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Texas Instruments LM385M3-2.5/NOPB
- Part No.:
- LM385M3-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM385M3-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 3% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,392
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Product details
Overview
LM385M3-2.5/NOPB 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 (A grade), and operation over 20 μA–20 mA current range. It serves as a stable reference in portable meters, battery-powered analog circuits, and precision current sources where low quiescent current and temperature stability are critical.
For engineers reviewing the LM385M3-2.5/NOPB datasheet, LM385M3-2.5/NOPB pinout, LM385M3-2.5/NOPB application, or LM385M3-2.5/NOPB equivalent, key selection criteria include its SOT-23 package, 0°C to 70°C operating temperature range, 30 ppm/°C max average temperature coefficient (X suffix), and compatibility with capacitive loads up to 10 μF without oscillation.
Technical Context
The LM385M3-2.5/NOPB uses on-chip trimming for tight voltage tolerance and relies solely on transistors and resistors-enabling low noise (120 μV rms, 10 Hz–10 kHz) and excellent long-term stability (20 ppm over 1000 hours). Its two-terminal architecture simplifies layout and eliminates external bias components.
It operates as a reverse-biased Zener-like device with low dynamic impedance (0.6 Ω at 100 μA, 20 Hz), wide operating current range (20 μA min, 20 mA max), and minimal voltage change (≤2.5 mV) across 20 μA–1 mA, making it suitable for micropower systems requiring high accuracy under varying load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±20 mV (±0.8%) at 100 μA - ensures accurate ADC/DAC reference or sensor excitation without calibration. |
| Initial Tolerance | ±20 mV (A grade) - reduces system-level trimming effort in production test. |
| Operating Current Range | 20 μA to 20 mA - supports ultra-low-power standby (e.g., 30 μA meter applications) and higher-drive reference buffering. |
| Dynamic Impedance | 0.6 Ω at 100 μA, 20 Hz - maintains regulation stability against rapid load transients in precision analog front-ends. |
| Average Tempco | 30 ppm/°C (X suffix) - limits voltage drift to ≤5.25 mV over 0°C–70°C ambient, critical for unheated industrial sensors. |
| Wideband Noise | 120 μV rms (10 Hz–10 kHz) - avoids signal corruption in 16-bit+ data acquisition systems. |
| Long-Term Stability | 20 ppm over 1000 hours - enables reliable performance in sealed instrumentation without recalibration. |
Pinout & Package
SOT-23 package (DBZ drawing), 3-pin surface-mount, 1.12 mm max height, RoHS-compliant, moisture sensitivity level 1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Current Sink Input | Connects to regulated supply rail; reverse-biased operation requires current into this terminal. |
| Pin 2 (Cathode) | Reference Output | Provides stable 2.5 V output; must be decoupled with ≥0.1 μF ceramic capacitor for stability. |
| Pin 3 (NC) | No Connect | Internally unconnected; leave floating per TI specification - not tied to die attach pad. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with up to 10 μF output capacitance - eliminates need for series isolation resistor in battery-monitoring circuits. |
| Micropower Operation | 20 μA minimum operating current - extends shelf-life-equivalent battery life in portable multimeters and IoT edge nodes. |
| Low Dynamic Impedance | 0.6 Ω at 100 μA - minimizes output voltage sag during ADC sampling bursts or DAC settling events. |
| Hermetic Stability | 20 ppm long-term drift (1000 hr) - ensures calibration retention in medical thermometers and field-deployed sensors. |
| Temperature Coefficient Control | 30 ppm/°C (X suffix) - enables use in unregulated environments like automotive cabin modules without thermal compensation. |
Applications
| Portable Digital Multimeter | Precision Current Source |
|---|---|
Use Scenario: Handheld DMM requiring 3.5-digit accuracy and 10-year calibration stability on AA batteries. IC Role / Device Role / Timing Role: Primary 2.5 V reference for 16-bit sigma-delta ADC and auto-ranging circuitry. Use Value: 20 μA min operating current enables >5-year battery life; ±20 mV tolerance avoids factory trim steps. |
Use Scenario: Programmable 1–100 μA current source for gas sensor biasing in environmental monitors. IC Role / Device Role / Timing Role: Stable voltage reference feeding op-amp-based Howland current pump. Use Value: 0.6 Ω dynamic impedance prevents current error drift during sensor resistance changes. |
| Thermocouple Cold-Junction Compensation | Battery-Voltage Monitor |
Use Scenario: Industrial thermocouple transmitter operating at 0°C–100°C ambient with J/K-type inputs. IC Role / Device Role / Timing Role: Reference for precision thermistor network generating cold-junction voltage. Use Value: 30 ppm/°C tempco ensures <±1°C measurement error across full operating range without software correction. |
