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Texas Instruments LM285DRE4-1-2
- Part No.:
- LM285DRE4-1-2
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285DRE4-1-2.pdf
- Description:
- IC VREF SHUNT 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,193
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Product details
Overview
LM285DRE4-1-2 from Texas Instruments is a micropower, two-terminal, band-gap voltage reference IC operating over 10 μA to 20 mA cathode current, delivering 1.235 V nominal output with ±20 ppm/°C temperature coefficient and 1.5 Ω max reference impedance across −40°C to 85°C. It serves as a precision shunt reference in portable meters, battery-operated analog front-ends, and low-power current-loop instrumentation.
For engineers reviewing the LM285DRE4-1-2 datasheet, LM285DRE4-1-2 pinout, LM285DRE4-1-2 application, or LM285DRE4-1-2 equivalent, key selection criteria include its 10–20 mA operating current range, 1.235 V reference voltage tolerance (±1.2% at 25°C), low-noise performance (60 μV RMS, 10 Hz–10 kHz), and SOIC-8 package compatibility with standard surface-mount assembly processes.
Technical Context
The LM285DRE4-1-2 implements a floating shunt topology using a band-gap core with on-chip trimming for initial accuracy. Its internal frequency compensation ensures stable regulation under capacitive loads up to 1 μF without external components.
It operates exclusively in fixed-voltage reference mode with no adjustability; regulation requires minimum cathode current of 8 μA (−40°C to 85°C) and exhibits 30 mV max voltage change over full current range (10 μA to 20 mA) and temperature span.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Reference Voltage | 1.235 V - precise shunt voltage setpoint for analog signal conditioning and ADC/DAC biasing |
| Initial Voltage Tolerance | ±1% at 25°C - enables single-point calibration in portable test equipment |
| Operating Current Range | 10 μA to 20 mA - supports ultra-low-power sleep modes and high-accuracy active operation |
| Temperature Coefficient | ±20 ppm/°C - ensures ≤0.5 mV drift over −40°C to 85°C for panel meter stability |
| Reference Impedance | 1.5 Ω max over full temperature range - minimizes load-induced error in precision current-sense circuits |
| Broadband Noise | 60 μV RMS (10 Hz–10 kHz) - suitable for 12-bit+ data acquisition without additional filtering |
| Long-Term Stability | ±20 ppm/khr - maintains calibration integrity in unattended battery-powered monitoring systems |
Pinout & Package
LM285DRE4-1-2 is housed in an 8-pin SOIC (Package Drawing D, 4.90 mm × 3.91 mm body, 1.75 mm max height) with gull-wing leads and RoHS-compliant NiPdAu finish. Pin 1 is marked by a beveled corner or dot; the device uses a two-terminal shunt configuration with unused pins internally disconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Shunt current return path | Connected to system ground or negative rail; completes reference current loop |
| Cathode (Pin 2) | Reference voltage output node | Provides regulated 1.235 V relative to Anode; requires external current source |
| NC (Pins 3, 4, 5, 6, 7) | No internal connection | Unused; may be left floating or tied to ground for mechanical stability only |
| NC (Pin 8) | No internal connection | Unused; electrically isolated - no routing required |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive load tolerance | Stable with ≥1 µF ceramic bypass capacitor - eliminates need for external compensation in portable designs |
| Low dynamic impedance | 1.5 Ω max over full temperature and current range - reduces output error in varying load conditions |
| Micropower operation | 10 µA minimum operating current - extends battery life to shelf-life duration in handheld instruments |
| Band-gap core architecture | Low-noise (60 µV RMS), long-term stable (±20 ppm/khr) reference - meets requirements for Class I portable meters |
| Wide temperature range | −40°C to +85°C operation - qualified for industrial and automotive under-hood sensor interfaces |
Applications
| Portable Meter References | Portable Test Instruments |
|---|---|
Use Scenario: Used in handheld digital multimeters (DMMs) to establish precision 1.235 V reference for ADC conversion of voltage, current, and resistance measurements. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable excitation for ratiometric measurement circuits. Use Value: Enables 0.1% basic accuracy with minimal self-heating and no warm-up drift due to 10 µA–20 mA operational flexibility. | Use Scenario: Integrated into battery-powered oscilloscope probes and signal generators to calibrate internal DACs and attenuators. IC Role / Device Role / Timing Role: Fixed-voltage reference for analog signal chain biasing and offset correction. Use Value: Delivers <1 mV total error over temperature and time, supporting traceable calibration without field recalibration. |
| Battery-Operated Systems | Current-Loop Instrumentation |
Use Scenario: Powers sensor signal conditioning in wireless environmental monitors (temperature/humidity/CO₂) running on coin-cell batteries for >5 years. IC Role / Device Role / Timing Role: Low-quiescent-current shunt reference for op-amp gain-setting and ADC reference in ultra-low-power microcontroller subsystems. Use Value: Draws only 10 µA minimum, enabling multi-year operation while maintaining 12-bit effective resolution. | Use Scenario: Provides stable reference in 4–20 mA transmitter modules for industrial pressure and flow sensors. IC Role / Device Role / Timing Role: Precision voltage node for current-source compliance and loop calibration resistor biasing. Use Value: Maintains loop accuracy within ±0.05% over temperature via ±20 ppm/°C TC and 1.5 Ω impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385DR-1-2 | Same electrical specs but rated for 0°C to 70°C only; 15 µA min operating current | Not suitable for extended industrial temperature environments (−40°C to 85°C) | Select LM285DRE4-1-2 when full industrial temperature range and lower 8 µA min current are required |
| REF3012AIDBZR | 1.2 V output, 50 ppm/°C TC, 3.5 µA quiescent, SOT-23-3 package | Lower power but higher tempco and smaller package - less robust against PCB thermal gradients | Choose REF3012AIDBZR only if board space is constrained and 50 ppm/°C drift is acceptable |
Compared with LM385DR-1-2, LM285DRE4-1-2 offers wider temperature qualification and lower minimum current; versus REF3012AIDBZR, it trades higher quiescent current for superior temperature stability and SOIC-8 handling robustness in automated assembly.
