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Texas Instruments LM385BYMX-1.2/NOPB
- Part No.:
- LM385BYMX-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385BYMX-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,220
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Product details
Overview
LM385BYMX-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, 50 ppm/°C temperature coefficient (Y-suffix), and 1 Ω dynamic impedance across 10 μA–20 mA operating current. It serves as a stable low-voltage reference in battery-powered instrumentation, portable meters, and precision analog circuits where ultra-low quiescent current (<30 μA) and long-term stability are critical.
For engineers reviewing the LM385BYMX-1.2/NOPB datasheet, LM385BYMX-1.2/NOPB pinout, LM385BYMX-1.2/NOPB application, or LM385BYMX-1.2/NOPB equivalent, this page provides verified technical context, SOIC-8 package details, real-world use cases in thermometry and micropower regulation, and two validated alternative parts with documented parameter and application differences.
Technical Context
The LM385BYMX-1.2/NOPB implements a band-gap reference architecture using only transistors and resistors, enabling low noise (60 μVrms, 10 Hz–10 kHz), excellent long-term stability (20 ppm over 1000 hours), and robust capacitive loading tolerance. Its 2-terminal configuration simplifies layout and eliminates external bias components.
Designed for the 0°C to 70°C industrial temperature range, it achieves tight voltage regulation via on-chip trimming and maintains <1.5 mV reverse breakdown voltage change over 10 μA–1 mA current variation. The SOIC-8 package supports surface-mount assembly with JEDEC MS-012 compliance and RoHS/Green finish.
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 voltage. |
| Initial Tolerance | ±1% (B-grade); reduces calibration overhead in production test for portable medical and metering devices. |
| Temperature Coefficient | 50 ppm/°C (Y-suffix); ensures ≤3.5 mV drift over full 0°C–70°C range for stable operation in uncontrolled environments. |
| Dynamic Impedance | 1 Ω at 100 μA; minimizes load-induced voltage sag during transient current demands in precision current sources. |
| Operating Current Range | 10 μA to 20 mA; supports micropower sleep modes (e.g., 1.5 V battery reference) and higher-current regulator feedback paths. |
| Long-Term Stability | 20 ppm over 1000 hours; guarantees minimal calibration drift in field-deployed equipment requiring multi-year accuracy. |
Pinout & Package
LM385BYMX-1.2/NOPB is housed in an 8-pin SOIC package (JEDEC MS-012, TI drawing D) with 1.27 mm pitch and 1.75 mm max height. Pin 1 is marked by a beveled corner; pins 1–4 form one side, pins 5–8 the opposite. The device uses a 2-terminal topology: only Anode (Pin 1) and Cathode (Pin 8) are electrically active; all other pins are NC (no connect) and must remain unconnected per TI design guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Active terminal; connects to lowest potential node (e.g., ground or negative rail) in reference configuration. |
| Pin 8 | Cathode | Active terminal; delivers regulated 1.235 V when reverse-biased; requires series resistor for current setting. |
| Pins 2–7 | No Connect (NC) | Internally unconnected; must be left floating-no routing, grounding, or capacitive coupling permitted. |
Key Features
| Feature | Design Value |
|---|---|
| 2-terminal band-gap architecture | Eliminates need for external bias circuitry-reduces BOM count and PCB area in space-constrained designs. |
| Capacitive loading tolerance | Stable with ≥1 μF output capacitance-enables direct connection to ADC reference inputs without isolation resistors. |
| Low wideband noise | 60 μVrms (10 Hz–10 kHz)-preserves signal integrity in high-resolution data acquisition systems. |
| Micropower operation | 10 μA minimum operating current-extends battery life in wireless sensors and handheld instruments beyond shelf life. |
| On-chip trimmed voltage | ±1% initial accuracy without external calibration-lowers manufacturing test time and cost for volume production. |
Applications
| Portable Thermometer Calibration | Micropower Battery Reference |
|---|---|
|
Use Scenario: Centigrade thermometer spanning 0°C–100°C using LM385BYMX-1.2/NOPB as Kelvin-scale current source (1.8 μA/°K). IC Role / Device Role / Timing Role: Precision 2-terminal voltage reference generating stable bias for thermistor or RTD interface circuitry. Use Value: Enables sub-0.5°C measurement accuracy with no external trim pots-reducing calibration labor and component count. |
Use Scenario: Reference for 9 V battery-powered multimeter with standby current <30 μA. IC Role / Device Role / Timing Role: Low-drift voltage reference establishing ADC full-scale input in portable test equipment. Use Value: Delivers 1.235 V ±1% over battery discharge (9 V → 6 V), maintaining measurement linearity without recalibration. |
| Thermocouple Cold-Junction Compensation | Micropower 5 V Regulator Feedback |
|
Use Scenario: Cold-junction compensator for Type J/K thermocouples in industrial data loggers. IC Role / Device Role / Timing Role: Stable 1.235 V reference driving precision current source that matches thermocouple Seebeck coefficient. Use Value: Achieves ≤1°C cold-junction error over 0°C–70°C-meeting ASTM E230 Class 2 accuracy requirements. |
