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Texas Instruments LM385M-2.5/NOPB
- Part No.:
- LM385M-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385M-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 3% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,379
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Product details
Overview
LM385M-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 (A grade), and operation over 20 μA–20 mA current range. It serves as a stable reference in portable meters, battery-powered analog circuits, and precision current sources where low quiescent current and temperature stability are critical.
For engineers reviewing the LM385M-2.5/NOPB datasheet, LM385M-2.5/NOPB pinout, LM385M-2.5/NOPB application, or LM385M-2.5/NOPB equivalent, key selection considerations include its SOIC-8 package, 0°C to 70°C operating temperature range, 30 ppm/°C average temperature coefficient (X suffix), 120 μV wideband noise (10 Hz–10 kHz), and compatibility with capacitive loads up to 10 μF without instability.
Technical Context
The LM385M-2.5/NOPB uses on-chip trimming for tight voltage tolerance and relies solely on transistors and resistors-enabling low noise and excellent long-term stability. Its band-gap architecture provides predictable temperature behavior across its full operating range.
It operates as a 2-terminal device requiring only reverse-bias current flow (20 μA to 20 mA) to regulate output voltage, with minimal dependence on supply variations. The SOIC-8 package supports surface-mount assembly and thermal performance characterized by θJA = 165°C/W.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±20 mV (±0.8%) at 100 μA - ensures accurate ADC/DAC biasing and sensor excitation |
| Operating Current Range | 20 μA to 20 mA - enables use in ultra-low-power standby and higher-current regulation modes |
| Dynamic Impedance | 0.6 Ω (A grade, at 100 μA, f = 20 Hz) - maintains voltage stability under load transients |
| Temp Coefficient | 30 ppm/°C (X suffix) - limits drift to ≤2.25 mV over 0°C–70°C ambient range |
| Wideband Noise | 120 μVrms (10 Hz–10 kHz) - suitable for high-resolution measurement front-ends |
| Long-Term Stability | 20 ppm (1000 hr at 25°C) - supports calibration-critical instrumentation with infrequent recalibration |
Pinout & Package
LM385M-2.5/NOPB is housed in an 8-pin SOIC package (Package Drawing D0008A, 3.90 mm × 4.90 mm × 1.75 mm max height). Pin 1 is marked via notch or bevel; pins 1–4 and 5–8 form two opposing rows. The device is a 2-terminal reference: only two pins are electrically active.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Current Sink Input | Reverse-biased terminal accepting regulated current; connects to system ground or current-setting resistor |
| Pin 2 (Cathode) | Reference Output | Provides stable 2.5 V output; must be decoupled with ≥0.1 μF capacitor for stability |
| Pins 3–8 | No Connect (NC) | Internally unconnected; no electrical function - must remain floating per TI specification |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with up to 10 μF output capacitance - eliminates need for external isolation components in battery-powered systems |
| Micropower Operation | 20 μA minimum operating current - extends shelf-life-equivalent battery life in portable instruments |
| Hermetic Alternative Available | LM185-2.5-N variant offers −55°C to +125°C operation in TO package - enables drop-in upgrade for extended temp applications |
| Low-Noise Architecture | 120 μVrms noise floor - preserves signal integrity in precision thermocouple cold-junction compensation |
Applications
| Portable Digital Multimeter | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Battery-powered handheld DMM requiring stable reference for 4½-digit ADC conversion over varying battery voltage (6–9 V). IC Role / Device Role / Timing Role: 2-terminal shunt reference providing 2.5 V基准 for ADC internal reference and analog front-end gain calibration. Use Value: 20 μA minimum operating current enables >1-year battery life; ±20 mV tolerance ensures <0.1% measurement error at full scale. | Use Scenario: 4–20 mA loop-powered pressure transmitter with onboard microcontroller and analog sensor interface. IC Role / Device Role / Timing Role: Precision voltage reference for ratiometric excitation of bridge sensors and ADC reference input. Use Value: 30 ppm/°C tempco limits sensor offset drift to <0.02% FS over 0°C–70°C ambient; SOIC-8 allows automated PCB assembly. |
| Micropower Thermocouple Compensator | Calibration Equipment Reference |
Use Scenario: Low-power handheld thermometer using Type-K thermocouple with cold-junction compensation circuit. IC Role / Device Role / Timing Role: Stable 2.5 V reference setting current source for thermistor-based cold-junction sensing network. Use Value: 120 μV noise floor prevents degradation of sub-millivolt thermocouple signals; 20–20 mA operating range accommodates variable sensor bias currents. | Use Scenario: Benchtop calibration standard requiring traceable, stable voltage for calibrating multimeters and data loggers. IC Role / Device Role / Timing Role: Primary reference element in programmable current source generating precision 1 μA–1 mA outputs. Use Value: 20 ppm long-term stability supports annual calibration intervals; ±20 mV initial tolerance meets Class 0.05 accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BXM-2.5/NOPB | Same SOIC-8 package, same 2.5 V nominal output, but B-grade (±50 mV initial tolerance, 50 ppm/°C tempco) | Lower accuracy; suitable for cost-sensitive industrial controls where ±0.2% reference error is acceptable | Select when tighter tolerance is not required and budget constraints dominate |
