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Texas Instruments LM385BZ-2.5/LFT7
- Part No.:
- LM385BZ-2.5/LFT7
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM385BZ-2.5/LFT7.pdf
- Description:
- IC VREF SHUNT 1.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,583
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Product details
Overview
LM385BZ-2.5/LFT7 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 (A grade), and operation over 20 μA–20 mA current range. It serves as a stable reference in portable meters, battery-powered analog circuits, and precision current sources where low quiescent current and temperature stability are critical.
For engineers reviewing the LM385BZ-2.5/LFT7 datasheet, LM385BZ-2.5/LFT7 pinout, LM385BZ-2.5/LFT7 application, or LM385BZ-2.5/LFT7 equivalent, key selection criteria include its TO-92 package, 0°C to 70°C operating temperature range, ±20 mV initial accuracy, low 20 μA minimum operating current, and compatibility with capacitive loads up to 10 μF without instability.
Technical Context
The LM385BZ-2.5/LFT7 implements a two-terminal band-gap reference architecture using on-chip trimmed resistors and transistors to achieve tight voltage tolerance and low long-term drift. Its design eliminates the need for external biasing components and supports direct connection in series with load or current-setting resistor.
It features exceptionally low dynamic impedance (0.6 Ω at 100 μA, 20 Hz) and wideband noise of 120 μVrms (10 Hz–10 kHz), enabling high-accuracy ADC/DAC reference and precision current-source applications. Temperature coefficient is rated at 150 ppm/°C (standard grade), with tested limits confirmed across 0°C to 70°C.
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-production trimming |
| Initial Tolerance | ±20 mV (±0.8%) - meets A-grade spec for high-accuracy analog signal chains |
| Operating Current Range | 20 μA to 20 mA - supports ultra-low-power standby (e.g., 30 μA meter standby) and higher-drive reference buffering |
| Dynamic Impedance | 0.6 Ω at 100 μA, 20 Hz - minimizes output voltage shift under varying load current |
| Temperature Coefficient | 150 ppm/°C max - guarantees ≤3.75 mV total drift over full 0°C–70°C operating range |
| Long-Term Stability | 20 ppm (1000 hr @ 25°C) - enables reliable performance in field-deployed instrumentation |
| Wideband Noise | 120 μVrms, 10 Hz–10 kHz - suitable for 12-bit+ precision data converters without additional filtering |
Pinout & Package
LM385BZ-2.5/LFT7 is supplied in a 3-pin TO-92 plastic package (Package Drawing LP0003A), with leads formed for tape-and-reel automated assembly. The device is a 2-terminal device: Pin 1 is Cathode, Pin 2 is Anode, and Pin 3 is internally connected to the die attach pad and may be left floating or tied to Pin 2 per TI recommendation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode | Reference output node; connects to regulated 2.5 V point in circuit |
| Pin 2 | Anode | Current input terminal; ties to supply or current-setting resistor |
| Pin 3 | Die Attach Pad (DAP) | Internally bonded to substrate; electrically isolated - connect to Pin 2 or leave floating per datasheet guidance |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥10 μF output capacitance - eliminates need for isolation resistor in battery-powered systems |
| Micropower Operation | 20 μA minimum operating current - extends shelf-life-equivalent battery life in portable instruments |
| Low Dynamic Impedance | 0.6 Ω at 100 μA - maintains regulation during fast current transients in sensor front-ends |
| Hermetic Alternative Available | LM185-2.5-N offers same electrical specs in TO package for extended temp (−55°C to 125°C) |
| Trimmed Band-Gap Core | On-chip laser trimming ensures ±20 mV tolerance without external calibration |
Applications
| Portable Digital Multimeter Reference | Precision Thermocouple Cold-Junction Compensation |
|---|---|
Use Scenario: Used as 2.5 V reference in handheld DMMs powered by 9 V alkaline batteries with <30 μA standby current. IC Role / Device Role / Timing Role: Provides stable excitation voltage for ADC reference and internal current source generation. Use Value: Enables 4½-digit measurement accuracy while extending battery life beyond 1 year due to 20 μA min operating current. | Use Scenario: Integrated into thermocouple interface circuits to compensate for cold-junction temperature drift. IC Role / Device Role / Timing Role: Supplies precise 2.5 V reference for Kelvin-based current sourcing (e.g., 1.8 μA/°K) in compensation networks. Use Value: Achieves <±1°C error over 0°C–100°C range using only passive R adjustments, no microcontroller required. |
| Micropower 5 V Regulator Reference | Calibration Standard in Field Service Tools |
Use Scenario: Drives feedback network of low-quiescent LDO (e.g., TLV700) to generate stable 5 V rail from variable input. IC Role / Device Role / Timing Role: Serves as precision voltage setpoint in adjustable regulator loop. Use Value: Maintains ±0.5% output regulation across 3.3 V–12 V input and 100 μA–10 mA load, even with 10 μF ceramic output cap. | Use Scenario: Embedded in handheld calibration tools used for field verification of pressure transducers and RTDs. IC Role / Device Role / Timing Role: Acts as traceable 2.5 V reference for self-test and zero-adjust functions. Use Value: Supports 20 ppm/1000 hr stability and 150 ppm/°C TC - meets ANSI/NCSL Z540 calibration traceability requirements. |
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 | Tighter ±10 mV (±0.4%) initial tolerance; same TO-92 package and 0°C–70°C range | Better suited for 14-bit ADC references or factory-calibrated sensors requiring tighter initial accuracy | Select when ±10 mV tolerance is mandatory and cost premium is acceptable |
| LM285BZ-2.5/NOPB | Same TO-92 package but −40°C to +85°C operating range; ±20 mV tolerance identical | Required for industrial environments exceeding 70°C ambient (e.g., motor control enclosures) | Choose when extended temperature range is needed without changing PCB layout |
Compared with LM385BXZ-2.5/NOPB, LM385BZ-2.5/LFT7 trades ±10 mV initial accuracy for lower cost and tape-and-reel readiness; versus LM285BZ-2.5/NOPB, it sacrifices −40°C capability for optimized cost in commercial-grade applications.
