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Texas Instruments LM385M-1.2/NOPB
- Part No.:
- LM385M-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385M-1.2/NOPB.pdf
- Description:
- IC VREF SHNT -2.43%/+2.02% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,628
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Product details
Overview
LM385M-1.2/NOPB from Texas Instruments is a micropower 2-terminal band-gap voltage reference diode delivering a precise 1.235 V output with ±1% initial tolerance, 1 Ω dynamic impedance, and 150 ppm/°C temperature coefficient over 0°C to 70°C. It operates from 10 μA to 20 mA reverse current and is used in battery-powered precision analog circuits such as portable meters and low-power thermometers.
For engineers reviewing the LM385M-1.2/NOPB datasheet, LM385M-1.2/NOPB pinout, LM385M-1.2/NOPB application, or LM385M-1.2/NOPB equivalent, key selection criteria include its low operating current (10 μA min), tight voltage tolerance, capacitive load immunity, and SOIC-8 package compatibility with surface-mount production.
Technical Context
The LM385M-1.2/NOPB implements a band-gap reference architecture using on-chip trimmed transistors and resistors to achieve stable 1.235 V output across wide current and temperature ranges. Its two-terminal configuration simplifies integration into current-source and shunt-reference topologies without requiring external biasing.
Designed for micropower operation, it draws only 10 μA minimum reverse current and maintains <1.5 mV voltage change from 10 μA to 1 mA, enabling use in ultra-low-power systems like 1.5 V battery-powered thermometers and 9 V portable meters where supply current must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; tight regulation enables accurate ADC/DAC biasing and sensor excitation at low power. |
| Initial Tolerance | ±1% at 25°C; eliminates need for post-assembly trimming in cost-sensitive portable instrumentation. |
| Operating Current Range | 10 μA to 20 mA reverse current; supports both micropower (e.g., 1.5 V battery) and higher-current regulator applications. |
| Dynamic Impedance | 1 Ω typical; ensures minimal output voltage shift under varying load or supply ripple conditions. |
| Temperature Coefficient | 150 ppm/°C max (0°C to 70°C); provides predictable drift in industrial ambient environments without active compensation. |
| Long-Term Stability | 20 ppm over 1000 hours; critical for calibration-critical equipment requiring infrequent recalibration. |
Pinout & Package
LM385M-1.2/NOPB is housed in an 8-pin SOIC package (Package Drawing D), with pins 1–8 arranged linearly. The device uses a 2-terminal configuration: Pin 1 is Cathode (output/reference node), Pin 8 is Anode (ground return). Pins 2–7 are NC (no internal connection) and must remain unconnected per TI design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pins 1, 8 | Cathode (Pin 1), Anode (Pin 8) | Functional 2-terminal shunt reference; all other pins are internally unconnected and electrically isolated. |
| Pins 2–7 | No Connection (NC) | Must be left floating or grounded per PCB layout best practices-no internal circuitry attached. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with unlimited capacitive loading-enables direct decoupling without series resistance or stability compensation. |
| Micropower Operation | 10 μA minimum operating current extends battery life in portable devices beyond shelf-life limits. |
| Low Dynamic Impedance | 1 Ω typical impedance minimizes output voltage variation under transient load changes in precision references. |
| On-Chip Trimmed Voltage | Laser-trimmed band-gap core achieves ±1% initial accuracy without external calibration components. |
| Wide Operating Current Range | 10 μA to 20 mA range allows reuse across low-power sensors and higher-current reference buffers. |
Applications
| Portable Digital Multimeter | Battery-Powered Thermometer |
|---|---|
|
Use Scenario: Handheld multimeter powered by 9 V alkaline battery requiring stable reference for 3½-digit ADC conversion. IC Role / Device Role / Timing Role: Shunt voltage reference providing 1.235 V基准 for ADC full-scale calibration and autoranging circuitry. Use Value: 10 μA minimum current draw extends battery life to >1 year; ±1% tolerance eliminates factory trim step during assembly. |
Use Scenario: Low-cost centigrade thermometer using 1.5 V AA cell and thermistor bridge sensing 0°C–100°C. IC Role / Device Role / Timing Role: Precision current source driver (via external resistor) generating 1 μA/K for Kelvin-scale linearization. Use Value: 150 ppm/°C TC and 20 ppm long-term stability ensure ±0.5°C accuracy over 2 years without recalibration. |
| Micropower 5 V Regulator | Thermocouple Cold-Junction Compensator |
|
Use Scenario: Standby power rail in IoT sensor node requiring regulated 5 V from variable 6–12 V input with <50 μA quiescent current. IC Role / Device Role / Timing Role: Reference element in discrete op-amp-based shunt regulator topology controlling pass transistor base. Use Value: 1 Ω dynamic impedance ensures <1 mV output ripple under 100 μA load transients; SOIC-8 footprint simplifies layout. |
