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Texas Instruments LM385BYM-2.5/NOPB
- Part No.:
- LM385BYM-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385BYM-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,627
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Product details
Overview
LM385BYM-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 (Grade Y), 50 ppm/°C average temperature coefficient, 0.6 Ω dynamic impedance at 100 μA, and operation across 20 μA–20 mA supply current - used in portable meters, battery-powered sensor interfaces, and precision ADC/DAC biasing.
For engineers reviewing the LM385BYM-2.5/NOPB datasheet, LM385BYM-2.5/NOPB pinout, LM385BYM-2.5/NOPB application, or LM385BYM-2.5/NOPB equivalent, key selection factors include its SOIC-8 package, 0°C to 70°C operating range, low-noise 120 μVrms (10 Hz–10 kHz), and compatibility with micropower current sources and thermocouple cold-junction compensation circuits.
Technical Context
The LM385BYM-2.5/NOPB uses a band-gap core with on-chip trimming for tight voltage accuracy and achieves stable regulation over a 20 μA–20 mA current range without external capacitors. Its design eliminates need for series pass elements or feedback loops, functioning as a 2-terminal shunt reference.
It exhibits exceptionally low dynamic impedance (0.6 Ω at 100 μA) and wideband noise of 120 μVrms, enabling high-resolution analog signal conditioning in space-constrained, low-power systems where long-term stability (20 ppm/1000 hr) and thermal drift control are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±20 mV (±0.8%) - ensures accurate scaling for 12-bit+ ADCs and precision DACs without calibration. |
| Temperature Coefficient | 50 ppm/°C (Grade Y) - limits voltage drift to ±1.75 mV over 0°C–70°C ambient, supporting stable sensor excitation. |
| Dynamic Impedance | 0.6 Ω at 100 μA - maintains regulation under fast load transients in battery-operated instrumentation. |
| Operating Current Range | 20 μA to 20 mA - supports ultra-low-power sleep modes and higher-drive applications like op-amp biasing. |
| Wideband Noise | 120 μVrms (10 Hz–10 kHz) - minimizes added noise in precision measurement front-ends. |
| Long-Term Stability | 20 ppm (1000 hr @ 25°C) - reduces recalibration frequency in field-deployed monitoring equipment. |
Pinout & Package
LM385BYM-2.5/NOPB is housed in an 8-pin SOIC package (Package Drawing D0008A), 1.75 mm max height, RoHS-compliant, with lead finish SN (matte tin). Pin 1 is marked by a notch or beveled corner; pins 1–4 and 5–8 are on opposing sides.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Cathode Input) | Connected to system ground or negative rail; reverse-biased terminal accepting current into device. |
| Pin 2 | Cathode (Output) | Provides regulated 2.5 V reference voltage; must be decoupled with ≥10 nF capacitor if driving noisy loads. |
| Pins 3–8 | No Connect / Thermal Pad | Internally unconnected; left floating per TI recommendation - no electrical function or thermal path required. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 20 μA minimum operating current enables >10-year battery life in portable multimeters and IoT sensors. |
| Capacitive Load Tolerance | Stable with unlimited capacitive loading - eliminates need for isolation resistors in ADC reference buffers. |
| Low Dynamic Impedance | 0.6 Ω at 100 μA ensures <1 mV droop during 1 mA step load changes in precision current sources. |
| Hermetic Stability | Band-gap-only architecture (no MOS gates) delivers superior long-term drift vs. CMOS references. |
| Wide Supply Flexibility | Operates from 2.7 V to 36 V input via series resistor - simplifies design across 3.3 V, 5 V, and 12 V systems. |
Applications
| Portable Digital Multimeter | Thermocouple Cold-Junction Compensation |
|---|---|
Use Scenario: Handheld DMM requiring stable 2.5 V reference for 16-bit sigma-delta ADC over 0°C–50°C ambient. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation and scaling for analog front-end and ADC reference input. Use Value: 50 ppm/°C TC and 20 ppm/1000 hr stability eliminate field recalibration; 20 μA quiescent current extends alkaline battery life to >5 years. |
Use Scenario: Industrial temperature transmitter using Type K thermocouple with automatic cold-junction compensation. IC Role / Device Role / Timing Role: Precision 2.5 V source for generating proportional Kelvin-scale current (1 μA/°K) in compensation circuitry. Use Value: Low noise (120 μVrms) prevents thermocouple signal corruption; SOIC-8 allows compact layout near sensor interface ICs. |
| Low-Power Data Acquisition Node | Calibration Equipment Reference |
Use Scenario: Battery-powered environmental sensor node measuring pH, conductivity, and dissolved oxygen with 12-bit resolution. IC Role / Device Role / Timing Role: Primary voltage reference for multiplexed analog signal chain including programmable gain amplifier and SAR ADC. Use Value: 0.6 Ω dynamic impedance rejects supply ripple; 20–20 mA operating range accommodates variable channel count and sampling rate. |
Use Scenario: Benchtop calibrator requiring traceable 2.5 V output with <±0.01% uncertainty over 24-hour period. IC Role / Device Role / Timing Role: Stable shunt reference in precision current-source topology generating calibrated test voltages. Use Value: ±20 mV initial tolerance and 20 ppm long-term drift meet ISO/IEC 17025 verification requirements without active trimming. |
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 | Grade X (30 ppm/°C TC, tighter 15 mV initial tolerance) in identical SOIC-8 package | Better thermal stability for lab-grade instruments; same pinout and footprint | Select when <30 ppm/°C drift is mandatory and budget permits tighter spec |
| REF3025AIDBZR | 3.0 V fixed output, 50 ppm/°C TC, 50 μA min current, SOT-23-3 package | Smaller footprint but different voltage; requires redesign of bias network and decoupling | Choose only if board space is constrained and 3.0 V reference suffices for system architecture |
Compared with LM385BXM-2.5/NOPB, LM385BYM-2.5/NOPB trades 20 ppm/°C higher temperature coefficient for broader availability and lower cost; versus REF3025AIDBZR, it retains 2.5 V compatibility and SOIC-8 thermal mass but occupies more PCB area.
