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Texas Instruments LM285BYM-2.5/NOPB
- Part No.:
- LM285BYM-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285BYM-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,617
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Product details
Overview
LM285BYM-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 temperature coefficient, and operation over −40°C to +85°C. It functions as a stable low-power reference in portable meters, battery-powered analog circuits, and precision current sources requiring minimal quiescent current.
For engineers reviewing the LM285BYM-2.5/NOPB datasheet, LM285BYM-2.5/NOPB pinout, LM285BYM-2.5/NOPB application, or LM285BYM-2.5/NOPB equivalent, key selection criteria include its SOIC-8 package, 20 μA to 20 mA operating current range, 0.6 Ω dynamic impedance, low noise (120 μV rms), and compatibility with capacitive loads up to 10 μF without instability.
Technical Context
The LM285BYM-2.5/NOPB uses on-chip trimming for tight voltage tolerance and relies solely on transistors and resistors-enabling low noise and long-term stability. Its band-gap architecture provides predictable temperature behavior across its full operating range.
It operates as a 2-terminal shunt reference, sinking current from an external resistor to maintain 2.5 V at its cathode. The device exhibits exceptionally low dynamic impedance (0.6 Ω) and wideband noise of 120 μV rms (10 Hz–10 kHz), supporting high-accuracy analog signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V ±20 mV - ensures accurate ADC/DAC biasing and sensor excitation within 0.8% error at 25°C |
| Initial Tolerance | ±0.8% (Grade Y) - enables single-point calibration in portable instrumentation |
| Temp Coefficient | 50 ppm/°C - limits drift to ±2.125 mV over −40°C to +85°C ambient |
| Operating Current | 20 μA to 20 mA - supports ultra-low-power sleep modes and high-current regulation simultaneously |
| Dynamic Impedance | 0.6 Ω - maintains voltage stability under fast load transients in precision references |
| Wideband Noise | 120 μV rms (10 Hz–10 kHz) - minimizes added noise in high-resolution data acquisition systems |
| Long-Term Stability | 20 ppm (1000 hr) - ensures calibration integrity in field-deployed measurement equipment |
Pinout & Package
LM285BYM-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 beveled corner or index area; pins are numbered counterclockwise from Pin 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Input) | Connects to external current-setting resistor; supplies operating current into device |
| Pin 2 | Cathode (Output) | Provides regulated 2.5 V reference; must be decoupled with ≥0.1 μF capacitor for stability |
| Pins 3–8 | No Connect / Thermal Pad | Internally unconnected; may be left floating or tied to cathode (Pin 2) for thermal enhancement |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with up to 10 μF output capacitance - eliminates need for series isolation resistors in battery-powered designs |
| Micropower Operation | 20 μA minimum operating current - extends shelf-life-equivalent battery life in portable meters and IoT sensors |
| Low Dynamic Impedance | 0.6 Ω at 100 μA - reduces output voltage sag during transient load steps in precision current sources |
| Hermetic Stability | 20 ppm long-term drift (1000 hr) - supports recalibration intervals >5 years in industrial calibrators |
| ESD Robustness | 2 kV HBM rating - withstands handling in non-ESD-controlled assembly environments |
Applications
| Portable Multimeter Reference | Low-Power Sensor Excitation |
|---|---|
Use Scenario: High-impedance 3½-digit handheld multimeter requiring stable 2.5 V reference for ADC scaling and autoranging. IC Role / Device Role / Timing Role: Shunt voltage reference providing precision scaling voltage for successive-approximation ADC input range. Use Value: Enables ±0.1% measurement accuracy over battery discharge (2.8 V–4.2 V supply) with <30 μA total reference circuit current. | Use Scenario: Battery-powered gas sensor module using constant-current excitation for electrochemical cell biasing. IC Role / Device Role / Timing Role: Precision current source reference enabling 100 nA–100 μA programmable excitation via external op-amp and MOSFET. Use Value: Delivers 50 ppm/°C drift-limited current accuracy across −20°C to +60°C operating range, critical for ppm-level gas detection. |
| Calibration Standard for Field Instruments | Micropower Thermocouple Compensator |
