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Diodes Incorporated AP7387-36SA-7
- Part No.:
- AP7387-36SA-7
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP7387-36SA-7.pdf
- Description:
- LDO CMOS LowCurr SOT23 T&R 3K
- Quantity:
- Payment:
- Shipping:
Inventory:2,879
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Product details
Overview
AP7387-36SA-7 from Diodes Incorporated is a 3.6V fixed-output, wide-input (5–60V), 150mA ultra-low-dropout linear regulator in SOT23 package, featuring 700mV dropout at 100mA, 2μA quiescent current, and 70dB PSRR at 1kHz - designed for battery-powered smoke detectors and EV battery management systems where input voltage varies widely and standby power must be minimized.
For engineers reviewing the AP7387-36SA-7 datasheet, AP7387-36SA-7 pinout, AP7387-36SA-7 application, or AP7387-36SA-7 equivalent, this page delivers verified electrical parameters, thermal performance data, SOT23 pin mapping, real-world use cases in safety-critical sensing, and validated alternative parts with documented functional trade-offs.
Technical Context
The AP7387-36SA-7 integrates a precision voltage reference, error amplifier, and current-limit circuit to maintain stable 3.6V output across 5–60V input while delivering up to 150mA. Its fast transient response handles rapid load steps (10–150mA) with ≤50mV undershoot/overshoot.
Internal protections include thermal shutdown at +150°C with +30°C hysteresis, short-circuit current limiting at 250mA, and overtemperature protection that disables the pass transistor until junction temperature falls below threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.6V ±2% - ensures accurate MCU core or sensor biasing without external feedback components. |
| Input Voltage Range | 5V to 60V - supports direct connection to 12V/24V/48V industrial buses and unregulated EV battery packs. |
| Max Output Current | 150mA - sufficient to power low-power microcontrollers, analog sensors, or RF transceivers in compact designs. |
| Dropout Voltage | 700mV @ 100mA (typ.) - enables regulation down to VIN = 4.3V, critical for deep battery discharge operation. |
| Quiescent Current | 2μA (typ.) - extends battery life in always-on smoke detectors beyond 10 years with standard alkaline cells. |
| PSRR | 70dB @ 1kHz - suppresses switching noise from adjacent DC-DC converters feeding shared input rails. |
| Thermal Resistance θJA | 248.5°C/W (SOT23) - requires minimal PCB copper area for thermal relief in space-constrained smoke alarm modules. |
Pinout & Package
SOT23-3 package: 3-pin surface-mount, JEDEC TO-236AB outline, 0.95mm pitch, 2.4mm × 1.3mm footprint, exposed pad not present.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply pin - connect 1μF ceramic capacitor directly to GND for high-frequency noise suppression. |
| 2 | GND | Power ground reference - tie to system ground plane with shortest possible trace to minimize impedance. |
| 3 | VOUT | Regulated 3.6V output - place 10μF X7R ceramic capacitor within 2mm of this pin and GND for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Wide input range (5–60V) | Eliminates need for pre-regulation stages in automotive and industrial 24V/48V systems. |
| 2μA quiescent current | Reduces standby power to <10μW at 3.6V, enabling decade-long battery life in wireless sensors. |
| 70dB PSRR @ 1kHz | Rejects ripple from upstream buck converters, preventing noise coupling into ADC references. |
| Thermal shutdown with hysteresis | +150°C trip with +30°C release prevents oscillation during sustained overload in enclosed enclosures. |
| Current limit (250mA) | Clamps fault current before PCB trace fusing, protecting wiring in battery management cell monitors. |
Applications
| Smoke Detector Power Supply | EV Battery Cell Monitor |
|---|---|
|
Use Scenario: Primary 3.6V rail for electrochemical CO sensor, MCU, and RF transmitter in battery-powered residential smoke alarms. IC Role / Device Role / Timing Role: LDO regulator providing clean, low-noise power independent of declining 9V alkaline battery voltage (6–9V). Use Value: 2μA IQ extends battery service life beyond 10 years; 60V max input tolerates accidental 24V test equipment contact. |
Use Scenario: Local 3.6V supply for isolated cell voltage measurement ICs and CAN transceivers in 400V EV battery packs. IC Role / Device Role / Timing Role: Post-DC-DC regulation stage delivering stable voltage to precision ADCs and isolation interfaces. Use Value: 700mV dropout allows operation down to 4.3V input, supporting auxiliary supply derived from tapped battery strings. |
| Microcontroller Core Supply | Home Appliance Sensor Hub |
|
Use Scenario: Dedicated 3.6V rail for ARM Cortex-M0+ MCU in smart thermostat with dual 3V coin-cell backup. IC Role / Device Role / Timing Role: Low-noise, low-IQ regulator ensuring reliable boot and RTC operation during main power loss. Use Value: ±2% output accuracy maintains MCU timing integrity; fast load transient response prevents brownout resets during radio wake-up. |
