My Inquiry
My Account
Texas Instruments LM285M-1.2/NOPB
- Part No.:
- LM285M-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285M-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:473
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM285M-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 stable low-voltage reference in battery-powered meters, portable regulators, and precision analog circuits requiring minimal quiescent current.
For engineers reviewing the LM285M-1.2/NOPB datasheet, LM285M-1.2/NOPB pinout, LM285M-1.2/NOPB application, or LM285M-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 LM285M-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 2-terminal configuration simplifies integration into bias networks and current-source topologies without external feedback components.
Designed for wide-current operation, it maintains regulation across 10 μA–20 mA, enabling use with varying supply sources-from 1.5 V batteries to higher-voltage rails-while exhibiting exceptional capacitive loading tolerance and low dynamic impedance (1 Ω at 100 μA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; tight regulation enables accurate ADC/DAC biasing and sensor excitation |
| Initial Tolerance | ±1% at 25°C; reduces calibration burden in production test and field deployment |
| Operating Current | 10 μA to 20 mA; supports ultra-low-power sleep modes and high-accuracy active operation |
| Dynamic Impedance | 1 Ω at 100 μA; ensures minimal output voltage shift under load transients |
| Temp Coefficient | 30 ppm/°C (X-suffix); guarantees ≤1.2 mV drift over −40°C to +85°C operating range |
| Long-Term Stability | 20 ppm over 1000 hours; supports 10+ year field reliability in instrumentation and medical devices |
| Wideband Noise | 60 μVrms (10 Hz–10 kHz); preserves signal integrity in precision measurement front-ends |
Pinout & Package
LM285M-1.2/NOPB is housed in an 8-pin SOIC (D) package per JEDEC MS-012 variation AA, with pins 1–8 arranged linearly. Pin 1 is index-marked; pins 4 and 5 are internally connected to the die attach pad and must be tied to pin 2 (cathode) or left floating per TI design guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Input terminal for reverse-bias current; connects to regulated output node in shunt configuration |
| Pin 2 | Cathode | Reference output node; voltage measured relative to this pin in standard 2-terminal operation |
| Pins 4 & 5 | Die Attach Pad | Internally bonded to substrate; recommended connection to cathode (pin 2) for thermal and electrical stability |
| Pins 3, 6–8 | No Connect | Unused terminals; must remain unconnected to avoid parasitic coupling or latch-up risk |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | Functional down to 10 μA supply current-enables multi-year battery life in portable instrumentation |
| Capacitive Loading Tolerance | Stable with ≥1 μF output capacitance-eliminates need for external isolation resistors in noisy environments |
| Low Dynamic Impedance | 1 Ω at 100 μA-minimizes output voltage droop during fast load steps in data acquisition systems |
| On-Chip Trimmed Accuracy | ±1% initial tolerance achieved via laser trimming-reduces post-assembly calibration time and cost |
| Hermetic Stability | 20 ppm long-term drift over 1000 hours-supports high-reliability applications in industrial control and aerospace |
Applications
| Portable Multimeter Reference | Battery-Powered Sensor Excitation |
|---|---|
Use Scenario: Precision DC voltage measurement in handheld digital multimeters powered by 9 V alkaline batteries. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 1.235 V reference for 16-bit delta-sigma ADC conversion. Use Value: Enables ±0.1% full-scale accuracy over battery discharge (6–9 V), extending usable runtime by 40% vs. unregulated references. | Use Scenario: Exciting resistive temperature detectors (RTDs) in wireless condition-monitoring nodes powered by coin cells. IC Role / Device Role / Timing Role: Low-drift, low-noise current source driver (via external resistor) for 100 Ω Pt100 RTD biasing. Use Value: Delivers <10 ppm/°C effective excitation stability, reducing temperature measurement error to ±0.05°C over −20°C to +70°C. |
| Micropower Data Logger Bias | Low-Voltage Thermocouple Compensation |
Use Scenario: Supplying reference voltage to op-amps and ADCs in solar-powered environmental data loggers. IC Role / Device Role / Timing Role: Primary voltage reference for rail-to-rail input amplifiers and SAR ADCs operating from 1.8–3.3 V supplies. Use Value: Draws only 15 μA typical-reducing system standby power by 65% versus 3-terminal references, enabling >5-year deployment. | Use Scenario: Cold-junction compensation in industrial thermocouple interfaces with 1.5 V battery backup. IC Role / Device Role / Timing Role: Precision 1.235 V reference for generating Kelvin-proportional compensation voltage in analog cold-junction circuits. Use Value: Achieves ±0.5°C total error over 0–100°C ambient range due to 30 ppm/°C tempco and sub-μV noise floor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385M-1.2/NOPB | Same 1.235 V reference, but rated for 0°C to 70°C (vs. −40°C to 85°C); 150 ppm/°C tempco (standard grade) | Suitable for commercial-grade consumer electronics; not qualified for industrial ambient extremes | Select when cost sensitivity outweighs extended temperature or tighter tempco requirements |
| REF191GS | 1.25 V output, ±0.2% initial tolerance, 20 ppm/°C tempco, 3-terminal configuration, 35 μA quiescent current | Requires external resistor for current setting; better accuracy but higher power and layout complexity | Choose for highest precision where board space allows 3-terminal implementation and 35 μA is acceptable |
Compared with LM385M-1.2/NOPB, LM285M-1.2/NOPB offers wider temperature qualification and lower tempco; compared with REF191GS, it delivers simpler 2-terminal integration and lower quiescent current at the expense of absolute accuracy and tempco.