Use Scenario: Handheld calibration tool used to verify thermocouple transmitters and RTD conditioners in process plants. IC Role / Device Role / Timing Role: Primary voltage standard traceable to NIST via factory trim; referenced by internal DAC and comparator circuitry. Use Value: Maintains ±20 mV absolute accuracy over 1000-hour storage and repeated thermal cycling, meeting ANSI/ISA-5.1 Class C calibration requirements. | Use Scenario: Wireless temperature node with Type-K thermocouple and cold-junction compensation in HVAC control. IC Role / Device Role / Timing Role: Reference for precision 1.8 μA/°K current source that generates Kelvin-proportional voltage for cold-junction offset correction. Use Value: Achieves ±0.5°C system accuracy from −40°C to +85°C ambient using only 50 μA total supply current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BYM-2.5/NOPB | Same electrical specs but rated for 0°C to 70°C; lower temp grade than LM285BYM-2.5/NOPB's −40°C to 85°C range | Not suitable for automotive or industrial edge nodes requiring extended temperature operation | Select LM285BYM-2.5/NOPB when ambient exceeds 70°C or requires industrial-grade qualification |
| REF3025AIDBZR | 2.5 V, ±0.2% initial accuracy, 50 ppm/°C, 50 μA min current; SOT-23-3 package; higher accuracy but higher quiescent current | Better for high-precision data loggers where 0.2% tolerance outweighs 30 μA extra current draw | Choose REF3025AIDBZR when system-level accuracy dominates power budget constraints |
Compared with LM385BYM-2.5/NOPB and REF3025AIDBZR, the LM285BYM-2.5/NOPB uniquely balances industrial temperature range, micropower operation (20 μA min), and SOIC-8 layout compatibility-making it optimal for cost-sensitive, battery-operated field instruments needing robustness without premium accuracy.
Availability
LM285BYM-2.5/NOPB is available at Aetrix Electronics and suitable for portable test equipment, industrial sensor nodes, and calibration tools requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM285BYM-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, designed specifically for battery-powered instrumentation, portable measurement systems, and low-quiescent-current industrial sensing applications.
FAQ
What is the minimum operating current for LM285BYM-2.5/NOPB?
The LM285BYM-2.5/NOPB requires a minimum operating current of 20 μA to maintain regulation within specification. Below this threshold, output voltage deviates significantly from 2.5 V; design margins should ensure sustained current above 25 μA across all operating conditions including lowest temperature and supply voltage.
Can LM285BYM-2.5/NOPB drive a 10 μF capacitor directly?
Yes, the LM285BYM-2.5/NOPB is explicitly designed for exceptional capacitive load tolerance and remains stable with up to 10 μF output capacitance. This eliminates the need for series isolation resistors in most applications, simplifying layout and improving transient response in battery-powered reference circuits.
What is the temperature coefficient of LM285BYM-2.5/NOPB?
The LM285BYM-2.5/NOPB has a guaranteed average temperature coefficient of 50 ppm/°C (Grade Y). This means its output voltage drift is bounded to ±2.125 mV over the full −40°C to +85°C operating range, making it suitable for applications demanding consistent accuracy across environmental variations.
Is LM285BYM-2.5/NOPB pin-compatible with other LM285 variants in SOIC-8?
Yes, all LM285-xM-2.5/NOPB variants-including LM285BXM-2.5/NOPB and LM285M-2.5/NOPB-share identical SOIC-8 pinout and footprint (Package Drawing D0008A). Pin 1 is anode, Pin 2 is cathode, and Pins 3–8 are NC/thermal pad, enabling direct substitution within the same package family.
What does the 'Y' suffix indicate in LM285BYM-2.5/NOPB?
The 'Y' suffix in LM285BYM-2.5/NOPB denotes the temperature coefficient grade: 50 ppm/°C maximum. It also corresponds to ±20 mV (±0.8%) initial tolerance at 25°C. This grade is distinct from 'X' (30 ppm/°C) and standard 'B' (150 ppm/°C), offering a balanced trade-off between stability and cost for industrial applications.
LM285BYM-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:
- 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
LM285BYM-2.5/NOPB FAQ
1.How can I place an order for LM285BYM-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285BYM-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 LM285BYM-2.5/NOPB reliable?
The price and inventory of LM285BYM-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 LM285BYM-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM285BYM-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285BYM-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285BYM-2.5/NOPB?
LM285BYM-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285BYM-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 LM285BYM-2.5/NOPB?
For technical support, including LM285BYM-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285BYM-2.5/NOPB requirements.
6.How does Aetrix verify that LM285BYM-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285BYM-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 LM285BYM-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM285BYM-2.5/NOPB?
All LM285BYM-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285BYM-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 LM285BYM-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM285BYM-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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