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Texas Instruments LM385BM-1.2/NOPB
- Part No.:
- LM385BM-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385BM-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,943
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Product details
Overview
LM385BM-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 30 ppm/°C temperature coefficient across 0°C to 70°C. It operates over a wide 10 μA–20 mA current range and supports low-noise, long-term stable analog circuitry in battery-powered instrumentation.
For engineers reviewing the LM385BM-1.2/NOPB datasheet, LM385BM-1.2/NOPB pinout, LM385BM-1.2/NOPB application, or LM385BM-1.2/NOPB equivalent, key selection criteria include its SOIC-8 package compatibility, 1.235 V reference accuracy at microamp-level bias currents, low thermal drift in consumer-grade temperature range, and suitability for precision current sources and portable metering designs.
Technical Context
The LM385BM-1.2/NOPB implements a band-gap reference architecture using on-chip trimmed transistors and resistors, enabling low noise (60 μVrms, 10 Hz–10 kHz) and excellent long-term stability (20 ppm/1000 hr). Its 2-terminal configuration simplifies integration into floating or grounded reference paths without external feedback components.
Designed for operation from 10 μA minimum current, it maintains regulation across supply variations while exhibiting exceptional capacitive loading tolerance-enabling direct use with bypass capacitors up to several microfarads without oscillation. The SOIC-8 package provides thermal resistance of 165°C/W (junction-to-ambient), supporting reliable performance in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; tight ±1% initial tolerance enables accurate calibration without post-manufacture trimming. |
| Initial Tolerance | ±1% at 25°C; reduces system-level gain error in precision ADC references and sensor signal chains. |
| Dynamic Impedance | 1 Ω at 100 μA; ensures minimal output voltage shift under load transients in regulated power rails. |
| Temperature Coefficient | 30 ppm/°C (X-suffix); limits reference drift to <±2.1 mV over full 0°C–70°C operating range. |
| Operating Current Range | 10 μA to 20 mA; supports ultra-low-power modes (e.g., 30 μA standby in 9V battery references) and higher-current regulator biasing. |
| Long-Term Stability | 20 ppm/1000 hr; guarantees predictable reference accuracy over years in field-deployed measurement equipment. |
| Wideband Noise | 60 μVrms (10 Hz–10 kHz); avoids introducing measurable noise into high-resolution data acquisition front-ends. |
Pinout & Package
LM385BM-1.2/NOPB is housed in an 8-pin SOIC package (Package Drawing D, JEDEC MS-012 variation AA), 3.91 mm × 4.90 mm footprint, 1.75 mm max height, RoHS-compliant matte tin lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Input) | Connects to higher-potential node; reverse-biased during normal reference operation. |
| Pin 2 | Cathode (Output) | Provides stable 1.235 V reference voltage; requires external current-limiting resistor. |
| Pins 3–8 | No Connect / Die Attach Pad | Internally connected to die attach pad; TI recommends connecting to Pin 2 (cathode) or leaving floating per datasheet Figure 3. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | Functional down to 10 μA-analogous to 12.4 μW at 1.235 V-enabling multi-year battery life in portable meters. |
| Capacitive loading immunity | Stable with ≥1 μF output capacitance; eliminates need for isolation resistors in noisy environments. |
| Low dynamic impedance | 1 Ω ensures ≤10 mV output deviation under 10 mA load steps-critical for precision DAC buffers. |
| On-chip trimming | Factory-laser-trimmed voltage and tempco eliminate manual calibration in production test flows. |
| Hermetic-grade stability | 20 ppm/1000 hr aging rate matches ceramic-packaged references-suitable for metrology-grade instruments. |
Applications
| Portable Multimeter Reference | Low-Power Sensor Signal Chain |
|---|---|
|
Use Scenario: High-impedance 3½-digit handheld multimeter requiring stable reference for autoranging ADC. IC Role / Device Role / Timing Role: 2-terminal shunt reference providing 1.235 V基准 for internal 2.5 V rail generation and ADC offset calibration. Use Value: ±1% tolerance and 30 ppm/°C drift ensure <±0.05% full-scale reading accuracy across 0°C–40°C ambient. |
Use Scenario: Battery-powered environmental sensor node measuring temperature/humidity with 16-bit SAR ADC. IC Role / Device Role / Timing Role: Precision voltage reference for ADC reference input and sensor excitation current source. Use Value: 10 μA minimum operating current enables >5-year battery life; 60 μVrms noise preserves ENOB in 16-bit conversion. |
| Thermocouple Cold-Junction Compensation | Micropower 1–10 mA Current Source |
|
Use Scenario: Industrial thermocouple interface module compensating for cold-junction temperature in 0°C–100°C range. IC Role / Device Role / Timing Role: Stable 1.235 V reference driving precision op-amp circuit that generates Kelvin-proportional compensation voltage. Use Value: 20 ppm/1000 hr stability prevents calibration drift in unattended monitoring systems over 2+ years. |
