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onsemi NCP4687DH18T1G
- Part No.:
- NCP4687DH18T1G
- Manufacturer:
- onsemi
- Package:
- SOT-89-5/6
- Datasheet:
-
NCP4687DH18T1G.pdf
- Description:
- IC REG LINEAR 1.8V 500MA SOT89-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,507
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Product details
Overview
NCP4687DH18T1G from onsemi is a 500 mA CMOS low-dropout linear voltage regulator with fixed 1.8 V output, ±0.8% accuracy at VOUT > 1.8 V, 75 dB PSRR at 1 kHz, and integrated auto-discharge NMOS for fast output capacitor discharge. It operates from 2.5 V to 5.25 V input and is used in DVB-T/S receivers and car audio systems where high ripple rejection and stable low-voltage biasing are required.
For engineers reviewing the NCP4687DH18T1G datasheet, pinout, applications, or equivalent options, this page delivers verified technical context, package-specific pin functions, real-world load/line transient behavior, thermal shutdown thresholds, and validated alternative LDOs for industrial and portable communication designs.
Technical Context
The NCP4687DH18T1G implements a precision bandgap reference, error amplifier, and resistor divider network to maintain tight output regulation across temperature and load. Its internal current limit (50 mA short-circuit) and thermal shutdown (165°C trip, 100°C hysteresis) provide robust fault protection in unattended equipment.
It features a dedicated SENSE pin for remote voltage sensing-reducing PCB trace resistance impact on load regulation-and an active-high CE pin with internal pull-down (0.3–0.6 µA) ensuring safe default-off operation. The auto-discharge NMOS (RDS(on) ≤ 60 Ω) activates only during disable mode to rapidly deplete output capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V, ±0.8% accuracy over −40°C to +85°C ensures stable core/bias rail for 1.8 V logic and RF front-ends. |
| Max Output Current | 500 mA continuous, enabling single-regulator power for SoC peripherals or multi-rail subsystems. |
| Dropout Voltage | 0.27 V (typ) at 500 mA, allowing operation down to VIN = 2.07 V while maintaining regulation. |
| PSRR | 75 dB at 1 kHz, 70 dB at 10 kHz-rejects switching noise from DC-DC converters feeding its input. |
| Quiescent Current | 80–115 µA at VOUT > 1.5 V, minimizing standby power in always-on automotive modules. |
| Thermal Shutdown | 165°C junction trip with 65°C hysteresis prevents latch-up during sustained overload or poor heatsinking. |
| Enable Threshold | VCEH = 1.0 V min, VCEL = 0.4 V max-compatible with 1.8 V GPIO without level-shifting. |
Pinout & Package
Package: SOT−89−5 (Case 528AB), 4.4 mm × 2.4 mm × 1.5 mm body, exposed pad (EP) for thermal enhancement. Pin 1 = VIN, Pin 2 = GND, Pin 3 = CE, Pin 4 = SENSE, Pin 5 = VOUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Input supply connection | Accepts 2.5–5.25 V; requires 1.0 µF ceramic decoupling placed adjacent to pin for line transient immunity. |
| GND (Pin 2) | Power ground reference | Common return for input/output capacitors and feedback path; must connect directly to EP for thermal performance. |
| CE (Pin 3) | Chip enable control | Active-high logic input; internal 0.3–0.6 µA pull-down guarantees safe off-state if left floating. |
| SENSE (Pin 4) | Remote output voltage sensing | Connects to load-side of PCB trace to compensate for IR drop-improves load regulation to ≤20 mV. |
| VOUT (Pin 5) | Regulated output | Delivers 1.8 V @ up to 500 mA; requires 1.0 µF ceramic output cap placed near pin for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| High PSRR architecture | 75 dB at 1 kHz enables clean 1.8 V supply in noisy environments like car infotainment head units. |
| Auto-discharge NMOS | RDS(on) ≤ 60 Ω discharges output caps in <1 ms during shutdown-critical for fast system reset sequencing. |
| Precision output accuracy | ±0.8% over temperature ensures reliable operation of 1.8 V I/O interfaces without external trimming. |
| Low dropout design | 0.27 V typical dropout at full load allows use with Li-ion battery (3.0–4.2 V) or buck converter outputs. |
| Thermal protection with hysteresis | 165°C trip / 100°C recovery prevents thermal cycling damage during sustained overload in enclosed enclosures. |
Applications
| DVB-T/S Receiver Power | Car Audio DSP Core Supply |
|---|---|
Use Scenario: Powers tuners, demodulators, and MPEG decoders in digital terrestrial/satellite set-top boxes. IC Role / Device Role / Timing Role: Primary 1.8 V LDO for baseband ICs requiring ultra-low noise and high PSRR to prevent data corruption. Use Value: 40 µVrms output noise and 75 dB PSRR suppress switching artifacts from upstream DC-DC converters. |
Use Scenario: Supplies 1.8 V core voltage to digital signal processors in automotive head units and amplifiers. IC Role / Device Role / Timing Role: Regulated bias rail with fast CE-controlled enable/disable for power sequencing during ignition cycles. Use Value: Auto-discharge NMOS clears output caps within 1 ms, meeting automotive reset timing requirements. |
| LCD TV TCON Bias Rail | Industrial PLC I/O Module |
Use Scenario: Provides stable 1.8 V to timing controller (TCON) ICs in LCD display backplanes. IC Role / Device Role / Timing Role: Low-noise, high-accuracy LDO delivering precise reference voltage for gate driver timing circuits. Use Value: ±0.8% output accuracy and ±30 ppm/°C tempco ensure consistent display refresh timing across operating temperature. |
Use Scenario: Powers isolated communication interfaces (RS-485, CAN transceivers) in programmable logic controllers. IC Role / Device Role / Timing Role: Industrial-grade LDO with thermal shutdown and current limiting for harsh ambient conditions. Use Value: 150°C max junction rating and 111°C/W RθJA (SOT-89) support operation in 85°C cabinet environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1826-1802E/DB | Fixed 1.8 V, 500 mA, 250 mV dropout, 65 dB PSRR @ 1 kHz, no SENSE pin | Lacks remote sensing and auto-discharge; lower PSRR reduces noise immunity in RF-sensitive designs | Choose when board space is constrained and remote sensing is unnecessary; verify line regulation meets system tolerance. |
| TLE42744G V33 | Adjustable 1.2–5.0 V, 400 mA, 200 mV dropout, 70 dB PSRR @ 100 Hz, automotive AEC-Q100 qualified | Requires external resistors for 1.8 V setting; higher quiescent current (120 µA); AEC-Q100 Grade 1 rated | Prefer for automotive safety-critical modules needing qualification; accept trade-off in accuracy (±2%) and layout complexity. |
Compared with MCP1826-1802E/DB and TLE42744G V33, the NCP4687DH18T1G delivers superior PSRR, integrated SENSE functionality for improved load regulation, and faster output discharge-making it optimal for high-fidelity audio and broadcast receiver applications where signal integrity is paramount.
