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Texas Instruments LM285D-2-5
- Part No.:
- LM285D-2-5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM285D-2-5.pdf
- Description:
- IC VREF SHUNT 1.5% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,678
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Product details
Overview
LM285D-2-5 from Texas Instruments is a micropower, two-terminal band-gap 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 1.5 Ω max reference impedance over full temperature range. It operates across 20 μA–20 mA cathode current and supports industrial temperature range (−40°C to +85°C), making it suitable for portable meter references and battery-operated analog circuitry.
For engineers reviewing the LM285D-2-5 datasheet, LM285D-2-5 pinout, LM285D-2-5 application, or LM285D-2-5 equivalent, key selection criteria include its shunt topology, low 120 µV broadband noise (10 Hz–10 kHz), tight long-term stability (±20 ppm/khr), and compatibility with capacitive loading-critical for precision instrumentation and low-power sensor signal conditioning.
Technical Context
The LM285D-2-5 implements a floating shunt architecture using a band-gap reference core driving a high-gain amplifier and internal shunt pass element. Regulation requires minimum cathode current (IZ(MIN) = 8–20 µA) to power the internal voltage divider and amplifier.
Internal frequency compensation ensures stable operation with all capacitive loads, eliminating need for external compensation. Its design enables use in both positive and negative regulation configurations, and it maintains regulation under varying supply conditions due to wide dynamic operating current range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.462–2.538 V at 25°C; ensures ±1.5% initial accuracy for calibration-critical analog circuits |
| Tempco | ±20 ppm/°C over −40°C to +85°C; enables stable reference performance across industrial environments |
| Cathode Current Range | 20 μA to 20 mA; supports ultra-low-power portable systems and higher-current regulator biasing |
| Reference Impedance | ≤1.5 Ω over full temperature range; minimizes load-induced voltage shift in precision feedback networks |
| Broadband Noise | 120 µV RMS (10 Hz–10 kHz); preserves signal integrity in high-resolution ADC reference and sensor front-end applications |
| Long-Term Drift | ±20 ppm/khr at 100 µA; guarantees multi-year stability without recalibration in field-deployed equipment |
| Min Cathode Current | 8–20 µA; defines lowest operating point for reliable regulation in energy-constrained designs |
Pinout & Package
LM285D-2-5 is housed in an 8-pin SOIC (D) package (4.90 mm × 3.90 mm body size, 1.75 mm max height), with pins 1–3, 5–7 internally unconnected (NC). Only ANODE (Pin 4) and CATHODE (Pin 8) are functional terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ANODE (Pin 4) | Common terminal | Typically connected to system ground; serves as return path for cathode current and reference potential reference |
| CATHODE (Pin 8) | Shunt current/voltage input | Current must be sourced into this pin to establish 2.5 V across ANODE–CATHODE; functions as regulated voltage output node |
| Pins 1, 2, 3, 5, 6, 7 | No internal connection | Unused; must remain unconnected or tied to ground per layout guidelines to avoid parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Floating shunt topology | Enables bidirectional use-supports both positive and negative regulation without polarity constraints |
| Capacitive-load tolerance | Stable with any value of bypass capacitor on cathode; eliminates need for external compensation components |
| Micropower operation | 20 μA minimum operating current extends battery life in portable meters and handheld test instruments |
| Low dynamic impedance | ≤1.5 Ω over full temperature range reduces output voltage variation under changing load conditions |
| Band-gap core with trimming | On-chip laser trimming achieves tight initial voltage tolerance and long-term drift control |
Applications
| Portable Meter References | Current-Loop Instrumentation |
|---|---|
|
Use Scenario: High-accuracy digital multimeters and handheld calibrators requiring stable, low-drift reference voltage for ADC conversion. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing 2.5 V reference node referenced to system ground. Use Value: ±20 ppm/°C tempco and ±1.5% initial tolerance ensure measurement repeatability across environmental shifts without recalibration. |
Use Scenario: 4–20 mA transmitter modules where reference voltage sets loop current scaling and zero/span points. IC Role / Device Role / Timing Role: Precision shunt reference establishing fixed voltage drop across sense resistor to define loop current. Use Value: Low 120 µV broadband noise prevents current ripple, while 20 μA–20 mA operating range accommodates varied supply headroom. |
| Battery-Operated Systems | Panel Meters |
|
Use Scenario: Long-life battery-powered data loggers and remote sensors needing minimal quiescent current to maximize shelf life. IC Role / Device Role / Timing Role: Micropower voltage reference supplying stable bias to op-amps, comparators, and ADCs. Use Value: 20 μA minimum cathode current allows operation directly from coin cells or primary batteries for years without replacement. |
Use Scenario: Industrial panel-mounted meters used in factory automation and process control with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary voltage reference for analog-to-digital conversion and display driver circuitry. Use Value: −40°C to +85°C operating range and ±20 ppm/°C tempco maintain reading accuracy across uncontrolled cabinet environments. |
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; same 2.5 V reference but rated for 0°C to +70°C only; 3% initial tolerance vs. LM285D-2-5's 1.5% | Suitable for commercial-grade portable instruments; lacks extended temperature support for industrial deployment | Select when cost-sensitive, space-constrained designs prioritize TO-92 footprint and relaxed temp range |
| REF3025AIDBZR | 3-pin SOT-23 series reference; 2.5 V output, ±0.2% initial accuracy, 50 ppm/°C tempco, 50 µA typical quiescent current | Requires separate supply and ground pins; not a direct shunt replacement; better accuracy but higher power and different topology | Choose for higher-precision applications where board space permits 3-pin layout and tighter initial tolerance is mandatory |
Compared with LM385LP-2-5, LM285D-2-5 offers wider temperature range and tighter initial tolerance; compared with REF3025AIDBZR, it uses simpler two-terminal shunt configuration but trades off absolute accuracy and requires external current source design.
