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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Diodes Incorporated AP7315D-135W5-7

Name: AP7315D-135W5-7
Brand: Diodes Incorporated
SKU: AP7315D-135W5-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7315D-135W5-7

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: SC-74A, SOT-753

Datasheet:: AP7315D-135W5-7.pdf

Description:: IC REG LINEAR 1.35V 150MA SOT25

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AP7315D-135W5-7 from Diodes Incorporated is a 150mA low-dropout linear regulator with fixed 1.35V output, ±1% accuracy, 75dB PSRR at 1kHz, 60µVrms output noise (10Hz–100kHz), and 35µA quiescent current. It features enable control, built-in discharge function, and operates from 1.7V to 5.25V input - optimized for RF supply rails in portable wireless communication devices.

For engineers reviewing the AP7315D-135W5-7 datasheet, AP7315D-135W5-7 pinout, AP7315D-135W5-7 application, or AP7315D-135W5-7 equivalent, key selection criteria include dropout voltage at 150mA (0.50V max for 1.35V VOUT), EN logic thresholds (0.5V low / 1.3V high), thermal performance in SOT25, and compatibility with 0.47µF ceramic input/output capacitors.

Technical Context

The AP7315D-135W5-7 integrates a CMOS-based error amplifier, precision voltage reference, current-limit circuit, and active discharge path activated during shutdown. Its architecture delivers stable regulation under fast load transients while suppressing input ripple across 100Hz–1MHz.

Unlike non-discharge variants (e.g., AP7315-135W5-7), the "D" suffix denotes an internal 30Ω N-channel MOSFET between VOUT and GND that discharges the output capacitor when EN is low - critical for systems requiring rapid rail collapse and zero hold-up voltage.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 1.35V ±1% - ensures precise biasing for low-voltage RF amplifiers and baseband ICs without external feedback.
Max Output Current	150mA continuous - supports moderate-power RF modules and sensor interfaces without thermal derating in SOT25.
PSRR	75dB at 1kHz - suppresses switching noise from adjacent DC/DC converters feeding shared input rails.
Output Noise	60µVrms (10Hz–100kHz) - minimizes phase noise degradation in VCOs and LNAs powered from this rail.
Quiescent Current	35µA typical - enables >1-year battery life in always-on IoT sensor nodes with periodic wake-up cycles.
Dropout Voltage	0.50V max at 150mA - allows operation from single-cell Li-ion (3.0V min) down to 1.85V input while maintaining regulation.
Enable Thresholds	V_IL ≤ 0.5V, V_IH ≥ 1.3V - compatible with 1.8V and 3.3V GPIOs without level-shifting.

Pinout & Package

SOT25 (5-pin, 2.9mm × 1.6mm × 1.1mm) package with exposed thermal pad (not electrically connected). Requires PCB copper pour tied to GND for thermal management.

Pin/Terminal	Circuit Role	Design Meaning
1 – VIN	Input power supply	Accepts 1.7V–5.25V; requires 0.47µF ceramic capacitor placed within 2mm of pin for stability.
2 – GND	Power ground reference	Must connect directly to low-impedance ground plane; serves as return path for VIN, VOUT, and EN currents.
3 – EN	Enable control input	Active-high logic; floating state disables regulator; must be driven to <0.5V (off) or >1.3V (on).
4 – NC	No-connect terminal	Internally unconnected; recommended to tie to GND for improved thermal conduction and EMI shielding.
5 – VOUT	Regulated output	Delivers 1.35V ±1%; includes internal discharge FET (30Ω) to rapidly deplete external capacitance when disabled.

Key Features

Feature	Design Value
Active output discharge	30Ω on-chip NMOS discharges VOUT to <0.1V within 100µs after EN deactivation - prevents latch-up in downstream logic.
Ultra-low noise	60µVrms output noise enables direct powering of sensitive RF front-end components without additional filtering.
High PSRR at low frequency	75dB rejection at 1kHz mitigates ripple from buck converter switching frequencies and their harmonics.
Low-I_Q operation	35µA quiescent current reduces standby power loss - critical for battery-powered wearable and sensor applications.
Wide input range	1.7V–5.25V operation supports single-cell Li-ion, Li-polymer, and 3.3V system rails without intermediate regulation.

Applications

RF Power Amplifier Bias

Low-Power Microcontroller Core Supply

Use Scenario: Providing clean, stable 1.35V bias to GaAs pHEMT power amplifiers in Bluetooth/Wi-Fi modules.

IC Role / Device Role / Timing Role: LDO supplies regulated V_CC to PA drain, replacing noisier switching regulators to minimize EVM degradation.

Use Value: 60µVrms noise and 75dB PSRR prevent AM-to-PM conversion and maintain ACLR < –45dBc in 2.4GHz transmission.

Use Scenario: Powering ARM Cortex-M0+ core logic in ultra-low-power IoT edge nodes operating from coin-cell batteries.

IC Role / Device Role / Timing Role: Delivers precise 1.35V VDD_CORE during active compute cycles and enters ultra-low-I_Q mode during sleep.