Use Scenario: Calibration-grade current source for testing transducer outputs or sourcing LED bias in optical sensors. IC Role / Device Role / Timing Role: Shunt reference establishing precise voltage across sense resistor to define output current (IOUT = VREF/RSENSE). Use Value: 1 Ω dynamic impedance ensures current accuracy remains within ±0.1% despite supply ripple or load capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BXM-1.2/NOPB | Same SOIC-8 package, ±2% initial tolerance, 50 ppm/°C tempco (Y-suffix), 10 μA–20 mA range. | Lower accuracy and higher drift; suitable where cost sensitivity outweighs precision requirements. | Select when ±2% reference error is acceptable and budget constraints preclude ±1% grade. |
| LM385M-1.2/NOPB | SOIC-8, ±2% tolerance, 150 ppm/°C tempco (standard suffix), identical operating current range. | Higher thermal drift limits use to ambient-stable environments; not recommended for wide-temperature industrial sensing. | Choose only for non-critical applications where reference stability beyond ±5 mV over temperature is unnecessary. |
Compared with LM385BXM-1.2/NOPB and LM385M-1.2/NOPB, the LM385BM-1.2/NOPB delivers superior initial accuracy and thermal stability-enabling tighter system-level tolerances in portable instrumentation and sensor interfaces without additional calibration overhead.
Availability
LM385BM-1.2/NOPB is available at Aetrix Electronics and suitable for portable multimeters, battery-powered sensor nodes, thermocouple compensators, and micropower current sources requiring stable component supply with guaranteed long-term availability.
Supply support for LM385BM-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, embedded processing, and connectivity technologies, with decades of expertise in precision analog ICs and reference solutions.
The LM385 family was designed specifically for micropower, high-stability voltage reference applications in portable, battery-operated, and industrial measurement systems-emphasizing low drift, low noise, and wide operating current flexibility.
FAQ
What is the exact reference voltage and tolerance of LM385BM-1.2/NOPB?
The LM385BM-1.2/NOPB delivers a nominal reference voltage of 1.235 V with a guaranteed ±1% initial tolerance at 25°C. This specification is production-tested and applies across the full 0°C to 70°C operating temperature range, ensuring consistent accuracy in consumer-grade instrumentation designs without post-assembly calibration.
Can LM385BM-1.2/NOPB operate from a 1.5 V battery?
Yes-LM385BM-1.2/NOPB can operate from a 1.5 V battery when configured as a shunt reference with appropriate current limiting. Its minimum operating current is 10 μA, and forward voltage drop is negligible in reverse-bias mode; typical application circuits (e.g., Figure 16 in SNVS742E) confirm stable 1.235 V output from single-cell alkaline sources.
What is the maximum capacitive load LM385BM-1.2/NOPB can drive without instability?
The LM385BM-1.2/NOPB is exceptionally tolerant of capacitive loading, remaining stable with output capacitances ≥1 μF. This behavior is confirmed in the datasheet's "Features" section and enables direct connection to large bypass caps in noisy environments-no series isolation resistor required for stability.
How does the SOIC-8 package of LM385BM-1.2/NOPB affect thermal performance?
The SOIC-8 package of LM385BM-1.2/NOPB has a junction-to-ambient thermal resistance (θJA) of 165°C/W. At 1 mA operating current (1.235 mW dissipation), this results in ~0.2°C junction rise above ambient-ensuring negligible self-heating impact on reference accuracy in standard PCB layouts with moderate copper area.
Is LM385BM-1.2/NOPB pin-compatible with other LM385 variants in SOIC-8?
Yes-LM385BM-1.2/NOPB shares identical SOIC-8 pinout (Package Drawing D) and terminal configuration (Pin 1 = anode, Pin 2 = cathode, Pins 3–8 = NC/DAP) with all other LM385-x.x/NOPB SOIC variants, including LM385BXM-1.2/NOPB and LM385M-1.2/NOPB, enabling drop-in replacement within the same package footprint.
LM385BM-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:
- ±1%
- 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
LM385BM-1.2/NOPB FAQ
1.How can I place an order for LM385BM-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BM-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 LM385BM-1.2/NOPB reliable?
The price and inventory of LM385BM-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 LM385BM-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM385BM-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BM-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BM-1.2/NOPB?
LM385BM-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BM-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 LM385BM-1.2/NOPB?
For technical support, including LM385BM-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BM-1.2/NOPB requirements.
6.How does Aetrix verify that LM385BM-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385BM-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 LM385BM-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM385BM-1.2/NOPB?
All LM385BM-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385BM-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 LM385BM-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM385BM-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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