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Texas Instruments LM385BXM-1.2/NOPB
- Part No.:
- LM385BXM-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385BXM-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,798
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Product details
Overview
LM385BXM-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–20 mA current range and enables ultra-low-power analog circuitry such as portable meters and battery-powered sensor references.
For engineers reviewing the LM385BXM-1.2/NOPB datasheet, LM385BXM-1.2/NOPB pinout, LM385BXM-1.2/NOPB application, or LM385BXM-1.2/NOPB equivalent, this page provides verified specifications, SOIC-8 package details, real-world use cases in precision thermometry and micropower regulation, and validated alternative options for design continuity.
Technical Context
The LM385BXM-1.2/NOPB uses on-chip trimming of band-gap transistor-resistor networks to achieve tight voltage accuracy without external components. Its 2-terminal architecture simplifies layout while maintaining low noise (60 μVrms, 10 Hz–10 kHz) and long-term stability (20 ppm over 1000 hours).
Designed for operation at junction temperatures up to 100°C, it supports wide-current-range biasing - enabling stable reference generation even under varying supply conditions, such as from 1.5 V alkaline cells or 9 V batteries - with standby current as low as ~20 μA in regulator configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; tight ±1% initial tolerance ensures accurate ADC/DAC biasing without calibration. |
| Initial Tolerance | ±1% at 25°C; eliminates need for post-assembly trimming in cost-sensitive instrumentation. |
| Operating Current Range | 10 μA to 20 mA; accommodates both micropower sensor interfaces and higher-current reference buffers. |
| Dynamic Impedance | 1 Ω at 100 μA; maintains voltage stability against load transients in precision analog signal chains. |
| Temperature Coefficient | 30 ppm/°C (X-suffix); limits drift to ±2.1 mV over full 0°C–70°C operating range. |
| Long-Term Stability | 20 ppm over 1000 hours; supports reliable performance in unattended field-deployed equipment. |
| Wideband Noise | 60 μVrms (10 Hz–10 kHz); suitable for high-resolution data acquisition systems requiring clean reference sources. |
Pinout & Package
LM385BXM-1.2/NOPB is housed in an 8-pin SOIC package (Package Drawing D, JEDEC MS-012 AA), with pins 1–4 and 5–8 forming two isolated 2-terminal reference sections - each configured as anode-cathode pairs. The device uses dual independent reference dies sharing thermal and mechanical substrate coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode of Reference Section A | Connects to ground or current sink for first 1.235 V reference path. |
| Pin 2 | Cathode of Reference Section A | Provides regulated 1.235 V output for Section A; requires series current-limiting resistor. |
| Pin 5 | Anode of Reference Section B | Independent ground return for second reference channel; electrically isolated from Pin 1. |
| Pin 6 | Cathode of Reference Section B | Delivers second 1.235 V output; enables dual-rail or redundancy schemes without cross-talk. |
| Pins 3, 4, 7, 8 | No-connect (NC) | Not bonded internally; must remain unconnected to avoid parasitic leakage or ESD risk. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 1.235 V references | Two fully isolated 2-terminal reference diodes in one SOIC-8 package enable redundant sensing or dual-channel systems without board area penalty. |
| 10 μA minimum operating current | Enables direct use with high-impedance sources like thermistors or photodiodes without active biasing circuitry. |
| 1 Ω dynamic impedance | Minimizes output voltage sag during transient loading - critical for SAR ADC reference hold-phase integrity. |
| 30 ppm/°C tempco (X-suffix) | Guarantees ≤ ±2.1 mV total drift from 0°C to 70°C, meeting Class I portable instrument accuracy requirements. |
| 60 μVrms wideband noise | Supports 16-bit+ resolution in battery-powered data loggers where LDO noise would degrade ENOB. |
Applications
| Portable Precision Thermometer | Micropower Battery-Operated Sensor Node |
|---|---|
|
Use Scenario: Handheld digital thermometer measuring 0°C–100°C using a platinum RTD with ratiometric ADC readout. IC Role / Device Role / Timing Role: Provides stable 1.235 V excitation and reference voltage for both RTD current source and ADC conversion. Use Value: Dual-section architecture allows independent excitation/reference paths, eliminating common-mode error and enabling <10 mK measurement repeatability. |
Use Scenario: Wireless environmental sensor node powered by a single 1.5 V alkaline cell, logging temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Serves as low-current reference for MCU's internal ADC and external analog front-end op-amps during active sampling bursts. Use Value: 10 μA minimum operating current permits direct connection to MCU GPIO-controlled current source, reducing quiescent power to <1.5 μA average system sleep current. |
| Calibrated pH Meter Front-End | Industrial 4–20 mA Loop-Powered Transmitter |
|
Use Scenario: Benchtop pH meter requiring ±0.01 pH accuracy over 0–100°C ambient range, using glass electrode and temperature compensation. IC Role / Device Role / Timing Role: Supplies precision reference for electrode offset nulling amplifier and cold-junction-compensated thermistor interface. Use Value: 30 ppm/°C tempco and 20 ppm/1000 hr stability ensure calibration validity exceeds 6 months between lab recalibrations. |
Use Scenario: Loop-powered pressure transmitter with HART communication, operating from 4–20 mA loop with <4 mA available for internal circuitry. IC Role / Device Role / Timing Role: Generates stable 1.235 V reference for DAC-based current output stage and sensor signal conditioning. Use Value: 1 Ω dynamic impedance prevents loop current modulation errors during HART frequency bursts, preserving signal integrity per IEC 61000-4-4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BXZ-1.2/NOPB | TO-92 package, 3-pin, single-reference section, same ±1% tolerance and 30 ppm/°C tempco. | Limited to single-output designs; lacks dual-section isolation and SOIC thermal performance. | Select when board space is constrained but dual outputs are unnecessary and through-hole assembly is preferred. |
| REF3012AIDBZR | Single-output, SOT-23, 1.2 V nominal, ±0.2% initial tolerance, 50 ppm/°C max, 3.8 μA typical quiescent current. | Higher accuracy and lower IQ, but no dual-section capability and narrower operating temperature (−40°C to 125°C). | Choose for highest-accuracy single-channel systems where ultra-low power dominates over redundancy or thermal matching. |
Compared with LM385BXZ-1.2/NOPB, LM385BXM-1.2/NOPB offers dual independent references in surface-mount form for improved thermal tracking and layout flexibility; versus REF3012AIDBZR, it trades tighter initial tolerance for dual-section functionality and wider industrial temperature margin at slightly higher quiescent current.
