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onsemi NCP1117DT285G
- Part No.:
- NCP1117DT285G
- Manufacturer:
- onsemi
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
NCP1117DT285G.pdf
- Description:
- IC REG LINEAR 2.85V 1A DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:4,483
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Product details
Overview
NCP1117DT285G from onsemi is a 2.85 V fixed-output, 1.0 A low-dropout linear voltage regulator in DPAK package, featuring 1.2 V max dropout at 800 mA, ±1.0% output voltage accuracy, and thermal shutdown protection. It delivers stable regulation for active SCSI termination, hard drive controllers, and switching power supply post-regulation without minimum load requirement.
For engineers reviewing the NCP1117DT285G datasheet, pinout, applications, or equivalent options, key selection criteria include dropout voltage at 800 mA, thermal performance with PCB copper heatsinking, ripple rejection at 120 Hz, load regulation under 800 mA, and compatibility with 10 µF ceramic output capacitance.
Technical Context
The NCP1117DT285G implements a monolithic PNP pass transistor architecture with internal bandgap reference trimmed to ±1.0%, enabling precise 2.85 V output across temperature. Its safe operating area (SOA) compensation prevents secondary breakdown during transient overloads.
Thermal shutdown activates at ~175°C junction temperature, and current limiting restricts output to ≥1000 mA typical under Vin–Vout = 5.0 V. The device operates with input voltages up to 20 V and requires no minimum load for regulation stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.85 V ±1.0% (guaranteed regulation from 4.25 V to 10 V input, 0–800 mA load) |
| Max Dropout Voltage | 1.20 V at 800 mA (enables operation with only 4.05 V input at full load) |
| Output Current | 1000 mA min (internally limited; derates above 12 V input per datasheet Note 3) |
| Ripple Rejection | 62 dB at 120 Hz (measured with Vin−Vout = 6.4 V, Iout = 500 mA, 10 Vpp sine) |
| Line Regulation | 0.8 mV (max change over Vin = 4.25–10 V, Iout = 0 mA) |
| Load Regulation | 3.8 mV (max change over Iout = 0–800 mA, Vin = 4.25 V) |
| Quiescent Current | 5.5 mA (at Vin = 10 V, TA = 25°C; enables low-noise, high-efficiency light-load operation) |
Pinout & Package
Package: DPAK (Case 369C), surface-mount, exposed metal tab thermally connected to Pin 2 (Output). Requires minimum 2.0 oz copper pad for thermal management per Figure 22.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Ground / Adjust | Reference node for internal error amplifier; tied directly to system ground for fixed-output operation |
| 2 | Output | Main regulated 2.85 V output; electrically and thermally connected to exposed heatsink tab |
| 3 | Input | Unregulated DC input (up to 20 V); requires 10 µF bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| No minimum load requirement | Maintains regulation down to 0 mA output - eliminates need for dummy load resistors in low-power standby modes |
| Thermal shutdown with hysteresis | Activates at ~175°C junction temp and resets after cooling - prevents catastrophic failure during sustained overload or poor heatsinking |
| Internal SOA compensation | Prevents secondary breakdown of PNP pass element during fast load transients or short-circuit events |
| Pb-free DPAK package | RoHS-compliant construction with exposed copper tab optimized for PCB thermal conduction (RJC = 6.0°C/W) |
| Fixed 2.85 V output | Specifically designed for active SCSI bus termination per ANSI X3.131-1994 - eliminates external resistor network and associated tolerance stack-up |
Applications
| Active SCSI Bus Termination | Hard Drive Controller Power |
|---|---|
Use Scenario: Terminating differential SCSI-2/SCSI-3 parallel bus lines to prevent signal reflections and ensure signal integrity at 10–20 MB/s data rates. IC Role / Device Role / Timing Role: Provides precisely 2.85 V bias to 110 Ω termination resistors per SCSI specification, replacing discrete Zener + resistor solutions. Use Value: Eliminates 1.5% output tolerance drift vs. Zener-based designs, ensuring stable bus voltage across temperature and improving noise margin by >200 mV. | Use Scenario: Supplying clean, low-noise 2.85 V power to ASICs and interface logic in 2.5″/3.5″ SATA and PATA hard disk drives. IC Role / Device Role / Timing Role: Post-regulator for switched-mode power supply outputs, rejecting switching noise and maintaining tight voltage control during rapid head actuation currents. Use Value: 62 dB ripple rejection at 120 Hz suppresses residual AC line harmonics; 3.8 mV load regulation ensures stable logic levels during 0–800 mA burst currents. |
| Switching Power Supply Post-Regulation | Battery Charger Reference Supply |
Use Scenario: Final-stage regulation after a 5 V or 12 V buck converter powering sensitive analog circuitry (e.g., ADC references, sensor front-ends). IC Role / Device Role / Timing Role: Low-noise LDO providing ultra-stable 2.85 V rail decoupled from switching ripple and EMI. Use Value: RMS output noise of 0.003% Vout (≈81 µV) enables <16-bit ADC accuracy; 1.2 V dropout allows use with 4.05 V input from 5 V buck stage. | Use Scenario: Generating precision 2.85 V reference for charge controller ICs (e.g., MAX1733, BQ2407x) in Li-ion battery charging circuits. IC Role / Device Role / Timing Role: Stable voltage reference source for current-sense amplifier bias and voltage feedback divider networks. Use Value: ±1.0% initial accuracy and 0.5% temperature stability ensure ±15 mV reference error over −40°C to +125°C, directly improving charge voltage accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV1117-285CDR | 2.85 V output, SOT-223 only; 1.2 V dropout at 800 mA; ±2% accuracy; no automotive qualification | Lacks DPAK thermal performance; lower accuracy impacts SCSI termination margin | Select when board space constraints favor SOT-223 and thermal load is ≤0.8 W |
