My Inquiry
My Account
onsemi FAN1086D285X
- Part No.:
- FAN1086D285X
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
FAN1086D285X.pdf
- Description:
- IC REG LINEAR 2.85V 1.5A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:1,513
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
FAN1086D285X from Fairchild Semiconductor is a fixed-output 2.85 V, 1.5 A low-dropout linear regulator in TO-252 package, optimized for active SCSI terminators and motherboard clock supplies with 1.5 V dropout at full load and 0.05% typical load regulation.
For engineers reviewing the FAN1086D285X datasheet, pinout, applications, or equivalent options, key selection factors include its fixed 2.85 V output, thermal shutdown at 155 °C, SOT-223/TO-252/TO-263 package options, and guaranteed current limit of 1.6–2.0 A under defined conditions.
Technical Context
The FAN1086D285X implements an NPN-based LDO architecture where quiescent current flows into the load-unlike PNP regulators-improving efficiency. It uses internal bandgap reference (1.25 V ±2%) and trimmed current limiting to ensure stable 2.85 V output across 4.35–7 V input range.
Thermal protection includes junction-sensing shutdown at 155 °C with 10 °C hysteresis and case-to-ambient thermal resistance of 50 °C/W (TO-252, 0.5 in² copper). Ripple rejection is 60–72 dB at 120 Hz with 22 µF tantalum output capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.85 V ±2%, specified for 4.35 V ≤ VIN ≤ 7 V input range |
| Max Output Current | 1.5 A continuous, with current limit trimmed to 1.6–2.0 A |
| Dropout Voltage | 1.5 V max at 1.5 A load, enabling operation with only 4.35 V input |
| Load Regulation | 0.05% typical (10 mA–1 A), critical for stable SCSI termination voltage |
| Ripple Rejection | 72 dB typical at 120 Hz, ensuring clean power for clock supplies |
| Thermal Shutdown | Activates at 155 °C junction temperature with 10 °C hysteresis |
| Quiescent Current | 4–13 mA, fully delivered to load-not wasted as bias current |
Pinout & Package
Package: 3-lead TO-252 (DPAK), with exposed thermal pad connected to VOUT (pin 2) for enhanced heat dissipation. Thermal resistance: ΘJA = 50 °C/W (with 0.5 in² copper), ΘJC = 3 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input supply connection | Accepts 4.35–7 V DC; must be decoupled with ≥10 µF capacitor |
| 2 (VOUT) | Regulated output and thermal pad | Delivers fixed 2.85 V; thermal pad must be soldered to PCB ground plane for thermal performance |
| 3 (GND) | Ground reference | Return path for load and internal circuitry; low-impedance layout required |
Key Features
| Feature | Design Value |
|---|---|
| NPN-based LDO architecture | Quiescent current flows into load-no wasted bias current, improving efficiency over PNP regulators |
| Trimmed current limit | Guarantees 1.6–2.0 A short-circuit current while maintaining 1.5 A rated output |
| On-chip thermal limiting | Shuts down at 155 °C junction temperature with 10 °C hysteresis to prevent permanent damage |
| Low dropout at full load | 1.5 V max dropout enables use with 4.35 V input-critical for 5 V to 2.85 V conversion |
| Stable with ceramic or tantalum capacitors | Validated for 22 µF tantalum output cap; stability region defined vs. ESR per Figure 11 |
Applications
| Active SCSI Terminators | Motherboard Clock Supplies |
|---|---|
Use Scenario: Termination of differential SCSI-2/SCSI-3 bus lines requiring precise 2.85 V bias voltage. IC Role / Device Role / Timing Role: Fixed-voltage current source providing termination voltage referenced to bus differential signals. Use Value: Matches SCSI specification's 2.85 V requirement with 0.05% load regulation, minimizing signal reflection and timing skew. | Use Scenario: Clean, low-noise power delivery to clock generators and PLLs on server/desktop motherboards. IC Role / Device Role / Timing Role: Post-regulator supplying stable 2.85 V to clock ICs sensitive to supply ripple and thermal drift. Use Value: 72 dB ripple rejection at 120 Hz and 0.5% temperature stability ensure jitter-free clock distribution. |
| Battery Chargers | Post Regulators for Switching Supplies |
Use Scenario: Intermediate voltage regulation stage in multi-cell Li-ion charger IC feedback loops. IC Role / Device Role / Timing Role: Precision reference voltage source for charge voltage control circuitry. Use Value: 1.25 V bandgap reference (±2%) and <0.02%/W thermal regulation enable accurate battery voltage sensing. | Use Scenario: Final-stage regulation after buck converter to reduce switching noise in mixed-signal subsystems. IC Role / Device Role / Timing Role: Low-noise linear post-regulator cleaning up switched-mode output. Use Value: 1.5 V dropout allows tight input–output margin; RMS output noise <0.003% of VOUT preserves analog signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV1117-285CDR | 1 A max output, 1.2 V dropout at 1 A, SO-8 package, no thermal pad | Limited to lower-current applications; lacks TO-252 thermal performance for sustained 1.5 A loads | Select when board space permits SO-8 and thermal load is ≤1 A |
| LD1086DT285TR | 1.5 A output, 1.5 V dropout, TO-252 package, but 1.22 V reference (±1%) and no adjustable version | Same footprint and current rating, but tighter reference tolerance and different thermal shutdown threshold (160 °C) | Choose for improved reference accuracy where 160 °C shutdown is acceptable |
Compared with TLV1117-285CDR and LD1086DT285TR, the FAN1086D285X delivers higher current with identical TO-252 thermal design, unique quiescent current delivery to load, and application-specific validation for SCSI termination-making it optimal for high-reliability 2.85 V systems demanding 1.5 A.
