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Texas Instruments LM385MX/NOPB
- Part No.:
- LM385MX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385MX/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 2% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,540
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Product details
Overview
LM385MX/NOPB from Texas Instruments is a 3-terminal adjustable micropower band-gap voltage reference diode, operating from 1.24 V to 5.30 V with 1% initial tolerance, 1 Ω dynamic impedance, and 30 ppm/°C max temperature coefficient over 0°C to 70°C. It delivers stable precision biasing in battery-powered instrumentation and low-power analog circuits.
For engineers reviewing the LM385MX/NOPB datasheet, LM385MX/NOPB pinout, LM385MX/NOPB application, or LM385MX/NOPB equivalent, this page provides verified specifications, SOIC-8 package details, real-world use cases, and validated alternative parts for design-in decisions under industrial temperature constraints.
Technical Context
The LM385MX/NOPB implements a band-gap reference core using only transistors and resistors-enabling low noise (50 μVRMS at 10 Hz–10 kHz), excellent long-term stability (20 ppm/1000 h), and tolerance to capacitive loading without external compensation. Its feedback current remains below 25 nA across temperature.
Designed for shunt-mode operation, it functions as a two-terminal device when used with an external resistor but operates as a three-terminal reference when configured with adjustable output via RADJ. Minimum operating current is 7 μA at VOUT = VREF, rising to 35 μA at 5.3 V output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage Range | 1.24 V to 5.30 V - Adjustable output set by external resistor divider; enables flexible system-level voltage scaling. |
| Initial Tolerance | ±1% - Tight factory-trimmed accuracy reduces need for post-assembly calibration in precision analog designs. |
| Dynamic Impedance | 1 Ω - Low AC output impedance ensures minimal load-induced voltage shift during transient current demands. |
| Temperature Coefficient | 30 ppm/°C max - Predictable drift over 0°C to 70°C supports stable performance in commercial-grade embedded systems. |
| Operating Current Range | 7 μA to 60 μA - Ultra-low quiescent current extends battery life in portable meters and sensor nodes. |
| Output Noise (10 Hz–10 kHz) | 50 μVRMS - Low broadband noise preserves signal integrity in high-resolution ADC references and precision comparators. |
| Long-Term Stability | 20 ppm/1000 h - Minimal aging drift ensures consistent reference accuracy over years of field operation. |
Pinout & Package
LM385MX/NOPB is housed in an 8-pin SOIC (D) package with 1.27 mm pitch, 3.91 mm width, and 1.75 mm max height. Pin 1 is located at the top-left corner with a beveled edge indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Current sink node; connects to system ground or negative rail in shunt configuration. |
| Pin 2 | Cathode | Reference output node; supplies regulated voltage to load or feedback network. |
| Pins 3–8 | No Connect / Internally Unused | Unused terminals; must remain unconnected per TI design guidance to avoid parametric degradation. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥100 nF output capacitance - eliminates need for series isolation resistor in noisy environments. |
| Low Feedback Current | ≤25 nA - Minimizes error in high-impedance divider networks used for voltage adjustment. |
| Wide Operating Current Range | 7 μA to 60 μA - Supports both ultra-low-power sleep modes and higher-current regulation without redesign. |
| Hermetic Stability | 20 ppm/1000 h aging - Enables long-life deployments in unattended remote sensors and medical devices. |
| ESD Robustness | 2 kV HBM - Reduces handling sensitivity during PCB assembly and field service. |
Applications
| Portable Multimeter Reference | Precision ADC Biasing |
|---|---|
Use Scenario: Battery-powered handheld multimeter requiring stable 2.5 V reference for 16-bit SAR ADC conversion. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation voltage to ADC internal reference buffer. Use Value: 1% initial tolerance and 30 ppm/°C TC ensure <±0.05% full-scale error across 0°C–50°C operating range. |
Use Scenario: Industrial data acquisition module digitizing thermocouple signals with 24-bit delta-sigma ADC. IC Role / Device Role / Timing Role: Precision reference source for ADC's internal PGA and reference input stage. Use Value: 50 μVRMS broadband noise prevents quantization uncertainty in sub-μV resolution measurements. |
| Low-Power Sensor Transmitter | Programmable Shunt Regulator |
Use Scenario: Wireless temperature node powered by coin cell, transmitting via BLE every 60 seconds. IC Role / Device Role / Timing Role: Micropower reference for op-amp signal conditioning and ADC reference path. Use Value: 7 μA minimum operating current allows continuous reference biasing while preserving multi-year battery life. |
