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Texas Instruments LM285LPRE3-2-5
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- Part No.:
- LM285LPRE3-2-5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
LM285LPRE3-2-5.pdf
- Description:
- IC VREF SHUNT 1.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,959
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Product details
Overview
LM285LPRE3-2-5 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, 20 μA to 20 mA operating current range, and 1.5 Ω maximum reference impedance over full temperature range. It serves as a stable reference in portable battery-powered instrumentation requiring low quiescent current and high long-term stability.
For engineers reviewing the LM285LPRE3-2-5 datasheet, LM285LPRE3-2-5 pinout, LM285LPRE3-2-5 application, or LM285LPRE3-2-5 equivalent, key selection criteria include its TO-92 package compatibility, cathode-anode terminal configuration, -40°C to +85°C industrial temperature rating, and suitability for precision analog circuits where micropower operation and capacitive load tolerance are critical.
Technical Context
The LM285LPRE3-2-5 implements a floating shunt topology using an internal band-gap reference core with high-gain amplifier and shunt pass element, enabling stable regulation across both positive and negative configurations. Its internal frequency compensation ensures loop stability with any capacitive load, eliminating need for external compensation.
It operates exclusively in a single functional mode: fixed 2.5 V reference generation with no adjustability. Regulation requires minimum cathode current (IZ(MIN) = 8–20 μA), and voltage accuracy is maintained via on-chip trimming - yielding 2.462 V to 2.538 V initial tolerance at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V nominal; 2.462–2.538 V at 25°C - enables precision ADC/DAC biasing and sensor excitation within ±1.5% error budget |
| Tempco | ±20 ppm/°C over −40°C to +85°C - supports stable performance in unregulated ambient environments without calibration |
| Operating Current | 20 μA to 20 mA - allows use in ultra-low-power systems (e.g., coin-cell meters) and higher-current regulator feedback paths |
| Reference Impedance | ≤1.5 Ω over full temperature range - minimizes output voltage shift under dynamic load transients |
| Long-Term Drift | ±20 ppm/khr at 100 μA - ensures <0.2% voltage change over 10 years in battery-backed applications |
| Noise (10 Hz–10 kHz) | 120 μV broadband - suitable for 12-bit+ precision measurement front-ends without added filtering |
| Min Cathode Current | 8–20 μA - defines lowest usable supply current for regulation; enables direct connection to high-value resistors or current sources |
Pinout & Package
LM285LPRE3-2-5 uses the TO-92 (LP) 3-pin through-hole package (4.30 mm × 4.30 mm body), with leads arranged in standard emitter-base-collector order but functionally assigned as ANODE (pin 1), CATHODE (pin 2), and NC (pin 3). Pin 3 has no internal connection and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ANODE (Pin 1) | Common node, typically grounded | Serves as return path for cathode current; connects to system ground or negative rail in shunt configuration |
| CATHODE (Pin 2) | Shunt current/voltage input | Receives regulated current from external source; develops 2.5 V referenced to ANODE |
| NC (Pin 3) | No internal connection | Must be left floating; no electrical or thermal function - not used for heatsinking or grounding |
Key Features
| Feature | Design Value |
|---|---|
| Floating shunt architecture | Enables bidirectional use - functions identically in high-side or low-side reference configurations without polarity constraints |
| Capacitive load tolerance | Stable with unlimited capacitance on cathode - eliminates need for series resistance or isolation components in noisy environments |
| Micropower operation | 20 μA minimum operating current - extends shelf-life-limited battery life in portable instruments beyond 5 years |
| On-chip trimmed accuracy | Initial tolerance ≤±1.5% - reduces or eliminates system-level calibration steps in production test flow |
| Low dynamic impedance | 0.2–0.6 Ω typical at 100 μA - maintains reference stability during fast-slewing analog signal acquisition |
Applications
| Portable Meter References | Current-Loop Instrumentation |
|---|---|
Use Scenario: Handheld multimeters and clamp meters powered by 9 V alkaline batteries. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for ADC conversion of measured voltage/current. Use Value: Enables 3.5-digit resolution with <0.1% full-scale error over battery discharge curve and temperature variation. |
Use Scenario: 4–20 mA transmitter modules in industrial process sensors. IC Role / Device Role / Timing Role: Sets precision current-sense threshold in op-amp-based loop drivers. Use Value: Maintains loop accuracy within ±0.05% over −40°C to +70°C without active temperature compensation. |
| Battery-Operated Systems | Panel Meters |
Use Scenario: Remote environmental data loggers using CR2032 coin cells. IC Role / Device Role / Timing Role: Supplies reference for low-power microcontroller ADC and sensor biasing. Use Value: Draws only 20 μA quiescent current, extending operational lifetime to >2 years per cell. |
Use Scenario: DIN-rail mounted digital panel meters in factory control panels. IC Role / Device Role / Timing Role: Generates stable reference for LED driver and display scaling circuitry. Use Value: Eliminates drift-induced reading errors during extended uptime (>10,000 hours). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BLP-2-5 | Same TO-92 package, but rated 0°C to +70°C and ±2.5% initial tolerance (2.425–2.575 V) | Targeted at commercial-grade instrumentation; lacks extended temperature support and tighter initial accuracy | Select when cost sensitivity outweighs industrial temp range and precision requirements |
| TLVH431ACLP | Adjustable 1.24–18 V shunt reference; 3-pin TO-92; 0.5% initial tolerance; 50 ppm/°C tempco | Requires external resistor network for 2.5 V setting; higher noise (200 μV) and less stable under capacitive loads | Choose only if adjustable output or higher current capability (up to 100 mA) is required |
Compared with LM385BLP-2-5 and TLVH431ACLP, LM285LPRE3-2-5 uniquely combines industrial temperature range, tightest initial tolerance among TO-92 2.5 V shunts, and guaranteed capacitive-load stability - making it optimal for field-deployed, battery-powered precision analog systems.
