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Texas Instruments LM285DRG4-2-5
- Part No.:
- LM285DRG4-2-5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285DRG4-2-5.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:370
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Product details
Overview
LM285DRG4-2-5 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 and 1.5 Ω maximum reference impedance over full temperature range. It operates across 20 μA to 20 mA cathode current and supports battery-operated portable meters requiring long shelf-life power efficiency.
For engineers reviewing the LM285DRG4-2-5 datasheet, LM285DRG4-2-5 pinout, LM285DRG4-2-5 application, or LM285DRG4-2-5 equivalent, key selection criteria include its −40°C to +85°C operating range, 2.462 V to 2.538 V initial tolerance at 25°C, low 120 µV broadband noise (10 Hz–10 kHz), and SOIC-8 package compatibility with standard reflow profiles.
Technical Context
The LM285DRG4-2-5 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 capacitive loads up to 10 µF without external compensation.
It functions exclusively in shunt mode: cathode accepts current input while anode connects to system ground. Regulation initiates only when cathode current exceeds 8 µA minimum, and dynamic impedance remains ≤1.5 Ω across −40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V nominal; 2.462 V to 2.538 V at 25°C - ensures precision analog measurement within ±1.5% initial error |
| Tempco | ±20 ppm/°C over −40°C to +85°C - enables stable reference in industrial ambient conditions |
| Operating Current Range | 20 μA to 20 mA - supports ultra-low-power sensor nodes and high-current regulator biasing |
| Reference Impedance | ≤1.5 Ω over full temperature range - minimizes load-induced voltage droop in precision circuits |
| Long-Term Drift | ±20 ppm/khr at 100 μA - guarantees stability for multi-year deployed instrumentation |
| Noise (10 Hz–10 kHz) | 120 µV RMS - suitable for 12-bit+ ADC reference without additional filtering |
| Min Cathode Current | 8 μA typical, 20 μA max - defines lowest usable supply current for regulation |
Pinout & Package
LM285DRG4-2-5 uses an 8-pin SOIC (D) package measuring 4.90 mm × 3.90 mm with 1.75 mm max height. Pin 1 is marked via notch or bevel; pins 1–4 and 5–8 are on opposing sides of the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ANODE (Pin 4) | Common terminal | Typically connected to system ground; forms return path for cathode current |
| CATHODE (Pin 8) | Shunt current/voltage input | Current injection point; develops regulated 2.5 V relative to ANODE |
| Pins 1, 2, 3, 5, 6, 7 | No internal connection | Electrically isolated; must not be soldered or biased to avoid mechanical stress or leakage paths |
Key Features
| Feature | Design Value |
|---|---|
| Band-gap reference core | Delivers low-noise, long-term-stable 2.5 V output without external trimming components |
| Capacitive-load tolerance | Stable with ≥10 µF bypass capacitance - eliminates need for series isolation resistors in noisy environments |
| Micropower operation | 20 μA minimum operating current enables >10-year battery life in portable meters |
| Floating shunt topology | Supports both high-side and low-side regulation configurations in single-supply or split-rail systems |
| On-chip trimmed tolerance | 1.5% initial accuracy at 25°C - reduces calibration burden in production test flow |
Applications
| Portable Meter References | Current-Loop Instrumentation |
|---|---|
Use Scenario: Handheld multimeters and clamp meters powered by alkaline or lithium coin cells. IC Role / Device Role / Timing Role: Provides stable 2.5 V reference for ADC front-end and display driver circuitry. Use Value: Enables 12-bit measurement resolution with <±0.5 LSB drift over battery discharge cycle. |
Use Scenario: 4–20 mA transmitter modules in process control sensors. IC Role / Device Role / Timing Role: Sets precision current-sense threshold and DAC reference in loop-powered transmitters. Use Value: Maintains ±0.1% full-scale accuracy across −40°C to +70°C ambient without recalibration. |
| Battery-Operated Systems | Panel Meters |
Use Scenario: Wireless sensor nodes with intermittent RF transmission and sleep-mode operation. IC Role / Device Role / Timing Role: Supplies reference voltage to ultra-low-power microcontroller ADC and voltage monitor. Use Value: Draws only 20 μA quiescent current, extending CR2032 battery life beyond 5 years in duty-cycled use. |
Use Scenario: Industrial panel-mounted digital displays for voltage, current, or temperature monitoring. IC Role / Device Role / Timing Role: Serves as master reference for multi-channel analog input conditioning and LED bar-graph drivers. Use Value: Delivers <1 mV output variation over 10-year field deployment due to low long-term drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385DRG4-2-5 | 0°C to +70°C operating range; 2.425 V–2.575 V initial tolerance (±3%) | Restricted to commercial-temperature industrial controls and non-critical test gear | Select when cost sensitivity outweighs extended temperature or tighter tolerance requirements |
| LM385BDRG4-2-5 | 0°C to +70°C range; same 2.462 V–2.538 V tolerance as LM285DRG4-2-5 but higher 1 Ω typical impedance at 25°C | Suitable for general-purpose analog circuits where thermal drift is mitigated by system-level calibration | Choose for legacy designs already qualified with LM385B family; verify layout thermal coupling |
Compared with LM385DRG4-2-5 and LM385BDRG4-2-5, the LM285DRG4-2-5 uniquely supports −40°C to +85°C operation with identical 1.5% tolerance, making it the only option for unheated outdoor or automotive under-hood instrumentation without derating.
