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Texas Instruments LM285LPE3-2-5
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- Part No.:
- LM285LPE3-2-5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM285LPE3-2-5.pdf
- Description:
- IC VREF SHUNT 1.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,797
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Product details
Overview
LM285LPE3-2-5 from Texas Instruments is a micropower, two-terminal band-gap voltage reference delivering a precise 2.5 V output with ±20 ppm/°C temperature coefficient, 20 μA to 20 mA operating current range, and 1.5 Ω maximum reference impedance over full temperature range. It serves as a stable shunt reference in portable metering, battery-operated instrumentation, and low-power analog signal conditioning circuits.
For engineers reviewing the LM285LPE3-2-5 datasheet, LM285LPE3-2-5 pinout, LM285LPE3-2-5 application, or LM285LPE3-2-5 equivalent, key selection criteria include its −40°C to +85°C industrial temperature range, TO-92 package compatibility with high-capacitance loads, low 120 µV broadband noise, and minimal 8 µA minimum cathode current requirement.
Technical Context
The LM285LPE3-2-5 implements a floating shunt topology using an internal band-gap reference core, high-gain amplifier, and shunt pass element to maintain regulation between cathode and anode. Its fully compensated loop ensures stability with capacitive loads up to 10 µF without external compensation.
It operates exclusively in shunt mode: current must be sourced into the cathode to establish 2.5 V across cathode–anode, with regulation active only when cathode current exceeds 8 µA. No adjustment or trimming is possible-the device provides a fixed 2.5 V reference with no user-configurable modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.462 V to 2.538 V at 25°C - tight 1.5% initial tolerance enables direct use in 12-bit ADC references without calibration. |
| Temperature Coefficient | ±20 ppm/°C over −40°C to +85°C - ensures ≤1.25 mV drift across full industrial range for precision sensor biasing. |
| Operating Current Range | 20 µA to 20 mA - supports ultra-low-power sleep states (e.g., 20 µA battery monitoring) and higher-current analog front-ends. |
| Reference Impedance | ≤1.5 Ω over full temperature - maintains voltage stability under dynamic load transients in current-loop transmitters. |
| Long-Term Drift | ±20 ppm/khr at 100 µA - guarantees <0.2% output shift over 10 years in sealed portable instruments. |
| Broadband Noise | 120 µV RMS (10 Hz–10 kHz) - low enough for 16-bit SAR ADC reference without additional filtering. |
| Min Cathode Current | 8 µA - enables operation from high-value resistive dividers (e.g., 1 MΩ from 3.3 V), reducing quiescent power. |
Pinout & Package
LM285LPE3-2-5 uses the TO-92 (LP) package: 4.30 mm × 4.30 mm body, 3-pin through-hole format with standard lead spacing. The package supports manual soldering and wave soldering, with no internal connections on unused pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ANODE | Common terminal | Typically connected to ground or system return; forms reference node with cathode for 2.5 V potential difference. |
| CATHODE | Shunt current/voltage input | Current sink node where external supply sources current; voltage develops across cathode–anode to regulate at 2.5 V. |
| NC | No internal connection | Pin 3 is unconnected die bond wire stub; must remain unconnected or tied to ANODE for mechanical stability only. |
Key Features
| Feature | Design Value |
|---|---|
| Floating shunt architecture | Enables both positive and negative regulation topologies-e.g., cathode grounded for negative reference or anode grounded for positive reference. |
| Capacitive load tolerance | Stable with ≥10 µF ceramic bypass capacitance on cathode, eliminating need for series resistance in noisy environments. |
| Low dynamic impedance | 0.6 Ω typical at 100 µA ensures <1 mV droop during 1 mA step load changes in portable data loggers. |
| Micropower operation | 20 µA minimum operating current extends shelf life of battery-powered panel meters beyond 5 years. |
| Band-gap core with trimming | Laser-trimmed die achieves 1.5% initial accuracy without external calibration, reducing BOM count in field-deployed sensors. |
Applications
| Portable Meter References | Portable Test Instruments |
|---|---|
Use Scenario: Handheld multimeter requiring stable 2.5 V reference for 3½-digit ADC scaling across battery discharge cycle. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precision scaling point for analog-to-digital conversion. Use Value: 20 µA–20 mA operating range accommodates both 9 V alkaline and 3.7 V Li-ion supplies without redesign. |
Use Scenario: Battery-powered oscilloscope probe calibration circuit needing low-drift reference over 0–40°C ambient. IC Role / Device Role / Timing Role: Fixed 2.5 V reference source for DAC-based offset correction in analog front-end. Use Value: ±20 ppm/°C TC ensures <±0.5 mV error across operating range, meeting Class II instrument accuracy. |
| Battery-Operated Systems | Current-Loop Instrumentation |
Use Scenario: Wireless sensor node powered by CR2032 coin cell, requiring reference for RTD measurement over 10-year deployment. IC Role / Device Role / Timing Role: Low-quiescent-current shunt reference enabling microamp-level system sleep current. Use Value: 8 µA minimum cathode current allows direct resistor bias from 3.3 V rail, eliminating LDO overhead. |
Use Scenario: 4–20 mA transmitter in industrial process control, where reference sets loop compliance voltage. IC Role / Device Role / Timing Role: Precision 2.5 V node for op-amp summing junction in current-output stage. Use Value: ≤1.5 Ω reference impedance prevents gain error drift during 20 mA loop current transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385LPE3-2-5 | Same TO-92 package and 2.5 V output, but rated for 0°C to +70°C only; 3% initial tolerance vs. LM285LPE3-2-5's 1.5%. | Restricted to commercial-temperature consumer test gear; unsuitable for automotive or industrial ambient extremes. | Select when cost sensitivity outweighs temperature range and accuracy requirements. |
| TLVH431ACDBVR | Adjustable shunt reference (2.5 V min), SOT-23-3, 1% initial tolerance, 50 ppm/°C TC, 80 µA min cathode current. | Requires external resistor network for 2.5 V setting; higher min current increases power in ultra-low-power designs. | Choose for space-constrained PCBs where SOT-23 footprint is mandatory and adjustable voltage may be future-proofing. |
Compared with LM385LPE3-2-5 and TLVH431ACDBVR, LM285LPE3-2-5 uniquely combines industrial temperature range, 1.5% accuracy, and sub-10 µA start-up current in TO-92-making it optimal for long-life, wide-ambient portable instrumentation where layout simplicity and power efficiency are critical.
