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Texas Instruments LM285BXMX-1.2/NOPB
- Part No.:
- LM285BXMX-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285BXMX-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,099
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Product details
Overview
LM285BXMX-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, 1 Ω dynamic impedance, and operation across 10 μA–20 mA current range. It serves as a stable low-voltage reference in battery-powered instrumentation, portable meters, and micropower regulators where long shelf-life operation is critical.
For engineers reviewing the LM285BXMX-1.2/NOPB datasheet, LM285BXMX-1.2/NOPB pinout, LM285BXMX-1.2/NOPB application, or LM285BXMX-1.2/NOPB equivalent, key selection criteria include temperature coefficient (30 ppm/°C for X-suffix), SOIC-8 package compatibility, −40°C to +85°C operating range, and verified performance under capacitive loading without instability.
Technical Context
The LM285BXMX-1.2/NOPB implements a band-gap reference architecture using on-chip trimmed transistors and resistors to achieve low noise (60 μVrms, 10 Hz–10 kHz) and excellent long-term stability (20 ppm over 1000 hours). Its two-terminal configuration simplifies layout and eliminates external biasing components.
Designed for wide-current operation, it maintains regulation from 10 μA up to 20 mA-enabling direct use with high-impedance sources or low-dropout regulator feedback networks. The X-suffix variant specifies 30 ppm/°C average temperature coefficient, validated across −40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; tight tolerance enables precision analog signal conditioning without trimming. |
| Initial Tolerance | ±1% at 25°C; reduces calibration burden in production test for portable measurement devices. |
| Operating Current | 10 μA to 20 mA; supports ultra-low-power sensor interfaces and high-current reference buffering. |
| Dynamic Impedance | 1 Ω at 100 μA; ensures minimal load-induced voltage shift in varying current conditions. |
| Temp Coefficient | 30 ppm/°C (X-suffix); guarantees ≤1.05 mV drift over full −40°C to +85°C range. |
| Long-Term Stability | 20 ppm over 1000 hours; supports reliable operation in unattended field-deployed equipment. |
| Wideband Noise | 60 μVrms (10 Hz–10 kHz); suitable for high-resolution ADC references without added filtering. |
Pinout & Package
LM285BXMX-1.2/NOPB is housed in an 8-pin SOIC (Package Drawing D) with standard pinout per TI's SOIC-8 mechanical specification. Pin 1 is index-marked; pins 1–4 and 5–8 form opposing dual rows. The device operates as a 2-terminal reference: Anode (Pin 1) and Cathode (Pin 8) are functional terminals; all other pins are internally connected to cathode or unused.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Input terminal for reverse-bias current; connects to system ground or low-side current sink. |
| Pin 8 | Cathode | Output terminal; provides regulated 1.235 V referenced to anode potential. |
| Pins 2–7 | Internally tied to Cathode or NC | No external connection required; improves thermal dissipation and ESD robustness in SOIC package. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥1 μF output capacitance-eliminates need for series isolation resistor in battery-monitoring circuits. |
| Micropower Operation | 10 μA minimum operating current enables multi-year operation from coin cells in IoT endpoint sensors. |
| Low Dynamic Impedance | 1 Ω ensures <1 mV output variation when load current changes by 1 mA-critical for precision DAC buffers. |
| Tight Temperature Drift | 30 ppm/°C (X-suffix) limits error to ±0.11 mV over industrial temperature range-validates use in calibrated thermistor bridges. |
| On-Chip Trimmed Accuracy | ±1% initial tolerance achieved via laser trimming-reduces post-assembly calibration steps in medical handhelds. |
Applications
| Battery-Powered Multimeter | Micropower Sensor Signal Chain |
|---|---|
|
Use Scenario: Portable handheld multimeter measuring DC voltage with 0.1% accuracy over 0–10 V range. IC Role / Device Role / Timing Role: Primary 1.235 V reference for 16-bit SAR ADC and auto-ranging attenuator calibration. Use Value: Enables single-cell alkaline operation (1.5 V supply) while maintaining full-scale accuracy across temperature and battery discharge. |
Use Scenario: Low-power environmental sensor node logging temperature/humidity with 12-bit resolution. IC Role / Device Role / Timing Role: Stable excitation reference for ratiometric bridge measurements and ADC reference input. Use Value: Delivers 20 ppm/1000 hr stability and 60 μVrms noise-preserving measurement integrity without periodic recalibration. |
| Portable Medical Glucometer | Industrial Loop-Powered Transmitter |
|
Use Scenario: Battery-operated blood glucose meter requiring FDA-grade accuracy and shelf life >2 years. IC Role / Device Role / Timing Role: Precision reference for electrochemical current-to-voltage conversion and analog front-end gain setting. Use Value: ±1% initial tolerance and 30 ppm/°C drift meet ISO 15197:2013 accuracy requirements for Class A devices. |
Use Scenario: 4–20 mA loop transmitter powered from 12–36 V supply in hazardous-area process control. IC Role / Device Role / Timing Role: Low-drift reference for current-loop DAC and sensor linearization circuitry. Use Value: 1 Ω dynamic impedance prevents loop current error during fast sensor response transients in PID control loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BXMX-1.2/NOPB | Same 1.235 V reference, but rated for 0°C to 70°C only; 20 ppm/°C tempco option available. | Suitable for commercial-grade consumer electronics, not industrial ambient environments. | Select when cost sensitivity outweighs extended temperature range requirement. |
| REF3012AIDBZR | 1.2 V output, ±0.2% initial accuracy, 50 ppm/°C max, SOT-23-3 package, 50 μA typical quiescent current. | Higher accuracy but higher min operating current; requires PCB redesign due to 3-pin SOT-23 footprint. | Choose for tighter tolerance needs where board space permits SOT-23 and power budget allows 50 μA. |
Compared with LM385BXMX-1.2/NOPB and REF3012AIDBZR, the LM285BXMX-1.2/NOPB uniquely balances industrial temperature range (−40°C to +85°C), SOIC-8 manufacturability, and true micropower capability (10 μA min), making it optimal for ruggedized portable instrumentation where layout reuse and battery longevity are primary constraints.