Use Scenario: Li-ion battery fuel gauge in wearables, monitoring 2.8–4.2 V cell voltage. IC Role / Device Role / Timing Role: Reference for comparator-based low-battery warning threshold (e.g., 3.0 V). Use Value: Stable 2.5 V output enables accurate 3.0 V detection using simple resistor divider; 120 μV noise avoids false triggers. |
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 2.5 V output and X-suffix tempco, but 3-pin through-hole with Pin 2 = cathode, Pin 3 = anode. | Requires PCB through-hole footprint and manual assembly; unsuitable for high-density SMT layouts. | Select when legacy board compatibility or hand-soldering prototyping is required. |
| REF3025AIDBZR | 2.5 V, 50 ppm/°C max tempco, 50 μA typical quiescent current, SOT-23-3, but higher 100 μV noise and 15 Ω dynamic impedance. | Higher power consumption and lower AC performance limit use in ultra-low-noise 24-bit systems. | Choose only if wider input voltage range (2.7–5.5 V) or tighter initial tolerance (±0.2%) outweighs noise/impedance trade-offs. |
Compared with LM385BXZ-2.5/NOPB, LM385M3-2.5/NOPB offers identical electrical specs in a smaller, automated-assembly-compatible SOT-23 package; compared with REF3025AIDBZR, it delivers superior dynamic impedance and noise at lower quiescent current, though with slightly relaxed initial tolerance.
Availability
LM385M3-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensor nodes, and precision analog front-ends requiring stable component supply, consistent parametric performance, and long-lifecycle availability.
Supply support for LM385M3-2.5/NOPB 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 analog ICs and voltage references.
The LM385 series belongs to TI's micropower voltage reference product line, designed specifically for battery-operated and space-constrained applications demanding low quiescent current, high accuracy, and robust capacitive-load stability.
FAQ
What is the operating temperature range for LM385M3-2.5/NOPB?
The LM385M3-2.5/NOPB is rated for operation from 0°C to +70°C ambient temperature. This commercial-grade range aligns with its intended use in consumer electronics, portable test equipment, and industrial control interfaces where extended temperature capability is not required. The device's 30 ppm/°C average temperature coefficient ensures predictable performance across this span.
Can LM385M3-2.5/NOPB drive a 1 μF output capacitor directly?
Yes, the LM385M3-2.5/NOPB is explicitly designed for exceptional capacitive-load tolerance and remains stable with output capacitances up to 10 μF. Driving a 1 μF ceramic capacitor is well within specification and commonly used to suppress high-frequency noise in ADC reference paths. No series resistor is needed.
What does the "M3" in LM385M3-2.5/NOPB indicate?
The "M3" suffix denotes the SOT-23 package variant of the LM385-2.5 family. It distinguishes this 3-pin surface-mount version from SOIC (M), TO-92 (Z), and hermetic TO (H) variants. The marking "R12" appears on the top of the LM385M3-2.5/NOPB die for identification.
Is LM385M3-2.5/NOPB pin-compatible with other SOT-23 voltage references?
No - LM385M3-2.5/NOPB has a unique 2-terminal configuration (anode/cathode/NC) incompatible with 3-terminal references like TLV431 or REF3025. Pin 3 is no-connect, while Pin 1 is anode and Pin 2 is cathode. Substitution requires schematic and layout revision to accommodate its two-terminal topology.
How does the LM385M3-2.5/NOPB achieve low noise despite its micropower design?
The LM385M3-2.5/NOPB achieves 120 μV rms wideband noise (10 Hz–10 kHz) by using a pure band-gap core with no active amplification stages. Its all-passive internal structure - transistors and trimmed resistors only - avoids flicker noise mechanisms common in op-amp-based references, preserving signal integrity in high-resolution data converters.
LM385M3-2.5/NOPB 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:
- Active
- 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
LM385M3-2.5/NOPB FAQ
1.How can I place an order for LM385M3-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385M3-2.5/NOPB 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 LM385M3-2.5/NOPB reliable?
The price and inventory of LM385M3-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM385M3-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM385M3-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385M3-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385M3-2.5/NOPB?
LM385M3-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385M3-2.5/NOPB 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 LM385M3-2.5/NOPB?
For technical support, including LM385M3-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385M3-2.5/NOPB requirements.
6.How does Aetrix verify that LM385M3-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385M3-2.5/NOPB 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 LM385M3-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM385M3-2.5/NOPB?
All LM385M3-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385M3-2.5/NOPB, 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 LM385M3-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM385M3-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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