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Texas Instruments LM285BYM-1.2/NOPB
- Part No.:
- LM285BYM-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285BYM-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:120
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Product details
Overview
LM285BYM-1.2/NOPB from Texas Instruments is a micropower 2-terminal band-gap voltage reference diode delivering a precise 1.235 V output with ±1% initial tolerance, 50 ppm/°C temperature coefficient (Y-suffix), and 1 Ω dynamic impedance across 10 μA–20 mA operating current. It operates from −40°C to +85°C in an SOIC-8 package and is used in battery-powered precision analog circuits such as portable meters, low-power regulators, and thermocouple cold-junction compensators.
For engineers reviewing the LM285BYM-1.2/NOPB datasheet, LM285BYM-1.2/NOPB pinout, LM285BYM-1.2/NOPB application, or LM285BYM-1.2/NOPB equivalent, this page provides verified specifications, SOIC-8 terminal mapping, real-world use cases including micropower 1.5 V battery references and 1 μA–1 mA current sources, and validated alternative options for design continuity.
Technical Context
The LM285BYM-1.2/NOPB implements a band-gap reference architecture using on-chip trimmed transistors and resistors, enabling low-noise operation (60 μVrms, 10 Hz–10 kHz) and excellent long-term stability (20 ppm over 1000 hours). Its 2-terminal configuration simplifies layout and eliminates external bias components.
Designed for wide-current-range operation, it maintains regulation from 10 μA up to 20 mA-supporting both ultra-low-power sensing and higher-drive applications without external buffering. The Y-suffix grade specifies a maximum average temperature coefficient of 50 ppm/°C over its full operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; tight initial tolerance (±1%) enables direct use in precision ADC references without trimming. |
| Initial Tolerance | ±1% at 25°C; reduces calibration burden in production test for portable instrumentation. |
| Temp Coefficient | 50 ppm/°C (Y-suffix); ensures ≤0.4 mV drift over −40°C to +85°C ambient, critical for field-deployed sensors. |
| Dynamic Impedance | 1 Ω at 100 μA; minimizes load-induced voltage variation in high-impedance feedback networks. |
| Operating Current | 10 μA to 20 mA; supports micropower standby (e.g., 30 μA total system IQ) and active regulation modes in same design. |
| Wideband Noise | 60 μVrms (10 Hz–10 kHz); low enough for 12-bit+ resolution in battery-operated data loggers. |
| Long-Term Stability | 20 ppm over 1000 hours; supports >5-year field reliability in unattended monitoring systems. |
Pinout & Package
LM285BYM-1.2/NOPB is housed in an SOIC-8 package (Package Drawing D, JEDEC MS-012 variation AA), 3.91 mm × 4.90 mm × 1.75 mm, RoHS-compliant with Sn lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Input) | Connects to higher-potential supply node; reverse-biased during normal reference operation. |
| Pin 2 | Cathode (Output) | Delivers stable 1.235 V reference; requires minimum 10 μA sink current to maintain regulation. |
| Pins 3–8 | No Connect / Die Attach Pad | Internally connected to die attach pad; TI recommends connecting Pin 3 to Pin 2 or leaving floating per datasheet Figure 3. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥1 μF output capacitance-enables direct decoupling without series resistance or isolation. |
| Micropower Operation | Functional down to 10 μA-supports multi-year battery life in wireless sensor nodes powered by coin cells. |
| Low Dynamic Impedance | 1 Ω at 100 μA-maintains <0.1% output error under 100 μA load transients typical in SAR ADC sampling. |
| On-Chip Trimmed Accuracy | ±1% initial tolerance achieved via laser trimming-eliminates need for external potentiometers in factory calibration. |
| Hermetic Alternative Available | TO-package variants (e.g., LM285BYH-1.2/NOPB) offer enhanced reliability for aerospace/military use. |
Applications
| Portable Multimeter Reference | Micropower Battery Monitor |
|---|---|
Use Scenario: Handheld digital multimeter requiring stable 1.235 V reference for 3½-digit ADC conversion across 0–10 V input range. IC Role / Device Role / Timing Role: 2-terminal shunt reference providing excitation voltage for precision resistor divider network feeding ADC input. Use Value: ±1% initial tolerance and 50 ppm/°C TC ensure <0.2% full-scale error over −10°C to +50°C handheld operating range without recalibration. | Use Scenario: IoT node monitoring Li-ion cell voltage (2.5–4.2 V) using ultra-low-quiescent LDO and 12-bit ADC. IC Role / Device Role / Timing Role: Shunt reference establishing accurate threshold for battery protection comparator and ADC reference rail. Use Value: 10 μA minimum operating current allows continuous monitoring while consuming <1 μA additional system current-extending shelf life beyond 3 years. |
| Thermocouple Cold-Junction Compensator | 1 μA–1 mA Precision Current Source |
Use Scenario: Industrial K-type thermocouple interface in programmable logic controller (PLC) I/O module. IC Role / Device Role / Timing Role: Provides stable 1.235 V reference to generate temperature-proportional current for cold-junction sensor compensation circuitry. Use Value: 1 Ω dynamic impedance ensures <10 μV error under 10 μA current-source load variation-meeting IEC 61000-4-2 immunity requirements. | Use Scenario: Calibration-grade current source for testing 4–20 mA loop transmitters in process control labs. IC Role / Device Role / Timing Role: Sets reference voltage for op-amp-based Howland current source, defining output current magnitude. Use Value: 20 ppm/1000-hr long-term stability guarantees <0.02% current drift over calibration interval-reducing annual recalibration frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM285BXMX-1.2/NOPB | ±2% initial tolerance, 150 ppm/°C tempco (standard grade), otherwise identical SOIC-8 footprint and electrical behavior. | Suitable for cost-sensitive industrial controls where ±2% accuracy suffices and thermal drift is mitigated by software compensation. | Select when B-grade performance meets system error budget and lower unit cost is prioritized. |