Use Value: 35µA quiescent current extends battery life to >18 months in 10-second wake-up intervals with 10ms active duration.

Camera Image Sensor Analog Rail

Wireless Transceiver Reference Voltage

Use Scenario: Supplying analog pixel array and column ADC circuitry in compact mobile camera modules.

IC Role / Device Role / Timing Role: Low-noise LDO isolates image sensor analog supply from noisy digital domains and flash LED drivers.

Use Value: ±1% output accuracy and <30ppm/°C drift ensure consistent pixel response across -20°C to +70°C ambient range.

Use Scenario: Generating stable 1.35V reference for PLL charge pumps and VCO tuning circuits in sub-GHz ISM band transceivers.

IC Role / Device Role / Timing Role: Provides low-phase-noise bias to oscillator core, reducing integrated jitter in synthesized LO signals.

Use Value: 60µVrms noise contributes <0.1° RMS jitter in 10kHz–10MHz offset band, meeting IEEE 802.15.4 spectral mask requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1703T-135I/TT	150mA, 1.35V, ±2% accuracy, no discharge FET, 65dB PSRR @ 1kHz, 55µVrms noise	Lacks active discharge; unsuitable where rapid VOUT collapse is required (e.g., multi-rail sequencing)	Select when cost sensitivity outweighs discharge need and PSRR/noise margin is acceptable.
Torex XC6210B135MR-G	150mA, 1.35V, ±1% accuracy, discharge FET (50Ω), 70dB PSRR @ 1kHz, 45µVrms noise, SOT25-compatible	Lower noise but higher dropout (0.6V @ 150mA); tighter thermal limits in SOT25	Prefer for ultra-low-noise designs where 0.1V higher dropout is tolerable and thermal headroom exists.

Compared with MCP1703T-135I/TT, AP7315D-135W5-7 adds guaranteed discharge functionality and 5dB higher PSRR; versus XC6210B135MR-G, it trades 15µVrms noise reduction for 0.1V lower dropout and superior thermal robustness in SOT25.

Availability

AP7315D-135W5-7 is available at Aetrix Electronics and suitable for RF supply, portable media player power management, and wireless adapter subsystems requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for AP7315D-135W5-7 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 power management, signal integrity, and connectivity applications.

The AP7315 series belongs to Diodes' high-PSRR, low-noise LDO portfolio designed specifically for noise-sensitive RF, imaging, and portable communication systems where clean, efficient local regulation is critical.

FAQ

What is the purpose of the NC pin (Pin 4) in the SOT25 package?

Pin 4 is internally not connected and serves no electrical function. Diodes Incorporated recommends tying it to GND on the PCB to maximize copper area for thermal dissipation and improve EMI shielding - it does not act as a ground electrode but enhances thermal coupling to the board.

Does the AP7315D-135W5-7 require an external discharge resistor?

No. The "D" suffix indicates an integrated discharge FET (30Ω typical) between VOUT and GND. When EN is low, this FET actively pulls VOUT to near-GND, eliminating the need for external resistors and ensuring predictable discharge timing (<100µs for 1µF load).

Can the AP7315D-135W5-7 operate with only a 0.22µF output capacitor?

No. The datasheet specifies minimum 0.47µF ceramic output capacitance for stability across temperature and load. Using 0.22µF risks oscillation and degraded transient response, especially above 50mA load steps - verified by ESR vs. IOUT stability curves in DS38352 Rev. 2-2.

How does the AP7315D-135W5-7 behave during input undervoltage (VIN < 1.7V)?

Below 1.7V, regulation ceases and VOUT follows VIN minus dropout voltage until the internal reference shuts down. Output current drops to near-zero, quiescent current remains ~35µA, and EN retains full control - no latch-up or damage occurs, per Absolute Maximum Ratings.

AP7315D-135W5-7 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):: 5.25V

Voltage - Output (Min/Fixed):: 1.35V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.64V @ 150mA

Current - Output:: 150mA

Current - Quiescent (Iq):: 60 µA

Current - Supply (Max):: 100 µA

PSRR:: 75dB (1kHz)

Control Features:: Enable

Protection Features:: Over Current

Operating Temperature:: -40°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-25

AP7315D-135W5-7 FAQ

1.How can I place an order for AP7315D-135W5-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7315D-135W5-7 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 AP7315D-135W5-7 reliable?

The price and inventory of AP7315D-135W5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7315D-135W5-7 is usually 5 days.

3.What payment methods are accepted for AP7315D-135W5-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7315D-135W5-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7315D-135W5-7?

AP7315D-135W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7315D-135W5-7 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 AP7315D-135W5-7?

For technical support, including AP7315D-135W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7315D-135W5-7 requirements.

6.How does Aetrix verify that AP7315D-135W5-7 is sourced from the original manufacturer or authorized distributors?

All AP7315D-135W5-7 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 AP7315D-135W5-7 meets industry standards.

7.What is the process for return or replacement of AP7315D-135W5-7?

All AP7315D-135W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7315D-135W5-7, 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 AP7315D-135W5-7 part is unused and in its original packaging.

Return procedure for AP7315D-135W5-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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