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Texas Instruments LM385BXMX-2.5/NOPB
- Part No.:
- LM385BXMX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385BXMX-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,039
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Product details
Overview
LM385BXMX-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 supply current. It serves as a stable reference in portable meters, battery-powered analog circuitry, and precision current sources where low power and temperature stability are critical.
For engineers reviewing the LM385BXMX-2.5/NOPB datasheet, LM385BXMX-2.5/NOPB pinout, LM385BXMX-2.5/NOPB application, or LM385BXMX-2.5/NOPB equivalent, key selection factors include its 0°C to 70°C operating range, SOIC-8 package, 30 ppm/°C temperature coefficient (X suffix), and compatibility with capacitive loads up to 10 nF without instability.
Technical Context
The LM385BXMX-2.5/NOPB uses on-chip trimming for tight voltage tolerance and relies solely on transistors and resistors-enabling low noise (120 μV rms, 10 Hz–10 kHz) and excellent long-term stability (20 ppm over 1000 hours). Its 2-terminal architecture simplifies layout and eliminates external bias components.
Designed for micropower systems, it achieves stable regulation across a wide 20 μA–20 mA operating current range and exhibits exceptional tolerance to capacitive loading-making it suitable for direct connection to ADC reference inputs or op-amp feedback networks without compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±20 mV at 25°C - ensures accurate 2.5 V reference for 12-bit ADCs and precision comparators |
| Initial Tolerance | ±0.8% (A grade) - reduces calibration overhead in production test fixtures |
| Operating Current | 20 μA to 20 mA - supports ultra-low-power sleep modes and high-current reference buffering |
| Dynamic Impedance | 0.6 Ω at 100 μA - minimizes output voltage shift under transient load changes |
| Temp Coefficient | 30 ppm/°C (X suffix) - limits drift to ±2.1 mV over 0°C–70°C ambient range |
| Long-Term Stability | 20 ppm over 1000 hours - maintains accuracy in sealed industrial sensors without field recalibration |
| Wideband Noise | 120 μV rms (10 Hz–10 kHz) - avoids noise-induced errors in high-resolution data acquisition |
Pinout & Package
LM385BXMX-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) with standard JEDEC MS-012AA footprint. Pin 1 is marked by a notch or dot; pins 1–4 and 5–8 form two opposing rows.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Input) | Connects to unregulated supply; reverse-biased during normal operation as a 2-terminal shunt reference |
| Pin 2 | Cathode (Output) | Provides regulated 2.5 V reference; must be decoupled with ≥10 nF capacitor for stability |
| Pins 3–8 | No Connect (NC) | Internally unused; electrically isolated and may be left floating or tied to ground per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥10 nF output capacitance - eliminates need for series isolation resistor in ADC reference paths |
| Micropower Operation | 20 μA minimum operating current - enables multi-year battery life in portable gas sensors and IoT nodes |
| Low Dynamic Impedance | 0.6 Ω - suppresses supply ripple coupling into precision analog signal chains |
| Tight Initial Tolerance | ±20 mV (±0.8%) - reduces or eliminates post-manufacture trimming in medical instrumentation |
| Hermetic Stability | 20 ppm long-term drift - ensures calibration integrity in sealed environmental monitoring modules |
Applications
| Portable Multimeter Reference | Industrial Temperature Sensor Calibration |
|---|---|
Use Scenario: Battery-powered handheld multimeter requiring stable 2.5 V reference for 16-bit SAR ADC. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation and scaling for precision resistor ladder and input attenuator network. Use Value: 30 ppm/°C tempco and 20 μA min current enable >1000-hour runtime on AA cells while maintaining ±0.05% full-scale accuracy. |
Use Scenario: RTD-based temperature transmitter deployed in factory automation cabinets (0°C–70°C ambient). IC Role / Device Role / Timing Role: Precision reference for constant-current source driving 4-wire Pt100 sensor and ratiometric ADC conversion. Use Value: 0.6 Ω dynamic impedance prevents gain error drift under varying cable capacitance and EMI exposure. |
| Micropower Data Logger | Calibration Standard for Field Instruments |
Use Scenario: Solar-charged environmental logger sampling soil moisture every 15 minutes using ultra-low-quiescent LDOs. IC Role / Device Role / Timing Role: Primary reference for both analog front-end and internal DAC used in self-test routines. Use Value: 120 μV rms noise floor preserves resolution in 24-bit sigma-delta measurements without additional filtering. |
Use Scenario: Benchtop calibrator verifying accuracy of pressure transducers and flow meters in metrology labs. IC Role / Device Role / Timing Role: Stable 2.5 V node for generating traceable 10 V and 5 V outputs via precision resistor dividers. Use Value: ±20 mV initial tolerance and 20 ppm/1000-hr stability meet ISO/IEC 17025 requirements for secondary standards. |
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 and 0°C–70°C rating, but B grade (±50 mV initial tolerance, 50 ppm/°C tempco) | Lower accuracy; suitable for non-critical biasing or coarse calibration where cost is prioritized | Select when ±1% system accuracy suffices and budget constraints preclude A-grade parts |
| REF3025AIDBZR | 3-pin SOT-23, 2.5 V, ±0.2% initial tolerance, 50 ppm/°C, 50 μA typical quiescent current | Higher accuracy and lower tempco, but requires external bypass capacitor and occupies less board area | Choose for space-constrained designs needing tighter tolerance, accepting higher IQ and 3-pin interface complexity |
Compared with LM385BXM-2.5/NOPB, LM385BXMX-2.5/NOPB delivers tighter initial tolerance and lower tempco at identical price and package-making it preferable for calibrated instruments. Versus REF3025AIDBZR, it offers simpler 2-terminal operation and lower IQ but trades off absolute accuracy and modern packaging.
