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Texas Instruments LM285BYMX-2.5
- Part No.:
- LM285BYMX-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285BYMX-2.5.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,049
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Product details
Overview
LM285BYMX-2.5 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 (A grade), 0.6 Ω dynamic impedance, and operation over 20 μA–20 mA current range. It is rated for −40°C to +85°C and supplied in an 8-pin SOIC package, commonly used in battery-powered meters, portable regulators, and precision analog circuitry where low quiescent current and long-term stability are critical.
For engineers reviewing the LM285BYMX-2.5 datasheet, LM285BYMX-2.5 pinout, LM285BYMX-2.5 application, or LM285BYMX-2.5 equivalent, key selection considerations include its guaranteed initial accuracy, wide operating current range, low temperature coefficient (50 ppm/°C max), capacitive loading tolerance, and SOIC-8 packaging compatibility with automated assembly and thermal performance requirements.
Technical Context
The LM285BYMX-2.5 implements a two-terminal band-gap reference architecture using on-chip trimmed resistors and transistors to achieve stable 2.5 V output without external components. Its design eliminates need for biasing circuitry and supports direct connection as a shunt reference across load or supply rail.
It features exceptionally low dynamic impedance (0.6 Ω at 100 μA, 20 Hz), wideband noise of 120 μVrms (10 Hz–10 kHz), and long-term stability of 20 ppm over 1000 hours - all validated under specified test conditions per SNVS743E.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V nominal output with ±20 mV (±0.8%) initial tolerance at 25°C - ensures predictable system-level calibration without trimming. |
| Operating Current Range | 20 μA to 20 mA - enables use from ultra-low-power sensor nodes to higher-current reference buffering stages. |
| Dynamic Impedance | 0.6 Ω at 100 μA, 20 Hz - minimizes output voltage perturbation under transient load changes. |
| Temperature Coefficient | 50 ppm/°C maximum (Y grade) - limits drift to ≤1.25 mV over full −40°C to +85°C range. |
| Long-Term Stability | 20 ppm over 1000 hours - supports designs requiring minimal recalibration in field-deployed instrumentation. |
| Wideband Noise | 120 μVrms, 10 Hz–10 kHz - suitable for high-resolution ADC references where noise floor impacts ENOB. |
Pinout & Package
LM285BYMX-2.5 is housed in an 8-pin SOIC package (Package Drawing D0008A, 3.9 mm × 4.9 mm, 1.75 mm max height). The device operates as a 2-terminal shunt reference: Pin 1 and Pin 8 are internally connected to the anode; Pins 2–7 are NC (no internal connection) and must be left unconnected or tied to ground per layout best practices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 & Pin 8 | Anode (Input/Output) | Connected to cathode of internal band-gap cell; serves as reference output node when used in shunt configuration. |
| Pins 2–7 | No Connect (NC) | Internally unconnected; must remain floating or grounded to minimize parasitic coupling and ensure specified performance. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive loading tolerance | Stable with ≥1 μF output capacitance - eliminates need for isolation resistors in noisy environments. |
| Micropower operation | 20 μA minimum operating current - extends battery life in portable and IoT edge sensors. |
| Hermetic-grade stability | On-chip trimming and passive-only topology (transistors/resistors only) - delivers low noise and superior long-term drift behavior. |
| Industrial temperature range | −40°C to +85°C operation - qualified for use in automotive body electronics, industrial PLC I/O modules, and outdoor metering. |
Applications
| Battery-Powered Digital Multimeter | Portable Gas Detector Signal Chain |
|---|---|
Use Scenario: Provides stable 2.5 V reference for 16-bit SAR ADC measuring sensor bridge outputs in handheld multimeters powered by 9 V alkaline batteries. IC Role / Device Role / Timing Role: Shunt voltage reference supplying excitation and conversion reference for precision analog front-end. Use Value: Enables <1 LSB INL error over battery discharge cycle due to tight initial tolerance and low dynamic impedance. |
Use Scenario: Supplies reference for electrochemical sensor signal conditioning in wearable gas monitors operating from coin-cell batteries. IC Role / Device Role / Timing Role: Low-quiescent-current shunt reference enabling sub-50 μA total system standby current. Use Value: Achieves 0.1% full-scale accuracy over temperature via 50 ppm/°C TC and 20 ppm/1000 hr stability. |
| Programmable Logic Controller Analog Input Module | Calibration Equipment Reference Source |
Use Scenario: Serves as master reference for multiple isolated 24-bit delta-sigma ADCs in DIN-rail mounted PLC I/O cards. IC Role / Device Role / Timing Role: Primary shunt reference feeding precision resistor ladder networks and op-amp buffers. Use Value: Maintains <±0.02% gain accuracy across industrial temperature range without active compensation. |
Use Scenario: Embedded in benchtop calibrators to generate traceable 2.5 V outputs for field instrument verification. IC Role / Device Role / Timing Role: Stable, low-noise DC reference source with metrology-grade long-term repeatability. Use Value: Delivers 20 ppm drift over 1000 hr, supporting annual calibration intervals per ISO/IEC 17025 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM285BXMX-2.5/NOPB | Same SOIC-8 package and −40°C to +85°C rating, but tighter initial tolerance (±15 mV, X grade) and lower tempco (30 ppm/°C). | Better suited for high-accuracy data acquisition where initial calibration margin is constrained. | Select LM285BXMX-2.5/NOPB when ±15 mV tolerance and 30 ppm/°C TC are required; LM285BYMX-2.5/NOPB remains optimal for cost-sensitive industrial applications needing Y-grade specs. |
| LM385BYMX-2.5/NOPB | Identical electrical specs and marking, but rated for 0°C to +70°C commercial temperature range and different MSL/lead finish compliance. | Restricted to non-industrial ambient environments such as consumer test equipment or office-based instrumentation. | Choose LM385BYMX-2.5/NOPB only for cost-sensitive commercial designs with no extended temperature requirement; LM285BYMX-2.5/NOPB is mandatory for industrial deployment. |
Compared with LM285BXMX-2.5/NOPB, LM285BYMX-2.5/NOPB trades ±5 mV initial tolerance and 20 ppm/°C higher tempco for broader availability and lower unit cost; versus LM385BYMX-2.5/NOPB, it adds −40°C startup capability and extended thermal reliability essential for factory automation and outdoor infrastructure.
