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Texas Instruments LM385BMX-2.5/NOPB
- Part No.:
- LM385BMX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385BMX-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,458
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Product details
Overview
LM385BMX-2.5/NOPB from Texas Instruments is a micropower 2-terminal band-gap voltage reference delivering a precise 2.5 V output with ±20 mV (±0.8%) initial tolerance, 0.6 Ω dynamic impedance, and 30 ppm/°C average temperature coefficient over 0°C to 70°C. It operates across 20 μA–20 mA supply current and supports portable meters, battery-powered analog circuitry, and precision current sources.
For engineers reviewing the LM385BMX-2.5/NOPB datasheet, LM385BMX-2.5/NOPB pinout, LM385BMX-2.5/NOPB application, or LM385BMX-2.5/NOPB equivalent, key selection criteria include its SOIC-8 package, low-noise 120 μVrms wideband noise, tight thermal stability, and compatibility with micropower systems requiring long battery life and minimal drift.
Technical Context
The LM385BMX-2.5/NOPB uses band-gap reference architecture with on-chip trimming for voltage accuracy and relies solely on transistors and resistors-enabling low noise and excellent long-term stability. Its design eliminates external compensation needs due to exceptional tolerance of capacitive loading.
It functions as a 2-terminal shunt reference, sinking current rather than sourcing it, and maintains regulation across a wide dynamic operating range without requiring minimum load current beyond its own 20 μA operating threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V ±20 mV (±0.8%) at 25°C; ensures accurate ADC/DAC biasing and sensor excitation in commercial-temperature systems. |
| Operating Current Range | 20 μA to 20 mA; enables use in ultra-low-power standby modes and higher-current precision references without redesign. |
| Dynamic Impedance | 0.6 Ω at 100 μA and 20 Hz; minimizes output voltage perturbation under varying load conditions. |
| Temperature Coefficient | 30 ppm/°C (X suffix); guarantees ≤0.75 mV total drift over full 0°C–70°C range for stable calibration. |
| Wideband Noise | 120 μVrms, 10 Hz–10 kHz; preserves signal integrity in high-resolution measurement front-ends. |
| Long-Term Stability | 20 ppm after 1000 hours; supports applications requiring infrequent recalibration, such as field instrumentation. |
Pinout & Package
LM385BMX-2.5/NOPB is housed in an 8-pin SOIC package (Package Drawing D0008A) with 1.75 mm maximum height, RoHS-compliant matte tin lead finish, and JEDEC MS-012 AA compliance. Pin 1 is located at the top-left corner adjacent to the index area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Input) | Connects to regulated output node; reverse-biased terminal where current enters the device. |
| Pin 2 | Cathode (Output/Ground) | Reference voltage node; connects to system ground or feedback point in shunt regulator configurations. |
| Pins 3–8 | No Connect (NC) | Internally unconnected; must remain floating per TI specification to avoid performance degradation. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with unlimited capacitive loading-eliminates need for series isolation resistor in battery-monitoring circuits. |
| Micropower Operation | 20 μA minimum operating current enables multi-year operation from coin cells in portable data loggers. |
| Low Dynamic Impedance | 0.6 Ω ensures <1 mV output shift under 1 mA load transients-critical for precision current-source designs. |
| Tight Initial Tolerance | ±20 mV (±0.8%) reduces or eliminates post-production trimming in production test flows. |
| Hermetic Stability | Band-gap-only topology (no junctions or MOS gates) delivers superior long-term drift vs. Zener-based references. |
Applications
| Portable Digital Multimeters | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Battery-powered handheld DMM measuring DC voltage with 4½-digit resolution. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.5 V reference for the internal 24-bit sigma-delta ADC. Use Value: Enables ±0.02% basic DCV accuracy with no warm-up time and <30 μA quiescent current draw. | Use Scenario: 4–20 mA loop-powered pressure transmitter with onboard analog front-end. IC Role / Device Role / Timing Role: Precision excitation source for bridge sensors and reference for ratiometric ADC conversion. Use Value: Maintains <0.1% span error over temperature due to 30 ppm/°C TC and low noise. |
| Calibration Equipment | Medical Thermometer Front-End |
Use Scenario: Benchtop calibrator generating traceable 2.5 V outputs for field instrument verification. IC Role / Device Role / Timing Role: Primary voltage standard in programmable reference subsystem with laser-trimmed resistor network. Use Value: Delivers 20 ppm/year long-term stability-meeting ISO/IEC 17025 calibration lab requirements. | Use Scenario: Clinical-grade digital thermometer using thermistor or RTD sensing element. IC Role / Device Role / Timing Role: Low-noise reference for high-gain, low-drift instrumentation amplifier driving 24-bit ADC. Use Value: 120 μVrms noise floor supports <0.01°C temperature resolution in 0°C–50°C range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BXM-2.5/NOPB | Same SOIC-8 package and 0°C–70°C rating, but marked "385BX M2.5"; tighter 15 mV initial tolerance (±0.6%) and 20 ppm/°C TC. | Suitable for higher-accuracy applications where cost premium is acceptable for improved TC and tolerance. | Select when system-level accuracy budget requires <0.5% total error over temperature and time. |
| REF3025AIDBZR | 2.5 V, 50 ppm/°C max TC, 10 μA typical IQ, SOT-23-3 package; lower power but higher TC and no X-suffix grade option. | Better for space-constrained, ultra-low-power designs where 0.1% absolute accuracy suffices. | Choose for wearable or IoT nodes where PCB area and standby current are primary constraints. |
Compared with LM385BXM-2.5/NOPB, LM385BMX-2.5/NOPB trades 15 mV tolerance and 20 ppm/°C TC for broader availability and lower unit cost; versus REF3025AIDBZR, it offers superior thermal stability and proven long-term drift but occupies more board area and draws slightly more quiescent current.
