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Texas Instruments LM285BXM-1.2/NOPB
- Part No.:
- LM285BXM-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285BXM-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,040
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Product details
Overview
LM285BXM-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 30 ppm/°C temperature coefficient across −40°C to +85°C. It operates over a wide 10 μA–20 mA current range and enables ultra-low-power applications such as portable battery-powered meters and precision current sources.
For engineers reviewing the LM285BXM-1.2/NOPB datasheet, LM285BXM-1.2/NOPB pinout, LM285BXM-1.2/NOPB application, or LM285BXM-1.2/NOPB equivalent, key selection criteria include its SOIC-8 package compatibility, tight initial accuracy, low quiescent current (≤30 μA in typical reference circuits), and proven stability under capacitive loading-critical for high-precision analog front-ends and sensor signal conditioning.
Technical Context
The LM285BXM-1.2/NOPB uses a band-gap reference architecture with on-chip trimming to achieve ±1% initial voltage accuracy at 25°C and maintains regulation across a 10 μA–20 mA operating current range. Its 1 Ω dynamic impedance ensures minimal output deviation under load transients.
Designed for micropower systems, it exhibits low wideband noise (60 μVrms, 10 Hz–10 kHz) and long-term stability of 20 ppm over 1000 hours. The device is rated for −40°C to +85°C operation and features built-in ESD protection (2 kV HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; tight ±1% initial tolerance enables direct use in 12-bit ADC references without calibration. |
| Initial Tolerance | ±1% at 25°C; eliminates need for external trimming in portable instrumentation and battery-monitoring circuits. |
| Operating Current | 10 μA to 20 mA; supports both ultra-low-power (e.g., 1.5 V battery) and higher-current regulator feedback paths. |
| Dynamic Impedance | 1 Ω at 100 μA; ensures stable output under varying load conditions, critical for precision current-source topologies. |
| Temp. Coefficient | 30 ppm/°C (X-suffix); guarantees ≤1.2 mV drift over full −40°C to +85°C range in industrial sensor interfaces. |
| Long-Term Stability | 20 ppm over 1000 hours; reduces recalibration frequency in field-deployed measurement equipment. |
Pinout & Package
LM285BXM-1.2/NOPB is housed in an 8-pin SOIC (Package Drawing D) with standard pinout per TI's SOIC-8 layout. Pin 1 is index-marked; pins 1–4 and 5–8 form two symmetrical rows. The device is a 2-terminal reference: only Anode (Pin 1) and Cathode (Pin 8) are electrically active; all other pins are NC (no connect) and internally unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Current entry point; connects to ground or low-side current source in shunt reference configuration. |
| Pin 8 | Cathode | Reference output node; provides stable 1.235 V relative to Anode; requires no external bias resistor when used with active current source. |
| Pins 2–7 | No Connect (NC) | Internally unconnected; must remain floating-no PCB routing or grounding permitted to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥1 μF output capacitance-enables direct decoupling in noisy environments without oscillation risk. |
| Micropower Operation | Supports 10 μA minimum operating current-extends shelf life in battery-powered devices like handheld multimeters. |
| Low Noise Performance | 60 μVrms (10 Hz–10 kHz)-minimizes error in high-resolution data acquisition and thermocouple cold-junction compensation. |
| Wide Current Range | 10 μA–20 mA operation-allows reuse across low-power sensor nodes and higher-current voltage monitor circuits. |
| Hermetic Alternative Available | TO-package variants (e.g., LM285BXZ-1.2/NOPB) offer enhanced reliability for extended-temperature or harsh-environment deployments. |
Applications
| Portable Battery-Powered Meters | Precision Current Sources |
|---|---|
|
Use Scenario: Handheld digital multimeters and portable pH meters powered by single 1.5 V or 9 V batteries. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation and ADC reference for analog front-end. Use Value: Enables >12-bit effective resolution with <30 μA total supply current, extending battery life to months on alkaline cells. |
Use Scenario: Programmable 1 μA–1 mA current sources for RTD or thermistor biasing in industrial sensors. IC Role / Device Role / Timing Role: Precision voltage setpoint driving op-amp-based Howland or Wilson current mirrors. Use Value: Delivers <0.1% current accuracy over temperature due to 30 ppm/°C TC and 1 Ω dynamic impedance. |
| Thermocouple Cold-Junction Compensation | Micropower Voltage Regulators |
|
Use Scenario: Embedded temperature measurement systems using J/K/T-type thermocouples in HVAC or process control. IC Role / Device Role / Timing Role: Reference for cold-junction temperature sensing circuitry (e.g., Figure 25). Use Value: Low noise and long-term stability ensure <0.5°C absolute accuracy over 5-year field deployment. |