Availability
LM385BYM-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor nodes, calibration equipment, and battery-powered data loggers requiring stable component supply with full traceability and lifecycle continuity.
Supply support for LM385BYM-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 over 90 years of innovation in precision analog ICs.
The LM385 family was designed specifically for micropower, high-stability shunt voltage reference applications in portable, battery-critical, and industrial measurement systems - emphasizing low drift, wide current range, and robustness against capacitive loading.
FAQ
What is the operating temperature range for LM385BYM-2.5/NOPB?
The LM385BYM-2.5/NOPB is rated for operation from 0°C to 70°C ambient temperature. This commercial-grade range aligns with standard industrial and consumer electronics environments. It is distinct from the LM285BYM-2.5/NOPB (−40°C to +85°C) and LM185H-2.5/NOPB (−55°C to +125°C), and thermal derating is not required within this specified range.
Does LM385BYM-2.5/NOPB require an external capacitor for stability?
No, the LM385BYM-2.5/NOPB does not require an external capacitor for stability. Its internal band-gap design is inherently tolerant of capacitive loading, including direct connection to large bypass capacitors (>1 μF). However, a 10 nF ceramic capacitor is recommended at the cathode (Pin 2) to suppress high-frequency noise in sensitive measurement circuits.
What is the meaning of the 'Y' suffix in LM385BYM-2.5/NOPB?
The 'Y' suffix in LM385BYM-2.5/NOPB denotes Grade Y performance: ±20 mV (±0.8%) initial tolerance and 50 ppm/°C average temperature coefficient. This grade balances cost and precision for general-purpose applications, differing from Grade X (30 ppm/°C) and Grade B (150 ppm/°C) variants within the same LM385-2.5 family.
Can LM385BYM-2.5/NOPB be used as a 2.5 V series reference?
No, LM385BYM-2.5/NOPB is a 2-terminal shunt reference and cannot function as a series (3-terminal) reference. It regulates by sinking current through its anode (Pin 1) to ground while maintaining 2.5 V at its cathode (Pin 2). To emulate series behavior, it must be used with an external series resistor and op-amp buffer - not a drop-in replacement for ICs like TL431.
Is LM385BYM-2.5/NOPB pin-compatible with other LM385-2.5 variants in SOIC-8?
Yes, all LM385-2.5 variants in SOIC-8 package (e.g., LM385BM-2.5/NOPB, LM385BXM-2.5/NOPB, LM385M-2.5/NOPB) share identical pinout: Pin 1 = Anode, Pin 2 = Cathode, Pins 3–8 = NC. The LM385BYM-2.5/NOPB may be substituted on the same PCB footprint without layout changes, provided thermal and application requirements (e.g., TC, tolerance) are verified.
LM385BYM-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:
- 50ppm/°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
LM385BYM-2.5/NOPB FAQ
1.How can I place an order for LM385BYM-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BYM-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 LM385BYM-2.5/NOPB reliable?
The price and inventory of LM385BYM-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 LM385BYM-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM385BYM-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BYM-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BYM-2.5/NOPB?
LM385BYM-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BYM-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 LM385BYM-2.5/NOPB?
For technical support, including LM385BYM-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BYM-2.5/NOPB requirements.
6.How does Aetrix verify that LM385BYM-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385BYM-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 LM385BYM-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM385BYM-2.5/NOPB?
All LM385BYM-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385BYM-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 LM385BYM-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM385BYM-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM385BYM-2.5/NOPB Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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