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Texas Instruments LM385BXM-2.5
- Part No.:
- LM385BXM-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385BXM-2.5.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,336
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Product details
Overview
LM385BXM-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, 0.6 Ω dynamic impedance, and operation over 20 μA–20 mA current range. It serves as a stable low-power reference in battery-powered instrumentation, portable meters, and analog signal conditioning circuits.
For engineers reviewing the LM385BXM-2.5 datasheet, LM385BXM-2.5 pinout, LM385BXM-2.5 application, or LM385BXM-2.5 equivalent, key selection criteria include its 0°C to 70°C operating temperature range, SOIC-8 package compatibility, low 20 μA minimum operating current, and tight 30 ppm/°C average temperature coefficient for A-grade variants.
Technical Context
The LM385BXM-2.5 implements a band-gap reference architecture using only transistors and resistors, enabling low noise and long-term stability. Its two-terminal configuration simplifies integration into current-source-based biasing and precision regulation topologies without requiring external feedback networks.
On-chip trimming ensures tight voltage tolerance, while exceptional capacitive loading tolerance allows direct use with bypass capacitors up to several microfarads-eliminating need for isolation resistors in most applications. The device exhibits 120 μVrms wideband noise (10 Hz–10 kHz) and 20 ppm long-term stability after 1000 hours at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±20 mV (±0.8%) - ensures accurate ADC/DAC biasing and sensor excitation within tight error budgets |
| Operating Current Range | 20 μA to 20 mA - supports ultra-low-power standby modes and higher-current precision regulation simultaneously |
| Dynamic Impedance | 0.6 Ω at 100 μA - minimizes load-induced voltage shift in high-precision current sources and ratiometric systems |
| Temperature Coefficient | 30 ppm/°C (X suffix) - enables stable performance across 0°C–70°C industrial ambient without external compensation |
| Wideband Noise | 120 μVrms (10 Hz–10 kHz) - preserves signal integrity in high-resolution data acquisition front-ends |
| Long-Term Stability | 20 ppm (1000 hr @ 25°C) - reduces calibration drift in field-deployed measurement equipment |
Pinout & Package
LM385BXM-2.5 is housed in an 8-pin SOIC package (Package Drawing D, JEDEC MS-012), with thermal pad connected internally to Pin 2. This surface-mount package supports automated assembly and provides improved thermal dissipation versus TO-92 alternatives.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Current sink terminal; connects to ground or low-side current source in reverse-biased reference configuration |
| Pin 2 | Cathode | Output/reference voltage node; must be decoupled with capacitor for stability in noisy environments |
| Pins 3–8 | No Connect / Thermal Pad Tie | Internally tied to die attach pad; recommended to connect to Pin 2 for enhanced thermal performance and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Loading Tolerance | Stable with ≥1 μF output capacitance - eliminates need for series isolation resistor in battery-powered designs |
| Micropower Operation | 20 μA minimum operating current - extends shelf life of portable instruments and enables sub-μA sleep-mode references |
| Tight Initial Tolerance | ±20 mV (±0.8%) - reduces or eliminates post-manufacture trimming in production test flows |
| Low Dynamic Impedance | 0.6 Ω - maintains reference accuracy under varying load currents in precision current mirrors and DAC buffers |
| Band-Gap Architecture | Transistor/resistor-only design - delivers inherent low-noise and superior long-term drift vs. Zener-based references |
Applications
| Portable Multimeters | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Handheld digital multimeter requiring stable 2.5 V reference for 16-bit ADC conversion across 0°C–50°C ambient. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing ratiometric excitation for internal voltage divider and ADC reference input. Use Value: 30 ppm/°C tempco and 20 μA operating current enable >1000-hour battery life with <0.01% full-scale error drift. | Use Scenario: 4–20 mA loop-powered pressure transmitter with onboard analog front-end and microcontroller. IC Role / Device Role / Timing Role: Precision voltage reference for bridge sensor excitation and ADC reference in isolated analog domain. Use Value: 0.6 Ω dynamic impedance ensures <10 μV load regulation error despite varying sensor bridge current draw. |
| Calibration Equipment | Thermocouple Cold-Junction Compensation |
Use Scenario: Benchtop calibration source generating traceable 2.5 V outputs for field instrument verification. IC Role / Device Role / Timing Role: Primary voltage standard referenced against metrology-grade standards during self-calibration cycles. Use Value: 20 ppm long-term stability over 1000 hours reduces annual recalibration frequency and associated downtime. | Use Scenario: Embedded temperature controller compensating J-type thermocouple output in HVAC control panel. IC Role / Device Role / Timing Role: Micropower reference supplying bias current to cold-junction compensation circuitry and ADC reference. Use Value: 120 μVrms wideband noise prevents added uncertainty in sub-0.1°C temperature resolution requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BXZ-2.5/NOPB | TO-92 package, same electrical specs, 0°C–70°C rating, 3-pin through-hole | Suitable for prototyping, manual assembly, or legacy board designs requiring axial leaded components | Select when mechanical mounting constraints or hand-soldering workflows preclude SOIC use |
| REF3025AIDBZR | 2.5 V, 50 ppm/°C max, 50 μA typical quiescent current, SOT-23-3, 1000-hr stability = 15 ppm | Higher power consumption but lower noise (25 μVpp), better MSL rating, and tighter tempco guarantee | Choose for new designs demanding lower noise or extended temperature coverage beyond 70°C |
Compared with LM385BXM-2.5, LM385BXZ-2.5/NOPB offers identical electrical performance in a through-hole package for legacy compatibility, while REF3025AIDBZR trades higher quiescent current for improved noise and guaranteed tempco-making it preferable for high-resolution, low-drift applications where power budget allows.
