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Texas Instruments LM285BXM-2.5/NOPB
- Part No.:
- LM285BXM-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285BXM-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,233
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Product details
Overview
LM285BXM-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, and operation over 20 μA–20 mA current range. It serves as a stable reference in portable meters, battery-powered analog circuits, and precision current sources where low quiescent current and temperature stability are critical.
For engineers reviewing the LM285BXM-2.5/NOPB datasheet, LM285BXM-2.5/NOPB pinout, LM285BXM-2.5/NOPB application, or LM285BXM-2.5/NOPB equivalent, key selection criteria include its SOIC-8 package, −40°C to +85°C operating temperature, 30 ppm/°C temperature coefficient (X suffix), and compatibility with capacitive loads up to 10 μF without instability.
Technical Context
The LM285BXM-2.5/NOPB implements a two-terminal band-gap reference architecture using on-chip trimmed resistors and transistors to achieve tight initial accuracy and low long-term drift. Its design eliminates the need for external biasing components and supports direct connection in series with load or current-setting resistor.
It operates as a shunt reference: reverse-biased across a current source, regulating voltage by sinking excess current. The device exhibits 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 biasing and precision sensor excitation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±20 mV (±0.8%) at 25°C - ensures accurate scaling for 12-bit+ data converters |
| Initial Tolerance | ±20 mV (Grade A) - reduces calibration burden in production test |
| Operating Current Range | 20 μA to 20 mA - supports ultra-low-power sleep modes and high-accuracy active operation |
| Dynamic Impedance | 0.6 Ω at 100 μA - maintains regulation under fast load transients in precision analog front-ends |
| Temperature Coefficient | 30 ppm/°C (X suffix) - limits voltage drift to ±2.55 mV over −40°C to +85°C |
| Wideband Noise | 120 μVrms, 10 Hz–10 kHz - avoids noise-induced errors in high-resolution measurement systems |
| Long-Term Stability | 20 ppm (1000 hr @ 25°C) - ensures reference integrity over product lifetime without recalibration |
Pinout & Package
LM285BXM-2.5/NOPB is housed in an 8-pin SOIC package (Package Drawing D0008A), 3.90 mm × 4.90 mm footprint, 1.75 mm max height, RoHS-compliant matte tin lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Cathode for shunt operation) | Connected to system ground when used as shunt reference; reverse-biased terminal |
| Pin 2 | Cathode (Anode for shunt operation) | Output node - delivers regulated 2.5 V; must be connected to current source and load |
| Pins 3–8 | No Connect / Internally Unused | Electrically isolated; no internal connection - must remain unconnected per TI specification |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥10 μF output capacitance - eliminates need for external isolation resistor in battery-powered designs |
| Micropower Operation | 20 μA minimum operating current - enables >10-year shelf-life battery operation in portable instrumentation |
| Low Dynamic Impedance | 0.6 Ω at 100 μA - minimizes voltage droop during ADC sampling bursts or sensor excitation pulses |
| On-Chip Trimmed Accuracy | ±20 mV initial tolerance - reduces post-manufacturing trimming steps in automated test systems |
| Hermetic Stability | 20 ppm long-term drift (1000 hr) - ensures calibration retention in medical and industrial field equipment |
Applications
| Portable Digital Multimeter Reference | Low-Power Sensor Excitation |
|---|---|
Use Scenario: Battery-powered handheld DMM requiring stable 2.5 V reference for 16-bit SAR ADC scaling over 0–10 V input range. IC Role / Device Role / Timing Role: Shunt voltage reference providing precision scaling voltage to ADC reference input. Use Value: Enables ±0.02% full-scale accuracy with <20 μA quiescent current, extending alkaline battery life to >2 years. |
Use Scenario: 4–20 mA loop-powered pressure transmitter using RTD or bridge sensor with microcontroller-based signal conditioning. IC Role / Device Role / Timing Role: Precision excitation source for ratiometric bridge measurement and ADC reference. Use Value: Delivers 2.5 V ±20 mV with 30 ppm/°C TC, eliminating gain error drift across industrial temperature range. |
| Calibrated Thermocouple Compensator | Micropower Data Logger Bias |
Use Scenario: Portable thermocouple reader requiring cold-junction compensation at <50 μA total supply current. IC Role / Device Role / Timing Role: Stable 2.5 V reference for generating Kelvin-proportional current (e.g., 1.8 μA/K) in compensation circuitry. Use Value: Enables 0.1°C resolution over −20°C to +85°C ambient with no external trimming or calibration. |
Use Scenario: Remote environmental monitor logging temperature/humidity every 5 minutes using coin-cell battery (CR2032). IC Role / Device Role / Timing Role: Low-drift reference for ADC and analog sensor interface during brief wake-up cycles. Use Value: Draws only 20 μA in standby, contributing <0.05% of total system current, preserving 5+ year battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BXM-2.5/NOPB | Same 2.5 V, ±20 mV, 30 ppm/°C spec; rated for 0°C to 70°C (vs. −40°C to 85°C) | Not suitable for extended industrial temperature environments | Select when cost sensitivity outweighs extended temperature requirement and ambient stays within commercial range |
| LM285BYM-2.5/NOPB | Same package and pinout; 50 ppm/°C tempco (Y suffix) vs. 30 ppm/°C (X suffix) | Higher drift (±4.25 mV over −40°C to +85°C) limits use in high-accuracy metrology | Choose for cost-sensitive consumer applications where ±0.2% total error budget allows higher TC |
Compared with LM385BXM-2.5/NOPB and LM285BYM-2.5/NOPB, the LM285BXM-2.5/NOPB uniquely combines industrial temperature range (−40°C to +85°C), 30 ppm/°C stability, and SOIC-8 packaging-making it optimal for embedded industrial sensors and portable test equipment requiring both ruggedness and precision.