| LM385BYM-1.2/NOPB | Same ±1% tolerance and 50 ppm/°C tempco, but rated for 0°C to +70°C only; shares SOIC-8 package and pinout. | Applicable in commercial-grade consumer electronics or indoor embedded systems with controlled ambient temperature. | Choose for non-industrial environments where extended temperature range is unnecessary and supply chain diversification is desired. |
Compared with LM285BXMX-1.2/NOPB, the LM285BYM-1.2/NOPB delivers tighter initial accuracy and superior thermal stability-critical for field instruments-while LM385BYM-1.2/NOPB offers identical precision at reduced temperature coverage, easing qualification for commercial designs.
Availability
LM285BYM-1.2/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and battery-powered data acquisition systems requiring stable component supply with guaranteed long-term availability.
Supply support for LM285BYM-1.2/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 voltage references and power management ICs.
The LM285 family was designed specifically for micropower, high-accuracy shunt references in battery-critical and space-constrained applications-emphasizing low IQ, tight tolerance, and robust capacitive-load stability.
FAQ
What is the operating temperature range of the LM285BYM-1.2/NOPB?
The LM285BYM-1.2/NOPB is rated for operation from −40°C to +85°C. This industrial temperature range supports deployment in automotive cabin modules, factory-floor sensors, and outdoor metering equipment where ambient conditions exceed commercial limits. The device's 50 ppm/°C temperature coefficient ensures predictable drift within this span, and its SOIC-8 package has a θJA of 165°C/W for reliable thermal performance under typical PCB layouts.
Does the LM285BYM-1.2/NOPB require an external current-limiting resistor?
Yes-the LM285BYM-1.2/NOPB is a 2-terminal shunt reference and must be biased with a series current-limiting resistor between the supply and its cathode (Pin 2). The resistor value is calculated as R = (VSUPPLY − 1.235 V) / IREF, where IREF is selected between 10 μA and 20 mA. For example, with a 5 V supply and 100 μA operating current, R = 37.65 kΩ. This resistor sets both operating point and transient response.
Can the LM285BYM-1.2/NOPB be used with large output capacitors?
Yes-the LM285BYM-1.2/NOPB is explicitly designed for exceptional capacitive loading tolerance and remains stable with ≥1 μF ceramic or tantalum output capacitance. This eliminates the need for series isolation resistors often required by older references, simplifying layout in noise-sensitive applications like precision ADC front-ends and reducing bill-of-materials count.
How does the LM285BYM-1.2/NOPB differ from the LM385BYM-1.2/NOPB?
The LM285BYM-1.2/NOPB and LM385BYM-1.2/NOPB share identical electrical specifications-including ±1% tolerance, 50 ppm/°C temperature coefficient, and SOIC-8 packaging-but differ in qualified temperature range: LM285BYM-1.2/NOPB is rated −40°C to +85°C (industrial), while LM385BYM-1.2/NOPB is rated 0°C to +70°C (commercial). Both are drop-in replacements electrically and mechanically where ambient constraints allow.
Is the LM285BYM-1.2/NOPB RoHS compliant and lead-free?
Yes-the LM285BYM-1.2/NOPB is RoHS compliant and lead-free, with "NOPB" in the part number indicating "No Lead (Pb)-Free." It features a matte tin (Sn) lead finish, complies with JEDEC MSL Level-1 (unlimited floor life), and meets TI's Green standard for low-halogen content (<1000 ppm Cl/Br). Full compliance documentation is available in TI's official packaging addendum.
LM285BYM-1.2/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):
- 1.235V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 60µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 10 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM285BYM-1.2/NOPB FAQ
1.How can I place an order for LM285BYM-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285BYM-1.2/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-1.2/NOPB reliable?
The price and inventory of LM285BYM-1.2/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-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM285BYM-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285BYM-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285BYM-1.2/NOPB?
LM285BYM-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285BYM-1.2/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-1.2/NOPB?
For technical support, including LM285BYM-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285BYM-1.2/NOPB requirements.
6.How does Aetrix verify that LM285BYM-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285BYM-1.2/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-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM285BYM-1.2/NOPB?
All LM285BYM-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285BYM-1.2/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-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM285BYM-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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