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Texas Instruments LM285Z-2.5/LFT7
- Part No.:
- LM285Z-2.5/LFT7
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM285Z-2.5/LFT7.pdf
- Description:
- IC VREF SHUNT 1.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,627
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Product details
Overview
LM285Z-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 regulators, and precision analog circuitry requiring low quiescent current and wide temperature stability.
For engineers reviewing the LM285Z-2.5/LFT7 datasheet, LM285Z-2.5/LFT7 pinout, LM285Z-2.5/LFT7 application, or LM285Z-2.5/LFT7 equivalent, key selection criteria include its TO-92 package compatibility, −40°C to +85°C operating range, 30 ppm/°C temperature coefficient (X suffix), and suitability for micropower current sources and thermocouple cold-junction compensation.
Technical Context
The LM285Z-2.5/LFT7 implements a band-gap reference architecture using only transistors and resistors, enabling low noise (120 μV rms, 10 Hz–10 kHz) and excellent long-term stability (20 ppm after 1000 hours). Its two-terminal configuration simplifies layout and eliminates external bias components.
It features exceptional capacitive load tolerance and operates across a wide dynamic current range-enabling direct replacement of older references while maintaining regulation under varying supply conditions and load transients typical in portable instrumentation and sensor signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.500 V ±20 mV at 25°C - ensures accurate ADC/DAC biasing and calibration within 0.8% error without trimming. |
| Initial Tolerance | ±0.8% (A grade) - reduces system-level calibration effort in production test fixtures and portable measurement tools. |
| Operating Current Range | 20 μA to 20 mA - supports ultra-low-power sleep modes and high-current reference buffering without external circuitry. |
| Dynamic Impedance | 0.6 Ω at 100 μA - minimizes output voltage shift under load transients, critical for precision current-source designs. |
| Temperature Coefficient | 30 ppm/°C (X suffix) - guarantees ≤0.75 mV drift over −40°C to +85°C, suitable for industrial-grade sensor front-ends. |
| Long-Term Stability | 20 ppm (1000 hr @ 25°C) - enables reliable performance in field-deployed equipment without periodic recalibration. |
Pinout & Package
LM285Z-2.5/LFT7 is housed in a TO-92 molded plastic package (Package Drawing LP0003A) with 3 leads. Pin 1 is the cathode, Pin 2 is the anode, and Pin 3 is attached to the die attach pad (DAP) and may be connected to Pin 2 or left floating per TI's recommended layout guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Cathode | Output node - connects to regulated load or feedback network; reverse-biased during normal operation. |
| Pin 2 | Anode | Current sink terminal - ties to ground or current-setting resistor; defines operating current path. |
| Pin 3 | Die Attach Pad (DAP) | Thermal and mechanical tie - electrically isolated but thermally coupled; connect to Pin 2 for improved thermal stability or leave floating per design requirements. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with unlimited capacitive loading - eliminates need for series isolation resistors in battery-powered meter designs. |
| Low Noise Performance | 120 μV rms (10 Hz–10 kHz) - preserves signal integrity in high-resolution data acquisition systems and thermocouple interfaces. |
| Wide Operating Current | 20 μA minimum - enables operation from coin cells or energy-harvesting sources with sub-100 μA standby budgets. |
| Hermetic Alternative Available | LM285BXZ-2.5/NOPB offers same TO-92 footprint with tighter 0.8% tolerance and enhanced reliability for mission-critical applications. |
Applications
| Portable Multimeters | Micropower Sensor Signal Conditioning |
|---|---|
Use Scenario: Handheld digital multimeter requiring stable 2.5 V reference for 16-bit ADC conversion across battery life. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing precision voltage基准 for analog front-end scaling and offset correction. Use Value: Enables >1000-hour battery life with <30 μA total system quiescent current while maintaining ±0.1% full-scale accuracy over temperature. | Use Scenario: Low-power environmental sensor node measuring temperature and humidity with 12-bit SAR ADC. IC Role / Device Role / Timing Role: Reference source for ratiometric sensor excitation and ADC reference, eliminating supply-voltage dependency. Use Value: Delivers 2.5 V ±0.8% with 30 ppm/°C drift, reducing calibration frequency and improving long-term measurement repeatability. |
| Thermocouple Cold-Junction Compensation | Precision Current Sources (1 μA–1 mA) |
Use Scenario: Industrial thermocouple interface board compensating for cold-junction temperature in 0°C–100°C range. IC Role / Device Role / Timing Role: Stable voltage reference driving precision current source that heats a thermistor to match junction temperature. Use Value: 20 ppm/1000 hr stability and low 120 μV noise ensure <0.5°C absolute accuracy in calibrated systems. | Use Scenario: Calibration-grade current source for sensor excitation and metrology equipment. IC Role / Device Role / Timing Role: Voltage reference setting current through precision resistor in constant-current loop topology. Use Value: 0.6 Ω dynamic impedance and 20 μA min operating current enable stable 1 μA–1 mA sourcing with <0.01% line regulation error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM285BXZ-2.5/NOPB | Tighter ±0.8% initial tolerance (same X suffix), identical TO-92 package and pinout. | Preferred for high-accuracy calibration equipment where initial error budget is constrained. | Select when guaranteed A-grade tolerance is required without redesign; same PCB footprint and thermal profile. |
| LM385Z-2.5/NOPB | Same TO-92 package, but rated for 0°C to 70°C ambient; 150 ppm/°C tempco (standard grade). | Suitable for commercial-grade consumer electronics with limited temperature range and relaxed stability needs. | Choose for cost-sensitive, non-industrial applications where extended temperature range is unnecessary. |
Compared with LM285BXZ-2.5/NOPB, LM285Z-2.5/LFT7 offers identical packaging and thermal rating but trades guaranteed A-grade tolerance for broader availability and tape-and-reel logistics; versus LM385Z-2.5/NOPB, it provides superior temperature stability and industrial-grade operating range at minimal cost premium.
