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Diodes Incorporated AP7370-18SA-7
- Part No.:
- AP7370-18SA-7
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP7370-18SA-7.pdf
- Description:
- IC REG LINEAR 1.8V 300MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,680
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Product details
Overview
AP7370-18SA-7 from Diodes Incorporated is a fixed-output 1.8V, 300mA ultra-low dropout (ULDO) linear regulator in SOT23 package, featuring 500mV dropout at 100mA, ±1% output voltage accuracy (for VOUT > 2.5V), 1.5–2.5µA quiescent current, and reverse current protection. It operates across 3.2V to 18V input range and supports ceramic output capacitors, making it suitable for battery-powered instrumentation and portable computing power rails.
For engineers reviewing the AP7370-18SA-7 datasheet, AP7370-18SA-7 pinout, AP7370-18SA-7 application, or AP7370-18SA-7 equivalent, key selection criteria include input voltage headroom, load transient response under 150–300mA step changes, thermal performance in SOT23 (θJA = 205°C/W), and compatibility with low-ESR ceramic capacitors in space-constrained designs.
Technical Context
The AP7370-18SA-7 integrates a precision voltage reference, error amplifier, resistor network for fixed 1.8V output, current-limit circuit (200mA min for ≤2.5V versions), chip enable logic, and thermal shutdown at +160°C with +20°C hysteresis. Its architecture enables stable regulation with minimal external components.
Designed for wide-input industrial and portable applications, it delivers 1.8V output with ±1% accuracy over -40°C to +125°C junction temperature, maintains 0.5% load regulation up to 150mA, and achieves 0.05%/V line regulation across 3.2V–18V input range - all while suppressing reverse current flow when VOUT > VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1% (guaranteed over -40°C to +125°C; ensures stable core logic supply) |
| Max Input Voltage | 18V (supports single-cell LiFePO₄, multi-cell alkaline, or unregulated wall adapters) |
| Dropout Voltage | 500mV @ 100mA (enables 1.8V output from as low as 2.3V input; critical for battery end-of-life operation) |
| Quiescent Current | 1.5–2.5µA (minimizes standby power loss in always-on metering and sensor nodes) |
| Current Limit | 200mA min (protects against short-circuit faults without latch-up; defined at VOUT = 98% × nominal) |
| Thermal Shutdown | +160°C with +20°C hysteresis (prevents permanent damage during sustained overload or poor PCB heatsinking) |
| Reverse Current Protection | Integrated (blocks current flow from VOUT to VIN when input is absent or low; eliminates need for external blocking diode) |
Pinout & Package
SOT23-3 package: 2.9mm × 1.3mm × 1.0mm body, surface-mount, RoHS-compliant, with exposed pad not present (standard SOT23).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN | Main input supply connection; accepts 3.2V–18V; requires local 1µF ceramic decoupling |
| 2 | GND | Analog ground reference for regulator feedback and internal circuits; must be low-impedance PCB trace |
| 3 | VOUT | Regulated 1.8V output; drives load and bypass capacitor; reverse-current protected |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range | 3.2V to 18V enables direct connection to varied unregulated sources without pre-regulation stage |
| Ultra-Low IQ | 1.5–2.5µA allows >1-year battery life in 10µA average-load portable devices |
| Ceramic Cap Compatible | Stable with ≥1µF X5R/X7R ceramic output capacitor; eliminates cost/size penalty of tantalum |
| Load Transient Response | ≤50mV deviation for 150mA→300mA step (VIN=5.3V, VOUT=1.8V); sustains microcontroller core stability |
| Thermal & Short-Circuit Protection | Auto-recovery thermal shutdown + foldback current limit prevent field failures under sustained overload |
Applications
| Battery-Powered Instrumentation | Portable Computing Power Rail |
|---|---|
Use Scenario: Digital multimeter with LCD display and microcontroller operating from two AA cells (2.4V–3.2V). IC Role / Device Role / Timing Role: Primary 1.8V LDO supplying MCU core and ADC reference. Use Value: Maintains regulation down to 2.3V input (1.8V + 500mV dropout), extending usable battery life by 18% vs. standard LDOs. |
Use Scenario: Palmtop device requiring clean 1.8V for ARM Cortex-M4 core and SRAM interface. IC Role / Device Role / Timing Role: Point-of-load regulator for processor I/O and memory subsystem. Use Value: 0.5% load regulation ensures <±18mV VDD variation across 1–150mA load swing, preventing timing margin violations. |
| Weighing Scale Sensor Interface | Metering Data Acquisition Unit |
Use Scenario: Strain-gauge-based kitchen scale using 24-bit sigma-delta ADC powered from single lithium coin cell. IC Role / Device Role / Timing Role: Low-noise 1.8V supply for ADC reference and analog front-end. Use Value: 1.5µA quiescent current enables >3-year shelf life; reverse current protection prevents battery drain when USB is connected. |
