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Texas Instruments LM385BXMX-1.2/NOPB
- Part No.:
- LM385BXMX-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385BXMX-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,976
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Product details
Overview
LM385BXMX-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 10 μA to 20 mA current range and enables ultra-low-power applications such as portable battery-powered meters and precision current sources.
For engineers reviewing the LM385BXMX-1.2/NOPB datasheet, LM385BXMX-1.2/NOPB pinout, LM385BXMX-1.2/NOPB application, or LM385BXMX-1.2/NOPB equivalent, key selection criteria include its SOIC-8 package compatibility, tight initial voltage accuracy, low operating current capability down to 10 μA, and stable performance under capacitive loading-critical for high-precision analog front-ends and energy-constrained sensor nodes.
Technical Context
The LM385BXMX-1.2/NOPB uses an on-chip trimmed band-gap architecture to achieve stable 1.235 V reference voltage without external components. Its two-terminal configuration simplifies integration into biasing, calibration, and current-source circuits while maintaining low noise (60 μVrms, 10 Hz–10 kHz) and excellent long-term stability (20 ppm/1000 hr).
Designed for operation from 0°C to 70°C, it features wide dynamic current range (10 μA–20 mA), enabling use in both micropower standby modes and higher-current regulation stages. The SOIC-8 package supports surface-mount assembly with JEDEC MS-012 compliance and RoHS-compliant Sn lead finish.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; tight ±1% initial tolerance ensures accurate ADC/DAC reference or sensor excitation without trimming. |
| Initial Tolerance | ±1% at 25°C; reduces system calibration burden in portable instrumentation and data loggers. |
| Operating Current Range | 10 μA to 20 mA; supports micropower sleep states and active regulation in single-supply systems. |
| Dynamic Impedance | 1 Ω at 100 μA; minimizes output voltage shift under load transients in precision current mirrors. |
| Temp. Coefficient | 30 ppm/°C (X-suffix); maintains <±2 mV drift over full 0°C–70°C range for industrial-grade accuracy. |
| Long-Term Stability | 20 ppm/1000 hr; ensures reliable calibration integrity in medical and test equipment over years of operation. |
| Noise (10 Hz–10 kHz) | 60 μVrms; avoids signal degradation in low-level analog signal chains and thermocouple interfaces. |
Pinout & Package
LM385BXMX-1.2/NOPB is housed in an 8-pin SOIC package (JEDEC MS-012, drawing D), 3.91 mm × 4.90 mm footprint, 1.75 mm max height, with Sn lead finish and moisture sensitivity level (MSL) 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Input) | Connects to higher-potential supply rail; reverse-biased operation establishes reference voltage at cathode. |
| Pin 2 | Cathode (Output) | Provides regulated 1.235 V reference; requires no external capacitor for stability due to inherent capacitive-load tolerance. |
| Pins 3–8 | NC / Die Attach Pad | Not internally connected; pins 3–8 are electrically isolated and may be left unconnected or grounded for thermal relief. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive-load immunity | Stable with unlimited output capacitance-eliminates need for series resistance or external compensation in battery-monitoring circuits. |
| Micropower operation | Functional down to 10 μA supply current-enables >10-year shelf-life battery operation in IoT endpoint sensors. |
| Low-noise reference | 60 μVrms broadband noise-preserves SNR in 16-bit+ data acquisition systems without post-filtering. |
| On-chip trimming | Factory-laser-trimmed voltage-removes manual calibration steps in production test for handheld multimeters. |
| Wide current range | 10 μA–20 mA operation-supports dual-mode designs: ultra-low-power sleep (e.g., 15 μA) and active regulation (e.g., 10 mA). |
Applications
| Portable Battery-Powered Meters | Precision Current Sources |
|---|---|
Use Scenario: Handheld digital multimeters powered by 9 V alkaline batteries requiring stable reference for 4½-digit ADC conversion. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing 1.235 V基准 for ADC internal reference buffer and analog front-end gain calibration. Use Value: ±1% initial tolerance and 30 ppm/°C TC enable <±0.02% full-scale accuracy over 0°C–40°C ambient without recalibration. | Use Scenario: Programmable 1 μA–1 mA current source for RTD or thermistor biasing in environmental monitoring nodes. IC Role / Device Role / Timing Role: Precision voltage reference establishing setpoint for op-amp-controlled MOSFET current mirror. Use Value: 1 Ω dynamic impedance ensures <0.1% current error across 10 μA–20 mA operating range, critical for sub-0.1°C temperature resolution. |
| Micropower Thermometer | Cold-Junction Compensation |