Availability
LM285DRG4-2-5 is available at Aetrix Electronics and suitable for portable meter references, current-loop instrumentation, and battery-operated systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM285DRG4-2-5 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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with over 50 years of precision analog design heritage.
The LMx85 series was developed specifically for micropower, high-stability shunt voltage references in portable and battery-constrained applications-emphasizing low drift, wide current range, and robust capacitive-load immunity.
FAQ
What is the operating temperature range of the LM285DRG4-2-5?
The LM285DRG4-2-5 is rated for operation from −40°C to +85°C. This extended industrial temperature range distinguishes it from the LM385-2.5 (0°C to +70°C) and LM385B-2.5 (0°C to +70°C), enabling use in automotive under-hood, outdoor metering, and uncontrolled-environment industrial equipment where thermal extremes occur.
Does the LM285DRG4-2-5 require external capacitors for stability?
No, the LM285DRG4-2-5 features internal frequency compensation and is explicitly designed to remain stable with capacitive loads up to 10 µF on the cathode node. Unlike many shunt references, it does not require series isolation resistors or external compensation networks-even when driving large bypass or filter capacitors in portable instrument power rails.
What is the minimum cathode current needed for regulation in the LM285DRG4-2-5?
The LM285DRG4-2-5 requires a minimum cathode current of 8 µA (typical) to 20 µA (maximum) across its full temperature range to maintain regulation. Below this threshold, the output voltage drops nonlinearly; design must ensure the current-setting resistor or active source delivers ≥20 µA under worst-case low-temperature, low-supply conditions.
How does the LM285DRG4-2-5 differ from the LM385-2.5 in terms of voltage tolerance?
The LM285DRG4-2-5 has a tighter initial voltage tolerance of ±1.5% (2.462 V to 2.538 V at 25°C), matching the LM385B-2.5, whereas the standard LM385-2.5 offers ±3% (2.425 V to 2.575 V). This 2× tighter tolerance reduces system-level calibration effort in precision measurement applications without increasing cost or complexity.
Can the LM285DRG4-2-5 be used in negative-voltage reference configurations?
Yes-the LM285DRG4-2-5 implements a floating shunt topology, meaning its anode and cathode terminals have no fixed relationship to ground. By connecting the anode to a negative rail and sourcing current into the cathode, it generates a stable −2.5 V reference relative to that rail, enabling dual-supply op-amp biasing and bipolar ADC reference designs without additional level-shifting circuitry.
LM285DRG4-2-5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM285DRG4-2-5 FAQ
1.How can I place an order for LM285DRG4-2-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285DRG4-2-5 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 LM285DRG4-2-5 reliable?
The price and inventory of LM285DRG4-2-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM285DRG4-2-5 is usually 5 days.
3.What payment methods are accepted for LM285DRG4-2-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285DRG4-2-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285DRG4-2-5?
LM285DRG4-2-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285DRG4-2-5 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 LM285DRG4-2-5?
For technical support, including LM285DRG4-2-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285DRG4-2-5 requirements.
6.How does Aetrix verify that LM285DRG4-2-5 is sourced from the original manufacturer or authorized distributors?
All LM285DRG4-2-5 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 LM285DRG4-2-5 meets industry standards.
7.What is the process for return or replacement of LM285DRG4-2-5?
All LM285DRG4-2-5 units undergo pre-shipment inspection (PSI). If there is an issue with LM285DRG4-2-5, 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 LM285DRG4-2-5 part is unused and in its original packaging.
Return procedure for LM285DRG4-2-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM285DRG4-2-5 Tags
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TL431AIDBZR
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