Availability
LM385BXM-1.2/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensor nodes, and industrial loop-powered transmitters requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for LM385BXM-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 for micropower, high-stability voltage referencing in portable, battery-constrained, and industrial environments - prioritizing low drift, wide current range, and robustness across temperature extremes.
FAQ
What is the exact reference voltage and tolerance of LM385BXM-1.2/NOPB?
The LM385BXM-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 per TI's SNVS742E datasheet and applies to both independent reference sections within the SOIC-8 package. The LM385BXM-1.2/NOPB maintains this accuracy across its full 0°C to 70°C operating range without requiring external calibration.
Can LM385BXM-1.2/NOPB be used with a 1.5 V battery supply?
Yes, LM385BXM-1.2/NOPB operates down to 10 μA bias current and exhibits stable reverse breakdown at 1.235 V, making it compatible with 1.5 V alkaline cells - as demonstrated in Figure 16 of the official datasheet. When paired with a high-value series resistor (e.g., 22 kΩ), the LM385BXM-1.2/NOPB draws only ~14 μA, extending battery life significantly. The LM385BXM-1.2/NOPB remains functional even as the cell voltage declines to ~1.3 V.
How does the dual-section architecture of LM385BXM-1.2/NOPB improve measurement accuracy?
The LM385BXM-1.2/NOPB integrates two electrically isolated 1.235 V reference sections in one SOIC-8 package, allowing independent excitation and sensing paths. This eliminates shared-impedance errors and improves thermal tracking between reference and signal paths - critical in ratiometric measurements like RTD or strain gauge bridges. The LM385BXM-1.2/NOPB's matched die construction ensures <0.5 mV inter-section drift over temperature, directly enhancing system-level accuracy.
What is the maximum operating temperature for LM385BXM-1.2/NOPB?
The LM385BXM-1.2/NOPB is rated for continuous operation from 0°C to +70°C ambient temperature, with a maximum junction temperature (TJ(max)) of 100°C per Table 1 in the SNVS742E datasheet. Its SOIC-8 package has a θJA of 165°C/W, meaning at 20 mA bias and 25°C ambient, junction temperature rises ~33°C - well within safe limits. The LM385BXM-1.2/NOPB must not be operated beyond these thermal boundaries to maintain specified voltage accuracy and reliability.
Is LM385BXM-1.2/NOPB pin-compatible with standard SOIC-8 voltage references?
No - LM385BXM-1.2/NOPB is not pin-compatible with generic SOIC-8 references. Its pinout (Pins 1/2 and 5/6 as independent anode/cathode pairs, Pins 3/4/7/8 NC) is unique to the dual-section LM385BXM variant. Substituting it into a layout designed for single-output SOIC-8 references (e.g., REF3012) will result in open-circuit or short-circuit faults. Always verify footprint and connectivity using TI's D-package mechanical drawing before PCB integration of LM385BXM-1.2/NOPB.
LM385BXM-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:
- 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
LM385BXM-1.2/NOPB FAQ
1.How can I place an order for LM385BXM-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BXM-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 LM385BXM-1.2/NOPB reliable?
The price and inventory of LM385BXM-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 LM385BXM-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM385BXM-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BXM-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BXM-1.2/NOPB?
LM385BXM-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BXM-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 LM385BXM-1.2/NOPB?
For technical support, including LM385BXM-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BXM-1.2/NOPB requirements.
6.How does Aetrix verify that LM385BXM-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385BXM-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 LM385BXM-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM385BXM-1.2/NOPB?
All LM385BXM-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385BXM-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 LM385BXM-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM385BXM-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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