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Texas Instruments LM285LPR-2-5
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- Part No.:
- LM285LPR-2-5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
LM285LPR-2-5.pdf
- Description:
- IC VREF SHUNT 1.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:6,048
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Product details
Overview
LM285LPR-2-5 from Texas Instruments is a micropower, two-terminal, band-gap shunt voltage reference delivering a precise 2.5 V output with ±20 ppm/°C temperature coefficient, 2.462 V to 2.538 V initial tolerance at 25°C, and 1.5 Ω max reference impedance over full temperature range. It operates across 20 μA–20 mA cathode current and supports battery-operated portable meters and low-power analog signal conditioning.
For engineers reviewing the LM285LPR-2-5 datasheet, LM285LPR-2-5 pinout, LM285LPR-2-5 application, or LM285LPR-2-5 equivalent, key selection criteria include its −40°C to +85°C operating range, TO-92 package compatibility, low 120 µV broadband noise (10 Hz–10 kHz), and ability to maintain regulation under capacitive loading without external compensation.
Technical Context
The LM285LPR-2-5 implements a floating shunt architecture using an internal band-gap reference and high-gain amplifier to regulate voltage between cathode and anode. Its design enables stable operation with any capacitive load due to on-chip frequency compensation and eliminates need for external stabilization components.
It functions exclusively as a fixed 2.5 V shunt reference requiring minimum cathode current of 8–20 µA for regulation, with dynamic impedance as low as 0.2 Ω at 100 µA (25°C) and long-term drift of ±20 ppm/khr. The device draws no quiescent current when unpowered and tolerates reverse voltage up to 30 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.462 V to 2.538 V at 25°C - ensures precision analog measurement within ±1.5% initial error for metering and sensor interfaces |
| Tempco | ±20 ppm/°C - guarantees ≤0.5 mV drift over −40°C to +85°C ambient, critical for field-deployed instrumentation |
| Cathode Current Range | 20 μA to 20 mA - supports ultra-low-power sleep modes and higher-current regulation in active circuits |
| Reference Impedance | 1.5 Ω max over full temperature - maintains output stability under varying load and supply conditions |
| Noise (10 Hz–10 kHz) | 120 µV broadband - minimizes error in high-resolution ADC references and precision amplifiers |
| Long-Term Drift | ±20 ppm/khr - ensures calibration integrity over years in battery-powered portable equipment |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive-adjacent environments without derating |
Pinout & Package
LM285LPR-2-5 uses the TO-92 (LP) package: 4.30 mm × 4.30 mm body, 3-pin through-hole format with standard lead spacing. Pin 1 = ANODE (common, typically grounded); Pin 2 = CATHODE (shunt current/voltage input); Pin 3 = NC (no internal connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ANODE | Common terminal | Typically connected to ground; forms return path for cathode current and defines reference potential |
| CATHODE | Shunt current input | Current must be sourced into this pin to establish 2.5 V across ANODE–CATHODE; regulates by sinking excess current |
| NC | No internal connection | Unused mechanical pin; electrically isolated and must not be connected to circuit nodes |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive-load immunity | Stable with unlimited capacitance on cathode - eliminates need for series resistance or external compensation networks |
| Micropower operation | Functional down to 20 μA cathode current - extends battery life in portable meters to near shelf-life duration |
| Low dynamic impedance | 0.2 Ω typical at 100 µA (25°C) - suppresses output perturbation from load transients and supply ripple |
| Band-gap core | Low-noise, long-term-stable reference element - provides <120 µV noise and ±20 ppm/khr aging for metrology-grade accuracy |
| Floating shunt topology | Enables both high-side and low-side regulation - usable in positive or negative supply rails without level-shifting circuitry |
Applications
| Portable Meter References | Current-Loop Instrumentation |
|---|---|
Use Scenario: Handheld multimeters and clamp meters requiring stable, low-drift reference for ADC conversion and display scaling. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing 2.5 V reference node referenced to system ground. Use Value: Enables 3.5-digit accuracy over full temperature range with no warm-up time or external trimming. |
Use Scenario: 4–20 mA transmitter modules where reference voltage sets loop current via precision resistor. IC Role / Device Role / Timing Role: Fixed 2.5 V shunt reference establishing exact voltage drop across sense resistor. Use Value: Maintains loop accuracy within ±0.1% over −40°C to +70°C, eliminating calibration drift in field instruments. |
| Battery-Operated Systems | Panel Meters |
Use Scenario: Remote environmental sensors powered by coin cells or AA batteries needing multi-year operation. IC Role / Device Role / Timing Role: Micropower voltage reference supplying excitation to bridge sensors and bias to op-amps. Use Value: Draws only 20 μA minimum, enabling >10-year battery life while preserving 2.5 V accuracy. |
Use Scenario: Industrial panel-mounted digital displays measuring voltage, current, or temperature. IC Role / Device Role / Timing Role: Primary reference for analog front-end and digitization circuitry. Use Value: Delivers ±1.5% initial tolerance and ±20 ppm/°C tempco-meeting ANSI C12.20 Class 0.2 accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385LPR-2-5 | Same TO-92 package and 2.5 V nominal output, but rated for 0°C to +70°C only and ±2.5% initial tolerance (vs. ±1.5% for LM285LPR-2-5) | Suitable for commercial-grade panel meters and non-industrial test gear where extended temperature range is unnecessary | Select LM385LPR-2-5 only if cost sensitivity outweighs −40°C operation and tighter initial tolerance requirements |
| TLVH431ACDBVR | Adjustable 3-terminal shunt reference (1.24 V base), SOT-23 package, 2% initial tolerance, 50 ppm/°C tempco, 0.3 Ω impedance | Requires external resistors for 2.5 V setting; better suited for programmable supplies than fixed-accuracy metrology | Choose TLVH431ACDBVR only when board space is constrained and adjustable output is acceptable |
Compared with LM385LPR-2-5 and TLVH431ACDBVR, LM285LPR-2-5 uniquely combines industrial temperature range, tightest initial tolerance, lowest tempco, and true two-terminal simplicity-making it optimal for portable, battery-critical, and high-accuracy analog systems where layout and calibration overhead must be minimized.
