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Texas Instruments LM285BYMX-2.5/NOPB
- Part No.:
- LM285BYMX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285BYMX-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,722
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Product details
Overview
LM285BYMX-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, 50 ppm/°C max temperature coefficient, and operation over −40°C to +85°C. It functions as a stable reference in portable meters, battery-powered regulators, and precision analog circuits requiring low quiescent current (20 μA min) and low dynamic impedance (≤2.5 Ω).
For engineers reviewing the LM285BYMX-2.5/NOPB datasheet, LM285BYMX-2.5/NOPB pinout, LM285BYMX-2.5/NOPB application, or LM285BYMX-2.5/NOPB equivalent, key selection criteria include operating current range (20 μA–20 mA), reverse dynamic impedance, long-term stability (20 ppm), noise performance (120 μV rms), and SOIC-8 package compatibility with standard surface-mount assembly.
Technical Context
The LM285BYMX-2.5/NOPB uses a band-gap core architecture trimmed on-chip for tight voltage accuracy and exhibits low sensitivity to capacitive loading-enabling stable operation without external compensation. Its two-terminal configuration simplifies design while maintaining regulation across wide supply variations.
It achieves micropower operation via optimized transistor-resistor topology, yielding low noise (120 μV rms, 10 Hz–10 kHz) and excellent long-term stability (20 ppm after 1000 hours). The device's thermal performance is characterized by θJA = 165°C/W in SOIC-8, supporting reliable operation in industrial ambient conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V ±20 mV (±0.8%) at 25°C - ensures accurate ADC/DAC biasing and sensor excitation |
| Temp Coefficient | 50 ppm/°C max - limits drift to ≤1.25 mV over full −40°C to +85°C range |
| Operating Current | 20 μA to 20 mA - supports ultra-low-power sleep modes and high-current precision references |
| Dynamic Impedance | ≤2.5 Ω at 100 μA - maintains regulation under fast load transients in feedback loops |
| Wideband Noise | 120 μV rms (10 Hz–10 kHz) - preserves signal integrity in high-resolution measurement front-ends |
| Long-Term Stability | 20 ppm (1000 hr @ 25°C) - reduces calibration frequency in field-deployed instrumentation |
Pinout & Package
LM285BYMX-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 gull-wing leads. Pin 1 is marked by a notch or dot; pins are numbered counterclockwise from the marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Input) | Current sink node - connects to unregulated supply or current source |
| Pin 2 | Cathode (Output) | Stable 2.5 V reference node - decoupling capacitor required for noise suppression |
| Pins 3–8 | No Connect / Thermal Pad | Internally tied to die attach pad - electrically isolated; may be grounded for thermal relief |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥1 μF output capacitance - eliminates need for series isolation resistor in battery-powered designs |
| Micropower Operation | 20 μA minimum operating current - enables multi-year battery life in portable data loggers |
| Low Dynamic Impedance | ≤2.5 Ω - minimizes output voltage sag during 10 mA step-load transitions |
| Hermetic Alternative Available | LM285BYM-2.5/NOPB in same SOIC package - identical electrical specs with tube packaging for prototyping |
| RoHS/Green Compliant | Sn finish, Level-1 MSL rating - supports lead-free reflow without moisture sensitivity concerns |
Applications
| Portable Multimeter Reference | Battery-Powered Sensor Signal Chain |
|---|---|
Use Scenario: High-impedance 3½-digit handheld multimeter requiring stable reference for autoranging ADC. IC Role / Device Role / Timing Role: 2-terminal voltage reference providing 2.5 V基准 for successive-approximation ADC reference input. Use Value: ±20 mV initial tolerance and 50 ppm/°C drift ensure <0.1% full-scale error across operating temperature range. | Use Scenario: Low-power environmental sensor node (temperature/humidity) powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Micropower reference for ratiometric sensor excitation and ADC reference in sleep-wake cycles. Use Value: 20 μA minimum operating current extends battery life beyond 5 years at 1-sample-per-minute duty cycle. |
| Industrial Process Transmitter | Calibration Equipment Reference |
Use Scenario: 4–20 mA loop-powered transmitter with local analog signal conditioning. IC Role / Device Role / Timing Role: Precision reference for op-amp-based current-sense amplifier and DAC-controlled output stage. Use Value: 20 ppm long-term stability reduces annual recalibration requirement in field-deployed units. | Use Scenario: Benchtop calibration source for verifying 16-bit DAC linearity and offset. IC Role / Device Role / Timing Role: Low-noise, low-drift reference feeding precision resistor ladder network. Use Value: 120 μV rms noise and ≤2.5 Ω dynamic impedance prevent measurement uncertainty in sub-LSB testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM285BXMX-2.5/NOPB | Tighter initial tolerance (±15 mV vs. ±20 mV); same tempco (50 ppm/°C), SOIC-8 package | Better accuracy-critical applications (e.g., medical sensor front-end) where 0.1% absolute error is mandatory | Select when initial accuracy outweighs cost sensitivity; otherwise LM285BYMX-2.5/NOPB offers optimal balance |
| REF3025AIDBZR | Lower tempco (50 ppm/°C same), lower noise (45 μV rms), but higher min current (50 μA) and SOT-23-3 package | Space-constrained PCBs where SOIC-8 footprint is prohibitive; trade-off is reduced current efficiency | Choose for ultra-low-noise or space-limited designs; LM285BYMX-2.5/NOPB preferred for legacy SOIC layouts and micropower priority |
Compared with LM285BXMX-2.5/NOPB, the LM285BYMX-2.5/NOPB trades 5 mV initial tolerance for broader production yield and cost efficiency, while versus REF3025AIDBZR it retains SOIC-8 compatibility and superior micropower capability below 50 μA-critical for energy-harvesting systems.
