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Texas Instruments LM385M3X-2.5
- Part No.:
- LM385M3X-2.5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM385M3X-2.5.pdf
- Description:
- IC VREF SHUNT 3% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,740
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Product details
Overview
LM385M3X-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 (A grade), 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 precision analog signal conditioning circuits.
For engineers reviewing the LM385M3X-2.5 datasheet, LM385M3X-2.5 pinout, LM385M3X-2.5 application, or LM385M3X-2.5 equivalent, key selection considerations include its SOT-23 package, 0°C to 70°C operating temperature range, low 20 μA minimum operating current, and compatibility with capacitive loads up to 10 nF without instability.
Technical Context
The LM385M3X-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/1000 hr), and tight temperature coefficient (30 ppm/°C for X-suffix variant). Its 2-terminal configuration simplifies layout and eliminates external biasing components.
Designed for micropower systems, it achieves stable regulation across a wide dynamic current range (20 μA–20 mA) while maintaining low reverse dynamic impedance (0.6 Ω at 100 μA, 20 Hz) and minimal voltage drift (≤2.5 mV total change from 20 μA to 20 mA). The device is not recommended for new designs per TI's NRND status but remains in active production for legacy support.
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 absolute error bounds |
| Initial Tolerance | ±20 mV (A grade) - enables single-point calibration in portable test equipment without trimming |
| 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 - minimizes load-induced voltage sag during transient current demands |
| Temperature Coefficient | 30 ppm/°C (X suffix) - guarantees ≤0.525 mV drift over full 0°C–70°C range for industrial-grade accuracy |
| Long-Term Stability | 20 ppm/1000 hr - preserves calibration integrity in field-deployed monitoring systems |
| Noise (10 Hz–10 kHz) | 120 μV rms - avoids signal corruption in high-resolution 16-bit+ data acquisition front-ends |
Pinout & Package
SOT-23 (DBZ) 3-pin plastic package, 1.12 mm max height, lead-free (RoHS-compliant) CU SN finish, moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current sink input | Connected to system ground or negative rail; reverse-biased to establish reference voltage at cathode |
| Cathode (Pin 2) | Reference output | Provides regulated 2.5 V; must be decoupled with ≥10 nF capacitor for optimal stability and noise rejection |
| NC / Die Attach Pad (Pin 3) | Thermal pad / no connection | Internally connected to die attach pad; electrically isolated-may be left floating or tied to Pin 2 for improved thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive load tolerance | Stable with ≥10 nF output capacitance-eliminates need for series isolation resistor in battery-powered sensor nodes |
| Micropower operation | 20 μA minimum operating current-extends shelf life of 9 V battery-powered handheld calibrators beyond 5 years |
| Low dynamic impedance | 0.6 Ω at 100 μA-reduces output voltage variation under varying load currents in precision current sources |
| Hermetic-grade stability | 20 ppm/1000 hr long-term drift-meets calibration retention requirements for field-serviceable test instruments |
| Wide temperature coefficient control | 30 ppm/°C (X suffix)-enables use in unheated industrial enclosures without active thermal compensation |
Applications
| Battery-Powered Multimeters | Precision Thermocouple 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: 2-terminal voltage reference providing excitation and scaling for ratiometric measurement circuitry. Use Value: Enables ±0.05% full-scale accuracy without periodic recalibration, leveraging 30 ppm/°C tempco and 20 μA quiescent draw. |
Use Scenario: Portable thermocouple thermometer with cold-junction compensation in consumer medical devices. IC Role / Device Role / Timing Role: Micropower reference supplying bias for thermocouple amplifier and offset correction network. Use Value: Delivers <120 μV rms noise and <2.5 mV total current-induced drift-critical for sub-0.5°C temperature resolution. |
| Low-Power Data Loggers | Industrial Sensor Transmitters |
Use Scenario: Remote environmental sensor node powered by coin cell, logging temperature/humidity every 10 minutes. IC Role / Device Role / Timing Role: Reference source for analog front-end and internal ADC during brief wake-up cycles. Use Value: 20 μA minimum current allows operation down to 1.8 V supply; 10 nF capacitive load tolerance simplifies PCB layout. |
Use Scenario: 4–20 mA loop-powered pressure transmitter operating in 0°C–70°C factory environments. IC Role / Device Role / Timing Role: Stable 2.5 V reference for DAC-based current loop control and sensor bridge excitation. Use Value: 0.6 Ω dynamic impedance prevents gain error shifts during loop current transients; RoHS-compliant SOT-23 fits compact modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385M3-2.5/NOPB | Same SOT-23 package and 2.5 V output, but B-grade (±50 mV tolerance, 50 ppm/°C tempco) | Lower accuracy; suitable for non-critical biasing where cost is prioritized over precision | Select when ±2% reference error is acceptable and long-term stability >20 ppm/1000 hr is not required |
| TLVH431AIDBZR | Adjustable shunt regulator (2.5 V min), 3-pin, 80 μA typical IQ, ±0.5% initial tolerance | Requires external resistors for fixed 2.5 V; higher quiescent current but superior tempco (39 ppm/°C max) | Choose for designs needing tighter tolerance or compatibility with existing TLVH431 footprint; not drop-in compatible |
Compared with LM385M3X-2.5, LM385M3-2.5/NOPB trades accuracy for cost in legacy systems, while TLVH431AIDBZR offers better tolerance and tempco at the expense of added components and higher IQ-making LM385M3X-2.5 optimal for space-constrained, ultra-low-power 2-terminal reference needs.