Availability
LM385BZ-2.5/LFT7 is available at Aetrix Electronics and suitable for portable instrumentation, field service tools, and industrial sensor interfaces requiring stable component supply, RoHS-compliant packaging, and tape-and-reel delivery for SMT production.
Supply support for LM385BZ-2.5/LFT7 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, embedded processing, and digital signal technologies with over 50 years of innovation in precision analog ICs.
The LM385 family is designed specifically for micropower, 2-terminal voltage reference applications in battery-operated and space-constrained systems where low operating current, stability, and ease of use are essential.
FAQ
What is the operating temperature range for LM385BZ-2.5/LFT7?
The LM385BZ-2.5/LFT7 is specified for operation from 0°C to 70°C. This commercial-grade range aligns with standard indoor and consumer-grade electronics environments. It is distinct from the LM285-2.5-N (−40°C to +85°C) and LM185-2.5-N (−55°C to +125°C), which support wider industrial and military temperature ranges. Always verify ambient and junction temperatures in final layout.
Does LM385BZ-2.5/LFT7 require an external capacitor for stability?
No, the LM385BZ-2.5/LFT7 is explicitly designed to be stable with capacitive loads up to at least 10 μF, eliminating the need for series isolation resistors or external compensation. This feature simplifies design in battery-powered systems like portable meters and reduces bill-of-materials count. TI confirms stability across the full 20 μA–20 mA operating current range with typical ceramic or tantalum output caps.
What is the minimum operating current for LM385BZ-2.5/LFT7?
The LM385BZ-2.5/LFT7 has a minimum operating current of 20 μA, verified across the full 0°C to 70°C temperature range. At this current, it maintains 2.5 V output within ±20 mV tolerance and exhibits low dynamic impedance. This enables ultra-low-power applications such as multimeter standby modes or energy-harvesting sensor nodes where average current must remain below 30 μA.
How does the pinout of LM385BZ-2.5/LFT7 differ from SOIC-packaged variants?
The LM385BZ-2.5/LFT7 uses a 3-pin TO-92 package (Pins 1=Cathode, 2=Anode, 3=DAP), whereas SOIC variants (e.g., LM385BM-2.5/NOPB) use an 8-pin SOIC package with Pins 1 and 2 assigned as Cathode and Anode, and remaining pins unused or NC. Pin 3 in TO-92 is not electrically functional as a signal pin - it is the die attach pad and may be left floating or tied to Pin 2 per TI's Figure 1 guidance.
Is LM385BZ-2.5/LFT7 RoHS compliant and lead-free?
Yes, LM385BZ-2.5/LFT7 is RoHS and Green compliant per TI's packaging documentation. It carries "RoHS & Green" eco-plan designation, with lead finish specified as "Call TI" - indicating lead-free termination compatible with standard Pb-free reflow profiles (Level-1 MSL rating). The device meets JEDEC J-STD-020 moisture sensitivity requirements and is qualified for 260°C peak reflow in tape-and-reel format.
LM385BZ-2.5/LFT7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- 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:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM385BZ-2.5/LFT7 FAQ
1.How can I place an order for LM385BZ-2.5/LFT7 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BZ-2.5/LFT7 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 LM385BZ-2.5/LFT7 reliable?
The price and inventory of LM385BZ-2.5/LFT7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM385BZ-2.5/LFT7 is usually 5 days.
3.What payment methods are accepted for LM385BZ-2.5/LFT7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BZ-2.5/LFT7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BZ-2.5/LFT7?
LM385BZ-2.5/LFT7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BZ-2.5/LFT7 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 LM385BZ-2.5/LFT7?
For technical support, including LM385BZ-2.5/LFT7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BZ-2.5/LFT7 requirements.
6.How does Aetrix verify that LM385BZ-2.5/LFT7 is sourced from the original manufacturer or authorized distributors?
All LM385BZ-2.5/LFT7 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 LM385BZ-2.5/LFT7 meets industry standards.
7.What is the process for return or replacement of LM385BZ-2.5/LFT7?
All LM385BZ-2.5/LFT7 units undergo pre-shipment inspection (PSI). If there is an issue with LM385BZ-2.5/LFT7, 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 LM385BZ-2.5/LFT7 part is unused and in its original packaging.
Return procedure for LM385BZ-2.5/LFT7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM385BZ-2.5/LFT7 Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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