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Texas Instruments LM285MX-1.2/NOPB
- Part No.:
- LM285MX-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285MX-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,918
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Product details
Overview
LM285MX-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 over 10 μA–20 mA current range. It serves as a low-drift, low-noise reference in battery-powered analog circuits, portable meters, and precision current sources.
For engineers reviewing the LM285MX-1.2/NOPB datasheet, LM285MX-1.2/NOPB pinout, LM285MX-1.2/NOPB application, or LM285MX-1.2/NOPB equivalent, key selection criteria include temperature coefficient (30 ppm/°C for X-suffix), operating temperature range (−40°C to +85°C), SOIC-8 package compatibility, and micropower performance down to 10 μA.
Technical Context
The LM285MX-1.2/NOPB implements a band-gap reference architecture using on-chip trimmed transistors and resistors, enabling low noise (60 μVrms, 10 Hz–10 kHz) and excellent long-term stability (20 ppm/1000 hr). Its 2-terminal configuration simplifies integration into bias networks and current-source topologies without external feedback.
Designed for capacitive loading tolerance, it maintains regulation across widely varying supply conditions and supports direct use in wide-input-range references and micropower regulators-evidenced by typical applications including 1.5 V battery references and 0°C–100°C thermometers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; tight initial tolerance (±1%) enables high-accuracy calibration without trimming. |
| Initial Tolerance | ±1% (X-suffix); ensures minimal system-level offset error in precision analog signal chains. |
| Operating Current Range | 10 μA to 20 mA; supports ultra-low-power sensor interfaces and high-current reference buffering. |
| Dynamic Impedance | 1 Ω at 100 μA; provides stable regulation under load transients and minimizes output voltage droop. |
| Temperature Coefficient | 30 ppm/°C (X-suffix); guarantees ≤0.37 mV drift over −40°C to +85°C for industrial-grade accuracy. |
| Long-Term Stability | 20 ppm/1000 hr; ensures consistent reference performance in deployed instrumentation and metering systems. |
Pinout & Package
LM285MX-1.2/NOPB is housed in an 8-pin SOIC (Package Drawing D) with gull-wing leads. Pin 1 is index-marked; pins 1–4 and 5–8 form two isolated terminal pairs for dual-reference or series-connected configurations. The device operates as a 2-terminal device: terminals are Pin 1 (Anode) and Pin 8 (Cathode).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Current entry point; connects to lower-potential node (e.g., ground or negative rail) in reverse-biased reference operation. |
| Pin 8 | Cathode | Reference output node; delivers regulated 1.235 V when reverse-biased at ≥10 μA. |
| Pins 2–7 | No-connect (NC) | Internally unconnected; must remain floating per datasheet to avoid parasitic leakage or thermal coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive loading tolerance | Stable with >10 μF output capacitance-enables direct decoupling without phase-compensation networks. |
| Micropower operation | Functional down to 10 μA-extends battery life in portable multimeters and remote sensors beyond shelf-life limits. |
| Low dynamic impedance | 1 Ω at 100 μA-minimizes output voltage variation during load switching in precision DAC buffers. |
| On-chip trimming | Factory-trimmed band-gap core-eliminates need for external calibration in production test fixtures. |
| Wide temperature range | Rated −40°C to +85°C-supports deployment in automotive cabin electronics and industrial PLC I/O modules. |
Applications
| Portable Multimeter Reference | Precision Current Source |
|---|---|
Use Scenario: Used in handheld digital multimeters to establish accurate DC voltage and current measurement baselines. IC Role / Device Role / Timing Role: 2-terminal voltage reference providing stable 1.235 V reference for ADC reference input and shunt calibration. Use Value: ±1% initial tolerance and 30 ppm/°C TC ensure <0.1% full-scale error across operating temperature without recalibration. | Use Scenario: Configured in constant-current sink topology for sensor excitation (e.g., RTD, strain gauge bridges). IC Role / Device Role / Timing Role: Precision voltage source driving known resistor to generate 1 μA–1 mA programmable currents. Use Value: 1 Ω dynamic impedance and 60 μVrms noise maintain current accuracy to ±0.05% in low-noise bridge measurements. |
| Low-Voltage Battery Monitor | Thermometer Front-End |
Use Scenario: Supplies reference for comparator-based battery voltage detection in 1.5 V alkaline-powered devices. IC Role / Device Role / Timing Role: Micropower reference enabling wake-up circuitry that draws <20 μA total quiescent current. Use Value: Operation down to 10 μA allows reliable 1.235 V reference generation even at end-of-life battery voltages (~1.3 V). | Use Scenario: Core reference in centigrade thermometer designs (0°C–100°C) using thermistor or thermocouple compensation. IC Role / Device Role / Timing Role: Stable voltage source for Kelvin-temperature scaling (1 mV/K) and cold-junction compensation. Use Value: 20 ppm/1000 hr long-term stability prevents calibration drift in field-deployed environmental monitoring units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385MX-1.2/NOPB | Same 1.235 V reference, but rated for 0°C to 70°C; 20 ppm/°C TC (Y-suffix) or 150 ppm/°C (standard). | Intended for commercial-grade equipment; not qualified for extended industrial temperature operation. | Select when cost sensitivity outweighs temperature range requirements and ambient stays within 0°C–70°C. |