Availability
LM285BXM-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor nodes, and battery-powered data loggers requiring stable component supply with guaranteed long-term continuity.
Supply support for LM285BXM-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 leadership in precision analog ICs and voltage references.
The LM285 series belongs to TI's micropower shunt reference product line, engineered specifically for battery-operated and space-constrained applications demanding low IQ, high accuracy, and robust thermal performance.
FAQ
What is the maximum capacitive load the LM285BXM-2.5/NOPB can drive without oscillation?
The LM285BXM-2.5/NOPB is explicitly characterized for stable operation with ≥10 μF output capacitance, including ceramic, tantalum, and electrolytic types. This eliminates the need for series isolation resistors in most battery-powered applications, simplifying layout and reducing component count while maintaining regulation integrity across temperature and current extremes. The LM285BXM-2.5/NOPB achieves this via internal compensation optimized for wide capacitive loading.
Does the LM285BXM-2.5/NOPB require an external current-setting resistor?
Yes - as a 2-terminal shunt reference, the LM285BXM-2.5/NOPB requires an external current-source resistor connected between the supply rail and Pin 2 (cathode). The resistor value is calculated as R = (VSUPPLY − 2.5 V) / IREF, where IREF must be maintained between 20 μA and 20 mA. Pin 1 connects to ground. No additional biasing or feedback components are needed for basic operation. The LM285BXM-2.5/NOPB functions autonomously once properly biased.
What is the meaning of the 'X' suffix in LM285BXM-2.5/NOPB?
The 'X' suffix in LM285BXM-2.5/NOPB denotes the temperature coefficient grade: 30 ppm/°C maximum average drift over the full operating range (−40°C to +85°C). This is tighter than the 'Y' grade (50 ppm/°C) and significantly better than standard grade (150 ppm/°C), making the LM285BXM-2.5/NOPB suitable for applications demanding high thermal stability without external compensation. The 'X' grade is verified per TI's production test limits and applies specifically to the LM285BXM-2.5/NOPB variant.
Can LM285BXM-2.5/NOPB replace LM385-2.5 in existing designs?
LM285BXM-2.5/NOPB is not a direct drop-in replacement for LM385-2.5 due to differing temperature ranges: LM285BXM-2.5/NOPB operates from −40°C to +85°C, while LM385-2.5 is rated 0°C to +70°C. Electrical specs (2.5 V, ±20 mV, 30 ppm/°C) match identically, and both use SOIC-8 packaging with identical pin 1–2 functionality. However, board-level validation is required if the application operates below 0°C or above 70°C. The LM285BXM-2.5/NOPB offers enhanced thermal coverage without circuit modification.
Is LM285BXM-2.5/NOPB compatible with lead-free reflow processes?
Yes - LM285BXM-2.5/NOPB features matte tin (Sn) lead finish and is rated MSL Level-1 with unlimited floor life and peak reflow temperature of 260°C, fully compliant with JEDEC J-STD-020 and IPC-7095 standards for lead-free assembly. The SOIC-8 package (D0008A) has been qualified for standard Pb-free reflow profiles including ramp-to-spike and soak-and-reflow, with no special prebake or handling requirements beyond standard ESD precautions. The LM285BXM-2.5/NOPB meets RoHS and green material requirements.
LM285BXM-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- 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:
- 30ppm/°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
LM285BXM-2.5/NOPB FAQ
1.How can I place an order for LM285BXM-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285BXM-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 LM285BXM-2.5/NOPB reliable?
The price and inventory of LM285BXM-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 LM285BXM-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM285BXM-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285BXM-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285BXM-2.5/NOPB?
LM285BXM-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285BXM-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 LM285BXM-2.5/NOPB?
For technical support, including LM285BXM-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285BXM-2.5/NOPB requirements.
6.How does Aetrix verify that LM285BXM-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285BXM-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 LM285BXM-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM285BXM-2.5/NOPB?
All LM285BXM-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285BXM-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 LM285BXM-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM285BXM-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM285BXM-2.5/NOPB Tags
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