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Texas Instruments LM285BXMX-2.5/NOPB
- Part No.:
- LM285BXMX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285BXMX-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,882
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Product details
Overview
LM285BXMX-2.5/NOPB from Texas Instruments is a micropower 2-terminal band-gap voltage reference delivering a precise 2.5 V output with ±20 mV (±0.8%) initial tolerance, 30 ppm/°C temperature coefficient, and 0.6 Ω dynamic impedance. It operates over 20 μA to 20 mA supply current and −40°C to +85°C ambient, enabling use in portable meters, battery-powered sensors, and precision analog front-ends where low quiescent current and long-term stability are critical.
For engineers reviewing the LM285BXMX-2.5/NOPB datasheet, LM285BXMX-2.5/NOPB pinout, LM285BXMX-2.5/NOPB application, or LM285BXMX-2.5/NOPB equivalent, this page provides verified package mapping (SOIC-8), confirmed electrical specs including reverse breakdown voltage, minimum operating current, dynamic impedance, temperature coefficient, and long-term stability - all validated against TI's SNVS743E revision August 2024 datasheet.
Technical Context
The LM285BXMX-2.5/NOPB implements a band-gap reference architecture using on-chip trimmed resistors and transistors to achieve tight initial accuracy and low drift. Its 2-terminal configuration simplifies integration into current-source-based biasing and feedback networks without requiring external resistors for basic operation.
Designed for micropower systems, it maintains regulation across a 1000× current range (20 μA–20 mA) while exhibiting low wideband noise (120 μV rms, 10 Hz–10 kHz) and exceptional capacitive load tolerance - eliminating need for output buffering in most applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±20 mV at 25°C; ensures accurate ADC/DAC biasing and sensor excitation within 0.8% error margin. |
| Initial Tolerance | ±20 mV (±0.8%) - A-grade specification; eliminates need for post-manufacture trimming in cost-sensitive instrumentation. |
| Temperature Coefficient | 30 ppm/°C (X suffix); guarantees ≤0.75 mV drift over −40°C to +85°C, suitable for industrial temperature monitoring. |
| Dynamic Impedance | 0.6 Ω at 100 μA; enables stable regulation under fast load transients without external compensation. |
| Operating Current Range | 20 μA to 20 mA; supports ultra-low-power sleep modes and high-accuracy active measurement simultaneously. |
| Long-Term Stability | 20 ppm (1000 hr @ 25°C); ensures calibration integrity over product lifetime in medical and test equipment. |
| Wideband Noise | 120 μV rms (10 Hz–10 kHz); preserves signal-to-noise ratio in precision data acquisition circuits. |
Pinout & Package
LM285BXMX-2.5/NOPB is packaged in an 8-pin SOIC (Package Drawing D, TI designation D0008A), 1.75 mm maximum height, RoHS-compliant with Sn finish. Pin 1 is marked by a notch or beveled corner; pins 1–4 occupy one side, 5–8 the opposite.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Input) | Connects to positive supply rail; reverse-biased during normal operation as a 2-terminal shunt reference. |
| Pin 2 | Cathode (Output/Reference) | Provides regulated 2.5 V output; must be decoupled with ≥1 μF capacitor for stability under varying loads. |
| Pins 3–8 | No Connect (NC) | Internally unconnected; no external tie required. Not electrically functional per TI SOIC-8 implementation. |
Key Features
| Feature | Design Value |
|---|---|
| 2-terminal shunt topology | Eliminates need for dedicated reference input pin; simplifies PCB layout and reduces component count in current-source configurations. |
| Capacitive load tolerance | Stable with ≥1 μF ceramic output capacitance - avoids oscillation in battery-powered systems with large bypass caps. |
| Low dynamic impedance | 0.6 Ω enables direct drive of op-amp inputs and ADC references without series resistance or buffer amplifiers. |
| Micropower operation | 20 μA minimum current allows multi-year battery life in wireless sensor nodes and portable diagnostic tools. |
| Hermetic-grade stability | On-chip trimming and band-gap design yield 20 ppm long-term drift - meets calibration requirements for Class I metrology. |
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 2.5 V reference for 16-bit delta-sigma ADC conversion. Use Value: Enables ±0.1% full-scale accuracy over battery discharge (6–9 V), with <30 μA total reference current extending shelf-life-aligned battery life. |
Use Scenario: Exciting resistive temperature detectors (RTDs) in wireless industrial temperature nodes. IC Role / Device Role / Timing Role: Low-drift 2.5 V reference for constant-current source driving 100 Ω Pt100 RTD. Use Value: 30 ppm/°C TC ensures <0.15 °C error contribution over −40°C to +85°C ambient, meeting Class B IEC 60751 requirements. |
| Calibration Equipment Offset | Micropower Data Logger Bias |
Use Scenario: Zero-offset adjustment in portable oscilloscope front-end amplifiers and calibration standards. IC Role / Device Role / Timing Role: Precision 2.5 V reference for DAC-controlled offset nulling circuitry. Use Value: 20 ppm long-term stability prevents recalibration drift beyond 1000 hours, reducing maintenance intervals in field service tools. |