Use Scenario: Power source for humidity, temperature, and motion sensors in Wi-Fi-enabled washing machine control board. IC Role / Device Role / Timing Role: Point-of-load regulator decoupling noisy motor drive section from sensitive analog front-end. Use Value: 70dB PSRR isolates sensor signal chain from PWM-induced supply ripple; SOT23 footprint saves space on dense control PCB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-IQ, wide-input LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7361-36SA-7 | Lower max input (45V), higher IQ (3.5μA), same 3.6V output and SOT23 package. | Not suitable for 60V EV battery tap points; acceptable for 24V industrial PLC I/O modules. | Select when input never exceeds 45V and cost sensitivity outweighs 1.5μA IQ penalty. |
| MCP1703T-3602E/MB | 45V max input, 2.5μA IQ, 3.6V output, SOT23-3, but only 250mA PSRR (60dB @ 1kHz). | Lacks noise rejection needed for precision sensor biasing near switching regulators. | Choose for non-critical digital-only loads where PSRR >65dB is not required. |
Compared with AP7387-36SA-7, AP7361-36SA-7 trades 15V input headroom for marginally higher quiescent current, while MCP1703T-3602E/MB sacrifices 10dB PSRR and 15V input range - making AP7387-36SA-7 uniquely suited for high-noise, high-voltage battery monitoring where both ultra-low IQ and robust ripple rejection are mandatory.
Availability
AP7387-36SA-7 is available at Aetrix Electronics and suitable for battery-powered equipment, smoke detectors and sensors, and EV/HEV battery management systems requiring stable component supply with guaranteed long-term continuity.
Supply support for AP7387-36SA-7 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions for industrial, automotive, and consumer markets, with design centers across Asia, Europe, and North America.
The AP7387 series belongs to Diodes' high-reliability LDO portfolio targeting safety-critical and battery-constrained applications - engineered specifically for wide-input, ultra-low-quiescent-current operation in harsh ambient environments.
FAQ
What is the minimum input voltage required for regulation at 3.6V output?
The AP7387-36SA-7 requires VIN ≥ VOUT + VDROP. With typical dropout of 700mV at 100mA, minimum input is 4.3V. At full 150mA load, dropout rises to 1100mV, requiring VIN ≥ 4.7V. Input below 5V is not recommended per absolute maximum ratings.
Can AP7387-36SA-7 operate with ceramic output capacitors smaller than 10μF?
No - the datasheet specifies a minimum 10μF ceramic capacitor (X7R/X5R) for stability. Using less capacitance risks oscillation or excessive output voltage overshoot during load transients, especially above 50mA step changes.
Does the SOT23 package of AP7387-36SA-7 include an exposed thermal pad?
No - the SOT23-3 variant (SA suffix) has no exposed pad. Thermal dissipation relies solely on the three leads and PCB copper area under the body. For higher power handling, consider U-DFN2020-6 (FDC suffix) with 48°C/W θJA.
Is AP7387-36SA-7 qualified for automotive applications?
No - AP7387-36SA-7 is an industrial-grade part. The automotive-compliant version is AP7387Q, which undergoes AEC-Q100 qualification and is offered in different packaging (e.g., SOT25 or U-DFN2020-6) with extended temperature range and enhanced reliability testing.
AP7387-36SA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 3.6V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.35V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 4 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Current Limit
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
AP7387-36SA-7 FAQ
1.How can I place an order for AP7387-36SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7387-36SA-7 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 AP7387-36SA-7 reliable?
The price and inventory of AP7387-36SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7387-36SA-7 is usually 5 days.
3.What payment methods are accepted for AP7387-36SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7387-36SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7387-36SA-7?
AP7387-36SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7387-36SA-7 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 AP7387-36SA-7?
For technical support, including AP7387-36SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7387-36SA-7 requirements.
6.How does Aetrix verify that AP7387-36SA-7 is sourced from the original manufacturer or authorized distributors?
All AP7387-36SA-7 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 AP7387-36SA-7 meets industry standards.
7.What is the process for return or replacement of AP7387-36SA-7?
All AP7387-36SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7387-36SA-7, 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 AP7387-36SA-7 part is unused and in its original packaging.
Return procedure for AP7387-36SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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