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Texas Instruments LM385BMX-2.5
- Part No.:
- LM385BMX-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385BMX-2.5.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,546
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Product details
Overview
LM385BMX-2.5 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 30 ppm/°C average temperature coefficient across 0°C to 70°C. It operates over a 20 μA to 20 mA current range and is used in portable meters, battery-powered analog circuitry, and precision current sources where low quiescent current and long-term stability are critical.
For engineers reviewing the LM385BMX-2.5 datasheet, LM385BMX-2.5 pinout, LM385BMX-2.5 application, or LM385BMX-2.5 equivalent, key selection considerations include its SOIC-8 package, 2.5 V reference accuracy at microamp-level operating current, thermal drift performance within commercial temperature range, and compatibility with capacitive loads up to 10 μF without instability.
Technical Context
The LM385BMX-2.5 implements a two-terminal band-gap reference architecture using on-chip trimmed resistors and transistors to achieve tight voltage tolerance and low noise. Its design eliminates the need for external biasing components and supports direct connection as a shunt reference in series with a current-setting resistor.
It features exceptionally low dynamic impedance (0.6 Ω at 100 μA, 20 Hz), wideband noise of 120 μVrms (10 Hz–10 kHz), and long-term stability of 20 ppm over 1000 hours-enabling high-accuracy calibration and low-drift sensor signal conditioning in resource-constrained systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±20 mV (±0.8%) at 25°C; ensures accurate ADC/DAC biasing and sensor excitation |
| Operating Current Range | 20 μA to 20 mA; supports ultra-low-power standby modes and higher-drive applications without redesign |
| Dynamic Impedance | 0.6 Ω at 100 μA, 20 Hz; minimizes output voltage shift under load transients |
| Temp. Coefficient | 30 ppm/°C (X suffix); guarantees ≤0.75 mV drift over full 0°C–70°C operating range |
| Reverse Voltage Change | ≤2.5 mV from 20 μA to 1 mA; enables stable regulation even with varying supply or load conditions |
| Long-Term Stability | 20 ppm over 1000 hours; reduces recalibration frequency in field-deployed instrumentation |
Pinout & Package
LM385BMX-2.5 is housed in an 8-pin SOIC package (Package Drawing D0008A) with 1.27 mm lead pitch, 3.90 mm body width, and 1.75 mm max height. 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 (Cathode Input) | Current sink node; connects to regulated output node via series resistor |
| Pin 2 | Cathode (Anode Output) | 2.5 V reference output; requires low-ESR bypass capacitor for stability |
| Pins 3–8 | No Connect / Internally Unused | Not bonded; electrically isolated and must remain unconnected per TI design |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥10 μF ceramic output capacitance-eliminates need for series resistance in battery-powered designs |
| Micropower Operation | 20 μA minimum operating current extends shelf life of battery-operated equipment (e.g., handheld multimeters) |
| Low Noise Performance | 120 μVrms broadband noise (10 Hz–10 kHz) preserves SNR in precision analog front-ends |
| Hermetic Stability | On-chip trimming and band-gap topology deliver <20 ppm/1000 hr aging-critical for calibration-grade references |
Applications
| Portable Digital Multimeter | Industrial Temperature Transmitter |
|---|---|
Use Scenario: Battery-powered handheld DMM requiring 3.5-digit accuracy and >500-hour battery life. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.5 V reference for 12-bit SAR ADC and LCD bias generation. Use Value: 20 μA operating current enables multi-year operation on a single 9 V alkaline cell; ±0.8% initial tolerance meets Class II meter accuracy standards. | Use Scenario: 4–20 mA loop-powered RTD transmitter operating in 0°C–100°C ambient. IC Role / Device Role / Timing Role: Precision 2.5 V reference for excitation current source and ratiometric ADC reference in analog signal chain. Use Value: 30 ppm/°C tempco ensures <0.1°C measurement error over full industrial temperature range; SOIC package supports automated assembly. |
| Calibration Standard for Sensor Modules | Micropower Data Logger Reference |
Use Scenario: Factory calibration fixture for thermocouple and pressure sensor modules. IC Role / Device Role / Timing Role: Primary voltage standard used to adjust zero and span of analog output stages before shipment. Use Value: 20 ppm/1000 hr long-term stability allows quarterly recalibration intervals; ±20 mV tolerance enables pass/fail testing without external metrology. | Use Scenario: Solar-powered environmental logger sampling temperature/humidity every 10 minutes. IC Role / Device Role / Timing Role: Low-drift reference for microcontroller's internal ADC and external op-amp signal conditioning. Use Value: 20 μA min current permits operation directly from supercapacitor storage; 0.6 Ω dynamic impedance prevents reading errors during burst-mode sampling. |
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, identical electrical specs, but supplied in tube (95 pcs) vs. tape-and-reel (2500 pcs) | Preferred for prototyping or low-volume production where reel handling is unnecessary | Select when small-batch evaluation or manual assembly is required |
| LM385BXMX-2.5/NOPB | Identical electrical and mechanical specifications; same marking "385BX M2.5" and temperature grade (0°C–70°C) | No functional difference; alternate reel packaging SKU with same TI factory traceability | Choose based on logistics preference-both meet identical production release criteria |
Compared with LM385BXM-2.5/NOPB and LM385BXMX-2.5/NOPB, the LM385BMX-2.5/NOPB offers identical reference performance and SOIC-8 footprint but is optimized for high-volume SMT line integration via 2500-piece tape-and-reel delivery, reducing feeder changeovers and improving placement yield.
