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Texas Instruments LM285DG4-2-5
- Part No.:
- LM285DG4-2-5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285DG4-2-5.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,963
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Product details
Overview
LM285DG4-2-5 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, 2.462–2.538 V initial tolerance at 25°C, and reference impedance ≤1.5 Ω over full temperature range. It operates across 20 μA to 20 mA cathode current and supports industrial temperature range (−40°C to +85°C), enabling use in portable battery-powered meters and precision analog front-ends.
For engineers reviewing the LM285DG4-2-5 datasheet, LM285DG4-2-5 pinout, LM285DG4-2-5 application, or LM285DG4-2-5 equivalent, key selection criteria include its low 120 µV broadband noise (10 Hz–10 kHz), long-term stability of ±20 ppm/khr, tolerance to capacitive loading, and compatibility with both positive and negative regulation topologies.
Technical Context
The LM285DG4-2-5 implements a floating shunt architecture using a band-gap core with high-gain amplifier and internal frequency compensation, ensuring stable regulation under all capacitive loads without external components. Its design eliminates need for series pass transistors or external bias networks.
It functions exclusively as a fixed 2.5 V reference with no adjustability; regulation initiates only when cathode current exceeds IZ(MIN) = 8–20 µA, and it maintains specified performance up to 30 mA absolute maximum reverse current. The device exhibits low dynamic impedance (0.2–0.6 Ω typical at 100 µA, 25°C) and minimal voltage drift versus current (≤1 mV from 20 µA to 1 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.462–2.538 V at 25°C; ensures ±1.5% initial accuracy for precision calibration circuits. |
| Tempco | ±20 ppm/°C over −40°C to +85°C; enables stable operation in unregulated industrial environments. |
| Cathode Current Range | 20 μA to 20 mA; supports ultra-low-power sensor nodes and high-current reference buffering. |
| Reference Impedance | ≤1.5 Ω over full temperature range; minimizes load-induced voltage error in varying-current applications. |
| Broadband Noise | 120 µV RMS (10 Hz–10 kHz); preserves signal integrity in high-resolution ADC references. |
| Long-Term Stability | ±20 ppm/khr at 100 µA; reduces recalibration frequency in field-deployed instrumentation. |
| Min Cathode Current | 8–20 µA; defines lowest operating point for reliable startup in energy-harvesting systems. |
Pinout & Package
LM285DG4-2-5 uses an 8-pin SOIC (D) package measuring 4.90 mm × 3.90 mm with 1.75 mm max height. Pin 1 is marked by a beveled corner; pins 2–3 and 5–7 are NC (no internal connection). Anode connects to system ground; cathode sources reference current into the circuit.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ANODE (Pin 4) | Common terminal | Typically connected to ground; establishes reference potential for shunt operation. |
| CATHODE (Pin 8) | Shunt current/voltage input | Sinks regulated current; voltage develops between cathode and anode to maintain 2.5 V. |
| Pins 1, 2, 3, 5, 6, 7 | No internal connection | Electrically isolated; must remain unconnected or tied to ground per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Floating shunt topology | Enables use in both high-side and low-side configurations without level-shifting circuitry. |
| Capacitive-load immunity | Internal frequency compensation allows direct connection to ≥0.1 µF ceramic bypass capacitors without oscillation. |
| Micropower operation | 20 μA minimum operating current extends battery life in portable instruments beyond shelf-life limits. |
| Low-noise band-gap core | 120 µV RMS noise floor supports 16-bit+ ADC accuracy without external filtering. |
| On-chip trimmed tolerance | 1.5% initial voltage accuracy eliminates need for post-assembly calibration in cost-sensitive designs. |
Applications
| Portable Meter References | Current-Loop Instrumentation |
|---|---|
Use Scenario: Handheld multimeters and clamp meters requiring stable, battery-operated voltage references for ADC scaling and offset correction. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing 2.5 V reference node referenced to system ground. Use Value: Enables >4½-digit resolution with <±0.01% linearity error over −10°C to +50°C ambient. |
Use Scenario: 4–20 mA transmitter modules where reference voltage sets loop current via precision resistor. IC Role / Device Role / Timing Role: Fixed-voltage source establishing exact current-sense threshold for op-amp feedback path. Use Value: Maintains loop accuracy within ±0.1% over full industrial temperature range without thermal drift compensation. |
| Thermocouple Cold-Junction Compensation | Battery-Operated Sensor Nodes |
Use Scenario: Precision temperature measurement systems using Type K thermocouples with cold-junction sensing. IC Role / Device Role / Timing Role: Reference voltage source for RTD or thermistor biasing and ADC reference in compensation circuitry. Use Value: Delivers ±0.1°C cold-junction accuracy due to low tempco and negligible self-heating at 100 µA bias. |
Use Scenario: Wireless environmental sensors powered by coin-cell batteries with multi-year operational life. IC Role / Device Role / Timing Role: Ultra-low-quiescent shunt reference for analog signal conditioning prior to MCU ADC sampling. Use Value: Draws only 20 µA, reducing total system standby current to <100 µA and extending battery life to >5 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385LP-2-5 | TO-92 package; 0°C to +70°C temp range; 2.425–2.575 V tolerance (±3%). | Lower-cost option for commercial-grade portable test equipment with relaxed accuracy requirements. | Select when board space permits TO-92 and ambient temperature stays within 0–70°C. |
| REF3025AIDBZR | SOT-23 package; 2.495–2.505 V tolerance (±0.2%); 50 ppm/°C tempco; 50 µA min current. | Higher-accuracy alternative for medical or industrial data acquisition requiring tighter initial tolerance. | Choose when ±0.2% initial accuracy and lower noise (45 µV) outweigh higher quiescent current and cost. |
Compared with LM385LP-2-5, LM285DG4-2-5 offers wider temperature range and tighter tolerance; compared with REF3025AIDBZR, it trades higher initial accuracy for lower power and broader current range-making it optimal for long-life battery systems where moderate precision suffices.
