?
For technical support, including LM336MX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM336MX-2.5/NOPB requirements.
6.How does Aetrix verify that LM336MX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM336MX-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 LM336MX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM336MX-2.5/NOPB?
All LM336MX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM336MX-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 LM336MX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM336MX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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