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Texas Instruments LM285M-2.5/NOPB
- Part No.:
- LM285M-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285M-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,183
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Product details
Overview
LM285M-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, 0.6 Ω dynamic impedance, and operation over 20 μA–20 mA current range. It serves as a stable reference in portable meters, battery-powered analog circuits, and low-power regulators where long shelf-life battery operation is critical.
For engineers reviewing the LM285M-2.5/NOPB datasheet, LM285M-2.5/NOPB pinout, LM285M-2.5/NOPB application, or LM285M-2.5/NOPB equivalent, key selection criteria include its −40°C to +85°C operating temperature range, SOIC-8 package compatibility, low 150 ppm/°C temperature coefficient (standard grade), and verified performance under capacitive loading without instability.
Technical Context
The LM285M-2.5/NOPB implements a two-terminal band-gap architecture using only transistors and resistors-enabling low noise, excellent long-term stability (20 ppm after 1000 hours), and immunity to capacitive loading effects. Its on-chip trimming ensures tight initial voltage accuracy without external calibration.
It operates as a shunt reference: reverse-biased across a current-setting resistor, regulating voltage by sinking variable current while maintaining 2.5 V across its terminals. The SOIC-8 package supports surface-mount assembly with JEDEC MS-012 compliance and Level-1 MSL rating for lead-free reflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±20 mV at 25°C - ensures precision ADC/DAC biasing and sensor excitation within 0.8% error budget |
| Operating Current Range | 20 μA to 20 mA - enables use from ultra-low-power IoT sensors to higher-current analog front-ends without redesign |
| Dynamic Impedance | 0.6 Ω at 100 μA - minimizes output voltage shift under load transients, critical for high-resolution measurement systems |
| Temperature Coefficient | 150 ppm/°C (standard grade) - limits drift to ±12.5 mV over −40°C to +85°C, suitable for industrial-grade instrumentation |
| Wideband Noise (10 Hz–10 kHz) | 120 μVrms - preserves signal integrity in low-noise amplifiers and precision data acquisition |
| Long-Term Stability | 20 ppm after 1000 hours - reduces recalibration frequency in field-deployed test equipment and medical devices |
Pinout & Package
LM285M-2.5/NOPB is housed in an 8-pin SOIC package (Package Drawing D0008A) with standard JEDEC MS-012, 1.75 mm max height, and RoHS-compliant matte tin (Sn) lead finish. Pin 1 is marked by a notch or beveled corner; pins are numbered counterclockwise from pin 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Input) | Connects to current-setting resistor; reverse-biased terminal sourcing current into device |
| Pin 2 | Cathode (Output) | Provides regulated 2.5 V reference; connects to load and feedback node of regulator or ADC reference input |
| Pins 3–8 | No Connect / Thermal Pad | Internally unconnected; electrically isolated but thermally coupled to die for improved thermal dissipation in SOIC-8 |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with unlimited capacitive loading - eliminates need for series isolation resistor in battery-monitoring circuits |
| Micropower Operation | 20 μA minimum operating current - extends battery life in portable multimeters and handheld calibrators beyond shelf life |
| Hermetic Alternative Available | LM285BXZ-2.5/NOPB (TO-92) offers same electrical specs with through-hole reliability for harsh environments |
| Low Dynamic Impedance | 0.6 Ω at 100 μA - maintains regulation during fast load steps in precision DAC buffers and sensor signal chains |
| ESD Robustness | 2 kV HBM rating - withstands handling in standard lab and production environments without special precautions |
Applications
| Portable Digital Multimeter | Battery-Powered Data Logger |
|---|---|
|
Use Scenario: High-impedance 3½-digit DMM measuring DC voltage with auto-ranging and <100 μA standby current. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.5 V for ADC reference and internal scaling circuitry. Use Value: Enables ±0.8% full-scale accuracy over temperature and battery discharge, eliminating periodic recalibration. |
Use Scenario: Remote environmental sensor node logging temperature/humidity every 5 minutes using coin-cell battery. IC Role / Device Role / Timing Role: Precision reference for low-power SAR ADC and analog front-end conditioning. Use Value: 20 μA minimum operating current allows >5-year battery life; low noise prevents quantization errors in sub-mV signals. |
| Industrial Process Transmitter | Calibration Equipment |
|
Use Scenario: 4–20 mA loop-powered transmitter with onboard microcontroller and analog sensor interface. IC Role / Device Role / Timing Role: Reference source for current-loop DAC and sensor excitation voltage. Use Value: 150 ppm/°C TC and 20 ppm long-term drift ensure <0.1% total error over 10-year field deployment. |
