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Texas Instruments LM385MX-2.5
- Part No.:
- LM385MX-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385MX-2.5.pdf
- Description:
- IC VREF SHUNT 3% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,204
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Product details
Overview
LM385MX-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 (A grade), 0.6 Ω dynamic impedance, and operation over 20 μA–20 mA current range. It serves as a stable reference in portable meters, battery-powered analog circuitry, and precision current sources where low quiescent current and temperature stability are critical.
For engineers reviewing the LM385MX-2.5 datasheet, LM385MX-2.5 pinout, LM385MX-2.5 application, or LM385MX-2.5 equivalent, key selection factors include its 0°C to 70°C operating temperature range, SOIC-8 package, 30 ppm/°C temperature coefficient (X suffix), and compatibility with capacitive loads up to 10 μF without instability.
Technical Context
The LM385MX-2.5 implements a two-terminal band-gap architecture using only transistors and resistors-enabling low noise, excellent long-term stability (20 ppm over 1000 hours), and minimal sensitivity to capacitive loading. Its on-chip trimming ensures tight initial voltage tolerance without external calibration.
It operates as a shunt reference: reverse-biased across a current-setting resistor, regulating voltage by sinking variable current while maintaining 2.5 V across its terminals. The device exhibits 120 μV rms wideband noise (10 Hz–10 kHz) and maintains regulation even at minimum 20 μA operating current.
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 within tight error budgets |
| 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 - minimizes output voltage shift under load transients, critical for precision measurement circuits |
| Temperature Coefficient | 30 ppm/°C (X suffix) - limits drift to ≤2.25 mV over 0°C–70°C ambient, enabling stable performance in consumer-grade environments |
| Reverse Breakdown Voltage Change | ≤10 mV from 1 mA to 20 mA - guarantees <0.4% output variation across full operating current, simplifying current-source design |
| Wideband Noise (10 Hz–10 kHz) | 120 μV rms - low enough for 12-bit+ resolution systems without additional filtering |
| Long-Term Stability | 20 ppm over 1000 hours - reduces calibration frequency in field-deployed instrumentation |
Pinout & Package
LM385MX-2.5 is packaged in an 8-pin SOIC (Package Drawing D, TI designation D0008A), with pin 1 identified by a notch or index area. The device uses a standard SOIC-8 footprint (5.4 mm × 6.5 mm, 1.75 mm max height) compatible with IPC-7351 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Cathode connection point) | Connected to system ground or low-impedance return path; forms reference node with Pin 2 |
| Pin 2 | Cathode (Reference output) | Delivers regulated 2.5 V; must be decoupled locally for stability with capacitive loads up to 10 μF |
| Pins 3–8 | No-connect (NC) | Internally unconnected; left floating per TI specification - no PCB routing required |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive load tolerance | Stable with ≥10 μF output capacitance - eliminates need for series isolation resistors in battery-monitoring circuits |
| Micropower operation | 20 μA minimum operating current - enables >1-year battery life in 9V-powered portable meters |
| Tight initial tolerance | ±20 mV (±0.8%) - reduces or eliminates factory calibration steps in production test |
| Low dynamic impedance | 0.6 Ω - maintains reference accuracy during fast-sampling ADC conversions with pulsed current draw |
| Hermetic-grade stability | 20 ppm long-term drift (1000 hr) - supports unattended operation in environmental data loggers |
Applications
| Portable Digital Multimeter | Battery-Powered Sensor Transmitter |
|---|---|
Use Scenario: Handheld DMM requiring 3.5-digit accuracy with 9V alkaline supply and auto-ranging. IC Role / Device Role / Timing Role: Shunt voltage reference for 12-bit SAR ADC and LCD bias generation. Use Value: 20 μA operating current extends battery life to >18 months; ±20 mV tolerance ensures factory calibration holds over shelf life. |
Use Scenario: 4–20 mA loop-powered temperature transmitter operating from 12–24 VDC with RTD input. IC Role / Device Role / Timing Role: Precision 2.5 V reference for RTD bridge excitation and ADC reference. Use Value: 30 ppm/°C TC and 0.6 Ω impedance minimize span error across -20°C to +60°C industrial ambient. |
| Micropower Data Logger | Calibration Equipment Reference |
Use Scenario: Solar-charged environmental logger sampling every 10 minutes, sleeping at 1 μA between cycles. IC Role / Device Role / Timing Role: Low-current reference for microcontroller ADC and internal DAC used in self-test routines. Use Value: Stable 2.5 V output at 20 μA enables wake-up reference establishment in <100 μs, minimizing active time. |