Availability
LM385BXM-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and calibration equipment requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM385BXM-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 industrial-grade reference solutions.
The LM385 family was designed specifically for micropower, high-stability voltage referencing in battery-operated and space-constrained applications-emphasizing low operating current, tight initial tolerance, and robust capacitive loading behavior.
FAQ
What is the operating temperature range for LM385BXM-2.5?
The LM385BXM-2.5 is rated for operation from 0°C to +70°C ambient temperature. This commercial-grade specification aligns with its SOIC packaging and target applications in non-military industrial and portable equipment. The device's 30 ppm/°C temperature coefficient ensures predictable performance across this full range without external compensation.
Does LM385BXM-2.5 require an external current-limiting resistor?
Yes - LM385BXM-2.5 operates as a two-terminal shunt reference and requires an external series resistor to set the operating current between 20 μA and 20 mA. The resistor value is calculated as (VSUPPLY − 2.5 V) / IREF, where IREF is selected based on desired dynamic impedance and noise trade-offs.
What is the meaning of the 'B' and 'X' suffixes in LM385BXM-2.5?
In LM385BXM-2.5, 'B' denotes the LM385 series grade with ±20 mV initial tolerance, and 'X' indicates the 30 ppm/°C average temperature coefficient variant. The 'M' suffix specifies the SOIC-8 package. Together, these define the exact electrical and mechanical identity of the LM385BXM-2.5 part ordered.
Can LM385BXM-2.5 replace LM385M-2.5 in existing designs?
Yes - LM385BXM-2.5 is a direct functional and pin-compatible replacement for LM385M-2.5 in SOIC-8 layouts, offering tighter initial tolerance (±20 mV vs. ±50 mV) and lower temperature coefficient (30 ppm/°C vs. 150 ppm/°C). No PCB changes are required, though layout review is recommended to confirm thermal pad connection per TI guidelines.
Is LM385BXM-2.5 RoHS compliant and lead-free?
Yes - LM385BXM-2.5/NOPB is RoHS-compliant and lead-free, with "NOPB" denoting NiPdAu lead finish over copper. It meets TI's Green (low halogen) and RoHS requirements, and is qualified for lead-free reflow per JEDEC Level-1 moisture sensitivity classification with peak solder temperature of 260°C.
LM385BXM-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:
- 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
LM385BXM-2.5 FAQ
1.How can I place an order for LM385BXM-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BXM-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 LM385BXM-2.5 reliable?
The price and inventory of LM385BXM-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 LM385BXM-2.5 is usually 5 days.
3.What payment methods are accepted for LM385BXM-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BXM-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BXM-2.5?
LM385BXM-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BXM-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 LM385BXM-2.5?
For technical support, including LM385BXM-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BXM-2.5 requirements.
6.How does Aetrix verify that LM385BXM-2.5 is sourced from the original manufacturer or authorized distributors?
All LM385BXM-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 LM385BXM-2.5 meets industry standards.
7.What is the process for return or replacement of LM385BXM-2.5?
All LM385BXM-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM385BXM-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 LM385BXM-2.5 part is unused and in its original packaging.
Return procedure for LM385BXM-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM385BXM-2.5 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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