Use Scenario: Supplying reference voltage to ultra-low-power SAR ADCs in environmental data loggers running on coin cells. IC Role / Device Role / Timing Role: Micropower shunt reference maintaining 2.5 V during 1-second wake-up bursts. Use Value: 20 μA minimum operating current allows >5-year operation on CR2032, with no startup delay due to inherent fast turn-on. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BXMX-2.5/NOPB | Same 2.5 V reference, but rated for 0°C to 70°C (vs. −40°C to 85°C); identical SOIC-8 package and pinout. | Not suitable for extended industrial or automotive under-hood environments requiring −40°C operation. | Select LM285BXMX-2.5/NOPB when wide temperature range is mandatory; LM385BXMX-2.5/NOPB suffices for commercial indoor use. |
| REF3025AIDBZR | 3-terminal SOT-23 device with enable pin; 2.5 V output, 50 ppm/°C TC, 22 μA typical quiescent current. | Requires external resistor for current setting; not drop-in compatible due to different topology and pin count. | Choose REF3025AIDBZR only if system-level enable control or smaller footprint justifies redesign; LM285BXMX-2.5/NOPB offers simpler 2-terminal integration. |
Compared with LM385BXMX-2.5/NOPB and REF3025AIDBZR, the LM285BXMX-2.5/NOPB uniquely delivers industrial temperature range, true 2-terminal simplicity, and sub-1 Ω dynamic impedance - making it optimal for space-constrained, battery-operated instrumentation needing guaranteed −40°C start-up and minimal BOM count.
Availability
LM285BXMX-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor nodes, and calibration equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LM285BXMX-2.5/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 analog ICs and industrial-grade reliability.
The LM285 family was designed specifically for micropower, high-stability voltage referencing in battery-critical and thermally demanding applications - emphasizing low drift, wide current range, and robustness across extended temperature grades.
FAQ
What is the operating temperature range for LM285BXMX-2.5/NOPB?
The LM285BXMX-2.5/NOPB is rated for operation from −40°C to +85°C ambient temperature, matching the LM285 grade specification. This makes it suitable for industrial control panels, outdoor sensor enclosures, and automotive cabin electronics where extended thermal performance is required - unlike the LM385 variant limited to 0°C–70°C.
Is LM285BXMX-2.5/NOPB pin-compatible with other SOIC-8 voltage references?
No - LM285BXMX-2.5/NOPB is a 2-terminal shunt reference with only Pins 1 and 2 electrically active; Pins 3–8 are NC. Most 3-terminal references (e.g., REF3025) require separate VIN, VOUT, and GND connections. Direct replacement requires verifying topology compatibility, not just pin count or package.
What is the minimum cathode current required for LM285BXMX-2.5/NOPB to regulate properly?
The LM285BXMX-2.5/NOPB requires a minimum cathode current of 20 μA to maintain regulation within specifications. Below this threshold, output voltage deviates significantly from 2.5 V; design must ensure sufficient current through the external series resistor or load path under all operating conditions.
Can LM285BXMX-2.5/NOPB drive capacitive loads directly?
Yes - the LM285BXMX-2.5/NOPB is explicitly designed for exceptional capacitive load tolerance. TI's datasheet confirms stable operation with ≥1 μF ceramic output capacitance, eliminating need for isolation resistors in battery-powered systems where large bulk capacitors are used for supply filtering.
What does the 'BX' suffix indicate in LM285BXMX-2.5/NOPB?
The 'BX' suffix denotes the A-grade initial tolerance (±20 mV) and X-grade temperature coefficient (30 ppm/°C). This combination provides tighter accuracy than standard 'M' or 'Y' variants, targeting applications requiring higher precision without external calibration - such as portable test equipment and calibrated sensor modules.
LM285BXMX-2.5/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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1.5%
- Temperature Coefficient:
- 30ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 120µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 20 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM285BXMX-2.5/NOPB FAQ
1.How can I place an order for LM285BXMX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285BXMX-2.5/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-2.5/NOPB reliable?
The price and inventory of LM285BXMX-2.5/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-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM285BXMX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285BXMX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285BXMX-2.5/NOPB?
LM285BXMX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285BXMX-2.5/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-2.5/NOPB?
For technical support, including LM285BXMX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285BXMX-2.5/NOPB requirements.
6.How does Aetrix verify that LM285BXMX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285BXMX-2.5/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-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM285BXMX-2.5/NOPB?
All LM285BXMX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285BXMX-2.5/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-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM285BXMX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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