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Texas Instruments LM385BXM-2.5/NOPB
- Part No.:
- LM385BXM-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385BXM-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,390
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Product details
Overview
LM385BXM-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, 30 ppm/°C average temperature coefficient, and 0.6 Ω dynamic impedance. It operates over 20 μA–20 mA supply current and 0°C to 70°C ambient temperature, enabling use in portable meters, battery-powered sensors, and precision analog front-ends where low quiescent current and long-term stability are critical.
For engineers reviewing the LM385BXM-2.5/NOPB datasheet, LM385BXM-2.5/NOPB pinout, LM385BXM-2.5/NOPB application, or LM385BXM-2.5/NOPB equivalent, this page provides verified package mapping (SOIC-8), confirmed electrical specifications (including reverse breakdown voltage, min operating current, and dynamic impedance), thermal ratings, and real-world application context for embedded analog design and voltage reference selection.
Technical Context
The LM385BXM-2.5/NOPB uses a band-gap reference core with on-chip trimming to achieve tight initial voltage accuracy and low temperature drift. Its 2-terminal architecture simplifies integration into current-source or shunt-reference configurations without requiring external biasing components.
Designed for micropower operation, it maintains stable regulation across a 1000× current range (20 μA to 20 mA) while exhibiting exceptionally low dynamic impedance (0.6 Ω at 100 μA) and wideband noise of 120 μVrms (10 Hz–10 kHz), making it suitable for high-resolution ADC references and low-noise sensor signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.500 V ±20 mV (±0.8%) at 100 μA - ensures accurate system-level calibration without post-manufacture trimming. |
| Initial Tolerance | ±20 mV (Grade B) - tighter than standard LM385-2.5-N (±50 mV), reducing need for external gain adjustment. |
| Temp Coefficient | 30 ppm/°C (X suffix) - enables <1.5 mV drift over 0°C–70°C, critical for unheated industrial sensor nodes. |
| Dynamic Impedance | 0.6 Ω at 100 μA - minimizes load-induced voltage shift in varying-current applications like programmable current sources. |
| Operating Current | 20 μA to 20 mA - supports ultra-low-power sleep modes (e.g., 30 μA standby in Figure 16) and full-scale analog circuitry. |
| Long-Term Stability | 20 ppm (1000 hr @ 25°C) - ensures reference integrity over product lifetime without recalibration. |
| Noise (10 Hz–10 kHz) | 120 μVrms - compatible with 16-bit+ ADCs when used as reference or bias source. |
Pinout & Package
LM385BXM-2.5/NOPB is housed in an 8-pin SOIC package (Package Drawing D0008A, 3.91 mm × 4.90 mm × 1.75 mm max height) with industry-standard lead pitch (1.27 mm). The device uses a 2-terminal configuration: Pin 1 (Anode) and Pin 8 (Cathode) form the primary reference terminals; all other pins are internally connected or unused.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Main current entry point; connects to regulated output node or current-sink load. |
| Pin 8 | Cathode | Main current exit point; ties to ground or negative rail in shunt-reference topology. |
| Pins 2–7 | No Connect (NC) | Internally unconnected; must remain floating per TI datasheet guidance to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with >10 μF output capacitance - eliminates need for isolation resistors in noisy environments. |
| Micropower Operation | 20 μA minimum operating current - extends battery life in portable instrumentation to near shelf-life duration. |
| Low Dynamic Impedance | 0.6 Ω at 100 μA - maintains voltage accuracy under dynamic load transients common in multiplexed sensor systems. |
| Hermetic Alternative Available | LM185H-2.5/NOPB variant rated −55°C to +125°C - provides drop-in upgrade path for extended-temperature designs. |
| RoHS/Green Compliant | Sn finish, Level-1 MSL rating - supports lead-free reflow assembly without moisture sensitivity concerns. |
Applications
| Portable Digital Multimeters | Industrial Temperature Sensors |
|---|---|
|
Use Scenario: Battery-powered handheld DMM requiring stable 2.5 V reference for 3½-digit ADC conversion over 0–70°C. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation and scaling for analog front-end and ADC reference input. Use Value: 30 μA typical standby current (Figure 16) enables >1-year battery life; ±20 mV tolerance eliminates factory calibration step. |
Use Scenario: RTD or thermistor-based temperature transmitter in factory automation, operating unheated in ambient 0–70°C range. IC Role / Device Role / Timing Role: Precision bias source for Wheatstone bridge and reference for ratiometric ADC measurement. Use Value: 30 ppm/°C tempco limits error to <1.5 mV over full range; low noise preserves 12-bit effective resolution. |
| Low-Power Data Loggers | Calibration Equipment |
|
Use Scenario: Remote environmental monitor logging voltage, temperature, and humidity using coin-cell battery (CR2032). IC Role / Device Role / Timing Role: Micropower reference for sensor signal conditioning and ADC reference in intermittent-sampling architecture. Use Value: 20 μA minimum operating current allows continuous reference bias during deep-sleep states; 20 ppm long-term stability avoids field recalibration. |
