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Diodes Incorporated AP7370-33WR-7
- Part No.:
- AP7370-33WR-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7370-33WR-7.pdf
- Description:
- IC REG LINEAR 3.3V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:2,777
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Product details
Overview
AP7370-33WR-7 from Diodes Incorporated is a fixed-output 3.3V, 300mA ultra-low dropout (ULDO) linear regulator in SOT25 package, featuring 500mV dropout at 100mA, ±1% output voltage accuracy over load/temperature, and reverse current protection. It operates across 3.2V–18V input range and delivers stable power to USB peripherals, portable instrumentation, and battery-powered weighing scales.
For engineers reviewing the AP7370-33WR-7 datasheet, AP7370-33WR-7 pinout, AP7370-33WR-7 application, or AP7370-33WR-7 equivalent, key selection criteria include input voltage headroom, thermal resistance (155°C/W for SOT25), ground current (≤2.5µA at no load), and compatibility with low-ESR ceramic capacitors without external compensation.
Technical Context
The AP7370-33WR-7 integrates a precision voltage reference, error amplifier, and resistor network to maintain 3.3V output within ±1% tolerance from −40°C to +125°C junction temperature. Its internal current limit circuit triggers at 350mA for VOUT > 2.5V, and thermal shutdown activates at +160°C with +20°C hysteresis.
Designed for high PSRR and low noise operation, it achieves ≤0.5% load regulation across 1mA–300mA and ≤0.05%/V line regulation over 3.2V–18V input. Reverse current protection prevents backfeed when VOUT > VIN, critical in multi-rail systems with shared outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±1% - ensures stable MCU core/logic supply under full load and temperature extremes |
| Max Input Voltage | 18V - supports wide-input industrial and automotive auxiliary rails without pre-regulation |
| Dropout Voltage | 500mV @ 100mA - enables 3.3V output from 3.8V Li-ion single-cell or 5V USB bus with margin |
| Quiescent Current | 2.5µA max @ no load - extends battery life in always-on sensor nodes and metering devices |
| Thermal Shutdown | +160°C activation with +20°C hysteresis - prevents latch-up during sustained overload or poor PCB heatsinking |
| Reverse Current Protection | Integrated - eliminates need for external blocking diode in backup power or OR-ing configurations |
| Load Regulation | ≤0.5% from 1mA to 300mA - maintains ADC reference stability and analog sensor accuracy across dynamic loads |
Pinout & Package
SOT25 (WR) package: 5-pin surface-mount, thermally enhanced plastic case with exposed pad not electrically connected (GND only via pin 2). Pin 3 and pin 4 are NC for fixed-output versions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; accepts 3.2V–18V with transient robustness up to 20V absolute max |
| 2 | GND | Power ground reference; primary thermal path and return for internal current limit sensing |
| 3 | NC | No connect - must be left floating; not internally bonded in fixed-output configuration |
| 4 | NC | No connect - must be left floating; unused in AP7370-33WR-7's factory-programmed 3.3V version |
| 5 | VOUT | Regulated 3.3V output; requires ≥1µF ceramic capacitor (X5R/X7R) on board for stability |
Key Features
| Feature | Design Value |
|---|---|
| Wide input voltage range | 3.2V–18V enables direct connection to unregulated 12V rails or multi-cell battery stacks |
| Ultra-low quiescent current | 1.5µA typical at zero load - reduces standby power loss by >90% vs. legacy LDOs |
| Low-ESR capacitor compatible | Stable with ≥1µF X5R/X7R ceramics - eliminates bulk tantalum and saves board space |
| Short-circuit and thermal protection | Auto-recovery current limit + foldback + thermal shutdown - sustains fault conditions without damage |
| High PSRR at 1kHz | 65dB typical - suppresses switching noise from adjacent DC/DC converters feeding mixed-signal circuits |
Applications
| Battery-Powered Weighing Scales | Portable Medical Sensors |
|---|---|
|
Use Scenario: Precision load-cell signal conditioning in handheld digital scales operating from two AA alkaline cells (1.8V–3.2V). IC Role / Device Role / Timing Role: Primary 3.3V supply for 24-bit sigma-delta ADC and low-power microcontroller. Use Value: 500mV dropout allows full-scale operation down to 2.8V input; ±1% accuracy ensures <0.02% measurement drift over temperature. |
Use Scenario: Powering optical pulse oximeter front-end with analog photodiode amplifier and ADC. IC Role / Device Role / Timing Role: Clean, low-noise 3.3V rail isolating sensitive analog signal chain from digital subsystem. Use Value: 65dB PSRR at 1kHz rejects noise from Bluetooth LE radio; 2.5µA quiescent current extends single-CR2032 battery life to >12 months. |
| Industrial Data Loggers | USB-Powered Test Equipment |
|
Use Scenario: Remote environmental monitoring node with RTD/thermocouple interface, SD card, and LoRaWAN transceiver. IC Role / Device Role / Timing Role: Secondary regulated supply for precision analog front-end and real-time clock. Use Value: 18V max input tolerates 12V field bus transients; reverse current protection prevents backfeed into main buck converter during brownout. |
