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Texas Instruments LM385BMX-1.2/NOPB
- Part No.:
- LM385BMX-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385BMX-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,826
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Product details
Overview
LM385BMX-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 over 0°C to 70°C. It operates from 10 μA to 20 mA reverse current and enables ultra-low-power analog circuitry such as portable battery-powered meters and precision current sources.
For engineers reviewing the LM385BMX-1.2/NOPB datasheet, LM385BMX-1.2/NOPB pinout, LM385BMX-1.2/NOPB application, or LM385BMX-1.2/NOPB equivalent, key selection criteria include its SOIC-8 package, guaranteed low-noise performance (60 μVrms, 10 Hz–10 kHz), long-term stability (20 ppm/1000 hr), and compatibility with capacitive loads without oscillation.
Technical Context
The LM385BMX-1.2/NOPB implements a trimmed band-gap reference core using on-chip transistors and resistors, enabling low noise, excellent long-term stability, and minimal drift across temperature. Its two-terminal architecture eliminates need for external biasing components, simplifying design in space-constrained applications.
It features exceptional capacitive loading tolerance and wide dynamic operating range-supporting stable regulation from 10 μA standby up to 20 mA drive-making it suitable for both micropower sensing front-ends and higher-current reference buffering stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; tight ±1% initial tolerance ensures 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. |
| Operating Current Range | 10 μA to 20 mA; supports ultra-low-power operation (e.g., 1 μA thermocouple compensation) and robust load driving. |
| Dynamic Impedance | 1 Ω at 100 μA; maintains voltage stability under fast load transients in battery-operated instrumentation. |
| Temperature Coefficient | 30 ppm/°C (X-suffix); limits reference drift to <±2.1 mV over full 0°C–70°C industrial range. |
| Wideband Noise | 60 μVrms (10 Hz–10 kHz); preserves SNR in high-resolution data acquisition systems. |
| Long-Term Stability | 20 ppm/1000 hr; ensures calibration integrity in field-deployed test equipment and medical sensors. |
Pinout & Package
LM385BMX-1.2/NOPB is housed in an 8-pin SOIC package (JEDEC MS-012, variation AA) with 1.27 mm pitch, 3.9 mm × 4.9 mm body, and 1.75 mm max height. Pin 1 is marked by a beveled corner; pins 1–4 are on one side, 5–8 on the opposite.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connects to ground or low-side return path; defines cathode-to-anode polarity for reverse-biased operation. |
| Pin 2 | Cathode | Output node delivering regulated 1.235 V; must be decoupled with ≥1 nF capacitor for stability with capacitive loads. |
| Pins 3–8 | No Connect (NC) | Internally unconnected; must remain floating per TI datasheet Figure 3; no electrical function or thermal benefit. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with >100 nF output capacitance-eliminates need for series isolation resistor in battery monitor designs. |
| Low Operating Current | Functional down to 10 μA-enables multi-year operation from coin cells in IoT endpoint sensors. |
| On-Chip Trimmed Voltage | Factory-trimmed to ±1% without external adjustment-reduces BOM count and calibration labor in production test. |
| Low Dynamic Impedance | 1 Ω at 100 μA-minimizes voltage sag during pulsed ADC sampling or DAC settling events. |
| Band-Gap Core Architecture | Transistor/resistor-only topology-ensures low 1/f noise and <20 ppm/1000 hr aging for metrology-grade accuracy. |
Applications
| Portable Battery-Powered Meters | Precision Current Sources |
|---|---|
Use Scenario: Handheld multimeters and pH meters powered by single 1.5 V alkaline cells requiring stable reference despite declining battery voltage. IC Role / Device Role / Timing Role: 2-terminal shunt reference providing fixed 1.235 V for ADC full-scale calibration and analog front-end biasing. Use Value: Enables accurate measurements down to 1.3 V supply while consuming only ~15 μA quiescent current-extending battery life beyond shelf life. | Use Scenario: Programmable current sources for sensor excitation (e.g., RTDs, strain gauges) demanding <0.1% absolute accuracy over temperature. IC Role / Device Role / Timing Role: Precision voltage source feeding a matched resistor network to generate 1 μA–1 mA output currents. Use Value: 30 ppm/°C TC and 20 ppm/1000 hr stability ensure current accuracy remains within ±0.05% over 5 years of field use. |
| Micropower Thermocouple Compensation | Low-Voltage Regulator Reference |
Use Scenario: Cold-junction compensation circuits in industrial temperature transmitters operating from 3.3 V rails with strict power budgets. IC Role / Device Role / Timing Role: Shunt reference generating Kelvin-equivalent voltage (1.8 μV/K) for thermocouple cold-junction offset correction. Use Value: 10 μA minimum operating current allows integration into sub-50 μA total system sleep modes without wake-up latency. | Use Scenario: Feedback reference for adjustable LDOs or switching regulators targeting 1.8 V or 2.5 V outputs in wearables and hearing aids. IC Role / Device Role / Timing Role: Stable voltage setpoint for error amplifier feedback loop, replacing less-accurate internal band-gap references. Use Value: ±1% initial tolerance and 1 Ω dynamic impedance reduce output voltage error to <±10 mV even under 100 mA load steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BXMX-1.2/NOPB | Same SOIC-8 package, ±1% tolerance, but uses X-suffix trimming (30 ppm/°C TC) vs. B-suffix (same spec); identical electrical specs. | No functional difference; both rated for 0°C–70°C operation and share same pinout and marking (LM385BM1.2). | Select LM385BXMX-1.2/NOPB if traceability to X-suffix qualification testing is required for automotive ASIL-B systems. |
| LM385M3X-1.2/NOPB | SOT-23-3 package, same 1.235 V, ±1%, 30 ppm/°C, but lower max current (15 mA) and higher dynamic impedance (2 Ω). | Used where board area is constrained (1.3 mm × 2.9 mm vs. SOIC's 3.9 mm × 4.9 mm); not drop-in due to different pinout and thermal resistance (283°C/W vs. 165°C/W). | Choose LM385M3X-1.2/NOPB only when footprint reduction outweighs thermal and current-drive trade-offs in compact wearable designs. |
Compared with LM385BMX-1.2/NOPB, LM385BXMX-1.2/NOPB offers identical performance in the same SOIC-8 package, while LM385M3X-1.2/NOPB trades package size and thermal capability for board-area savings-requiring layout revision and derating for >10 mA loads.