Use Scenario: Benchtop calibrator generating precision 2.5 V outputs for testing analog I/O modules in PLC systems. IC Role / Device Role / Timing Role: Primary voltage standard in closed-loop feedback circuit with op-amp buffer and trim resistor network. Use Value: On-chip trimmed ±20 mV tolerance reduces calibration time by >40% vs. untrimmed references; TO-92 variants (e.g., LM385BXZ-2.5/NOPB) support socketed test fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BXZ-2.5/NOPB | Same electrical specs (Grade B, X suffix), but TO-92 package (3-pin, through-hole) with different thermal resistance (θJA = 440°C/W vs. 165°C/W for SOIC). | Preferred for prototyping, manual assembly, or legacy PCBs requiring axial-leaded components. | Select when mechanical mounting, hand-soldering, or socket compatibility is required; not drop-in electrically due to different pinout and thermal behavior. |
| LM385M-2.5/NOPB | Standard Grade (±50 mV initial tolerance, 150 ppm/°C tempco), otherwise identical SOIC-8 footprint and operating range. | Suitable for cost-sensitive applications where ±0.8% accuracy is sufficient (e.g., non-critical power monitoring). | Choose for BOM cost reduction where tighter tolerance and lower drift are not required; shares same layout and reflow profile. |
Compared with LM385BXZ-2.5/NOPB and LM385M-2.5/NOPB, the LM385BXM-2.5/NOPB delivers superior accuracy and thermal stability in surface-mount production environments, while maintaining full compatibility with automated assembly processes and existing SOIC-8 land patterns.
Availability
LM385BXM-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor nodes, and battery-powered data loggers requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for LM385BXM-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 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 portable, battery-constrained, and industrial-grade analog systems - emphasizing long-term stability, low noise, and wide operating current range.
FAQ
What is the operating temperature range for LM385BXM-2.5/NOPB?
The LM385BXM-2.5/NOPB is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade range aligns with its SOIC packaging and target applications in consumer and industrial electronics where extended temperature capability is not required. For wider ranges, consider LM285BXM-2.5/NOPB (−40°C to +85°C) or LM185H-2.5/NOPB (−55°C to +125°C).
Can LM385BXM-2.5/NOPB be used as a series voltage reference?
No - the LM385BXM-2.5/NOPB is a 2-terminal shunt voltage reference, not a 3-terminal series reference. It must be connected in parallel with the load and biased with an external current source. Attempting series-mode connection will prevent proper regulation and may damage the device. Refer to Figure 15 and Figure 16 in the TI datasheet for correct shunt topology implementation.
What is the minimum supply current required for LM385BXM-2.5/NOPB to regulate properly?
The LM385BXM-2.5/NOPB requires a minimum operating current of 20 μA to maintain regulation within specification. Below this threshold, output voltage deviates significantly from 2.5 V. Designers must ensure the bias network delivers ≥20 μA across the full operating temperature and load range, especially in low-power sleep modes.
Is LM385BXM-2.5/NOPB pin-compatible with other LM385 variants in SOIC-8?
Yes - all LM385-x variants in SOIC-8 (e.g., LM385M-2.5/NOPB, LM385BYM-2.5/NOPB) share identical pinout: Pin 1 = Anode, Pin 8 = Cathode, Pins 2–7 = NC. However, electrical differences (tolerance, tempco, dynamic impedance) mean direct substitution affects system accuracy and thermal performance; verify spec alignment before replacement.
Does LM385BXM-2.5/NOPB require an output capacitor for stability?
No external capacitor is required for stability - the LM385BXM-2.5/NOPB is explicitly designed to be tolerant of capacitive loading up to at least 10 μF, as stated in the datasheet. Adding a capacitor (e.g., 0.1 μF ceramic) is optional and recommended only to reduce high-frequency noise in sensitive analog circuits, not for loop stability.
LM385BXM-2.5/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):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1.5%
- Temperature Coefficient:
- 30ppm/°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
LM385BXM-2.5/NOPB FAQ
1.How can I place an order for LM385BXM-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BXM-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 LM385BXM-2.5/NOPB reliable?
The price and inventory of LM385BXM-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 LM385BXM-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM385BXM-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BXM-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BXM-2.5/NOPB?
LM385BXM-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BXM-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 LM385BXM-2.5/NOPB?
For technical support, including LM385BXM-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BXM-2.5/NOPB requirements.
6.How does Aetrix verify that LM385BXM-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385BXM-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 LM385BXM-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM385BXM-2.5/NOPB?
All LM385BXM-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385BXM-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 LM385BXM-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM385BXM-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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