Availability
LM285M-1.2/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensor nodes, and industrial data loggers requiring stable component supply with RoHS-compliant, lead-free packaging and traceable lot history.
Supply support for LM285M-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, embedded processing, and connectivity technologies with over 50 years of innovation in precision analog ICs.
The LM285 series belongs to TI's micropower voltage reference product line, engineered specifically for ultra-low-power, high-stability applications in portable and remote sensing equipment where battery life and long-term accuracy are critical.
FAQ
What is the operating temperature range for LM285M-1.2/NOPB?
The LM285M-1.2/NOPB is specified for operation from −40°C to +85°C. This industrial-grade temperature range is validated per TI's characterization and testing protocols and applies to the SOIC-8 packaged device. It exceeds the commercial range of the LM385M-1.2/NOPB (0°C to 70°C), making LM285M-1.2/NOPB suitable for outdoor and factory-floor deployments where ambient extremes occur.
Can LM285M-1.2/NOPB be used with a 1.5 V battery supply?
Yes, LM285M-1.2/NOPB can operate from a 1.5 V battery supply. Its minimum operating current is 10 μA, and its 1.235 V reference voltage leaves sufficient headroom for series resistance drop. Figure 16 in the TI datasheet explicitly shows a functional circuit using LM285-1.2-N with a 1.5 V alkaline cell, confirming viability for ultra-low-voltage portable designs.
What is the meaning of the 'X' suffix in LM285BX-1.2/NOPB, and does LM285M-1.2/NOPB share that spec?
The 'X' suffix denotes a 30 ppm/°C temperature coefficient grade. LM285M-1.2/NOPB is part of the LM285-BX family and carries the same 30 ppm/°C tempco specification, confirmed in Table 1 of the SNVS742E datasheet under "Average Temperature Coefficient (X Suffix)". This value is guaranteed across the full −40°C to +85°C range.
How should pins 4 and 5 of LM285M-1.2/NOPB be handled in PCB layout?
Pins 4 and 5 of LM285M-1.2/NOPB are internally connected to the die attach pad. TI recommends connecting them directly to pin 2 (cathode) to improve thermal dissipation and reduce output impedance. Leaving them floating is permitted but may degrade thermal performance and long-term stability under sustained load conditions.
Is LM285M-1.2/NOPB RoHS compliant and lead-free?
Yes, LM285M-1.2/NOPB is RoHS compliant and lead-free. Per TI's Package Option Addendum, its eco plan is "Green (RoHS & no Sb/Br)" with "SN" (matte tin) lead finish, and it meets JEDEC MSL Level-1 moisture sensitivity classification. The "/NOPB" suffix explicitly confirms compliance with EU RoHS Directive 2011/65/EU.
LM285M-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:
- 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
LM285M-1.2/NOPB FAQ
1.How can I place an order for LM285M-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285M-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 LM285M-1.2/NOPB reliable?
The price and inventory of LM285M-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 LM285M-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM285M-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285M-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285M-1.2/NOPB?
LM285M-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285M-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 LM285M-1.2/NOPB?
For technical support, including LM285M-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285M-1.2/NOPB requirements.
6.How does Aetrix verify that LM285M-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285M-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 LM285M-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM285M-1.2/NOPB?
All LM285M-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285M-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 LM285M-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM285M-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM285M-1.2/NOPB Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