Use Scenario: Standby power rails in IoT edge nodes requiring regulated 1.2 V or 2.5 V from 3.3 V main supply. IC Role / Device Role / Timing Role: Shunt reference element in low-quiescent-current LDO feedback divider. Use Value: Supports <10 μA regulator quiescent current while maintaining ±1% output accuracy across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BXM-1.2/NOPB | Same 1.235 V reference, but rated for 0°C to 70°C; ±1% tolerance; SOIC-8 package. | Targeted at commercial-grade applications (e.g., consumer electronics) where extended temperature range is unnecessary. | Select when ambient operating temperature stays within 0°C–70°C and cost sensitivity outweighs industrial temp range needs. |
| LM285BXZ-1.2/NOPB | Identical electrical specs, but TO-92 (LP) 3-pin package; Anode/Cathode on Pins 1/3; Pin 2 NC. | Suitable for through-hole prototyping, legacy board upgrades, or space-constrained designs needing axial lead form factor. | Choose for manual assembly, thermal mass requirements, or compatibility with existing TO-92 footprints. |
Compared with LM385BXM-1.2/NOPB, the LM285BXM-1.2/NOPB offers broader industrial temperature support (−40°C to +85°C vs. 0°C–70°C); compared with LM285BXZ-1.2/NOPB, it delivers superior PCB area efficiency and reflow compatibility in automated SMT lines-making it optimal for new industrial sensor modules.
Availability
LM285BXM-1.2/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, precision sensor interfaces, and micropower regulator designs requiring stable component supply with guaranteed long-term availability.
Supply support for LM285BXM-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 series belongs to TI's micropower voltage reference product line, engineered specifically for battery-critical and high-accuracy analog systems where low drift, low noise, and wide operating current range are essential.
FAQ
What is the exact reference voltage and tolerance of LM285BXM-1.2/NOPB?
The LM285BXM-1.2/NOPB delivers a nominal reference voltage of 1.235 V with ±1% initial tolerance at 25°C, verified across production lots per TI's SNVS742E datasheet. This specification applies directly to the LM285BXM-1.2/NOPB variant and enables direct use in 12-bit measurement systems without post-production calibration.
Does LM285BXM-1.2/NOPB require an external current-setting resistor?
Yes-LM285BXM-1.2/NOPB is a 2-terminal shunt reference and requires an external current-setting resistor between the supply rail and the Cathode (Pin 8). The resistor value is calculated based on desired operating current (10 μA–20 mA) and supply voltage minus 1.235 V, as shown in TI's Figure 14 and Figure 15 application schematics.
Can LM285BXM-1.2/NOPB be used with large output capacitors?
Yes-LM285BXM-1.2/NOPB is explicitly designed for exceptional capacitive load tolerance, remaining stable with ≥1 μF ceramic or tantalum output capacitance. This capability is confirmed in the "Features" section and Figure 12 (Filtered Output Noise) of the SNVS742E datasheet, making it ideal for noisy industrial power rails.
What is the maximum operating temperature range for LM285BXM-1.2/NOPB?
The LM285BXM-1.2/NOPB is rated for continuous operation from −40°C to +85°C, as specified in the "Absolute Maximum Ratings" table and "Description" section of the TI SNVS742E datasheet. This industrial temperature grade distinguishes it from the commercial LM385BXM-1.2/NOPB (0°C–70°C) and military LM185 variants.
Is LM285BXM-1.2/NOPB RoHS compliant and lead-free?
Yes-LM285BXM-1.2/NOPB carries the "/NOPB" suffix, indicating TI's Green (RoHS-compliant, Pb-free, and halogen-free) packaging. Its lead finish is matte tin (SN), moisture sensitivity level is Level-1 (unlimited floor life at ≤30°C/60% RH), and it conforms to JEDEC J-STD-020 standards per the TI Package Option Addendum.
LM285BXM-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:
- 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
LM285BXM-1.2/NOPB FAQ
1.How can I place an order for LM285BXM-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285BXM-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 LM285BXM-1.2/NOPB reliable?
The price and inventory of LM285BXM-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 LM285BXM-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM285BXM-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285BXM-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285BXM-1.2/NOPB?
LM285BXM-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285BXM-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 LM285BXM-1.2/NOPB?
For technical support, including LM285BXM-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285BXM-1.2/NOPB requirements.
6.How does Aetrix verify that LM285BXM-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285BXM-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 LM285BXM-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM285BXM-1.2/NOPB?
All LM285BXM-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285BXM-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 LM285BXM-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM285BXM-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM285BXM-1.2/NOPB Tags
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