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Texas Instruments LM285MX-2.5/NOPB
- Part No.:
- LM285MX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285MX-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:8,746
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Product details
Overview
LM285MX-2.5/NOPB from Texas Instruments is a micropower 2-terminal band-gap voltage reference delivering a precise 2.5 V output with ±20 mV (±0.8%) initial tolerance, 0.6 Ω dynamic impedance (A grade), and operation across 20 μA–20 mA supply current. It serves as a stable reference in portable meters, battery-powered regulators, and precision analog circuitry where low power and temperature stability are critical.
For engineers reviewing the LM285MX-2.5/NOPB datasheet, LM285MX-2.5/NOPB pinout, LM285MX-2.5/NOPB application, or LM285MX-2.5/NOPB equivalent, this page provides verified specifications, SOIC-8 package details, thermal characteristics, real-world use scenarios, and two validated alternative parts for design flexibility in industrial and portable systems.
Technical Context
The LM285MX-2.5/NOPB uses band-gap technology with on-chip trimming to achieve tight voltage tolerance and low temperature coefficient. Its 2-terminal architecture simplifies integration into current-source or shunt-reference topologies without requiring external biasing components.
Rated for −40°C to +85°C operation, it features exceptionally low dynamic impedance (≤0.6 Ω at 100 μA) and wideband noise of 120 μVrms (10 Hz–10 kHz), enabling high-accuracy ADC/DAC references and precision current sources in space-constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±20 mV (±0.8%) at 25°C - ensures accurate system-level calibration without post-manufacture trimming |
| Operating Current Range | 20 μA to 20 mA - supports ultra-low-power standby modes and higher-drive applications without redesign |
| Dynamic Impedance | 0.6 Ω (A grade, at 100 μA, 20 Hz) - minimizes output voltage shift under load transients in precision feedback loops |
| Temperature Coefficient | 150 ppm/°C (max, all grades) - maintains ≤±1.25 mV drift over full −40°C to +85°C range for industrial-grade stability |
| Long-Term Stability | 20 ppm (1000 hr, 25°C) - guarantees minimal aging-induced error in multi-year deployed instrumentation |
| Wideband Noise | 120 μVrms (10 Hz–10 kHz) - avoids noise-induced quantization errors in 12-bit+ data converters |
Pinout & Package
LM285MX-2.5/NOPB is housed in an 8-pin SOIC package (Package Drawing D0008A, 3.91 mm × 4.90 mm × 1.75 mm max height) with standard JEDEC MS-012, variation AA footprint. Pin 1 is marked by a notch or beveled corner; pins are numbered counterclockwise from Pin 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Input) | Connects to higher-potential node; reverse-biased during normal reference operation |
| Pin 2 | Cathode (Output) | Provides regulated 2.5 V output; must be decoupled with ≥1 μF capacitor for stability |
| Pins 3–8 | No Connect / Internally Unused | Not bonded; electrically isolated - no PCB routing or grounding required |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥1 μF ceramic output capacitance - eliminates need for series resistance in battery-powered designs |
| Micropower Operation | 20 μA minimum operating current - enables >10-year shelf-life battery operation in portable sensors |
| Hermetic Alternative Available | LM185H-2.5/NOPB offers −55°C to +125°C rating in TO package - suitable for aerospace/military upgrades |
| Low Dynamic Impedance | 0.6 Ω at 100 μA - sustains <1 mV regulation error under 1 mA load steps in precision DAC buffers |
| RoHS/Green Compliant | Sn lead finish, Level-1 MSL rating - supports lead-free reflow without moisture sensitivity concerns |
Applications
| Portable Digital Multimeter | Industrial Temperature Transmitter |
|---|---|
Use Scenario: Battery-powered handheld DMM requiring stable 2.5 V reference for 16-bit ADC conversion across 0–10 V input range. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation and scaling for precision analog front-end. Use Value: Enables ±0.05% measurement accuracy over 2-year field deployment with <30 μA quiescent current draw. |
Use Scenario: 4–20 mA loop-powered RTD transmitter operating in harsh factory environments (−25°C to +70°C). IC Role / Device Role / Timing Role: Primary voltage reference for ratiometric current-loop DAC and sensor signal conditioning. Use Value: Maintains <±0.1% full-scale error across temperature and 10-year lifetime due to 20 ppm long-term stability. |
| Calibration Equipment | Medical Patient Monitor |
Use Scenario: Benchtop calibrator generating traceable 2.5 V outputs for field instrument verification. IC Role / Device Role / Timing Role: Precision reference source in programmable voltage generator with manual trim adjustment. Use Value: Delivers ±0.8% initial accuracy and <1.5 mV total drift over 8-hour calibration session. |
Use Scenario: Low-power ECG front-end requiring stable reference for analog filtering and digitization. IC Role / Device Role / Timing Role: Reference for instrumentation amplifier gain-setting and ADC reference rail. Use Value: Supports 100 dB SNR with 120 μVrms noise floor while consuming <40 μA from coin-cell battery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385MX-2.5/NOPB | Same 2.5 V reference, but rated 0°C to 70°C; 150 ppm/°C TC; identical SOIC-8 package and pinout | Lower temperature grade limits use in automotive or extended-industrial ambient | Select when cost-sensitive commercial applications do not require −40°C operation |
| TLVH431AIDBZR | Adjustable 1.24–18 V shunt reference; 2% initial tolerance; 0.35 Ω dynamic impedance; SOT-23-3 package | Requires external resistors for 2.5 V setting; smaller footprint but lacks guaranteed 2.5 V factory-trimmed accuracy | Choose for space-constrained designs needing programmability and lower impedance, accepting calibration overhead |
Compared with LM385MX-2.5/NOPB and TLVH431AIDBZR, LM285MX-2.5/NOPB uniquely balances industrial temperature range (−40°C to +85°C), factory-trimmed 2.5 V accuracy, and SOIC-8 compatibility-making it optimal for drop-in replacement in legacy metering and control systems requiring guaranteed performance without layout changes.