| REF3012AIDBZR | 1.2 V output, ±0.2% initial accuracy, 50 ppm/°C TC, 50 μA quiescent current, SOT-23-3 package. | Higher accuracy and lower TC than LM285MX-1.2/NOPB, but requires 50 μA minimum supply current. | Choose for higher-precision, lower-drift applications where board space is constrained and 50 μA supply is acceptable. |
Compared with LM385MX-1.2/NOPB, the LM285MX-1.2/NOPB offers wider temperature qualification (−40°C to +85°C vs. 0°C to 70°C) and tighter TC option (30 ppm/°C), while REF3012AIDBZR trades micropower capability for superior accuracy and smaller footprint-making each suitable for distinct design priorities: ruggedness, commercial cost, or precision density.
Availability
LM285MX-1.2/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and battery-powered metering systems requiring stable component supply with RoHS-compliant, lead-free packaging.
Supply support for LM285MX-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.
The LM285MX-1.2/NOPB belongs to TI's micropower voltage reference family, engineered for ultra-low-current, high-stability operation in portable and energy-constrained systems.
FAQ
What is the exact reference voltage and tolerance of LM285MX-1.2/NOPB?
The LM285MX-1.2/NOPB delivers a nominal reference voltage of 1.235 V with ±1% initial tolerance at 25°C. This specification is guaranteed for the X-suffix variant and applies across its full operating current range (10 μA to 20 mA), making LM285MX-1.2/NOPB suitable for applications demanding factory-calibrated accuracy without post-assembly trimming.
Can LM285MX-1.2/NOPB operate from a 1.5 V battery?
Yes, LM285MX-1.2/NOPB can operate from a 1.5 V battery. Its minimum operating current is 10 μA, and the device functions reliably down to ~1.3 V forward headroom-confirmed in Figure 16 ("Micropower Reference from 1.5V Battery") of the official datasheet. This makes LM285MX-1.2/NOPB ideal for single-cell alkaline or lithium primary battery systems.
What is the temperature coefficient of LM285MX-1.2/NOPB and how does it affect accuracy?
The LM285MX-1.2/NOPB carries an X-suffix indicating a maximum average temperature coefficient of 30 ppm/°C. Over its −40°C to +85°C operating range, this translates to a worst-case drift of ±3.75 mV (±0.3% of 1.235 V), ensuring predictable, bounded error in industrial environments without active compensation.
Is LM285MX-1.2/NOPB pin-compatible with other members of the LMx85 family?
No-LM285MX-1.2/NOPB uses an 8-pin SOIC package with internal NC pins, whereas LM285Z-1.2/NOPB (TO-92) and LM285M-1.2/NOPB (SOIC-8 with different pin mapping) have distinct pinouts. The SOIC-8 variant LM285MX-1.2/NOPB is not pin-compatible with LM385MX-1.2/NOPB despite identical package outline; both require verification against their respective connection diagrams before PCB reuse.
Does LM285MX-1.2/NOPB require external capacitors for stability?
No, LM285MX-1.2/NOPB is explicitly designed for exceptional capacitive loading tolerance and remains stable with output capacitances exceeding 10 μF-unlike many older references. The datasheet confirms "exceptionally tolerant of capacitive loading," eliminating the need for series resistance or external compensation networks in most applications involving ceramic or tantalum bypass caps.
LM285MX-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:
- 150ppm/°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
LM285MX-1.2/NOPB FAQ
1.How can I place an order for LM285MX-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285MX-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 LM285MX-1.2/NOPB reliable?
The price and inventory of LM285MX-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 LM285MX-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM285MX-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285MX-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285MX-1.2/NOPB?
LM285MX-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285MX-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 LM285MX-1.2/NOPB?
For technical support, including LM285MX-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285MX-1.2/NOPB requirements.
6.How does Aetrix verify that LM285MX-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285MX-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 LM285MX-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM285MX-1.2/NOPB?
All LM285MX-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285MX-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 LM285MX-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM285MX-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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