Availability
LM285DRE4-1-2 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 LM285DRE4-1-2 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 since 1951.
LM285DRE4-1-2 belongs to TI's micropower shunt voltage reference product line, designed specifically for battery-constrained, high-accuracy analog measurement systems where long-term stability and low operating current are critical.
FAQ
What is the minimum cathode current required for regulation in LM285DRE4-1-2?
The LM285DRE4-1-2 requires a minimum cathode current of 8 μA across its full operating temperature range of −40°C to 85°C to maintain regulation. This value is specified in the Electrical Characteristics table under "Minimum reference current" and is lower than the 15 μA minimum for LM385 variants, making LM285DRE4-1-2 suitable for ultra-low-power sleep modes in portable devices.
Does LM285DRE4-1-2 require external capacitors for stability?
No, LM285DRE4-1-2 does not require external capacitors for stability due to its internally compensated shunt architecture. The datasheet confirms stable operation with ≥1 μF ceramic bypass capacitor on the cathode node, and no series resistance or isolation components are needed - simplifying layout in space-constrained portable instruments.
What is the temperature coefficient specification for LM285DRE4-1-2?
The LM285DRE4-1-2 has an average temperature coefficient of ±20 ppm/°C over its full operating range (−40°C to 85°C). This means the reference voltage drifts no more than ±0.00247 V across a 100°C span, directly supporting high-accuracy applications like Class I portable meters and industrial sensor transmitters.
Can LM285DRE4-1-2 be used in series with other components to generate higher reference voltages?
No, LM285DRE4-1-2 is a two-terminal shunt reference and cannot be stacked or cascaded to generate higher voltages. It must be used with an external current source and functions only as a 1.235 V node referenced to its anode. For higher reference voltages, discrete resistor-divider networks or dedicated series references like REF5025 should be selected instead.
Is LM285DRE4-1-2 RoHS compliant and lead-free?
Yes, LM285DRE4-1-2 is RoHS compliant and lead-free, with Green (RoHS & no Sb/Br) eco plan and NiPdAu (NIPDAU) lead finish. It meets JEDEC MSL Level-1 rating (260°C peak reflow), and its SOIC-8 package is qualified for standard Pb-free soldering processes without special handling requirements.
LM285DRE4-1-2 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):
- 1.235V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 20ppm/°C Typical
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 60µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 10 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM285DRE4-1-2 FAQ
1.How can I place an order for LM285DRE4-1-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285DRE4-1-2 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 LM285DRE4-1-2 reliable?
The price and inventory of LM285DRE4-1-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM285DRE4-1-2 is usually 5 days.
3.What payment methods are accepted for LM285DRE4-1-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285DRE4-1-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285DRE4-1-2?
LM285DRE4-1-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285DRE4-1-2 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 LM285DRE4-1-2?
For technical support, including LM285DRE4-1-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285DRE4-1-2 requirements.
6.How does Aetrix verify that LM285DRE4-1-2 is sourced from the original manufacturer or authorized distributors?
All LM285DRE4-1-2 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 LM285DRE4-1-2 meets industry standards.
7.What is the process for return or replacement of LM285DRE4-1-2?
All LM285DRE4-1-2 units undergo pre-shipment inspection (PSI). If there is an issue with LM285DRE4-1-2, 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 LM285DRE4-1-2 part is unused and in its original packaging.
Return procedure for LM285DRE4-1-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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