Use Scenario: Benchtop calibrator requiring traceable 2.5 V output with <50 ppm/year drift specification. IC Role / Device Role / Timing Role: Primary voltage reference in programmable DC source's feedback divider network. Use Value: 20 ppm/1000 hr long-term stability and 120 μV noise support Class I calibration accuracy without oven control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BZ-2.5/NOPB | TO-92 package (3-pin), 0°C–70°C, same electrical specs but higher thermal resistance (θJA = 440°C/W vs. 165°C/W for SOIC) | Preferred for through-hole prototyping or space-constrained PCBs where SOIC reflow is impractical | Select when manual assembly, thermal budget allows >10°C rise at 20 mA, or legacy TO-92 footprint is fixed |
| REF3025AIDBZR | 3-pin SOT-23, 2.5 V, ±0.2% initial tolerance, 50 ppm/°C TC, 220 μA typical quiescent current | Higher accuracy and lower TC but consumes 11× more current - unsuitable for sub-50 μA systems | Choose only when tighter initial tolerance outweighs battery life impact; not drop-in due to 3-pin topology and higher IQ |
Compared with LM385BZ-2.5/NOPB, LM385MX-2.5 offers superior thermal performance and surface-mount compatibility; versus REF3025AIDBZR, it delivers 11× lower operating current at the cost of ±0.8% tolerance - making it optimal for cost-sensitive, battery-limited designs where 0.8% is acceptable.
Availability
LM385MX-2.5 is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensor transmitters, and micropower data loggers requiring stable component supply with consistent SOIC-8 packaging and RoHS-compliant lead finish.
Supply support for LM385MX-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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision voltage references and power management ICs.
The LM385MX-2.5 belongs to TI's micropower shunt reference product line, designed specifically for battery-operated and energy-constrained systems demanding high accuracy, low drift, and robust capacitive-load stability.
FAQ
What is the operating temperature range for LM385MX-2.5?
The LM385MX-2.5 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 such as portable instruments and consumer-grade sensor interfaces. It is not specified for extended industrial or automotive temperature ranges.
Can LM385MX-2.5 replace LM385M-2.5/NOPB in an existing design?
Yes - LM385MX-2.5/NOPB is functionally identical to LM385M-2.5/NOPB, sharing the same SOIC-8 package, electrical specifications, and marking (LM385 M2.5). The "X" suffix denotes tape-and-reel packaging (2500-unit reel), whereas "M" indicates tube packaging (95-unit tube); no electrical or thermal differences exist between them.
Does LM385MX-2.5 require an external capacitor for stability?
No - the LM385MX-2.5 is explicitly designed to remain stable with output capacitance up to 10 μF, including ceramic, tantalum, and electrolytic types. Unlike many older references, it does not require a series isolation resistor or minimum ESR, simplifying layout in battery-powered systems.
What is the maximum reverse current rating for LM385MX-2.5?
The absolute maximum reverse current for LM385MX-2.5 is 30 mA. However, its specified operating range is 20 μA to 20 mA; operation above 20 mA may increase self-heating and degrade long-term stability without violating absolute ratings.
How does the temperature coefficient of LM385MX-2.5 compare to LM385BXMX-2.5/NOPB?
LM385MX-2.5 carries the "M" suffix, indicating the standard 150 ppm/°C temperature coefficient. In contrast, LM385BXMX-2.5/NOPB has the "BX" suffix, specifying a tighter 30 ppm/°C coefficient. Both share identical packaging and pinout, but only the BX variant meets requirements for <3 mV total drift over 0°C–70°C.
LM385MX-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:
- ±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
LM385MX-2.5 FAQ
1.How can I place an order for LM385MX-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385MX-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 LM385MX-2.5 reliable?
The price and inventory of LM385MX-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 LM385MX-2.5 is usually 5 days.
3.What payment methods are accepted for LM385MX-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385MX-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385MX-2.5?
LM385MX-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385MX-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 LM385MX-2.5?
For technical support, including LM385MX-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385MX-2.5 requirements.
6.How does Aetrix verify that LM385MX-2.5 is sourced from the original manufacturer or authorized distributors?
All LM385MX-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 LM385MX-2.5 meets industry standards.
7.What is the process for return or replacement of LM385MX-2.5?
All LM385MX-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM385MX-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 LM385MX-2.5 part is unused and in its original packaging.
Return procedure for LM385MX-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM385MX-2.5 Tags
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TL431AIDBZR
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