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Texas Instruments LM285BYMX-1.2/NOPB
- Part No.:
- LM285BYMX-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285BYMX-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,292
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Product details
Overview
LM285BYMX-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-grade), 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 and low-power regulators.
For engineers reviewing the LM285BYMX-1.2/NOPB datasheet, LM285BYMX-1.2/NOPB pinout, LM285BYMX-1.2/NOPB application, or LM285BYMX-1.2/NOPB equivalent, key selection criteria include its tight initial tolerance, ultra-low quiescent current capability (down to 10 μA), low noise (60 μVrms), long-term stability (20 ppm/1000 hr), and compatibility with capacitive loading without oscillation.
Technical Context
The LM285BYMX-1.2/NOPB implements a two-terminal band-gap reference architecture using on-chip trimmed transistors and resistors, enabling low-noise operation and excellent long-term stability. Its design eliminates need for external biasing components and supports direct connection to high-impedance loads.
It features wide dynamic operating range (10 μA to 20 mA), making it suitable for both micropower systems (e.g., 1.5 V battery references) and higher-current applications (e.g., 5 V regulator feedback). The Y-grade variant specifies 50 ppm/°C average temperature coefficient and ±1% initial voltage tolerance at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; tight regulation enables accurate ADC/DAC biasing and sensor excitation in low-voltage systems. |
| Initial Tolerance | ±1% at 25°C; reduces calibration burden in production test and field-deployed instrumentation. |
| Temp Coefficient | 50 ppm/°C (Y-grade); ensures <±3 mV drift over −40°C to +85°C, critical for unregulated battery supplies. |
| Dynamic Impedance | 1 Ω at 100 μA; maintains stable output under varying load conditions without external compensation. |
| Operating Current | 10 μA to 20 mA; supports micropower designs (e.g., 9 V battery life approaching shelf life) and robust industrial sensing. |
| Wideband Noise | 60 μVrms (10 Hz–10 kHz); minimizes error in precision measurement front-ends and low-level signal conditioning. |
| Long-Term Stability | 20 ppm over 1000 hours; ensures reference integrity in mission-critical monitoring and calibration equipment. |
Pinout & Package
LM285BYMX-1.2/NOPB is housed in an 8-pin SOIC package (Package Drawing D, JEDEC MS-012 variation AA), 3.91 mm × 4.90 mm footprint, 1.75 mm max height, RoHS-compliant, with Sn lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connects to system ground or lower potential node; reverse-biased operation requires current sourcing into this terminal. |
| Pin 2 | Cathode | Provides regulated 1.235 V output; connects to load or feedback network; must be decoupled with ≥0.1 μF ceramic capacitor for stability. |
| Pins 3–8 | No Connect / Die Attach Pad | Internally tied to die attach pad; TI recommends connecting Pin 3 to Pin 2 or leaving floating per datasheet Figure 3; no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥0.1 μF ceramic output capacitance-eliminates need for series resistance or complex compensation in portable designs. |
| Micropower Operation | Functional down to 10 μA supply current-enables multi-year battery life in wireless sensors and handheld test gear. |
| Low Dynamic Impedance | 1 Ω at 100 μA-minimizes output voltage sag during transient load steps in precision analog signal chains. |
| On-Chip Trimmed Voltage | Factory-trimmed to ±1% at 25°C-reduces post-manufacture calibration effort in medical and industrial instrumentation. |
| Low Temperature Drift | 50 ppm/°C (Y-grade)-ensures sub-millivolt accuracy over full industrial temperature range without external compensation. |
Applications
| Battery-Powered Precision Metering | Micropower Voltage Regulator Reference |
|---|---|
|
Use Scenario: Portable multimeter measuring 0–200 mV DC with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Provides stable 1.235 V reference for ADC internal gain stage and analog front-end offset calibration. Use Value: Enables ±0.1% full-scale accuracy over battery discharge (1.5 V to 1.0 V) without recalibration due to low current sensitivity and tight tempco. |
Use Scenario: Low-quiescent LDO regulator powering microcontroller in IoT node. IC Role / Device Role / Timing Role: Serves as precision feedback reference for adjustable LDO control loop (e.g., LM2936). Use Value: Maintains ±1.5 mV output regulation across 10 μA–15 mA load while consuming only 12 μA itself-extending coin-cell lifetime by >3× vs. standard references. |
| Thermocouple Cold-Junction Compensation | Calibrated Sensor Excitation Source |
|
Use Scenario: Handheld thermocouple thermometer (Type K) operating from single 3.3 V Li-ion cell. IC Role / Device Role / Timing Role: Generates stable 1.235 V reference for op-amp-based cold-junction compensation circuit. Use Value: Delivers <±0.5°C measurement accuracy over −10°C to +60°C ambient via 50 ppm/°C tempco and 20 ppm/1000 hr stability. |
Use Scenario: 4–20 mA loop-powered pressure transmitter with silicon piezoresistive sensor. IC Role / Device Role / Timing Role: Supplies excitation voltage to Wheatstone bridge with matched tempco to minimize thermal zero drift. Use Value: Matches bridge tempco within 10 ppm/°C, reducing zero-point drift to <0.05% FS/°C-meeting IEC 61298-2 Class 0.1 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BYMX-1.2/NOPB | Same 1.235 V, ±1%, 50 ppm/°C spec; wider temp range (0°C to +70°C) and identical SOIC-8 package. | Targeted for commercial-grade systems where extended industrial temp range is not required. | Select when cost sensitivity outweighs −40°C operation; shares same layout and BOM except for temp screening. |
| REF3012AIDBZR | 1.2 V output, ±0.2% initial tolerance, 50 ppm/°C, 50 μA typical IQ, SOT-23-3 package. | Higher accuracy and lower noise (35 μVrms) but requires 3-pin configuration and external bypass. | Choose for metrology-grade accuracy where board space permits SOT-23 and additional decoupling. |
Compared with LM285BYMX-1.2/NOPB, LM385BYMX-1.2/NOPB offers identical electrical performance at lower cost for commercial environments, while REF3012AIDBZR delivers tighter tolerance and lower noise in a smaller 3-pin package-but demands more careful layout and lacks inherent capacitive-load immunity.