Availability
LM285LPR-2-5 is available at Aetrix Electronics and suitable for portable meter references, current-loop instrumentation, and battery-operated systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LM285LPR-2-5 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 company specializing in analog and embedded processing technologies, with decades of leadership in precision voltage references and power management ICs.
The LM285 series belongs to TI's micropower shunt reference product line, designed specifically for ultra-low-power, high-accuracy analog systems including portable test equipment, industrial sensors, and battery-constrained instrumentation.
FAQ
What is the operating temperature range of the LM285LPR-2-5?
The LM285LPR-2-5 is specified for operation from −40°C to +85°C. This industrial-grade temperature range is confirmed in the Electrical Characteristics table and Recommended Operating Conditions section of the official TI datasheet SLVS023L. The LM285LPR-2-5 maintains its 2.5 V reference accuracy and 1.5 Ω max reference impedance across this full range, distinguishing it from the commercial-grade LM385 variants.
Does the LM285LPR-2-5 require external capacitors for stability?
No, the LM285LPR-2-5 does not require external capacitors for stability. Its internal frequency compensation ensures unconditional stability with any capacitive load on the cathode pin, as explicitly stated in the Functional Description and Detailed Description sections of the datasheet. This eliminates risk of oscillation and simplifies PCB layout-especially beneficial in compact portable meter designs where board space is limited.
What is the minimum cathode current needed for regulation in the LM285LPR-2-5?
The LM285LPR-2-5 requires a minimum cathode current (IZ(MIN)) of 8 µA to 20 µA across its operating temperature range, per the Electrical Characteristics table. At 25°C, regulation is guaranteed above 8 µA; full-range specification requires ≥20 µA. This low threshold enables use in ultra-low-power wake-up circuits and energy-harvesting applications where supply current is severely constrained.
How does the LM285LPR-2-5 differ from the LM385-2.5 in terms of performance?
The LM285LPR-2-5 offers tighter initial voltage tolerance (±1.5% vs. ±2.5% for LM385-2.5), lower temperature coefficient (±20 ppm/°C vs. same spec but verified over wider range), and extended operating temperature (−40°C to +85°C vs. 0°C to +70°C). Both share identical TO-92 packaging and core band-gap architecture, but LM285LPR-2-5 is optimized for industrial and portable applications demanding higher accuracy and broader environmental resilience.
Can the LM285LPR-2-5 be used in negative voltage reference configurations?
Yes, the LM285LPR-2-5 can be used in negative voltage reference configurations due to its floating shunt topology. As described in Section 7.3, the device has no internal connection to ground or supply rail-only cathode and anode terminals-allowing it to regulate voltage across either polarity. For example, connecting the anode to −5 V and sinking current into the cathode yields a −2.5 V reference relative to system ground.
LM285LPR-2-5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- 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:
- 20ppm/°C Typical
- 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
LM285LPR-2-5 FAQ
1.How can I place an order for LM285LPR-2-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285LPR-2-5 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 LM285LPR-2-5 reliable?
The price and inventory of LM285LPR-2-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM285LPR-2-5 is usually 5 days.
3.What payment methods are accepted for LM285LPR-2-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285LPR-2-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285LPR-2-5?
LM285LPR-2-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285LPR-2-5 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 LM285LPR-2-5?
For technical support, including LM285LPR-2-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285LPR-2-5 requirements.
6.How does Aetrix verify that LM285LPR-2-5 is sourced from the original manufacturer or authorized distributors?
All LM285LPR-2-5 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 LM285LPR-2-5 meets industry standards.
7.What is the process for return or replacement of LM285LPR-2-5?
All LM285LPR-2-5 units undergo pre-shipment inspection (PSI). If there is an issue with LM285LPR-2-5, 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 LM285LPR-2-5 part is unused and in its original packaging.
Return procedure for LM285LPR-2-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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