| LD1117S285TR | 2.85 V output, SOT-223 only; 1.3 V dropout at 800 mA; ±2% accuracy; no thermal shutdown hysteresis | Higher dropout reduces usable input range; missing thermal hysteresis risks oscillation under marginal heatsinking | Select for cost-sensitive consumer applications where 125°C ambient limit suffices and PCB copper area is limited |
Compared with TLV1117-285CDR and LD1117S285TR, the NCP1117DT285G offers superior thermal robustness via DPAK's 6.0°C/W RJC, tighter ±1.0% output accuracy critical for SCSI compliance, and reliable thermal shutdown hysteresis - making it the preferred choice for industrial and storage applications demanding long-term stability and fault resilience.
Availability
NCP1117DT285G is available at Aetrix Electronics and suitable for active SCSI termination, hard drive controllers, and switching power supply post-regulation requiring stable component supply, RoHS compliance, and extended temperature support.
Supply support for NCP1117DT285G 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
onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensors, and connectivity solutions for automotive, industrial, cloud, and IoT markets.
The NCP1117 series was engineered for high-reliability point-of-load regulation in storage, computing, and industrial equipment - emphasizing low dropout, ±1.0% accuracy, and robust thermal protection without minimum load dependency.
FAQ
What is the maximum input voltage rating for the NCP1117DT285G?
The NCP1117DT285G supports a maximum input voltage of 20 V, as specified in the Absolute Maximum Ratings table. Operation above this level risks permanent damage. For reliable long-term use, design input voltage to remain ≤20 V under all conditions including line transients and ripple peaks.
Does the NCP1117DT285G require an external output capacitor, and what value is recommended?
Yes, the NCP1117DT285G requires a minimum 4.7 µF output capacitor with ESR between 33 mΩ and 2.2 Ω for stability. A 10 µF ceramic capacitor is recommended and validated in the datasheet for optimal transient response and ripple suppression across temperature.
Is the NCP1117DT285G pin-compatible with older three-terminal regulators like the LM317?
No - the NCP1117DT285G is a fixed-output device with Ground/Adjust (Pin 1), Output (Pin 2), and Input (Pin 3) pinout. While the NCP1117 adjustable variant is pin-compatible with the LM317, the fixed 2.85 V version has different internal topology and cannot substitute for LM317 in adjustable configurations.
What thermal performance can be expected from the NCP1117DT285G in DPAK package?
In DPAK (Case 369C), the NCP1117DT285G achieves RJC = 6.0°C/W and RJA ≈ 67°C/W with minimum-size PCB pad. With 25 mm² of 2 oz copper, RJA drops to ~40°C/W, enabling ~1.2 W continuous dissipation at TA = 50°C before thermal shutdown activates.
Can the NCP1117DT285G be used in automotive applications?
The NCP1117DT285G is not AEC-Q100 qualified. For automotive use, select the NCV1117DT285RKG variant, which carries the NCV prefix, meets AEC-Q100 Grade 1 requirements (−40°C to +125°C), and is PPAP capable - the NCP1117DT285G is intended for industrial and commercial systems.
NCP1117DT285G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 2.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.2V @ 800mA
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 68dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
NCP1117DT285G FAQ
1.How can I place an order for NCP1117DT285G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP1117DT285G 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 NCP1117DT285G reliable?
The price and inventory of NCP1117DT285G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP1117DT285G is usually 5 days.
3.What payment methods are accepted for NCP1117DT285G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP1117DT285G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP1117DT285G?
NCP1117DT285G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP1117DT285G 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 NCP1117DT285G?
For technical support, including NCP1117DT285G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP1117DT285G requirements.
6.How does Aetrix verify that NCP1117DT285G is sourced from the original manufacturer or authorized distributors?
All NCP1117DT285G 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 NCP1117DT285G meets industry standards.
7.What is the process for return or replacement of NCP1117DT285G?
All NCP1117DT285G units undergo pre-shipment inspection (PSI). If there is an issue with NCP1117DT285G, 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 NCP1117DT285G part is unused and in its original packaging.
Return procedure for NCP1117DT285G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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