Availability
LM285DG4-2-5 is available at Aetrix Electronics and suitable for portable meter references, current-loop instrumentation, thermocouple cold-junction compensation, and battery-operated sensor nodes requiring stable component supply across extended temperature ranges and multi-year deployment cycles.
Supply support for LM285DG4-2-5 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 industrial-grade components.
The LM285 series belongs to TI's micropower voltage reference product line, designed specifically for battery-powered instrumentation, portable test gear, and low-power analog signal chains demanding long-term stability and wide operating current range.
FAQ
What is the operating temperature range of the LM285DG4-2-5?
The LM285DG4-2-5 is rated for operation from −40°C to +85°C, making it suitable for industrial and automotive-adjacent applications where ambient conditions exceed commercial-grade limits. This extended range is confirmed in the Electrical Characteristics table under Recommended Operating Conditions and distinguishes it from the LM385-2.5 (0°C to +70°C) and LM385B-2.5 (0°C to +70°C) variants. The LM285DG4-2-5 maintains its ±20 ppm/°C tempco and 2.462–2.538 V output tolerance across this full range.
Does the LM285DG4-2-5 require external capacitors for stability?
No, the LM285DG4-2-5 does not require external capacitors for stability due to its internally compensated floating shunt architecture. The datasheet explicitly states that internal frequency compensation provides a stable loop for all capacitive loads, and layout guidelines treat a 0.1 µF ceramic capacitor on the cathode as optional-not mandatory-for noise reduction. This eliminates risk of oscillation seen in uncompensated shunt references and simplifies PCB design for space-constrained portable instruments.
What is the minimum cathode current required for regulation in the LM285DG4-2-5?
The LM285DG4-2-5 requires a minimum cathode current (IZ(MIN)) of 8–20 µA across its operating temperature range to achieve proper regulation. This value is specified in the Electrical Characteristics table and verified in the Recommended Operating Conditions section. Below this threshold, the reference voltage deviates significantly from 2.5 V; above it, regulation is maintained up to 20 mA. Designers must size the series resistor or current source accordingly-e.g., for a 9 V supply, R ≤ (9 V − 2.5 V) ÷ 8 µA ≈ 812 kΩ-to ensure reliable startup.
How does the LM285DG4-2-5 differ from the LM385-2.5 in terms of voltage tolerance?
The LM285DG4-2-5 has a tighter initial voltage tolerance of ±1.5% (2.462–2.538 V) versus ±3% (2.425–2.575 V) for the LM385-2.5, as documented in the Electrical Characteristics tables. Both share identical tempco (±20 ppm/°C) and noise (120 µV), but the LM285DG4-2-5 achieves superior accuracy through on-chip trimming-critical for applications like panel meters and portable calibrators where factory calibration overhead must be minimized. Its −40°C to +85°C rating further differentiates it from the LM385-2.5's 0°C to +70°C limit.
Can the LM285DG4-2-5 be used in negative voltage reference configurations?
Yes, the LM285DG4-2-5 supports negative voltage reference configurations because it is a floating shunt device with no ground-referenced internal nodes. As stated in the Detailed Description section, its "floating shunt design is useful for both positive and negative regulation applications." In practice, this means the anode can be tied to a negative rail (e.g., −5 V) while the cathode connects to circuit ground, producing a −2.5 V reference relative to ground-enabling dual-supply op-amp biasing and bipolar ADC references without additional level-shifting components.
LM285DG4-2-5 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):
- 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
LM285DG4-2-5 FAQ
1.How can I place an order for LM285DG4-2-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285DG4-2-5 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 LM285DG4-2-5 reliable?
The price and inventory of LM285DG4-2-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM285DG4-2-5 is usually 5 days.
3.What payment methods are accepted for LM285DG4-2-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285DG4-2-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285DG4-2-5?
LM285DG4-2-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285DG4-2-5 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 LM285DG4-2-5?
For technical support, including LM285DG4-2-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285DG4-2-5 requirements.
6.How does Aetrix verify that LM285DG4-2-5 is sourced from the original manufacturer or authorized distributors?
All LM285DG4-2-5 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 LM285DG4-2-5 meets industry standards.
7.What is the process for return or replacement of LM285DG4-2-5?
All LM285DG4-2-5 units undergo pre-shipment inspection (PSI). If there is an issue with LM285DG4-2-5, 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 LM285DG4-2-5 part is unused and in its original packaging.
Return procedure for LM285DG4-2-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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