Availability
LM285BYMX-2.5 is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial PLC analog input modules, and portable environmental sensors requiring stable component supply across multi-year production cycles.
Supply support for LM285BYMX-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 specializing in analog and embedded processing technologies, with decades of heritage in precision analog ICs and broad distribution infrastructure.
The LM285 series belongs to TI's micropower shunt voltage reference product line, engineered specifically for applications demanding low operating current, high accuracy, and robust thermal performance in industrial and portable systems.
FAQ
What is the operating temperature range for LM285BYMX-2.5?
The LM285BYMX-2.5 is rated for continuous operation from −40°C to +85°C. This industrial temperature range is verified per SNVS743E and supported by thermal resistance data (θJA = 165°C/W for SOIC-8), making it suitable for deployment in harsh environments including factory floors and outdoor enclosures where ambient extremes occur.
Can LM285BYMX-2.5 be used with large output capacitors?
Yes, LM285BYMX-2.5 is explicitly designed for exceptional capacitive loading tolerance - datasheet Figure 6 confirms stable operation with ≥1 μF ceramic or tantalum capacitors. This eliminates need for series isolation resistors and simplifies layout in noise-sensitive applications like precision ADC reference rails.
What does the 'Y' suffix indicate in LM285BYMX-2.5?
The 'Y' suffix denotes the temperature coefficient grade: LM285BYMX-2.5 has a maximum average temperature coefficient of 50 ppm/°C, as tested per JEDEC JESD22-A119. This is distinct from the 'X' grade (30 ppm/°C) and standard 'M' grade (150 ppm/°C), and is confirmed in Table 1 of SNVS743D.
How many pins are functional in the SOIC-8 package of LM285BYMX-2.5?
Only two pins are functional in LM285BYMX-2.5: Pin 1 and Pin 8 serve as the anode (output/reference node); Pins 2–7 are No Connect (NC) terminals with no internal bonding. TI's Package Outline D0008A and Electrical Characteristics table confirm this 2-terminal shunt topology.
Is LM285BYMX-2.5 RoHS compliant and lead-free?
Yes, LM285BYMX-2.5/NOPB is RoHS and Green compliant per TI's Package Option Addendum (30-Apr-2024), with Sn (matte tin) lead finish and Level-1 MSL rating (260°C peak reflow). The '/NOPB' suffix explicitly indicates lead-free packaging, and TI certifies full compliance with EU RoHS Directive 2011/65/EU.
LM285BYMX-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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1.5%
- Temperature Coefficient:
- 50ppm/°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
LM285BYMX-2.5 FAQ
1.How can I place an order for LM285BYMX-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285BYMX-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 LM285BYMX-2.5 reliable?
The price and inventory of LM285BYMX-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 LM285BYMX-2.5 is usually 5 days.
3.What payment methods are accepted for LM285BYMX-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285BYMX-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285BYMX-2.5?
LM285BYMX-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285BYMX-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 LM285BYMX-2.5?
For technical support, including LM285BYMX-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285BYMX-2.5 requirements.
6.How does Aetrix verify that LM285BYMX-2.5 is sourced from the original manufacturer or authorized distributors?
All LM285BYMX-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 LM285BYMX-2.5 meets industry standards.
7.What is the process for return or replacement of LM285BYMX-2.5?
All LM285BYMX-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM285BYMX-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 LM285BYMX-2.5 part is unused and in its original packaging.
Return procedure for LM285BYMX-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM285BYMX-2.5 Tags
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