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Texas Instruments LM285DG4-1-2
- Part No.:
- LM285DG4-1-2
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285DG4-1-2.pdf
- Description:
- IC VREF SHUNT 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:310
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Product details
Overview
LM285DG4-1-2 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 metering, battery-operated analog signal chains, and low-power regulator feedback networks.
For engineers reviewing the LM285DG4-1-2 datasheet, LM285DG4-1-2 pinout, LM285DG4-1-2 application, or LM285DG4-1-2 equivalent, key selection criteria include its 1% initial tolerance, 60 μV broadband noise (10 Hz–10 kHz), capacitive-load tolerance, and SOIC-8 package compatibility with standard surface-mount assembly processes.
Technical Context
The LM285DG4-1-2 implements a floating shunt topology using an internal band-gap reference core with high-gain amplifier and shunt pass element, enabling stable regulation without external components. Its on-chip trimming achieves tight initial voltage accuracy and low long-term drift (±20 ppm/khr).
Designed for operation with minimal quiescent current, it maintains regulation down to 10 μA cathode current and exhibits exceptional stability under capacitive loading-eliminating need for external compensation in most applications. Thermal resistance is 97 °C/W (RθJA) in SOIC-8 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Reference Voltage | 1.235 V at 25°C - precise setpoint for analog calibration and feedback loops |
| Initial Tolerance | ±1% - enables direct use in 12-bit ADC references without trimming |
| Temp Coefficient | ±20 ppm/°C - ensures ≤0.5 mV drift over full –40°C to 85°C range |
| Reference Impedance | 1.5 Ω max over full temp range - minimizes load-induced voltage error |
| Operating Current Range | 10 μA to 20 mA - supports ultra-low-power sleep modes and high-accuracy active operation |
| Broadband Noise | 60 μV RMS (10 Hz–10 kHz) - suitable for precision instrumentation front-ends |
| Long-Term Drift | ±20 ppm/khr - guarantees stability in battery-powered devices over years of field use |
Pinout & Package
LM285DG4-1-2 is housed in an 8-pin SOIC (Package Drawing D, body size 4.90 mm × 3.91 mm), RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating. The device uses only two functional pins; remaining pins are NC.
| 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 | Source of regulated 1.235 V; requires external current source (e.g., resistor or LM334) |
| NC (Pins 3, 4, 5, 6, 7) | No internal connection | Unused; may be left floating or tied to ground per layout best practices |
| NC (Pin 8) | No internal connection | Unused; electrically isolated from die; no routing required |
Key Features
| Feature | Design Value |
|---|---|
| Two-terminal shunt architecture | Eliminates need for dedicated supply rail-ideal for floating or negative-regulation topologies |
| Capacitive-load immunity | Stable with ≥0.1 μF ceramic bypass capacitor directly on cathode-simplifies layout and improves PSRR |
| Micropower operation | Functional down to 10 μA cathode current-enables multi-year battery life in portable meters |
| Low-noise band-gap core | 60 μV RMS noise (10 Hz–10 kHz) - preserves SNR in high-resolution data acquisition systems |
| On-chip trimming | Delivers 1% initial accuracy without external calibration-reduces BOM count and test time |
Applications
| Portable Meter References | Portable Test Instruments |
|---|---|
Use Scenario: Handheld digital multimeters requiring stable, low-drift reference for 3½- to 4½-digit accuracy. IC Role / Device Role / Timing Role: Shunt voltage reference providing 1.235 V基准 for ADC reference input and analog front-end biasing. Use Value: Enables <1 LSB error over temperature due to ±20 ppm/°C drift and 1.5 Ω impedance limiting load-induced error to <15 μV at 10 μA. | Use Scenario: Battery-powered oscilloscope probes and signal generators needing calibrated output levels. IC Role / Device Role / Timing Role: Precision reference for DAC output scaling and analog output stage calibration. Use Value: 60 μV broadband noise ensures clean analog outputs; micropower operation extends runtime between charges. |
| Battery-Operated Systems | Current-Loop Instrumentation |
Use Scenario: Wireless sensor nodes monitoring temperature, pressure, or humidity with multi-year battery life. IC Role / Device Role / Timing Role: Reference for sensor signal conditioning and microcontroller ADC-operating continuously at 15 μA. Use Value: 10 μA minimum current allows continuous operation from coin-cell batteries; long-term drift <0.1 mV/year supports unattended deployment. | Use Scenario: 4–20 mA industrial transmitters where reference stability defines loop accuracy. IC Role / Device Role / Timing Role: Shunt reference setting I-to-V conversion gain in op-amp-based transmitter circuits. Use Value: 1.5 Ω impedance ensures <0.03% gain error even with 20 mA loop current variation; ±1% tolerance eliminates factory trim. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385DG4-1-2 | Wider operating temperature range (0°C to 70°C vs –40°C to 85°C); same electrical specs except IZ(min) = 15 μA | Not rated for extended industrial or automotive ambient conditions | Select LM285DG4-1-2 when operation below 0°C or above 70°C is required |
| LM385BDR-1-2 | Improved 0.5% initial tolerance (vs 1%); otherwise identical SOIC-8 packaging and electrical behavior | Higher accuracy needed for 16-bit ADC references or metrology-grade instruments | Choose LM385BDR-1-2 when tighter initial accuracy justifies cost premium |
Compared with LM385DG4-1-2 and LM385BDR-1-2, the LM285DG4-1-2 uniquely supports –40°C startup and sustained operation while maintaining 1% tolerance and 10 μA minimum current-making it optimal for wide-temperature portable and industrial edge sensors.