Use Scenario: Smart electricity meter with real-time clock, metrology IC, and RF transceiver sharing a common 1.8V rail. IC Role / Device Role / Timing Role: Main system voltage regulator supporting concurrent analog/digital/RF operation. Use Value: 0.05%/V line regulation rejects ripple from switching DC-DC stages upstream, reducing conducted EMI on sensitive metrology paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ULDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/TT (Microchip) | 1.8V, 250mA, 6µA IQ, 17V max input, no reverse current protection | Lacks reverse current blocking; requires external diode in dual-power-source systems | Prefer when ultra-low IQ is secondary to cost and footprint; verify external diode necessity in your topology |
| TPS70918DRVR (TI) | 1.8V, 150mA, 1µA IQ, 30V max input, reverse current protection, but lower current rating | Rated only to 150mA - insufficient for 300mA peak loads in portable computing use cases | Select only if load current remains ≤150mA and extended input range (up to 30V) is required |
Compared with MCP1700T-1802E/TT and TPS70918DRVR, AP7370-18SA-7 uniquely balances 300mA output, 1.8V precision, integrated reverse current blocking, and SOT23 footprint - making it optimal for space-constrained, dual-source battery/USB devices where load peaks exceed 150mA.
Availability
AP7370-18SA-7 is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable computing power rails, weighing scale sensor interfaces, and metering data acquisition units requiring stable component supply and long-term design continuity.
Supply support for AP7370-18SA-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, with emphasis on high-reliability power management and signal integrity products.
The AP7370 series belongs to Diodes' wide-input ULDO regulator product line, engineered specifically for portable and battery-operated equipment demanding high accuracy, ultra-low quiescent current, and robust protection features in compact packages.
FAQ
What is the maximum continuous output current for AP7370-18SA-7?
The AP7370-18SA-7 is rated for 300mA continuous output current under recommended operating conditions (TJ ≤ +125°C, VIN ≤ 18V). Its current limit is specified at 200mA minimum for 1.8V versions, but full 300mA operation is supported with adequate PCB copper area and ambient temperature control per θJA = 205°C/W.
Does AP7370-18SA-7 require an input capacitor?
Yes - a minimum 1.0µF ceramic capacitor is required at VIN to ensure stability and suppress high-frequency noise from upstream sources. The datasheet specifies CIN = 1.0µF X5R/X7R ceramic, placed within 2mm of the VIN and GND pins, with low-ESR (<100mΩ) and low-ESL layout practices.
Can AP7370-18SA-7 be used with a 2.4V input to deliver 1.8V?
No - the absolute minimum input voltage is 3.2V per Recommended Operating Conditions. At 1.8V output, the 500mV dropout requires ≥2.3V, but the IC's internal circuitry mandates ≥3.2V for proper biasing of the reference and error amplifier; operation below 3.2V is undefined and unsupported.
Is AP7370-18SA-7 pin-compatible with other AP7370 variants in SOT23?
Yes - all AP7370 variants in SOT23 (SA suffix) share identical 3-pin SOT23-3 pinout: Pin 1 = VIN, Pin 2 = GND, Pin 3 = VOUT. Output voltage is set internally; no external resistors are needed, and no NC pins exist in this package configuration.
AP7370-18SA-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):
- 18V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- 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-23-3
AP7370-18SA-7 FAQ
1.How can I place an order for AP7370-18SA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7370-18SA-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 AP7370-18SA-7 reliable?
The price and inventory of AP7370-18SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7370-18SA-7 is usually 5 days.
3.What payment methods are accepted for AP7370-18SA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7370-18SA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7370-18SA-7?
AP7370-18SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7370-18SA-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 AP7370-18SA-7?
For technical support, including AP7370-18SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7370-18SA-7 requirements.
6.How does Aetrix verify that AP7370-18SA-7 is sourced from the original manufacturer or authorized distributors?
All AP7370-18SA-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 AP7370-18SA-7 meets industry standards.
7.What is the process for return or replacement of AP7370-18SA-7?
All AP7370-18SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7370-18SA-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 AP7370-18SA-7 part is unused and in its original packaging.
Return procedure for AP7370-18SA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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