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Texas Instruments LM385BYMX-2.5/NOPB
- Part No.:
- LM385BYMX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385BYMX-2.5/NOPB.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,521
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Product details
Overview
LM385BYMX-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 (Y-grade), 50 ppm/°C max temperature coefficient, and operation from 20 μA to 20 mA supply current. It serves as a stable reference in portable meters, battery-powered analog circuits, and precision current sources where low quiescent current and wide dynamic range are critical.
For engineers reviewing the LM385BYMX-2.5/NOPB datasheet, LM385BYMX-2.5/NOPB pinout, LM385BYMX-2.5/NOPB application, or LM385BYMX-2.5/NOPB equivalent, key selection criteria include its SOIC-8 package, 0°C to 70°C operating temperature range, 0.6 Ω dynamic impedance, low-noise performance (120 μV rms, 10 Hz–10 kHz), and compatibility with capacitive loads up to 10 μF without instability.
Technical Context
The LM385BYMX-2.5/NOPB uses a band-gap core with on-chip trimming for tight initial accuracy and achieves stable regulation across a 1000× current range (20 μA–20 mA). Its two-terminal architecture simplifies design by eliminating separate input/output pins-current flows through the device to develop the reference voltage across it.
Designed for micropower systems, it features exceptionally low dynamic impedance (0.6 Ω at 100 μA) and low wideband noise (120 μV rms), enabling high-precision ADC/DAC biasing and stable current-source generation without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V ±20 mV (±0.8%) - ensures accurate scaling in 12-bit+ data converters and calibrated sensor interfaces |
| Initial Tolerance | ±20 mV (Y-grade) - eliminates need for post-manufacture trimming in cost-sensitive instrumentation |
| Temp Coefficient | 50 ppm/°C max - supports stable operation across commercial temperature range without thermal drift compensation |
| Operating Current | 20 μA to 20 mA - enables use in ultra-low-power standby modes and higher-current precision references |
| Dynamic Impedance | 0.6 Ω at 100 μA - maintains voltage stability under fast load transients in regulated power supplies |
| Wideband Noise | 120 μV rms (10 Hz–10 kHz) - minimizes added error in high-resolution measurement front-ends |
| Long-Term Stability | 20 ppm (1000 hr) - ensures calibration integrity over product lifetime in medical and test equipment |
Pinout & Package
LM385BYMX-2.5/NOPB is housed in an 8-pin SOIC package (Package Drawing D0008A) with 1.27 mm lead pitch, 3.9 mm width, and 1.75 mm max height. Pin 1 is marked by a notch or beveled corner; pins 1–4 are on one side, 5–8 on the opposite.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Input) | Current entry terminal; connects to unregulated supply or current source |
| Pin 2 | Cathode (Output) | Reference voltage node; voltage appears between Pins 1 and 2 |
| Pins 3–8 | No Connect / Thermal Pad | Internally isolated; must be left floating or tied to Pin 2 for thermal enhancement per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥10 μF output capacitance - eliminates need for series resistance or external compensation |
| Micropower Operation | 20 μA minimum operating current - extends battery life in portable multimeters and IoT sensors |
| Low Dynamic Impedance | 0.6 Ω at 100 μA - delivers <1 mV droop during 1 mA load steps, critical for precision DAC buffers |
| Hermetic Alternative Available | LM385BYM-2.5/NOPB in same SOIC package - offers identical specs with tube packaging for prototyping |
| RoHS/Green Compliant | Sn finish, Level-1 MSL rating - supports lead-free reflow assembly without moisture sensitivity concerns |
Applications
| Portable Digital Multimeter | Precision Current Source |
|---|---|
Use Scenario: Battery-powered handheld DMM requiring stable 2.5 V reference for 16-bit ADC conversion across 0–70°C ambient. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing excitation voltage for internal voltage divider and ADC reference rail. Use Value: 50 ppm/°C tempco and 20 μA min current enable >1-year shelf-life battery operation while maintaining ±0.1% full-scale accuracy. | Use Scenario: Programmable 1–100 μA current source for sensor biasing in environmental monitoring nodes. IC Role / Device Role / Timing Role: Precision voltage reference setting current through external RSET resistor in op-amp-based Howland source. Use Value: 0.6 Ω dynamic impedance ensures <0.05% current error under 100 kHz step loads, improving sensor signal fidelity. |
| Calibrated Thermometer | Micropower Data Logger |
Use Scenario: Handheld thermometer with thermistor bridge and 12-bit SAR ADC, calibrated at 0°C and 100°C points. IC Role / Device Role / Timing Role: Reference for ratiometric bridge excitation and ADC reference to cancel supply variation effects. Use Value: ±20 mV initial tolerance and 20 ppm long-term stability eliminate field recalibration for 2-year service intervals. | Use Scenario: Remote soil moisture logger powered by coin cell, sampling every 15 minutes with 10-bit ADC. IC Role / Device Role / Timing Role: Low-quiescent reference enabling system sleep current <1 μA while retaining 2.5 V reference readiness. Use Value: 20 μA min operating current allows direct connection to LDO output, reducing BOM count vs. discrete Zener solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BXMX-2.5/NOPB | Tighter ±10 mV (±0.4%) initial tolerance (X-grade); same SOIC-8 package and 0°C–70°C range | Better suited for 14-bit+ data acquisition where initial accuracy dominates total error budget | Select when absolute initial accuracy is prioritized over cost; no PCB changes required |
| LM385BMX-2.5/NOPB | Looser ±50 mV (±2.0%) initial tolerance (B-grade); otherwise identical electrical specs and package | Targeted at cost-sensitive industrial controls where calibration compensates for initial offset | Select for high-volume production where post-calibration is standard practice |
Compared with LM385BXMX-2.5/NOPB, the LM385BYMX-2.5/NOPB trades 10 mV initial accuracy for broader availability and lower unit cost, while LM385BMX-2.5/NOPB further reduces cost at the expense of guaranteed initial tolerance-making the BY-grade optimal for mid-accuracy, high-reliability commercial instrumentation.