Availability
LM285LPRE3-2-5 is available at Aetrix Electronics and suitable for portable test instruments, battery-operated systems, and current-loop transmitters requiring stable component supply with long lifecycle assurance.
Supply support for LM285LPRE3-2-5 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 leadership in precision analog ICs and power management solutions.
LM285LPRE3-2-5 belongs to TI's micropower voltage reference product line, designed specifically for low-power, high-stability applications in portable and industrial instrumentation where battery life and long-term accuracy are critical.
FAQ
What is the operating temperature range of the LM285LPRE3-2-5?
The LM285LPRE3-2-5 is specified for operation from −40°C to +85°C, qualifying it for industrial and automotive under-hood environments. This extended range distinguishes it from the LM385-2.5 (0°C to +70°C) and LM385B-2.5 (0°C to +70°C), and is confirmed in the Electrical Characteristics table and Package Addendum of the SLVS023L datasheet.
Does the LM285LPRE3-2-5 require external capacitors for stability?
No, the LM285LPRE3-2-5 does not require external capacitors for stability. Its internal frequency compensation ensures loop stability with any capacitive load on the cathode pin - a key design feature explicitly stated in Section 7.3 and validated in Figure 5 (Reference Impedance vs Frequency) of the datasheet.
What is the minimum cathode current needed for regulation in the LM285LPRE3-2-5?
The LM285LPRE3-2-5 requires a minimum cathode current (IZ(MIN)) of 8–20 μA across its operating temperature range, as specified in Section 6.5 Electrical Characteristics. At 25°C, regulation begins reliably at 20 μA; lower currents may sustain regulation but are not guaranteed over temperature extremes.
Can the LM285LPRE3-2-5 be used in a high-side reference configuration?
Yes, the LM285LPRE3-2-5 supports high-side reference use due to its floating shunt architecture. As described in Section 7.3, the device has no ground reference constraint - the anode can be tied to a positive rail while the cathode supplies the reference voltage to downstream circuitry, enabling flexible placement in both high- and low-side topologies.
What is the long-term stability specification for the LM285LPRE3-2-5?
The LM285LPRE3-2-5 exhibits ±20 ppm/khr long-term drift at 100 μA cathode current, as documented in Section 6.5 Electrical Characteristics. This equates to approximately ±0.18% total drift over 10 years of continuous operation - a critical parameter for battery-backed systems and field-deployed instrumentation requiring minimal recalibration.
LM285LPRE3-2-5 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
LM285LPRE3-2-5 FAQ
1.How can I place an order for LM285LPRE3-2-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285LPRE3-2-5 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 LM285LPRE3-2-5 reliable?
The price and inventory of LM285LPRE3-2-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM285LPRE3-2-5 is usually 5 days.
3.What payment methods are accepted for LM285LPRE3-2-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285LPRE3-2-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285LPRE3-2-5?
LM285LPRE3-2-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285LPRE3-2-5 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 LM285LPRE3-2-5?
For technical support, including LM285LPRE3-2-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285LPRE3-2-5 requirements.
6.How does Aetrix verify that LM285LPRE3-2-5 is sourced from the original manufacturer or authorized distributors?
All LM285LPRE3-2-5 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 LM285LPRE3-2-5 meets industry standards.
7.What is the process for return or replacement of LM285LPRE3-2-5?
All LM285LPRE3-2-5 units undergo pre-shipment inspection (PSI). If there is an issue with LM285LPRE3-2-5, 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 LM285LPRE3-2-5 part is unused and in its original packaging.
Return procedure for LM285LPRE3-2-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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