Availability
LM285MX-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial process transmitters, calibration equipment, and medical monitoring devices requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM285MX-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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision reference design and high-reliability manufacturing.
The LM285 series belongs to TI's micropower shunt voltage reference product line, engineered specifically for battery-operated and thermally demanding applications where low quiescent current, tight initial tolerance, and robust capacitive-load stability are essential.
FAQ
What is the maximum reverse current rating for LM285MX-2.5/NOPB?
The absolute maximum reverse current for LM285MX-2.5/NOPB is 30 mA. Exceeding this value risks permanent damage. For reliable operation, maintain reverse current between 20 μA and 20 mA per datasheet specifications - this range ensures optimal regulation, low dynamic impedance, and minimal temperature drift. The device is not rated for forward conduction.
Does LM285MX-2.5/NOPB require an output capacitor for stability?
Yes, LM285MX-2.5/NOPB requires a minimum 1 μF ceramic capacitor at the cathode (Pin 2) to ensure stability under all operating conditions. The datasheet confirms exceptional capacitive loading tolerance - unlike many references, it remains stable even with larger values (e.g., 10 μF), making it ideal for noisy battery-supplied systems where bulk capacitance improves ripple rejection without risk of oscillation.
Can LM285MX-2.5/NOPB replace LM385MX-2.5/NOPB in existing designs?
Yes, LM285MX-2.5/NOPB is a direct pin-compatible and functionally equivalent replacement for LM385MX-2.5/NOPB in SOIC-8 layout, with identical pinout, marking, and electrical interface. The key upgrade is its extended operating temperature range (−40°C to +85°C vs. 0°C to +70°C), allowing immediate use in colder industrial or outdoor environments without PCB modification.
What is the thermal resistance (θJA) of LM285MX-2.5/NOPB in SOIC-8 package?
The junction-to-ambient thermal resistance (θJA) for LM285MX-2.5/NOPB in SOIC-8 package is 165°C/W under standard JEDEC test conditions (2s2 board, 1 oz copper). This value enables safe operation up to 85°C ambient at full 20 mA load without heatsinking - critical for sealed enclosures or stacked PCB assemblies where airflow is restricted.
Is LM285MX-2.5/NOPB suitable for precision current-source applications?
Yes, LM285MX-2.5/NOPB is explicitly designed for precision current sources, as confirmed by TI's application diagrams (e.g., Figure 19). With its 2.5 V reference, 0.6 Ω dynamic impedance, and 20 μA–20 mA operating range, it enables accurate 1 μA–1 mA sourcing using a single series resistor - widely used in sensor excitation, thermocouple cold-junction compensation, and calibration standards.
LM285MX-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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1.5%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 120µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 20 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM285MX-2.5/NOPB FAQ
1.How can I place an order for LM285MX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285MX-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 LM285MX-2.5/NOPB reliable?
The price and inventory of LM285MX-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 LM285MX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM285MX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285MX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285MX-2.5/NOPB?
LM285MX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285MX-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 LM285MX-2.5/NOPB?
For technical support, including LM285MX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285MX-2.5/NOPB requirements.
6.How does Aetrix verify that LM285MX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285MX-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 LM285MX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM285MX-2.5/NOPB?
All LM285MX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285MX-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 LM285MX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM285MX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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