Use Scenario: Feedback reference for adjustable LDO regulating 5 V from 9 V battery with <50 μA quiescent current. IC Role / Device Role / Timing Role: Micropower voltage reference setting output voltage via resistor divider in regulator feedback loop. Use Value: Enables 5 V output stability of ±0.5% over temperature and line/load variations-critical for MCU power domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BMX-1.2/NOPB | ±2% initial tolerance, 150 ppm/°C tempco (standard grade), same SOIC-8 package and 1.235 V nominal output. | Suitable for cost-sensitive applications where ±2% accuracy suffices (e.g., non-critical sensor biasing). | Select when budget constraints outweigh precision requirements and long-term drift is less critical. |
| LM385BXMX-1.2/NOPB | ±1% tolerance, 30 ppm/°C tempco (X-suffix), identical SOIC-8 footprint and electrical interface. | Better suited for high-accuracy applications like laboratory-grade instrumentation requiring tighter thermal stability. | Choose when lower temperature drift (≤2.1 mV over 0°C–70°C) justifies premium over Y-suffix variant. |
Compared with LM385BYMX-1.2/NOPB, LM385BMX-1.2/NOPB trades ±1% tolerance and 50 ppm/°C stability for lower cost, while LM385BXMX-1.2/NOPB improves thermal drift by 40% at the expense of slightly higher unit price-enabling tiered selection based on accuracy vs. budget trade-offs.
Availability
LM385BYMX-1.2/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensors, and precision analog circuits requiring stable component supply with guaranteed long-term availability and RoHS-compliant sourcing.
Supply support for LM385BYMX-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 engineered specifically for micropower, low-voltage reference applications in portable and battery-operated systems-prioritizing ultra-low current consumption, tight initial accuracy, and robust thermal performance over wide operating ranges.
FAQ
What is the operating temperature range for LM385BYMX-1.2/NOPB?
The LM385BYMX-1.2/NOPB is rated for operation from 0°C to +70°C, matching the LM385-1.2-N industrial grade specification. This range is confirmed in TI's SNVS742E datasheet and Package Option Addendum, and defines its suitability for commercial and industrial ambient environments-not extended or automotive grades.
Does LM385BYMX-1.2/NOPB require external components to function?
Yes-LM385BYMX-1.2/NOPB is a 2-terminal shunt reference and requires an external series current-setting resistor between the supply and its cathode (Pin 8). Anode (Pin 1) connects to ground or the lowest system potential. No additional capacitors or bias networks are needed for basic operation, though a 1 μF bypass capacitor is recommended for noise-sensitive applications.
What does the "Y" suffix in LM385BYMX-1.2/NOPB indicate?
The "Y" suffix denotes a temperature coefficient of 50 ppm/°C, as specified in the Electrical Characteristics table of SNVS742E. This is tighter than the standard "no-suffix" (150 ppm/°C) and looser than the "X" suffix (30 ppm/°C), positioning LM385BYMX-1.2/NOPB for mid-tier precision applications where thermal stability matters but extreme accuracy is not required.
Can LM385BYMX-1.2/NOPB replace LM385-1.2-N in TO-92 packages?
Functionally yes-but not mechanically. LM385BYMX-1.2/NOPB uses an SOIC-8 package with Pins 1 (Anode) and 8 (Cathode) active, whereas TO-92 variants (e.g., LM385BYZ-1.2/NOPB) have 3 leads with Anode/Cathode/NC. PCB layout, thermal design, and soldering profiles differ significantly; redesign is required for package substitution.
What is the maximum reverse current rating for LM385BYMX-1.2/NOPB?
The absolute maximum reverse current for LM385BYMX-1.2/NOPB is 30 mA, as stated in the Absolute Maximum Ratings table of SNVS742E. Operating continuously above 20 mA may degrade long-term stability; TI recommends staying within the 10 μA–20 mA functional range for optimal performance and reliability.
LM385BYMX-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:
- 50ppm/°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
LM385BYMX-1.2/NOPB FAQ
1.How can I place an order for LM385BYMX-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BYMX-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 LM385BYMX-1.2/NOPB reliable?
The price and inventory of LM385BYMX-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 LM385BYMX-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM385BYMX-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BYMX-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BYMX-1.2/NOPB?
LM385BYMX-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BYMX-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 LM385BYMX-1.2/NOPB?
For technical support, including LM385BYMX-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BYMX-1.2/NOPB requirements.
6.How does Aetrix verify that LM385BYMX-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385BYMX-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 LM385BYMX-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM385BYMX-1.2/NOPB?
All LM385BYMX-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385BYMX-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 LM385BYMX-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM385BYMX-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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