| REF3025AIDBZR | 3-pin SOT-23, 2.5 V, ±0.2% initial tolerance, 50 ppm/°C, 50 μA typical IQ - higher accuracy but higher quiescent current | Requires external bypass capacitor and separate ground pin; not pin-compatible; better for high-precision, non-micropower designs | Choose when improved accuracy and lower tempco outweigh micropower advantage and 2-terminal simplicity |
Compared with LM385BXM-2.5/NOPB, the LM385M-2.5/NOPB delivers tighter initial tolerance and lower tempco for higher measurement fidelity; versus REF3025AIDBZR, it offers true 2-terminal simplicity and lower IQ but trades off absolute accuracy and ground-referenced noise immunity.
Availability
LM385M-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and calibration equipment requiring stable component supply, RoHS-compliant packaging, and consistent SOIC-8 tape-and-reel delivery.
Supply support for LM385M-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, embedded processing, and digital signal technologies with over 90 years of innovation in precision analog ICs.
The LM385 series belongs to TI's micropower voltage reference product line, designed specifically for battery-operated test equipment, portable medical devices, and industrial sensors demanding ultra-low IQ, robust capacitive-load stability, and long-term calibration retention.
FAQ
What is the operating temperature range for LM385M-2.5/NOPB?
The LM385M-2.5/NOPB is rated for operation from 0°C to 70°C ambient temperature. This commercial-grade range aligns with its SOIC-8 packaging and target applications in portable and industrial instrumentation where extended temperature capability is not required. For wider ranges, consider LM285-2.5-N (−40°C to +85°C) or LM185-2.5-N (−55°C to +125°C).
How many pins of LM385M-2.5/NOPB are electrically active?
Only two pins of the LM385M-2.5/NOPB are electrically active: Pin 1 (anode) and Pin 2 (cathode). Pins 3 through 8 are No Connect (NC) and must remain unconnected per TI's datasheet guidance. This 2-terminal configuration simplifies layout and eliminates ground-path errors common in 3-terminal references.
Can LM385M-2.5/NOPB drive a 1 μF output capacitor?
Yes, the LM385M-2.5/NOPB is explicitly designed for exceptional capacitive loading tolerance and remains stable with output capacitances up to 10 μF. A 1 μF ceramic capacitor is commonly used for high-frequency decoupling and is fully supported without external series resistance or isolation components.
What does the "M" suffix indicate in LM385M-2.5/NOPB?
The "M" suffix in LM385M-2.5/NOPB denotes the SOIC-8 package variant (Package Drawing D) and confirms the device is part of the commercial-temperature LM385 family (0°C to 70°C). It is distinct from "Z" (TO-92), "M3" (SOT-23), and "BM" (SOIC with B-grade tolerance), and carries the A-grade 2.5 V reference specification.
Is LM385M-2.5/NOPB RoHS compliant and lead-free?
Yes, LM385M-2.5/NOPB is RoHS compliant and lead-free, with Sn (tin) lead finish per TI's packaging documentation. It meets JEDEC Level-1 moisture sensitivity rating and is qualified for lead-free reflow soldering at peak temperatures up to 260°C, making it suitable for modern automated assembly processes.
LM385M-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:
- ±3%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 120µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 20 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM385M-2.5/NOPB FAQ
1.How can I place an order for LM385M-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385M-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 LM385M-2.5/NOPB reliable?
The price and inventory of LM385M-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 LM385M-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM385M-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385M-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385M-2.5/NOPB?
LM385M-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385M-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 LM385M-2.5/NOPB?
For technical support, including LM385M-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385M-2.5/NOPB requirements.
6.How does Aetrix verify that LM385M-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385M-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 LM385M-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM385M-2.5/NOPB?
All LM385M-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385M-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 LM385M-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM385M-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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