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Diodes Incorporated AP7343D-135W5-7
- Part No.:
- AP7343D-135W5-7
- Manufacturer:
- Diodes Incorporated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
AP7343D-135W5-7.pdf
- Description:
- IC REG LINEAR 1.35V 300MA SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:4,189
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Product details
Overview
AP7343D-135W5-7 from Diodes Incorporated is a 300mA low-dropout linear regulator with fixed 1.35V output, high PSRR (75dB at 1kHz), ultra-low noise (60µVrms, 10Hz–100kHz), ±1% output voltage accuracy, and enable-controlled shutdown. It operates from 1.7V to 5.25V input and targets RF supply rails and portable media subsystems requiring stable, quiet bias.
For engineers reviewing the AP7343D-135W5-7 datasheet, AP7343D-135W5-7 pinout, AP7343D-135W5-7 application, or AP7343D-135W5-7 equivalent, key selection criteria include dropout voltage at 300mA (0.35V typ. for 1.35VOUT in SOT25), thermal resistance (179°C/W), EN logic thresholds (0.5VIL/1.3VIH), and built-in discharge functionality.
Technical Context
The AP7343D-135W5-7 uses a CMOS-based LDO architecture with integrated voltage reference, error amplifier, current limit, and thermal shutdown circuitry. Its enable input (EN) provides precise on/off control with <1.0µA leakage and defined logic thresholds (0–0.5V low, 1.3–5.25V high).
It features active output discharge via an internal N-channel MOSFET (RON = 30Ω typical) when disabled, ensuring rapid VOUT decay to prevent back-powering or latch-up in multi-rail systems. The device supports stable operation with 1µF ceramic CIN/COUT and exhibits <30mV load regulation across 1–300mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.35V ±1% - eliminates external feedback network; ensures precision bias for 1.35V-core logic or analog sensors. |
| Max Output Current | 300mA - sufficient for powering RF transceivers, camera ISPs, or baseband processors in portable devices. |
| PSRR | 75dB at 1kHz - suppresses switching noise from adjacent DC/DC converters, critical for RF front-end stability. |
| Output Noise | 60µVrms (10Hz–100kHz) - enables clean power for low-noise amplifiers, ADC references, and PLL VCO supplies. |
| Quiescent Current | 35µA typical - extends battery life in always-on sensor nodes and standby modes of handheld equipment. |
| Dropout Voltage | 0.35V at 300mA (1.35VOUT, SOT25) - allows operation down to 1.7V input, compatible with single-cell Li-ion (2.7–4.2V) with margin. |
| Enable Thresholds | VIL ≤ 0.5V, VIH ≥ 1.3V - interfaces directly with 1.8V/3.3V GPIO without level-shifting. |
Pinout & Package
AP7343D-135W5-7 is packaged in SOT25 (5-pin, 2.9mm × 1.6mm × 1.1mm), featuring exposed pad for thermal enhancement. Pin 1 is VIN, Pin 2 is GND, Pin 3 is EN, Pin 4 is VOUT, and Pin 5 is NC (no connection). The exposed pad must be connected to PCB ground plane for optimal thermal performance (RθJB = 79.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | Accepts 1.7–5.25V; requires ≥0.47µF ceramic decoupling capacitor placed adjacent to pin to suppress supply glitches. |
| GND (Pin 2) | Ground Reference | Primary return path for load current and internal circuits; must connect to low-impedance ground plane to minimize noise coupling. |
| EN (Pin 3) | Enable Control | Active-high logic input; drives regulator into shutdown (<1µA ISTANDBY) when pulled ≤0.5V; must not float. |
| VOUT (Pin 4) | Regulated Output | Delivers 1.35V ±1% at up to 300mA; includes internal discharge FET to rapidly pull down output when disabled. |
| NC (Pin 5) | No Connection | Not internally bonded; may be left unconnected or tied to GND for mechanical stability-no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Output Discharge | 30Ω N-channel FET actively discharges VOUT during shutdown-prevents floating outputs and simplifies power sequencing in multi-voltage systems. |
| Ultra-Low Noise Regulation | 60µVrms broadband noise enables direct powering of noise-sensitive analog blocks without additional filtering. |
| High PSRR at Low Frequencies | 75dB rejection at 1kHz mitigates ripple from buck converter switching edges and improves RF signal integrity. |
| Low Quiescent Current | 35µA operating current supports >1-year battery life in always-on IoT sensor nodes drawing <10µA average system current. |
| Thermal Protection | 150°C junction shutdown with 20°C hysteresis prevents permanent damage during sustained overload or poor heatsinking. |
Applications
| RF Power Amplifier Bias | Camera Image Signal Processor |
|---|---|
|
Use Scenario: Providing clean, stable 1.35V bias to GaAs pHEMT or SiGe HBT RF power amplifiers in 4G/5G mobile front-ends. IC Role / Device Role / Timing Role: Low-noise LDO delivering regulated VCC_PA with fast transient response to handle burst-mode TX current spikes. Use Value: 60µVrms noise and 75dB PSRR prevent AM-to-PM distortion and EVM degradation in high-order QAM signals. |
Use Scenario: Supplying core voltage to image signal processors in smartphone camera modules operating at 1.35V. IC Role / Device Role / Timing Role: Primary 300mA LDO for ISP digital core, enabled synchronously with sensor startup via host processor GPIO. Use Value: ±1% output accuracy ensures consistent timing margins across process/voltage/temperature corners; 0.35V dropout enables use with shared 1.8V rail. |
| Portable Media Decoder | Wireless Adapter Baseband |
|