Use Scenario: Low-power 0°C–100°C thermometer using LM385BXMX-1.2/NOPB to generate 1 μA/K current through sensing resistor. IC Role / Device Role / Timing Role: Micropower reference enabling direct Kelvin-to-current conversion with <50 μA total circuit quiescent current. Use Value: 10 μA minimum operating current allows continuous measurement from coin-cell batteries for >5 years. | Use Scenario: Thermocouple interface in industrial data loggers requiring cold-junction compensation at <100 μA total supply current. IC Role / Device Role / Timing Role: Stable 1.235 V reference driving precision current source that heats thermistor to match junction temperature. Use Value: 20 ppm/1000 hr long-term stability prevents drift-induced offset errors exceeding ±0.5°C/year in unattended deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 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%, but wider temp range (0°C–70°C) and higher thermal resistance (440°C/W vs. 165°C/W). | Suitable for through-hole prototyping or space-constrained PCBs where SOIC reflow is unavailable. | Select when manual assembly or legacy board compatibility is required; avoid in thermally dense layouts. |
| REF3012AIDBZR | 1.2 V output, ±0.2% initial tolerance, 50 ppm/°C TC, SOT-23-3, 50 μA typical quiescent current. | Better accuracy and smaller footprint, but higher min operating current (50 μA) limits ultra-low-power use cases. | Choose for higher-accuracy portable instruments where 10 μA operation is not mandatory. |
Compared with LM385BZ-1.2/NOPB, LM385BXMX-1.2/NOPB offers superior thermal performance and automated assembly compatibility; versus REF3012AIDBZR, it trades tighter initial tolerance for significantly lower operating current-making it optimal for multi-year battery life in remote sensing nodes.
Availability
LM385BXMX-1.2/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, precision current sourcing, battery-powered thermometers, and cold-junction compensation circuits requiring stable component supply and long-term calibration integrity.
Supply support for LM385BXMX-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 voltage references and power management ICs.
The LM385 family was designed specifically for micropower, high-stability voltage referencing in portable, battery-operated, and industrial measurement systems-emphasizing low drift, capacitive-load robustness, and wide operating current flexibility.
FAQ
What is the exact reference voltage and tolerance of LM385BXMX-1.2/NOPB?
The LM385BXMX-1.2/NOPB delivers a nominal reference voltage of 1.235 V with ±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 performance in commercial-grade instrumentation without post-manufacture trimming.
Can LM385BXMX-1.2/NOPB operate at 10 μA, and what is its behavior below that current?
Yes, LM385BXMX-1.2/NOPB is fully specified to operate down to 10 μA, with guaranteed regulation and dynamic impedance. Operation below 10 μA is not characterized-voltage accuracy degrades, and regulation may collapse. For ultra-low-current applications, TI recommends verifying performance empirically or selecting alternatives like REF3012 with lower quiescent current.
Is LM385BXMX-1.2/NOPB compatible with capacitive loads, and does it require an output capacitor?
Yes, LM385BXMX-1.2/NOPB is exceptionally tolerant of capacitive loading due to its internal design-no output capacitor is required for stability, even with >10 μF ceramic or tantalum capacitors. This eliminates risk of oscillation in battery-monitoring circuits and simplifies layout in space-constrained PCBs.
What is the temperature coefficient of LM385BXMX-1.2/NOPB, and how does it affect accuracy over temperature?
The LM385BXMX-1.2/NOPB has a maximum average temperature coefficient of 30 ppm/°C (X-suffix). Over its 0°C to 70°C operating range, this results in ≤2.1 mV total drift (1.235 V × 30 ppm/°C × 70°C), supporting ±0.02% full-scale accuracy in precision analog systems without software compensation.
How does the SOIC-8 package of LM385BXMX-1.2/NOPB compare thermally to TO-92 versions like LM385BXZ-1.2/NOPB?
LM385BXMX-1.2/NOPB in SOIC-8 has a junction-to-ambient thermal resistance (θJA) of 165°C/W, significantly lower than the 440°C/W of the TO-92 variant LM385BXZ-1.2/NOPB. This enables higher power dissipation and better thermal stability in densely populated boards-critical for sustained 20 mA operation in compact sensor modules.
LM385BXMX-1.2/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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:
- 30ppm/°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
LM385BXMX-1.2/NOPB FAQ
1.How can I place an order for LM385BXMX-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BXMX-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 LM385BXMX-1.2/NOPB reliable?
The price and inventory of LM385BXMX-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 LM385BXMX-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM385BXMX-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BXMX-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BXMX-1.2/NOPB?
LM385BXMX-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BXMX-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 LM385BXMX-1.2/NOPB?
For technical support, including LM385BXMX-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BXMX-1.2/NOPB requirements.
6.How does Aetrix verify that LM385BXMX-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385BXMX-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 LM385BXMX-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM385BXMX-1.2/NOPB?
All LM385BXMX-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385BXMX-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 LM385BXMX-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM385BXMX-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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