Availability
LM385BMX-1.2/NOPB is available at Aetrix Electronics and suitable for portable battery-powered meters, precision current sources, and micropower thermocouple compensation requiring stable component supply across industrial and medical OEM programs.
Supply support for LM385BMX-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-accuracy voltage referencing in battery-critical and calibration-sensitive applications-including handheld test equipment, sensor interfaces, and portable medical devices.
FAQ
What is the operating temperature range for LM385BMX-1.2/NOPB?
The LM385BMX-1.2/NOPB is specified for operation from 0°C to +70°C ambient temperature. This industrial-grade range aligns with commercial and light-industrial applications where extended temperature coverage is not required. The device's 30 ppm/°C temperature coefficient ensures predictable drift behavior within this span, and its SOIC-8 package provides adequate thermal dissipation at typical operating currents below 10 mA. LM385BMX-1.2/NOPB does not support extended or military temperature grades.
Can LM385BMX-1.2/NOPB replace LM385-1.2-N in existing designs?
Yes, LM385BMX-1.2/NOPB is a direct replacement for the legacy LM385-1.2-N in SOIC-8 configurations, sharing identical electrical specifications (1.235 V, ±1%, 1 Ω Zdyn, 30 ppm/°C), pinout, and marking (LM385BM1.2). It retains RoHS compliance and green packaging, with no PCB layout changes required. LM385BMX-1.2/NOPB supersedes older non-NOPB variants and is actively manufactured-ensuring long-term supply continuity for LM385-1.2-N users upgrading to lead-free assembly.
What is the maximum reverse current rating for LM385BMX-1.2/NOPB?
The absolute maximum reverse current for LM385BMX-1.2/NOPB is 30 mA, as defined in the Absolute Maximum Ratings table. However, the recommended operating range is 10 μA to 20 mA per Electrical Characteristics. Exceeding 20 mA risks increased self-heating (>10°C rise at 20 mA in SOIC-8), degrading long-term stability and temperature coefficient performance. For reliable operation, maintain reverse current ≤20 mA and ensure adequate PCB copper pour for thermal management when operating near upper limit.
Does LM385BMX-1.2/NOPB require an external capacitor for stability?
LM385BMX-1.2/NOPB is exceptionally tolerant of capacitive loading and remains stable with output capacitance up to 100 nF without external series resistance. A 1 nF ceramic capacitor placed directly at the cathode (Pin 2) is recommended for high-frequency noise suppression and transient response improvement. Larger values (e.g., 100 nF) may be used for additional filtering in noisy environments, but are not mandatory for basic regulation stability-unlike many older references that demand strict ESR control.
How does the LM385BMX-1.2/NOPB achieve its low temperature coefficient?
LM385BMX-1.2/NOPB achieves its 30 ppm/°C temperature coefficient through on-chip laser trimming of resistor ratios in a band-gap reference core, compensating for the opposing thermal coefficients of base-emitter voltage (VBE) and thermal voltage (VT). This X-suffix trimming process is performed at multiple temperatures during final test, ensuring minimal deviation across 0°C–70°C. The result is a reference voltage that varies less than ±2.1 mV over the full operating range-critical for applications like digital calipers and portable DMMs where ambient temperature fluctuates.
LM385BMX-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:
- 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
LM385BMX-1.2/NOPB FAQ
1.How can I place an order for LM385BMX-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BMX-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 LM385BMX-1.2/NOPB reliable?
The price and inventory of LM385BMX-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 LM385BMX-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM385BMX-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BMX-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BMX-1.2/NOPB?
LM385BMX-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BMX-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 LM385BMX-1.2/NOPB?
For technical support, including LM385BMX-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BMX-1.2/NOPB requirements.
6.How does Aetrix verify that LM385BMX-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385BMX-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 LM385BMX-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM385BMX-1.2/NOPB?
All LM385BMX-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385BMX-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 LM385BMX-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM385BMX-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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