Availability
NCP4687DH18T1G is available at Aetrix Electronics and suitable for DVB-T/S receivers, car audio DSP supplies, LCD TV TCON bias rails, and industrial PLC I/O modules requiring stable component supply with guaranteed long-term sourcing.
Supply support for NCP4687DH18T1G 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 supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, and consumer markets.
The NCP4687DH18T1G belongs to onsemi's high-PSRR LDO family designed for noise-sensitive applications including digital broadcast receivers, automotive infotainment, and industrial control systems demanding precision regulation and fast transient response.
FAQ
What is the maximum input voltage rating for the NCP4687DH18T1G?
The NCP4687DH18T1G has an absolute maximum input voltage of 6 V. Operation above this level risks permanent damage. Its recommended operating range is 2.5 V to 5.25 V, which ensures proper regulation and thermal performance under all load conditions. Exceeding 5.25 V may degrade PSRR and increase dropout voltage unpredictably.
Does the NCP4687DH18T1G require external components for stable operation?
Yes-the NCP4687DH18T1G requires two 1.0 µF ceramic capacitors: one between VIN and GND (input decoupling), and one between VOUT and GND (output decoupling). These must be placed as close as possible to their respective pins. Using tantalum capacitors is discouraged due to ESR-related instability risks confirmed in the datasheet.
How does the SENSE pin improve regulation in the NCP4687DH18T1G?
The SENSE pin on the NCP4687DH18T1G enables remote voltage sensing at the load, compensating for voltage drop across PCB traces. When connected directly to the load's 1.8 V rail, it reduces load regulation error from up to 20 mV (standard configuration) to <5 mV-even under full 500 mA load-ensuring accurate voltage delivery to sensitive downstream ICs.
What happens to the output when the CE pin is pulled low on the NCP4687DH18T1G?
When the CE pin is pulled low (<0.4 V), the NCP4687DH18T1G disables its pass transistor and activates the internal auto-discharge NMOS between VOUT and GND. This discharges the output capacitor through ≤60 Ω resistance, reducing VOUT to <100 mV within 1 ms-enabling rapid system reset and preventing back-powering of upstream circuitry.
Is the NCP4687DH18T1G RoHS compliant and lead-free?
Yes-the NCP4687DH18T1G is Pb-free and RoHS compliant, as explicitly stated in the datasheet's Features section and confirmed in the Ordering Information table. The "G" suffix in the part number denotes compliance, and the device uses matte tin lead finish per J-STD-020 moisture sensitivity level 1 handling requirements.
NCP4687DH18T1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- SOT-89-5/6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.25V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.41V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 115 µA
- Current - Supply (Max):
- -
- PSRR:
- 75dB ~ 70dB (1kHz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-5
NCP4687DH18T1G FAQ
1.How can I place an order for NCP4687DH18T1G through Aetrix?
Please submit a Request for Quotation (RFQ) for NCP4687DH18T1G 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 NCP4687DH18T1G reliable?
The price and inventory of NCP4687DH18T1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCP4687DH18T1G is usually 5 days.
3.What payment methods are accepted for NCP4687DH18T1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCP4687DH18T1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCP4687DH18T1G?
NCP4687DH18T1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCP4687DH18T1G 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 NCP4687DH18T1G?
For technical support, including NCP4687DH18T1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCP4687DH18T1G requirements.
6.How does Aetrix verify that NCP4687DH18T1G is sourced from the original manufacturer or authorized distributors?
All NCP4687DH18T1G 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 NCP4687DH18T1G meets industry standards.
7.What is the process for return or replacement of NCP4687DH18T1G?
All NCP4687DH18T1G units undergo pre-shipment inspection (PSI). If there is an issue with NCP4687DH18T1G, 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 NCP4687DH18T1G part is unused and in its original packaging.
Return procedure for NCP4687DH18T1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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