Availability
LM285Z-2.5/LFT7 is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor nodes, thermocouple interfaces, and precision current-source designs requiring stable component supply with consistent lead-time and volume scalability.
Supply support for LM285Z-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 and embedded processing technologies, with decades of expertise in precision reference design and high-reliability manufacturing.
The LM285 series belongs to TI's micropower voltage reference product line, engineered specifically for battery-operated and energy-constrained systems where low quiescent current, tight initial tolerance, and robust temperature performance are essential.
FAQ
What is the operating temperature range of the LM285Z-2.5/LFT7?
The LM285Z-2.5/LFT7 is rated for operation from −40°C to +85°C. This industrial-grade temperature range ensures reliable performance in outdoor sensors, factory automation modules, and portable test equipment exposed to ambient thermal cycling. The device's 30 ppm/°C temperature coefficient (X suffix) is specified across this full range, supporting predictable voltage drift behavior in real-world deployments.
Does the LM285Z-2.5/LFT7 require external capacitors for stability?
No, the LM285Z-2.5/LFT7 does not require external capacitors for stability. Its internal design provides exceptional tolerance to capacitive loading, allowing direct connection to large bypass or filter capacitors without risk of oscillation. This feature simplifies PCB layout and eliminates stability-related debug cycles in micropower applications such as handheld meters and remote sensor nodes.
What is the minimum operating current for the LM285Z-2.5/LFT7?
The LM285Z-2.5/LFT7 has a minimum operating current of 20 μA, verified across the full −40°C to +85°C temperature range. This ultra-low threshold enables use in energy-harvesting systems and coin-cell-powered devices where standby current must remain below 50 μA. At 20 μA, the device maintains its 2.5 V output within specification and delivers 0.6 Ω dynamic impedance.
How is pin 3 used on the LM285Z-2.5/LFT7 TO-92 package?
Pin 3 on the LM285Z-2.5/LFT7 is the die attach pad (DAP), electrically isolated from the internal circuit but thermally coupled to the silicon die. TI recommends connecting Pin 3 to Pin 2 (anode) to improve thermal stability in high-precision applications, or leaving it floating if thermal coupling is not required. It must never be connected to a different potential than Pin 2.
Is the LM285Z-2.5/LFT7 RoHS compliant and lead-free?
Yes, the LM285Z-2.5/LFT7 is RoHS compliant and lead-free. Per TI's Package Option Addendum, it carries an "RoHS & Green" eco plan designation, uses lead-free lead finish (Call TI indicates custom finish; standard variants use matte tin), and meets JEDEC MSL Level-1 reflow requirements. The device marking "LM285 Z-2.5" confirms compliance per TI's 2024 packaging documentation.
LM285Z-2.5/LFT7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM285Z-2.5/LFT7 FAQ
1.How can I place an order for LM285Z-2.5/LFT7 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285Z-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 LM285Z-2.5/LFT7 reliable?
The price and inventory of LM285Z-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 LM285Z-2.5/LFT7 is usually 5 days.
3.What payment methods are accepted for LM285Z-2.5/LFT7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285Z-2.5/LFT7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285Z-2.5/LFT7?
LM285Z-2.5/LFT7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285Z-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 LM285Z-2.5/LFT7?
For technical support, including LM285Z-2.5/LFT7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285Z-2.5/LFT7 requirements.
6.How does Aetrix verify that LM285Z-2.5/LFT7 is sourced from the original manufacturer or authorized distributors?
All LM285Z-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 LM285Z-2.5/LFT7 meets industry standards.
7.What is the process for return or replacement of LM285Z-2.5/LFT7?
All LM285Z-2.5/LFT7 units undergo pre-shipment inspection (PSI). If there is an issue with LM285Z-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 LM285Z-2.5/LFT7 part is unused and in its original packaging.
Return procedure for LM285Z-2.5/LFT7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM285Z-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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