Availability
FAN1086D285X is available at Aetrix Electronics and suitable for active SCSI terminators, motherboard clock supplies, and battery chargers requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for FAN1086D285X 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
Fairchild Semiconductor was a U.S.-based analog and power IC manufacturer, acquired by ON Semiconductor in 2016; known for high-performance discrete and linear power solutions.
The FAN1086 series was designed specifically for low-voltage, high-current linear regulation in computing and storage systems-emphasizing transient response, minimal dropout, and SCSI-compliant 2.85 V output.
FAQ
What is the input voltage range for the FAN1086D285X?
The FAN1086D285X operates with an input voltage range of 4.35 V to 7 V, as specified for the 2.85 V fixed-output variant. This ensures proper regulation and dropout margin-applying less than 4.35 V may cause output collapse, while exceeding 7 V risks absolute maximum rating violation.
Does the FAN1086D285X require an external capacitor on the ADJ pin?
No-the FAN1086D285X is a fixed-output variant and does not expose an ADJ pin; it uses internal resistor networks to set 2.85 V. Only the adjustable FAN1086 (non-suffixed) requires external R1/R2 on the ADJ pin. The FAN1086D285X has only IN, VOUT, and GND terminals.
What is the thermal resistance of the FAN1086D285X in TO-252 package?
The FAN1086D285X in TO-252 package has ΘJC = 3 °C/W (junction-to-case) and ΘJA = 50 °C/W (junction-to-ambient) when mounted on 0.5 in² copper area. Performance improves with larger copper pours or heatsinking attached to the exposed VOUT pad.
Is the FAN1086D285X suitable for automotive applications?
The FAN1086D285X is not AEC-Q100 qualified and specifies an operating junction temperature range of 0–125 °C-not extended automotive grade (−40–150 °C). Its use in automotive systems requires additional qualification per application requirements and thermal derating analysis.
How does the FAN1086D285X handle short-circuit conditions?
The FAN1086D285X limits short-circuit current to 1.6–2.0 A via trimmed internal circuitry and activates thermal shutdown at 155 °C junction temperature with 10 °C hysteresis. This dual protection prevents damage during sustained overload while allowing safe restart after cooldown.
FAN1086D285X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 7.5V
- Voltage - Output (Min/Fixed):
- 2.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.5V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 72dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 25°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-252AA
FAN1086D285X FAQ
1.How can I place an order for FAN1086D285X through Aetrix?
Please submit a Request for Quotation (RFQ) for FAN1086D285X 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 FAN1086D285X reliable?
The price and inventory of FAN1086D285X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for FAN1086D285X is usually 5 days.
3.What payment methods are accepted for FAN1086D285X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for FAN1086D285X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for FAN1086D285X?
FAN1086D285X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your FAN1086D285X 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 FAN1086D285X?
For technical support, including FAN1086D285X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your FAN1086D285X requirements.
6.How does Aetrix verify that FAN1086D285X is sourced from the original manufacturer or authorized distributors?
All FAN1086D285X 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 FAN1086D285X meets industry standards.
7.What is the process for return or replacement of FAN1086D285X?
All FAN1086D285X units undergo pre-shipment inspection (PSI). If there is an issue with FAN1086D285X, 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 FAN1086D285X part is unused and in its original packaging.
Return procedure for FAN1086D285X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
FAN1086D285X Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