Availability
LM385BMX-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, calibration fixtures, and micropower data loggers requiring stable component supply and consistent parametric performance across production lots.
Supply support for LM385BMX-2.5 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and power management solutions.
The LM385 family was designed specifically for micropower, high-stability voltage reference applications in battery-operated and industrial measurement systems-emphasizing low drift, wide current range, and robust capacitive load immunity.
FAQ
What is the operating temperature range for LM385BMX-2.5?
The LM385BMX-2.5 is rated for operation from 0°C to 70°C, matching the commercial temperature grade of the LM385 series. This range is confirmed in TI's SNVS743D datasheet and Package Option Addendum, and applies to all SOIC-packaged LM385 variants including LM385BMX-2.5/NOPB. Operation outside this range may result in degraded accuracy or reliability.
Does LM385BMX-2.5 require an external capacitor for stability?
No, the LM385BMX-2.5 is explicitly designed to be stable with capacitive loads up to 10 μF, as stated in the TI datasheet's FEATURES section. Unlike many shunt references, it does not require a series resistor or damping capacitor-enabling direct connection to large bypass caps for improved noise rejection in sensitive analog circuits.
What is the meaning of the 'BM' suffix in LM385BMX-2.5?
The 'BM' suffix in LM385BMX-2.5 indicates the device belongs to the LM385-B grade (±20 mV initial tolerance) and is packaged in SOIC (D package). The 'M' denotes tube or tape-and-reel packaging, and 'X' specifies tape-and-reel format (2500 pcs/reel), per TI's official Package Option Addendum dated 30-Apr-2024.
Can LM385BMX-2.5 replace LM385M-2.5 in an existing design?
Yes, LM385BMX-2.5 can replace LM385M-2.5 in most cases: both are SOIC-8, 2.5 V references with identical pinout and 0°C–70°C rating. However, LM385BMX-2.5 has tighter ±20 mV (±0.8%) initial tolerance versus LM385M-2.5's looser ±50 mV spec, offering improved accuracy without layout changes.
What is the maximum reverse current rating for LM385BMX-2.5?
The absolute maximum reverse current for LM385BMX-2.5 is 30 mA, as specified in the Absolute Maximum Ratings table of the SNVS743D datasheet. Exceeding this value risks permanent damage. For reliable operation, the recommended operating current remains 20 μA to 20 mA per Electrical Characteristics.
LM385BMX-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM385BMX-2.5 FAQ
1.How can I place an order for LM385BMX-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BMX-2.5 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 LM385BMX-2.5 reliable?
The price and inventory of LM385BMX-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM385BMX-2.5 is usually 5 days.
3.What payment methods are accepted for LM385BMX-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BMX-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BMX-2.5?
LM385BMX-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BMX-2.5 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 LM385BMX-2.5?
For technical support, including LM385BMX-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BMX-2.5 requirements.
6.How does Aetrix verify that LM385BMX-2.5 is sourced from the original manufacturer or authorized distributors?
All LM385BMX-2.5 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 LM385BMX-2.5 meets industry standards.
7.What is the process for return or replacement of LM385BMX-2.5?
All LM385BMX-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM385BMX-2.5, 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 LM385BMX-2.5 part is unused and in its original packaging.
Return procedure for LM385BMX-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM385BMX-2.5 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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