Use Scenario: Industrial data logger measuring J-type thermocouples with cold-junction compensation at ambient temperatures. IC Role / Device Role / Timing Role: Temperature-sensing voltage reference generating 1.235 V offset that tracks ambient Kelvin temperature. Use Value: Matched thermal response enables ±0.2°C cold-junction compensation accuracy without external temperature sensor. |
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-1.2/NOPB | TO-92 package, 3-pin, same 1.235 V ±1% spec but rated for 0°C to 70°C with 150 ppm/°C TC. | Through-hole assembly; suitable for prototyping or legacy board upgrades where SOIC footprint is unavailable. | Select when manual soldering or socketing is required; not drop-in compatible due to different package and pin count. |
| REF3012AIDBZR | 1.2 V output, ±0.2% initial tolerance, 50 ppm/°C TC, SOT-23-3, 50 μA typical IQ. | Higher accuracy and lower drift, but requires 50 μA minimum current-unsuitable for sub-10 μA battery designs. | Choose for metrology-grade applications where 0.2% tolerance outweighs micropower constraints. |
Compared with LM385BZ-1.2/NOPB and REF3012AIDBZR, the LM385M-1.2/NOPB uniquely balances SOIC manufacturability, 10 μA minimum operation, and ±1% tolerance-making it optimal for cost-sensitive, high-volume portable instruments where ultra-low IQ is mandatory.
Availability
LM385M-1.2/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensors, and industrial data loggers requiring stable component supply with RoHS-compliant, lead-free packaging and consistent SOIC-8 form factor.
Supply support for LM385M-1.2/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 reference design and high-reliability manufacturing.
The LM385 family was engineered specifically for micropower shunt reference applications in portable and battery-constrained systems, emphasizing ultra-low current operation, capacitive-load immunity, and long-term stability without external components.
FAQ
What is the exact reference voltage and tolerance of LM385M-1.2/NOPB?
The LM385M-1.2/NOPB delivers a nominal reference voltage of 1.235 V with ±1% initial tolerance at 25°C, verified across production lots per TI's SNVS742E datasheet. This tolerance applies directly to the LM385M-1.2/NOPB variant and is achieved via on-chip laser trimming-no external calibration is needed for most portable instrument applications.
Can LM385M-1.2/NOPB operate from a 1.5 V battery?
Yes, the LM385M-1.2/NOPB can operate from a 1.5 V battery when configured as a shunt reference with appropriate current-limiting resistor. Its 10 μA minimum operating current and 1.235 V breakdown allow stable regulation even as battery voltage drops to ~1.3 V, making it ideal for the LM385M-1.2/NOPB-based thermometer circuits shown in TI's Figure 16.
What is the maximum operating temperature range for LM385M-1.2/NOPB?
The LM385M-1.2/NOPB is rated for operation from 0°C to +70°C ambient temperature, as confirmed in TI's PACKAGE OPTION ADDENDUM and Electrical Characteristics tables. This range is distinct from the wider −55°C to +125°C rating of the LM185-1.2-N variant and must be respected for guaranteed performance of the LM385M-1.2/NOPB.
Is LM385M-1.2/NOPB pin-compatible with other LM385 variants in SOIC-8?
No-LM385M-1.2/NOPB is a 2-terminal device in SOIC-8, with only Pins 1 (Cathode) and 8 (Anode) functional; Pins 2–7 are NC. Other SOIC-8 LM385 variants (e.g., LM385BM-1.2/NOPB) share identical pinout and NC behavior. However, it is not pin-compatible with TO-92 or SOT-23 variants due to differing package geometry and terminal count.
Does LM385M-1.2/NOPB require external capacitors for stability?
No, the LM385M-1.2/NOPB is explicitly designed for unconditional stability with capacitive loading-TI's datasheet states "exceptionally tolerant of capacitive loading" and confirms no external capacitor is needed. This eliminates BOM cost and layout area for the LM385M-1.2/NOPB in space-constrained portable designs.
LM385M-1.2/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.235V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- -2.43%, +2.02%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 60µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 15 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM385M-1.2/NOPB FAQ
1.How can I place an order for LM385M-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385M-1.2/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 LM385M-1.2/NOPB reliable?
The price and inventory of LM385M-1.2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM385M-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM385M-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385M-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385M-1.2/NOPB?
LM385M-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385M-1.2/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 LM385M-1.2/NOPB?
For technical support, including LM385M-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385M-1.2/NOPB requirements.
6.How does Aetrix verify that LM385M-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385M-1.2/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 LM385M-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM385M-1.2/NOPB?
All LM385M-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385M-1.2/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 LM385M-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM385M-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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