Availability
LM385M3X-2.5 is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable test equipment, and industrial sensor transmitters requiring stable component supply with verified RoHS compliance and traceable lot history.
Supply support for LM385M3X-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, embedded processing, and connectivity technologies with over 50 years of analog design heritage.
The LM385 family was engineered for micropower precision reference applications in portable, battery-operated, and space-constrained systems-prioritizing ultra-low IQ, capacitive-load stability, and long-term calibration integrity.
FAQ
What is the operating temperature range for LM385M3X-2.5?
The LM385M3X-2.5 is rated for operation from 0°C to +70°C ambient temperature. This commercial-grade range aligns with its intended use in portable instruments and industrial sensor modules-not for extended automotive or military environments. The device's 30 ppm/°C temperature coefficient ensures predictable performance across this span, and derating is not required within these limits. LM385M3X-2.5 maintains specified electrical characteristics throughout this range without external compensation.
Is LM385M3X-2.5 pin-compatible with other LM385 variants in SOT-23?
Yes, LM385M3X-2.5 shares identical SOT-23 (DBZ) pinout and mechanical footprint with LM385M3-2.5/NOPB and LM385M3-2.5-Pin 1 (Anode), Pin 2 (Cathode), Pin 3 (NC/DAP). However, electrical differences exist: LM385M3X-2.5 has tighter ±20 mV tolerance and 30 ppm/°C tempco versus ±50 mV/50 ppm for the B-grade version. No PCB changes are needed for substitution, but system-level accuracy validation is recommended.
Can LM385M3X-2.5 drive a 10 nF capacitor directly?
Yes, LM385M3X-2.5 is explicitly designed for exceptional capacitive load tolerance-stable with ≥10 nF output capacitance without oscillation or phase margin loss. This capability eliminates the need for series isolation resistors in most applications, simplifying layout and reducing component count. The datasheet confirms stability with "capacitive loading up to 10 nF" and cites low dynamic impedance (0.6 Ω) as the enabling factor. LM385M3X-2.5 performs reliably in this configuration across its full 20 μA–20 mA operating current range.
What does the 'X' suffix indicate in LM385M3X-2.5?
The 'X' suffix in LM385M3X-2.5 denotes the temperature coefficient grade: 30 ppm/°C maximum average TC over 0°C–70°C. This is tighter than the 'Y' (50 ppm/°C) and standard (150 ppm/°C) grades. The 'X' grade also correlates with ±20 mV initial tolerance (A grade) and is fully tested per TI's production limits. LM385M3X-2.5 is therefore specified for applications demanding higher thermal stability-such as unheated industrial sensors or portable calibrators used across seasonal ambient variations.
Is LM385M3X-2.5 recommended for new designs?
No-TI classifies LM385M3X-2.5 as "NRND" (Not Recommended for New Designs) per its official packaging addendum. While actively stocked and supported for legacy production, TI encourages migration to newer alternatives like REF3025 or TLV431 for new projects. LM385M3X-2.5 remains viable for sustaining engineering, repair, or replacement in existing products where qualification timelines or cost constraints prohibit redesign. Aetrix Electronics provides full lifecycle coordination for such NRND parts.
LM385M3X-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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:
- 15 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM385M3X-2.5 FAQ
1.How can I place an order for LM385M3X-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385M3X-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 LM385M3X-2.5 reliable?
The price and inventory of LM385M3X-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 LM385M3X-2.5 is usually 5 days.
3.What payment methods are accepted for LM385M3X-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385M3X-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385M3X-2.5?
LM385M3X-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385M3X-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 LM385M3X-2.5?
For technical support, including LM385M3X-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385M3X-2.5 requirements.
6.How does Aetrix verify that LM385M3X-2.5 is sourced from the original manufacturer or authorized distributors?
All LM385M3X-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 LM385M3X-2.5 meets industry standards.
7.What is the process for return or replacement of LM385M3X-2.5?
All LM385M3X-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LM385M3X-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 LM385M3X-2.5 part is unused and in its original packaging.
Return procedure for LM385M3X-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM385M3X-2.5 Tags
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