Availability
LM285BXMX-1.2/NOPB is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical diagnostics, and industrial loop-powered transmitters requiring stable component supply with RoHS-compliant, lead-free packaging and traceable lot control.
Supply support for LM285BXMX-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 reference design and high-reliability manufacturing.
The LM285 family was engineered specifically for micropower, low-drift voltage referencing in portable and battery-constrained systems-prioritizing long-term stability, capacitive-load immunity, and wide operating current range over speed or integration.
FAQ
What is the exact reference voltage and tolerance of LM285BXMX-1.2/NOPB?
The LM285BXMX-1.2/NOPB delivers a nominal reference voltage of 1.235 V with ±1% initial tolerance at 25°C, as specified in the Electrical Characteristics table of the SNVS742E datasheet. This tolerance is guaranteed across the full −40°C to +85°C operating range for the X-suffix grade, enabling predictable performance in industrial portable equipment without post-manufacture trimming.
Does LM285BXMX-1.2/NOPB require external capacitors for stability?
No, the LM285BXMX-1.2/NOPB is explicitly designed to be stable with large capacitive loads-up to and beyond 1 μF-without oscillation or phase margin degradation. This eliminates the need for series isolation resistors or external compensation networks, simplifying design in battery-powered applications like handheld meters where board space and component count are constrained.
What is the temperature coefficient of LM285BXMX-1.2/NOPB and how is it verified?
The LM285BXMX-1.2/NOPB carries the X-suffix, specifying a maximum average temperature coefficient of 30 ppm/°C, measured across the full −40°C to +85°C operating range. This value is derived from the maximum deviation of output voltage at all tested temperatures divided by the temperature span, per the definition in the datasheet's Electrical Characteristics section.
Can LM285BXMX-1.2/NOPB operate from a 1.5 V alkaline battery?
Yes, the LM285BXMX-1.2/NOPB functions reliably down to 10 μA operating current and exhibits no dropout behavior-it regulates correctly as long as the applied reverse voltage exceeds the reference voltage plus diode drop (typically ~1.4 V total). In practice, it sustains stable 1.235 V output even as a fresh 1.5 V alkaline cell discharges to ~1.3 V, supporting multi-year operation in low-duty-cycle sensor nodes.
How does the SOIC-8 package of LM285BXMX-1.2/NOPB differ electrically from TO-92 versions?
The SOIC-8 package of LM285BXMX-1.2/NOPB offers identical electrical specifications-including reference voltage, tolerance, temperature coefficient, and dynamic impedance-as TO-92 variants like LM285BXZ-1.2/NOPB. The only differences are thermal resistance (θJA = 165°C/W vs. 440°C/W) and pin configuration: SOIC-8 uses Pins 1 (Anode) and 8 (Cathode), while TO-92 uses Leads 1 and 3 per bottom-view diagram.
LM285BXMX-1.2/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):
- 1.235V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 30ppm/°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
LM285BXMX-1.2/NOPB FAQ
1.How can I place an order for LM285BXMX-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285BXMX-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 LM285BXMX-1.2/NOPB reliable?
The price and inventory of LM285BXMX-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 LM285BXMX-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM285BXMX-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285BXMX-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285BXMX-1.2/NOPB?
LM285BXMX-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285BXMX-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 LM285BXMX-1.2/NOPB?
For technical support, including LM285BXMX-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285BXMX-1.2/NOPB requirements.
6.How does Aetrix verify that LM285BXMX-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285BXMX-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 LM285BXMX-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM285BXMX-1.2/NOPB?
All LM285BXMX-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285BXMX-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 LM285BXMX-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM285BXMX-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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