Use Scenario: Powering audio/video decode ASICs in Bluetooth headphones or portable media players requiring 1.35V logic supply. IC Role / Device Role / Timing Role: Always-on LDO with EN controlled by system PMIC to gate power during sleep states. Use Value: 35µA quiescent current minimizes standby drain; built-in discharge prevents residual charge from interfering with codec reset sequences. |
Use Scenario: Regulating 1.35V for Wi-Fi/BT SoC baseband subsystems in compact wireless adapters and dongles. IC Role / Device Role / Timing Role: Secondary LDO fed from main 3.3V DC/DC, providing isolated, low-noise supply for sensitive RF interface logic. Use Value: SOT25 footprint enables dense layout in space-constrained USB dongles; 179°C/W RθJA supports full 300mA load without derating at +70°C ambient. |
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 (Microchip) | Same 1.35V output, but no discharge FET; higher IQ (2.5µA vs. 35µA); lower PSRR (65dB @ 1kHz). | Lacks active discharge-requires external circuitry for safe power-down sequencing in multi-rail systems. | Select when discharge is unnecessary and lowest possible quiescent current is prioritized over noise/PSRR. |
| Torex XC6210B135MR-G (Torex) | 1.35V output, 300mA rating, but no EN pin; fixed ON state; 50µVrms noise, 70dB PSRR. | Cannot be software-controlled-only suitable for permanently enabled rails where sequencing is handled externally. | Select for cost-sensitive, always-on applications where enable control and discharge are not required. |
Compared with MCP1703T-135I/TT and XC6210B135MR-G, the AP7343D-135W5-7 uniquely combines 1.35V precision, 300mA capability, active discharge, and industry-leading 75dB PSRR-making it optimal for RF and imaging subsystems demanding both control flexibility and signal integrity.
Availability
AP7343D-135W5-7 is available at Aetrix Electronics and suitable for RF power amplifier bias, camera image signal processor supplies, portable media decoder cores, and wireless adapter baseband subsystems requiring stable component supply with guaranteed long-term sourcing.
Supply support for AP7343D-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-performance power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.
The AP7343 series belongs to Diodes' high-PSRR, low-noise LDO product line, designed specifically for noise-sensitive portable electronics where clean, efficient, and controllable bias is essential for RF, imaging, and audio subsystems.
FAQ
What is the maximum input voltage for AP7343D-135W5-7?
The absolute maximum input voltage is 6.0V, but the recommended operating range is 1.7V to 5.25V. Exceeding 5.25V risks violating the specified electrical characteristics and may trigger thermal shutdown under load. Operation above 5.25V is not guaranteed and reduces reliability margin.
Does AP7343D-135W5-7 require an external output capacitor?
Yes-an output capacitor is mandatory for stability and transient response. A minimum 1.0µF X5R/X7R ceramic capacitor with low ESR (≤10mΩ) is recommended and must be placed within 2mm of the VOUT and GND pins. Larger values (e.g., 4.7µF) improve load-step response but do not affect basic stability.
How does the built-in discharge function operate?
When the EN pin is driven low, the internal 30Ω N-channel FET connects VOUT to GND, discharging the output capacitance. This occurs automatically without external components and ensures VOUT falls below 0.1V within ~100µs (typ.) for a 1µF load, preventing back-powering of upstream circuitry.
Can AP7343D-135W5-7 be used in automotive applications?
The standard AP7343D-135W5-7 is rated for –40°C to +85°C ambient and is not AEC-Q200 qualified. For automotive use, Diodes offers the AP7343Q variant (separate datasheet), which undergoes extended temperature screening and qualification testing per AEC-Q100 requirements.
AP7343D-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):
- 0.58V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 60 µA
- Current - Supply (Max):
- -
- 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
AP7343D-135W5-7 FAQ
1.How can I place an order for AP7343D-135W5-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7343D-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 AP7343D-135W5-7 reliable?
The price and inventory of AP7343D-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 AP7343D-135W5-7 is usually 5 days.
3.What payment methods are accepted for AP7343D-135W5-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7343D-135W5-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7343D-135W5-7?
AP7343D-135W5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7343D-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 AP7343D-135W5-7?
For technical support, including AP7343D-135W5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7343D-135W5-7 requirements.
6.How does Aetrix verify that AP7343D-135W5-7 is sourced from the original manufacturer or authorized distributors?
All AP7343D-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 AP7343D-135W5-7 meets industry standards.
7.What is the process for return or replacement of AP7343D-135W5-7?
All AP7343D-135W5-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7343D-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 AP7343D-135W5-7 part is unused and in its original packaging.
Return procedure for AP7343D-135W5-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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