Availability
LM285DG4-1-2 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 availability.
Supply support for LM285DG4-1-2 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 the 1960s.
The LMx85-1.2 family was designed specifically for micropower, high-stability shunt voltage references in portable, battery-constrained, and industrial measurement systems-emphasizing low drift, low noise, and ease of use.
FAQ
What is the minimum cathode current required for regulation in the LM285DG4-1-2?
The LM285DG4-1-2 requires a minimum cathode current (IZ(min)) of 10 μA to maintain regulation across its full operating temperature range of –40°C to 85°C. This value is specified in the Electrical Characteristics table and confirmed in Section 7.3 (Recommended Operating Conditions). Below this threshold, output voltage deviates from the nominal 1.235 V and regulation is not guaranteed. The LM285DG4-1-2 remains functional and stable at this ultra-low current, supporting multi-year battery life in always-on portable devices.
Does the LM285DG4-1-2 require an external capacitor for stability?
No, the LM285DG4-1-2 does not require an external capacitor for basic stability-it is internally compensated and tolerant of capacitive loading up to at least 0.1 μF. However, TI recommends placing a 0.1 μF low-ESR ceramic capacitor directly on the cathode pin to reduce broadband noise and improve transient response. This capacitor has no effect on loop stability but enhances performance in precision analog applications. The LM285DG4-1-2's floating shunt design and internal frequency compensation eliminate risk of oscillation even with larger capacitances.
Can the LM285DG4-1-2 be used in negative-voltage reference configurations?
Yes, the LM285DG4-1-2 can be used as a negative-voltage reference because it is a two-terminal shunt device with no ground reference constraint. When the anode is connected to a negative rail and the cathode to a more-positive node (e.g., system ground), it regulates the voltage difference between them at 1.235 V. This configuration is explicitly supported in the Functional Block Diagram and Feature Description sections of the datasheet. The LM285DG4-1-2's floating architecture makes it suitable for both positive and negative regulation topologies without modification.
What is the maximum cathode current rating for the LM285DG4-1-2?
The absolute maximum cathode current for the LM285DG4-1-2 is 30 mA, as specified in Section 7.1 (Absolute Maximum Ratings). Exceeding this value risks permanent damage due to junction overheating. In normal operation, the recommended maximum is 20 mA (per Recommended Operating Conditions), which ensures thermal safety within the SOIC-8 package's 97 °C/W RθJA limit. At 20 mA and 25°C ambient, junction temperature rise is ~194°C-well below the 150°C absolute max-so derating or heatsinking is advised for sustained high-current use.
How does the LM285DG4-1-2 compare to the LM385-1.2 in terms of temperature range?
The LM285DG4-1-2 is rated for operation from –40°C to 85°C, whereas the LM385DG4-1-2 is limited to 0°C to 70°C. This extended industrial temperature range makes the LM285DG4-1-2 suitable for automotive under-hood, outdoor sensor, and wide-ambient industrial applications where sub-zero startup or high-temperature reliability is required. Both share identical electrical specifications-including 1.235 V nominal voltage, 1% initial tolerance, and 10 μA/15 μA minimum current-except for the temperature grading. The LM285DG4-1-2's wider range is achieved through enhanced process characterization and screening.
LM285DG4-1-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- 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
LM285DG4-1-2 FAQ
1.How can I place an order for LM285DG4-1-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285DG4-1-2 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 LM285DG4-1-2 reliable?
The price and inventory of LM285DG4-1-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM285DG4-1-2 is usually 5 days.
3.What payment methods are accepted for LM285DG4-1-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285DG4-1-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285DG4-1-2?
LM285DG4-1-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285DG4-1-2 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 LM285DG4-1-2?
For technical support, including LM285DG4-1-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285DG4-1-2 requirements.
6.How does Aetrix verify that LM285DG4-1-2 is sourced from the original manufacturer or authorized distributors?
All LM285DG4-1-2 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 LM285DG4-1-2 meets industry standards.
7.What is the process for return or replacement of LM285DG4-1-2?
All LM285DG4-1-2 units undergo pre-shipment inspection (PSI). If there is an issue with LM285DG4-1-2, 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 LM285DG4-1-2 part is unused and in its original packaging.
Return procedure for LM285DG4-1-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM285DG4-1-2 Tags
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TL431AIDBZR
Texas Instruments
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Texas Instruments
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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