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Texas Instruments LM385BM-2.5
- Part No.:
- LM385BM-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385BM-2.5.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,470
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Product details
Overview
LM385BM-2.5 from Texas Instruments is a micropower 2-terminal band-gap voltage reference diode delivering a precise 2.5 V output with ±20 mV (±0.8%) initial tolerance (B grade), 0.6 Ω dynamic impedance, and operation across 20 μA–20 mA current range. It serves as a stable low-power reference in battery-powered instrumentation, portable meters, and precision analog signal conditioning circuits.
For engineers reviewing the LM385BM-2.5 datasheet, LM385BM-2.5 pinout, LM385BM-2.5 application, or LM385BM-2.5 equivalent, this page provides verified specifications, SOIC-8 package details, thermal and noise performance data, and validated alternative options for industrial and embedded design reuse.
Technical Context
The LM385BM-2.5 implements a band-gap reference architecture using only transistors and resistors, enabling low noise (120 μV rms, 10 Hz–10 kHz), excellent long-term stability (20 ppm over 1000 hours), and minimal temperature drift (150 ppm/°C max). Its 2-terminal configuration simplifies integration into current-source-based biasing and regulation topologies.
Designed for the 0°C to 70°C commercial temperature range, it features on-chip trimming for tight voltage tolerance and exceptional capacitive loading tolerance-eliminating need for external compensation in most applications. Reverse dynamic impedance remains ≤0.6 Ω at 100 μA, supporting high PSRR in low-current reference paths.
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 without calibration. |
| Operating Current Range | 20 μA to 20 mA - supports ultra-low-power sleep modes and higher-drive regulator feedback loops. |
| Dynamic Impedance | 0.6 Ω at 100 μA, 20 Hz - maintains regulation stability under varying load or supply ripple conditions. |
| Temperature Coefficient | 150 ppm/°C max (B grade) - limits voltage drift to ±18.75 mV over full 0°C–70°C range. |
| Wideband Noise | 120 μV rms (10 Hz–10 kHz) - suitable for 12-bit+ precision measurement front-ends without added filtering. |
| Long-Term Stability | 20 ppm after 1000 hours - enables reliable field operation in uncalibrated portable equipment. |
Pinout & Package
LM385BM-2.5 is packaged in an 8-pin SOIC (Package Drawing D, JEDEC MS-012), with pins 1–8 arranged linearly. Pin 1 is index-marked; pins 4 and 5 are internally connected to the die attach pad (DAP) and must be tied to ground or left floating per layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Input) | Reverse-biased terminal; connects to higher-potential node in series-reference configuration. |
| Pin 2 | Cathode (Output) | Provides regulated 2.5 V reference voltage; requires external current-setting resistor. |
| Pins 3, 6, 7, 8 | No Connect (NC) | Unused internal terminals; must remain unconnected per TI design guidance. |
| Pins 4 & 5 | Die Attach Pad (DAP) | Internally tied to cathode; recommended to connect to ground plane for thermal and noise control. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | Functional down to 20 μA - extends battery life in portable multimeters and IoT sensor nodes beyond shelf life. |
| Capacitive loading tolerance | Stable with ≥10 μF output capacitance - eliminates need for isolation resistors in noisy power rail environments. |
| Low dynamic impedance | 0.6 Ω at 100 μA - improves rejection of supply ripple and load-induced voltage sag in precision references. |
| Hermetic-grade stability | 20 ppm long-term drift (1000 hr) - reduces recalibration frequency in field-deployed test equipment. |
| SOIC-8 thermal performance | θJA = 165°C/W - enables operation up to 70°C ambient without heatsinking in compact PCB layouts. |
Applications
| Portable Multimeter Reference | Low-Power Data Acquisition Bias |
|---|---|
Use Scenario: Handheld digital multimeter requiring stable 2.5 V reference for 16-bit ADC conversion across battery discharge cycle. IC Role / Device Role / Timing Role: 2-terminal shunt reference providing ratiometric accuracy independent of supply voltage variation. Use Value: Enables ±0.1% measurement accuracy over 0°C–50°C and 3.0–9.0 V battery range with <30 μA quiescent current. |
Use Scenario: Battery-powered environmental sensor node sampling temperature/humidity at 1 SPS with 12-bit resolution. IC Role / Device Role / Timing Role: Precision voltage reference for ADC reference input and sensor excitation circuitry. Use Value: Delivers 12-bit linearity (±1 LSB) while consuming only 25 μA average current during active sampling. |
| Thermocouple Cold-Junction Compensation | Micropower Adjustable Regulator Setpoint |
Use Scenario: Industrial thermocouple interface module compensating for cold-junction drift in K-type sensors. IC Role / Device Role / Timing Role: Stable 2.5 V source feeding precision current source that generates 40.8 μA/K for Seebeck coefficient matching. Use Value: Achieves ±0.5°C accuracy over −20°C to +85°C ambient with <50 μA total reference subsystem current. |