Availability
LM385BYMX-2.5/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, precision sensor interfaces, and battery-powered data loggers requiring stable component supply with consistent SOIC-8 packaging and RoHS compliance.
Supply support for LM385BYMX-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 analog ICs.
The LM385 family was designed specifically for micropower, high-stability voltage reference applications in portable, battery-operated, and space-constrained systems where low quiescent current and robust capacitive-load immunity are essential.
FAQ
What is the operating temperature range for LM385BYMX-2.5/NOPB?
The LM385BYMX-2.5/NOPB is rated for operation from 0°C to 70°C, matching the commercial temperature grade of the LM385 series. This range is confirmed in TI's SNVS743D datasheet and applies specifically to all LM385 variants including the BY-grade in SOIC packaging. It is not rated for extended industrial or automotive ranges.
Does LM385BYMX-2.5/NOPB require external capacitors for stability?
No, the LM385BYMX-2.5/NOPB is explicitly designed to be stable with capacitive loads up to 10 μF without external series resistance or compensation components. This capability is documented in the "Features" section of the TI datasheet and verified across the full 20 μA–20 mA operating current range, making it ideal for noisy or high-capacitance PCB environments.
What is the maximum reverse current rating for LM385BYMX-2.5/NOPB?
The absolute maximum reverse current for LM385BYMX-2.5/NOPB is 30 mA, as specified in the Absolute Maximum Ratings table of the TI SNVS743D datasheet. Exceeding this value risks permanent damage. For reliable operation, the recommended reverse current remains within the 20 μA to 20 mA functional range defined in the Electrical Characteristics.
How does the LM385BYMX-2.5/NOPB differ from the LM385BXM-2.5/NOPB?
The LM385BYMX-2.5/NOPB and LM385BXM-2.5/NOPB share identical SOIC-8 packaging, 0°C–70°C temperature range, and electrical specifications except for initial tolerance: BY-grade is ±20 mV (±0.8%), while BX-grade is ±10 mV (±0.4%). Both are active TI parts with identical tape-and-reel packaging (2500-unit reels) and RoHS compliance.
Can LM385BYMX-2.5/NOPB be used in place of LM285BYMX-2.5/NOPB?
No-LM385BYMX-2.5/NOPB and LM285BYMX-2.5/NOPB have different temperature ranges (0°C–70°C vs. −40°C–85°C) and are not interchangeable without system-level validation. While both are 2.5 V Y-grade references in SOIC-8, the LM285 variant is qualified for extended industrial operation and has distinct thermal characteristics and reliability testing. Substitution requires redesign verification.
LM385BYMX-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:
- 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
LM385BYMX-2.5/NOPB FAQ
1.How can I place an order for LM385BYMX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BYMX-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 LM385BYMX-2.5/NOPB reliable?
The price and inventory of LM385BYMX-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 LM385BYMX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM385BYMX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BYMX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BYMX-2.5/NOPB?
LM385BYMX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BYMX-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 LM385BYMX-2.5/NOPB?
For technical support, including LM385BYMX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BYMX-2.5/NOPB requirements.
6.How does Aetrix verify that LM385BYMX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385BYMX-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 LM385BYMX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM385BYMX-2.5/NOPB?
All LM385BYMX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385BYMX-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 LM385BYMX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LM385BYMX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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