Availability
LM285BYMX-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered IoT sensors, industrial 4–20 mA transmitters, and calibration equipment requiring stable component supply with consistent SOIC-8 packaging and RoHS compliance.
Supply support for LM285BYMX-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, embedded processing, and power management ICs, with decades of expertise in precision reference design.
The LM285 family is part of TI's micropower voltage reference product line, engineered for battery-operated and energy-sensitive applications where low quiescent current, stable output, and robust temperature performance are essential.
FAQ
What is the operating temperature range for LM285BYMX-2.5/NOPB?
The LM285BYMX-2.5/NOPB is rated for operation from −40°C to +85°C. This industrial-grade range supports deployment in outdoor sensors, factory-floor transmitters, and automotive cabin electronics where ambient temperatures fluctuate widely. Junction temperature must remain ≤125°C under actual operating conditions, per thermal characteristics in the datasheet.
Does LM285BYMX-2.5/NOPB require an external capacitor for stability?
No, the LM285BYMX-2.5/NOPB is specifically designed to be exceptionally tolerant of capacitive loading and remains stable with output capacitance up to 10 μF. A 1 μF ceramic capacitor is recommended at the cathode (Pin 2) to suppress high-frequency noise, but no series isolation resistor or complex compensation network is needed-simplifying layout and reducing BOM count.
What is the minimum operating current for LM285BYMX-2.5/NOPB?
The LM285BYMX-2.5/NOPB has a minimum operating current of 20 μA, verified across the full −40°C to +85°C temperature range. This enables use in ultra-low-power applications such as wake-on-event sensor nodes, where the reference remains active during deep sleep while consuming less than 50 nW from a 2.5 V rail.
Can LM285BYMX-2.5/NOPB replace LM385-2.5-N in existing designs?
Yes, LM285BYMX-2.5/NOPB can replace LM385-2.5-N in SOIC-8 layouts, provided the operating temperature range (−40°C to +85°C vs. 0°C to +70°C) and initial tolerance (±20 mV vs. ±20 mV for LM385BY) meet system requirements. Electrical specs are functionally identical; however, verify thermal dissipation margins since θJA differs (165°C/W vs. 180°C/W).
Is LM285BYMX-2.5/NOPB pin-compatible with other SOIC-8 voltage references?
LM285BYMX-2.5/NOPB uses a 2-terminal configuration (Anode/Cathode), so only Pins 1 and 2 are functional; the remaining six pins are NC/thermal pad. It is not pin-compatible with 3-terminal references (e.g., REF3025) or shunt references with different pinouts. Always confirm terminal mapping using the SOIC-8 D0008A drawing before board reuse.
LM285BYMX-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:
- 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/NOPB FAQ
1.How can I place an order for LM285BYMX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285BYMX-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 LM285BYMX-2.5/NOPB reliable?
The price and inventory of LM285BYMX-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 LM285BYMX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM285BYMX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285BYMX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285BYMX-2.5/NOPB?
LM285BYMX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285BYMX-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 LM285BYMX-2.5/NOPB?
For technical support, including LM285BYMX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285BYMX-2.5/NOPB requirements.
6.How does Aetrix verify that LM285BYMX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285BYMX-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 LM285BYMX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM285BYMX-2.5/NOPB?
All LM285BYMX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285BYMX-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 LM285BYMX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM285BYMX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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