Use Scenario: Benchtop calibrator generating precise 2.5 V, 5 V, and 10 V outputs for instrument verification. IC Role / Device Role / Timing Role: Primary reference element in micropower 5 V and 10 V derived references (Fig. 17–18). Use Value: Verified stability under varying load currents (20 μA–20 mA) enables accurate programmable output without gain/offset drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385M-2.5/NOPB | Same 2.5 V reference, but rated for 0°C to 70°C only; identical SOIC-8 package and pinout | Suitable for commercial-grade consumer electronics, not industrial or extended-temperature designs | Select when ambient operating temperature remains within 0–70°C and cost sensitivity outweighs temperature margin |
| LM285Z-2.5/NOPB | Same electrical specs, TO-92 package (3-pin), through-hole mounting, −40°C to +85°C rating | Preferred for prototyping, repair, or legacy PCBs requiring axial-leaded components | Choose for manual assembly, thermal mass requirements, or compatibility with existing TO-92 footprints |
Compared with LM385M-2.5/NOPB, LM285M-2.5/NOPB provides broader industrial temperature coverage; compared with LM285Z-2.5/NOPB, it offers superior board-level density and automated assembly compatibility while retaining identical electrical behavior.
Availability
LM285M-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and industrial process transmitters requiring stable component supply with guaranteed long-term continuity.
Supply support for LM285M-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 power management solutions.
The LM285 series belongs to TI's micropower voltage reference product line, engineered specifically for battery-critical and low-drift applications where regulation stability, low noise, and wide operating current range are essential.
FAQ
What is the maximum reverse current rating for LM285M-2.5/NOPB?
The absolute maximum reverse current for LM285M-2.5/NOPB is 30 mA. Exceeding this value risks permanent damage. For reliable operation, maintain current within the specified 20 μA–20 mA functional range, with typical design margins keeping peak current below 15 mA to ensure thermal safety in SOIC-8 packaging.
Does LM285M-2.5/NOPB require an external capacitor for stability?
No, LM285M-2.5/NOPB is explicitly designed to be stable with unlimited capacitive loading-no external capacitor is required. This eliminates phase-margin concerns and simplifies layout in space-constrained applications like handheld test equipment and wearable sensors where LM285M-2.5/NOPB is commonly deployed.
Can LM285M-2.5/NOPB be used as a 1.2 V reference?
No, LM285M-2.5/NOPB is a fixed 2.5 V reference only. For 1.2 V operation, TI offers the LM185-1.2 series (e.g., LM185M-1.2/NOPB), which shares the same micropower architecture and SOIC-8 package but is trimmed to 1.2 V nominal output. Substituting LM285M-2.5/NOPB for 1.2 V will result in incorrect system biasing.
What is the thermal resistance (θJA) of LM285M-2.5/NOPB in SOIC-8 package?
The junction-to-ambient thermal resistance (θJA) for LM285M-2.5/NOPB in SOIC-8 package is 165°C/W under standard JEDEC test conditions (2s2 pad, 1 oz copper). At 20 mA operating current and 2.5 V drop, power dissipation is 50 mW, resulting in ~8.3°C junction rise above ambient-well within safe limits for −40°C to +85°C operation.
Is LM285M-2.5/NOPB pin-compatible with LM385M-2.5/NOPB?
Yes, LM285M-2.5/NOPB and LM385M-2.5/NOPB share identical SOIC-8 package (D0008A), pinout, and terminal functions. However, they differ in temperature rating: LM285M-2.5/NOPB operates from −40°C to +85°C, while LM385M-2.5/NOPB is limited to 0°C to +70°C. Electrical specs are otherwise matched per datasheet tables.
LM285M-2.5/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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1.5%
- Temperature Coefficient:
- 150ppm/°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
LM285M-2.5/NOPB FAQ
1.How can I place an order for LM285M-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285M-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 LM285M-2.5/NOPB reliable?
The price and inventory of LM285M-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 LM285M-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM285M-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285M-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285M-2.5/NOPB?
LM285M-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285M-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 LM285M-2.5/NOPB?
For technical support, including LM285M-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285M-2.5/NOPB requirements.
6.How does Aetrix verify that LM285M-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285M-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 LM285M-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM285M-2.5/NOPB?
All LM285M-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285M-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 LM285M-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM285M-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM285M-2.5/NOPB Tags
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