Availability
LM385BXMX-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor modules, and battery-powered data loggers requiring stable component supply across extended production lifecycles.
Supply support for LM385BXMX-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 decades of leadership in precision analog ICs.
The LM385 family was designed specifically for micropower, high-stability voltage referencing in portable and industrial measurement systems-emphasizing low IQ, robust capacitive loading immunity, and long-term reliability without external components.
FAQ
What is the operating temperature range for LM385BXMX-2.5/NOPB?
The LM385BXMX-2.5/NOPB is rated for operation from 0°C to 70°C ambient temperature. This commercial-grade range aligns with its intended use in consumer-grade instrumentation, industrial control modules, and battery-powered equipment-not aerospace or extended-temperature automotive applications. The device's thermal resistance (θJA = 165°C/W) supports this range in standard SOIC PCB layouts with moderate copper pour.
Does LM385BXMX-2.5/NOPB require an external current-limiting resistor?
Yes-LM385BXMX-2.5/NOPB is a 2-terminal shunt reference and must be used with an external series resistor between the unregulated supply and Pin 1 (Anode). This resistor sets the operating current within the specified 20 μA–20 mA range. For example, with a 5 V supply and target 100 μA current, a 25 kΩ resistor yields 2.5 V at Pin 2 (Cathode) and 100 μA through LM385BXMX-2.5/NOPB.
Can LM385BXMX-2.5/NOPB drive capacitive loads directly?
Yes-LM385BXMX-2.5/NOPB is explicitly designed for exceptional capacitive load tolerance. It remains stable with output capacitances ≥10 nF, enabling direct connection to ADC reference inputs, op-amp feedback nodes, or microcontroller VREF pins without series isolation resistors or ferrite beads-unlike many older bandgap references that oscillate under similar conditions.
What does the "X" suffix indicate in LM385BXMX-2.5/NOPB?
The "X" suffix in LM385BXMX-2.5/NOPB denotes the temperature coefficient grade: 30 ppm/°C maximum average drift over the full 0°C–70°C operating range. This is tighter than the "Y" grade (50 ppm/°C) and significantly better than standard grade (150 ppm/°C), making it suitable for applications demanding predictable, low-drift performance without active temperature compensation.
Is LM385BXMX-2.5/NOPB RoHS compliant and lead-free?
Yes-LM385BXMX-2.5/NOPB is RoHS compliant and lead-free, with Sn (tin) lead finish per TI's packaging documentation. It carries the "/NOPB" suffix confirming compliance with EU RoHS Directive 2011/65/EU and meets JS709B low-halogen requirements (<1000 ppm Br+Cl). MSL Level-1 rating confirms unlimited floor life at ≤30°C/60% RH.
LM385BXMX-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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM385BXMX-2.5/NOPB FAQ
1.How can I place an order for LM385BXMX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BXMX-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 LM385BXMX-2.5/NOPB reliable?
The price and inventory of LM385BXMX-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 LM385BXMX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM385BXMX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BXMX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BXMX-2.5/NOPB?
LM385BXMX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BXMX-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 LM385BXMX-2.5/NOPB?
For technical support, including LM385BXMX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BXMX-2.5/NOPB requirements.
6.How does Aetrix verify that LM385BXMX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385BXMX-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 LM385BXMX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM385BXMX-2.5/NOPB?
All LM385BXMX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385BXMX-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 LM385BXMX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM385BXMX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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