Availability
LM285BYMX-1.2/NOPB is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial sensor interfaces, and portable medical devices requiring stable component supply with guaranteed long-term continuity.
Supply support for LM285BYMX-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 power management technologies with over 50 years of innovation in precision analog ICs.
The LM285 series belongs to TI's legacy micropower voltage reference family, designed specifically for low-current, high-stability applications in portable, battery-operated, and industrial measurement systems where minimal self-heating and long-term drift are critical.
FAQ
What is the operating temperature range for LM285BYMX-1.2/NOPB?
The LM285BYMX-1.2/NOPB is rated for operation from −40°C to +85°C. This industrial temperature range is confirmed in the SNVS742E datasheet Section "Description" and Package Option Addendum, distinguishing it from the LM185 (−55°C to +125°C) and LM385 (0°C to +70°C) variants. The SOIC-8 package supports reliable thermal performance within this range.
Does LM285BYMX-1.2/NOPB require external capacitors for stability?
LM285BYMX-1.2/NOPB is exceptionally tolerant of capacitive loading and remains stable with ≥0.1 μF ceramic output capacitance-no series resistor or additional compensation is needed. This behavior is explicitly stated in the datasheet "Features" and "Description" sections and validated in Figure 15 (Micropower Reference from 9V Battery), where a 0.1 μF capacitor is used directly at the cathode.
What does the "Y" suffix indicate in LM285BYMX-1.2/NOPB?
The "Y" suffix denotes the temperature coefficient grade: 50 ppm/°C maximum average TC over the full operating range. Per Electrical Characteristics table, LM285BYMX-1.2/NOPB is tested to this limit, unlike "X" (30 ppm/°C) or unspecified grades (150 ppm/°C). This grade directly impacts system-level accuracy in temperature-varying environments.
Can LM285BYMX-1.2/NOPB replace LM285BXMX-1.2/NOPB in existing designs?
Yes-LM285BYMX-1.2/NOPB is a direct functional upgrade to LM285BXMX-1.2/NOPB, sharing identical SOIC-8 package, pinout, and operating current range. The "Y" grade improves temperature coefficient from 150 ppm/°C to 50 ppm/°C while maintaining ±1% initial tolerance, enabling immediate drop-in use where enhanced thermal stability is required.
What is the maximum reverse current rating for LM285BYMX-1.2/NOPB?
The absolute maximum reverse current for LM285BYMX-1.2/NOPB is 30 mA, as specified in the "Absolute Maximum Ratings" table of SNVS742E. Exceeding this value risks permanent damage. For reliable operation, the recommended operating current range remains 10 μA to 20 mA per the Electrical Characteristics table.
LM285BYMX-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:
- 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
LM285BYMX-1.2/NOPB FAQ
1.How can I place an order for LM285BYMX-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285BYMX-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 LM285BYMX-1.2/NOPB reliable?
The price and inventory of LM285BYMX-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 LM285BYMX-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM285BYMX-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285BYMX-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285BYMX-1.2/NOPB?
LM285BYMX-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285BYMX-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 LM285BYMX-1.2/NOPB?
For technical support, including LM285BYMX-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285BYMX-1.2/NOPB requirements.
6.How does Aetrix verify that LM285BYMX-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285BYMX-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 LM285BYMX-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM285BYMX-1.2/NOPB?
All LM285BYMX-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285BYMX-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 LM285BYMX-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM285BYMX-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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