Availability
LM285D-2-5 is available at Aetrix Electronics and suitable for portable meter references, current-loop instrumentation, and battery-operated systems requiring stable component supply with verified industrial temperature performance.
Supply support for LM285D-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 decades of leadership in precision analog ICs and voltage references.
The LM285D-2-5 belongs to TI's micropower shunt voltage reference product line, designed specifically for low-power, high-stability applications in portable instrumentation, industrial sensing, and battery-powered measurement systems.
FAQ
What is the operating temperature range of the LM285D-2-5?
The LM285D-2-5 is specified for operation from −40°C to +85°C, making it suitable for industrial environments where ambient temperatures fluctuate widely. This extended range distinguishes it from the LM385-2.5 (0°C to +70°C) and supports reliable performance in outdoor or uncontrolled cabinet installations. The LM285D-2-5 maintains its ±20 ppm/°C temperature coefficient across this full range.
How does the LM285D-2-5 differ from the LM385-2.5 in terms of specifications?
The LM285D-2-5 features tighter initial voltage tolerance (±1.5% vs. ±3% for standard LM385-2.5), identical ±20 ppm/°C temperature coefficient, and extended −40°C to +85°C operating range versus 0°C to +70°C for LM385-2.5. Both share the same 20 μA–20 mA cathode current range and 1.5 Ω max reference impedance. The LM285D-2-5 is the industrial-grade variant within the same family.
Can the LM285D-2-5 be used as a series voltage reference?
No-the LM285D-2-5 is strictly a two-terminal shunt voltage reference and cannot function as a series reference. It requires an external current source connected between supply and CATHODE, with ANODE tied to ground (or common reference point). Attempting series configuration violates its internal topology and will prevent proper regulation. The LM285D-2-5 must always operate with current flowing into the CATHODE terminal.
What is the minimum cathode current required for regulation in the LM285D-2-5?
The LM285D-2-5 requires a minimum cathode current (IZ(MIN)) of 8–20 µA depending on temperature and unit variation, as specified in its Electrical Characteristics table. Below this threshold, regulation fails and output voltage drops below 2.5 V. For robust design, engineers should target ≥20 µA across the full temperature range, typically achieved using a resistor or current source sized per (VSUPPLY − 2.5 V)/20 µA.
Is the LM285D-2-5 still in active production?
No-TI lists LM285D-2-5 as "Obsolete" in its official packaging addendum, though it remains available through authorized distributors and Aetrix Electronics' legacy inventory. For new designs, TI recommends migration to active alternatives such as LM385LP-2-5 (TO-92) or REF3025AIDBZR (SOT-23), depending on topology and accuracy requirements. LM285D-2-5 continues to be supported for existing production with full datasheet compliance.
LM285D-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
LM285D-2-5 FAQ
1.How can I place an order for LM285D-2-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285D-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 LM285D-2-5 reliable?
The price and inventory of LM285D-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 LM285D-2-5 is usually 5 days.
3.What payment methods are accepted for LM285D-2-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285D-2-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285D-2-5?
LM285D-2-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285D-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 LM285D-2-5?
For technical support, including LM285D-2-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285D-2-5 requirements.
6.How does Aetrix verify that LM285D-2-5 is sourced from the original manufacturer or authorized distributors?
All LM285D-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 LM285D-2-5 meets industry standards.
7.What is the process for return or replacement of LM285D-2-5?
All LM285D-2-5 units undergo pre-shipment inspection (PSI). If there is an issue with LM285D-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 LM285D-2-5 part is unused and in its original packaging.
Return procedure for LM285D-2-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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