Use Scenario: 25 V shunt regulator supplying 1 mA to isolated analog front-end in PLC I/O module. IC Role / Device Role / Timing Role: Adjustable shunt reference configured with external resistor to set precise 25 V clamp point. Use Value: 1 Ω dynamic impedance maintains <±10 mV regulation error despite 100 μA load transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | 2.5 V fixed + adjustable (2.5–36 V); 0.5% tolerance; 0.2 Ω dynamic impedance; 300 μA typical cathode current. | Higher minimum current limits use in ultra-low-power (<10 μA) systems; better for >10 mA loads. | Select TLVH431ACDBVR when tighter tolerance and lower impedance are required, and supply current budget exceeds 300 μA. |
| MAX6126AASA+ | 2.5 V fixed; 0.04% initial tolerance; 3 ppm/°C TC; 1.2 mA supply current; SO-8 package. | Fixed-output only; not adjustable; requires higher quiescent current; superior TC for lab-grade instruments. | Choose MAX6126AASA+ for metrology-grade stability where adjustability is unnecessary and power is not constrained. |
Compared with LM385MX/NOPB, TLVH431ACDBVR offers lower impedance and tighter tolerance but consumes 40× more current; MAX6126AASA+ delivers 10× better temperature coefficient and 25× better initial accuracy, yet sacrifices adjustability and micropower operation.
Availability
LM385MX/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, precision data acquisition, low-power sensor interfaces, and programmable shunt regulation requiring stable component supply across commercial temperature ranges.
Supply support for LM385MX/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 over 50 years of innovation in precision analog ICs.
The LM385MX/NOPB belongs to TI's micropower voltage reference product line, engineered for battery-operated and energy-constrained applications demanding high accuracy, low drift, and robust long-term stability.
FAQ
What is the operating temperature range for LM385MX/NOPB?
The LM385MX/NOPB is rated for operation from 0°C to 70°C. This commercial-grade temperature range is specified in TI's SNVS741F datasheet and aligns with its SOIC packaging and internal trimming process. Operation outside this range may result in increased temperature coefficient error or reduced long-term stability.
Can LM385MX/NOPB be used as a 2-terminal shunt reference?
Yes, LM385MX/NOPB can operate as a 2-terminal shunt reference by connecting Pin 1 (Anode) to ground and Pin 2 (Cathode) to the regulated node. Pins 3–8 must remain unconnected. In this mode, it functions identically to a precision Zener diode with adjustable breakdown voltage set by external resistor networks.
What is the maximum output voltage achievable with LM385MX/NOPB?
The LM385MX/NOPB supports an adjustable output voltage up to 5.30 V, as confirmed in the Electrical Characteristics table of the SNVS741F datasheet. This upper limit is defined by internal band-gap architecture and remains valid across its full 7 μA to 60 μA operating current range.
Does LM385MX/NOPB require an external capacitor for stability?
No, LM385MX/NOPB does not require an external capacitor for stability. Its internal design tolerates capacitive loading up to at least 100 nF, as stated in the Features section of the datasheet. Adding output capacitance improves noise rejection but introduces no phase-margin risk.
How does the feedback current of LM385MX/NOPB affect voltage divider design?
The LM385MX/NOPB has a maximum feedback current of 25 nA, which flows into the ADJ terminal during adjustment. This ultra-low value allows use of high-value resistors (e.g., 1 MΩ–10 MΩ) in the voltage divider without introducing significant error-critical for minimizing power draw in battery-powered LM385MX/NOPB applications.
LM385MX/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:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 5.3 V
- Current - Output:
- 20 mA
- Tolerance:
- ±2%
- Temperature Coefficient:
- 30ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 50µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 55 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM385MX/NOPB FAQ
1.How can I place an order for LM385MX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385MX/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 LM385MX/NOPB reliable?
The price and inventory of LM385MX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM385MX/NOPB is usually 5 days.
3.What payment methods are accepted for LM385MX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385MX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385MX/NOPB?
LM385MX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385MX/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 LM385MX/NOPB?
For technical support, including LM385MX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385MX/NOPB requirements.
6.How does Aetrix verify that LM385MX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385MX/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 LM385MX/NOPB meets industry standards.
7.What is the process for return or replacement of LM385MX/NOPB?
All LM385MX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385MX/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 LM385MX/NOPB part is unused and in its original packaging.
Return procedure for LM385MX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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