Use Scenario: Handheld oscilloscope probe interface powered solely from USB 5V port. IC Role / Device Role / Timing Role: Local 3.3V regulator for FPGA configuration and analog acquisition ASIC. Use Value: 300mA output supports burst-mode sampling; SOT25 footprint enables compact 2-layer PCB layout with minimal thermal vias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ULDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-3302E/MB | 300mA, 600mV dropout @ 250mA, 3µA IQ, SOT23-5 package | Higher dropout limits usable input range to ≥3.9V for 3.3V output; smaller package reduces thermal mass | Select when board space is constrained and input voltage remains ≥4.0V; avoid for Li-ion single-cell use below 3.8V |
| TPS7A2033PDQNR | 300mA, 170mV dropout @ 300mA, 6.5µA IQ, X2SON-4 package | Lower dropout enables deeper battery discharge but higher IQ increases standby loss by 2.6× | Prefer for high-current, low-input applications (e.g., 3.6V LiPo); not optimal for multi-year battery life in metering |
Compared with MCP1703T-3302E/MB and TPS7A2033PDQNR, the AP7370-33WR-7 uniquely balances ultra-low IQ (2.5µA), wide 18V input, and 500mV dropout-making it optimal for long-life, wide-input portable instruments where both battery depth-of-discharge and standby duration are critical.
Availability
AP7370-33WR-7 is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical sensors, and industrial data loggers requiring stable component supply with guaranteed long-term sourcing.
Supply support for AP7370-33WR-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 ICs for power management, signal integrity, and connectivity applications.
The AP7370 series belongs to Diodes' high-performance LDO portfolio, engineered specifically for portable and battery-critical systems demanding ultra-low quiescent current, wide input range, and robust protection features.
FAQ
What is the minimum input voltage required for AP7370-33WR-7 to regulate 3.3V output?
The AP7370-33WR-7 requires a minimum input voltage of 3.2V per datasheet Recommended Operating Conditions. At 100mA load, its 500mV dropout means it maintains regulation down to VIN = 3.8V; however, the device remains functional (though unregulated) as low as 3.2V, with output tracking input below dropout threshold.
Can AP7370-33WR-7 be used with aluminum polymer or tantalum output capacitors?
No-AP7370-33WR-7 is optimized exclusively for low-ESR ceramic capacitors (≥1µF X5R/X7R). Aluminum polymer and tantalum capacitors exhibit higher ESR and capacitance drift, which can cause instability, overshoot, or oscillation. The datasheet explicitly states "Compatible with Low ESR Ceramic Capacitor" and provides no stability data for alternative dielectrics.
Is the exposed pad on the SOT25 (WR) package electrically connected?
No-the SOT25 (WR) package for AP7370-33WR-7 has an exposed thermal pad that is not electrically connected to any internal node. It serves only as a mechanical thermal conduction path to the PCB and must be soldered to a copper pour tied to GND for optimal thermal performance (θJA = 155°C/W).
Why is AP7370 marked "NOT RECOMMENDED FOR NEW DESIGN"?
Diodes Incorporated designates AP7370 as "NOT RECOMMENDED FOR NEW DESIGN" because it has been superseded by the AP7375 series, which offers improved thermal performance (lower θJA), tighter initial accuracy (±0.5%), and extended temperature range. AP7370 remains fully supported for existing designs and legacy production, with no announced obsolescence date.
AP7370-33WR-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 100mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 2.5 µA
- Current - Supply (Max):
- 300 µA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Reverse Current, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-25
AP7370-33WR-7 FAQ
1.How can I place an order for AP7370-33WR-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7370-33WR-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 AP7370-33WR-7 reliable?
The price and inventory of AP7370-33WR-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7370-33WR-7 is usually 5 days.
3.What payment methods are accepted for AP7370-33WR-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7370-33WR-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7370-33WR-7?
AP7370-33WR-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7370-33WR-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 AP7370-33WR-7?
For technical support, including AP7370-33WR-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7370-33WR-7 requirements.
6.How does Aetrix verify that AP7370-33WR-7 is sourced from the original manufacturer or authorized distributors?
All AP7370-33WR-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 AP7370-33WR-7 meets industry standards.
7.What is the process for return or replacement of AP7370-33WR-7?
All AP7370-33WR-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7370-33WR-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 AP7370-33WR-7 part is unused and in its original packaging.
Return procedure for AP7370-33WR-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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