Availability
LM285LPE3-2-5 is available at Aetrix Electronics and suitable for portable meter references, battery-operated systems, and current-loop instrumentation requiring stable component supply with guaranteed long-term continuity.
Supply support for LM285LPE3-2-5 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 analog ICs and voltage references.
The LM285 series was designed specifically for micropower, high-stability shunt references in portable and battery-critical applications-emphasizing low start-up current, wide temperature operation, and robust capacitive-load immunity.
FAQ
What is the operating temperature range of the LM285LPE3-2-5?
The LM285LPE3-2-5 is specified for operation from −40°C to +85°C, making it suitable for industrial and extended-temperature portable equipment. This range is confirmed in the TI datasheet SLVS023L, Table 6.3 Recommended Operating Conditions, and distinguishes it from the commercial-grade LM385 variants limited to 0°C–70°C.
Does the LM285LPE3-2-5 require external capacitors for stability?
No, the LM285LPE3-2-5 features internal frequency compensation and remains stable with capacitive loads up to 10 µF on the cathode node. A 0.1 µF ceramic capacitor is optional for noise reduction but not required for loop stability-enabling simplified layout in space-constrained portable instruments.
What is the minimum cathode current needed for regulation in the LM285LPE3-2-5?
The LM285LPE3-2-5 requires a minimum cathode current of 8 µA to initiate and maintain regulation, as specified in Electrical Characteristics (Table 6.5). Below this threshold, the output voltage drops nonlinearly; above it, regulation holds tightly across the full 20 µA–20 mA range.
Can the LM285LPE3-2-5 be used in negative-reference configurations?
Yes, the LM285LPE3-2-5's floating shunt architecture supports negative-reference use: connect the cathode to system ground and the anode to a negative rail, yielding −2.5 V referenced to ground. This is explicitly supported in the Functional Description (Section 7.3) and enables bipolar sensor biasing without additional components.
How does the LM285LPE3-2-5 compare to the LM385B-2.5 in accuracy and temperature range?
The LM285LPE3-2-5 matches the LM385B-2.5's 1.5% initial tolerance and ±20 ppm/°C temperature coefficient but extends the operating range to −40°C to +85°C versus LM385B-2.5's 0°C to +70°C. Both share identical electrical specs in their overlapping range, but LM285LPE3-2-5 is the only TO-92 variant qualified for full industrial temperature operation.
LM285LPE3-2-5 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:
- 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
LM285LPE3-2-5 FAQ
1.How can I place an order for LM285LPE3-2-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285LPE3-2-5 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 LM285LPE3-2-5 reliable?
The price and inventory of LM285LPE3-2-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM285LPE3-2-5 is usually 5 days.
3.What payment methods are accepted for LM285LPE3-2-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285LPE3-2-5 transactions.
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4.How is shipping managed for LM285LPE3-2-5?
LM285LPE3-2-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285LPE3-2-5 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 LM285LPE3-2-5?
For technical support, including LM285LPE3-2-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285LPE3-2-5 requirements.
6.How does Aetrix verify that LM285LPE3-2-5 is sourced from the original manufacturer or authorized distributors?
All LM285LPE3-2-5 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 LM285LPE3-2-5 meets industry standards.
7.What is the process for return or replacement of LM285LPE3-2-5?
All LM285LPE3-2-5 units undergo pre-shipment inspection (PSI). If there is an issue with LM285LPE3-2-5, 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 LM285LPE3-2-5 part is unused and in its original packaging.
Return procedure for LM285LPE3-2-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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