Availability
LM385BMX-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, and calibration equipment requiring stable component supply, consistent parametric performance, and long-lifecycle support.
Supply support for LM385BMX-2.5/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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.
The LM385 family was designed specifically for micropower, high-stability shunt voltage reference applications in commercial-temperature environments-emphasizing low drift, low noise, and ease of use in battery-operated systems.
FAQ
What is the operating temperature range for LM385BMX-2.5/NOPB?
The LM385BMX-2.5/NOPB is rated for operation from 0°C to 70°C ambient temperature. This commercial-grade range aligns with its intended use in non-military, non-automotive applications such as portable test equipment and consumer-grade instrumentation where extended temperature coverage is not required. The device's 30 ppm/°C temperature coefficient is specified across this full range.
Does LM385BMX-2.5/NOPB require an external capacitor for stability?
No, LM385BMX-2.5/NOPB does not require an external capacitor for stability. Its internal design provides exceptional tolerance to capacitive loading-making it stable even with large output capacitance (e.g., 10 µF ceramic) commonly used for noise filtering in precision analog circuits. This eliminates the need for series isolation resistors or careful layout constraints associated with many shunt references.
What is the minimum cathode current needed for LM385BMX-2.5/NOPB to regulate properly?
The LM385BMX-2.5/NOPB requires a minimum cathode current of 20 μA to maintain regulation within specifications. Below this threshold, output voltage may deviate outside the guaranteed ±20 mV tolerance band. In practice, designs should ensure ≥25 μA total sink current-including load and any parallel leakage-to guarantee performance across process and temperature extremes.
Can LM385BMX-2.5/NOPB be used in series with other references to generate higher voltages?
No, LM385BMX-2.5/NOPB is a 2-terminal shunt reference and cannot be stacked in series to generate higher reference voltages. It must be connected between a current source and ground (or virtual ground), sinking current to develop its 2.5 V drop. For higher reference voltages, use dedicated series references like REF5025 or cascade with precision op-amps-not direct series connection of multiple LM385BMX-2.5/NOPB units.
Is LM385BMX-2.5/NOPB pin-compatible with LM385M-2.5/NOPB?
Yes, LM385BMX-2.5/NOPB and LM385M-2.5/NOPB share identical SOIC-8 (D) packaging, pinout, and terminal configuration-both have Pins 1 and 2 as anode and cathode, with Pins 3–8 as no-connect. However, they differ in grade: LM385BMX-2.5/NOPB is the B-grade (±20 mV, 30 ppm/°C), while LM385M-2.5/NOPB is the standard grade (±50 mV, 150 ppm/°C). Electrical substitution is possible but degrades accuracy.
LM385BMX-2.5/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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1.5%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 120µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 20 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM385BMX-2.5/NOPB FAQ
1.How can I place an order for LM385BMX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BMX-2.5/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-2.5/NOPB reliable?
The price and inventory of LM385BMX-2.5/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-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM385BMX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BMX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BMX-2.5/NOPB?
LM385BMX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BMX-2.5/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-2.5/NOPB?
For technical support, including LM385BMX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BMX-2.5/NOPB requirements.
6.How does Aetrix verify that LM385BMX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385BMX-2.5/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-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM385BMX-2.5/NOPB?
All LM385BMX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385BMX-2.5/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-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM385BMX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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