Use Scenario: Low-noise LDO regulator (e.g., TLV707) configured for 5.0 V output using external resistor divider. IC Role / Device Role / Timing Role: High-accuracy reference replacing Zener diode in feedback network to improve output tolerance and temperature drift. Use Value: Reduces LDO output error from ±3% to ±0.8% and lowers tempco from 100 ppm/°C to 35 ppm/°C. |
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 | B-grade, same 2.5 V nominal, ±20 mV tolerance, but TO-92 package (LP0003A) instead of SOIC-8. | Lower thermal resistance (283°C/W vs. 165°C/W) and no NC pins - suited for through-hole prototyping or space-constrained PCBs without surface-mount capability. | Select when mechanical mounting flexibility or legacy TO-92 footprint compatibility is required; verify thermal derating above 40°C ambient. |
| REF3025AIDBZR | 2.5 V, ±0.2% initial accuracy (A grade), 50 ppm/°C tempco, 50 μA typical quiescent current, SOT-23-3 package. | Higher accuracy and lower tempco, but higher operating current - better for 14-bit+ systems where drift dominates error budget. | Choose when system-level accuracy demands sub-0.5% total error over temperature; accept 2.5× higher supply current and different pinout. |
Compared with LM385BM-2.5, LM385BXM-2.5/NOPB offers identical electrical specs in a through-hole package for manual assembly, while REF3025AIDBZR trades micropower operation for tighter initial tolerance and lower temperature drift-making it preferable for high-resolution data acquisition where current draw is secondary to accuracy.
Availability
LM385BM-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered data loggers, and industrial sensor interfaces requiring stable component supply across extended production lifecycles.
Supply support for LM385BM-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 since the 1960s.
The LM385 family was designed for micropower, high-stability voltage referencing in portable and battery-critical applications-emphasizing low operating current, robust capacitive loading behavior, and long-term reliability without external compensation.
FAQ
What is the maximum operating current for LM385BM-2.5?
The LM385BM-2.5 supports a maximum reverse operating current of 20 mA, as specified in its absolute maximum ratings and electrical characteristics table. Exceeding this current risks thermal overstress and accelerated long-term drift. At 20 mA, power dissipation reaches 50 mW (2.5 V × 20 mA), which remains within safe SOIC-8 thermal limits at ≤70°C ambient.
Does LM385BM-2.5 require an external capacitor for stability?
No, the LM385BM-2.5 does not require an external capacitor for stability due to its inherent tolerance of capacitive loading-verified across ≥10 μF output capacitance in TI's characterization. This eliminates series isolation resistors and simplifies layout in noise-sensitive applications like portable meter front-ends.
What is the temperature range specification for LM385BM-2.5?
The LM385BM-2.5 is rated for operation from 0°C to +70°C ambient temperature, consistent with its commercial-grade LM385 designation. Its thermal resistance (θJA = 165°C/W) allows junction temperatures to remain below 100°C under typical SOIC-8 PCB copper area conditions at full 20 mA load.
How does LM385BM-2.5 differ from LM385M-2.5/NOPB?
The LM385BM-2.5/NOPB is the B-grade version (±20 mV initial tolerance), while LM385M-2.5/NOPB is the standard M-grade (±50 mV tolerance). Both share identical SOIC-8 packaging, 0°C–70°C rating, and electrical performance curves-only initial voltage accuracy differs, making BM variant preferred for higher-precision applications.
Can LM385BM-2.5 be used in series-reference configurations?
Yes, LM385BM-2.5 operates as a 2-terminal shunt reference and is intended for series-reference use: anode connects to higher-voltage rail, cathode delivers regulated 2.5 V to load, with a series current-setting resistor establishing operating current between 20 μA and 20 mA per TI's application schematics.
LM385BM-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- 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
LM385BM-2.5 FAQ
1.How can I place an order for LM385BM-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BM-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 LM385BM-2.5 reliable?
The price and inventory of LM385BM-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 LM385BM-2.5 is usually 5 days.
3.What payment methods are accepted for LM385BM-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BM-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BM-2.5?
LM385BM-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BM-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 LM385BM-2.5?
For technical support, including LM385BM-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BM-2.5 requirements.
6.How does Aetrix verify that LM385BM-2.5 is sourced from the original manufacturer or authorized distributors?
All LM385BM-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 LM385BM-2.5 meets industry standards.
7.What is the process for return or replacement of LM385BM-2.5?
All LM385BM-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM385BM-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 LM385BM-2.5 part is unused and in its original packaging.
Return procedure for LM385BM-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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