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Diodes Incorporated PAM3101AAA475
- Part No.:
- PAM3101AAA475
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
PAM3101AAA475.pdf
- Description:
- IC REG LIN 4.75V 300MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,155
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Product details
Overview
PAM3101AAA475 from Diodes Incorporated is a 4.75V fixed-output, 300mA low-dropout CMOS linear regulator in SOT-23-3 package with 180mV dropout at 300mA, 65µA quiescent current, and 70dB PSRR at 1kHz-designed for noise-sensitive battery-powered systems such as Bluetooth earphones and portable cameras.
For engineers reviewing the PAM3101AAA475 datasheet, PAM3101AAA475 pinout, PAM3101AAA475 application, or PAM3101AAA475 equivalent, key selection criteria include output voltage accuracy (±2%), thermal shutdown behavior, EN pin configuration (not present in this variant), stability with ≥2.2µF ceramic output capacitor, and compatibility with low-ESR capacitors for optimal transient response.
Technical Context
The PAM3101AAA475 uses a P-channel MOSFET pass transistor with 0.75Ω on-resistance, enabling ultra-low ground current across load conditions. Its internal reference and error amplifier deliver ±2% output voltage accuracy over temperature and line/load variations.
It operates within 2.5V–5.5V input range and features built-in current limiting (400mA typical), short-circuit protection, and thermal shutdown activation at +150°C with +30°C hysteresis-ensuring robust operation under fault conditions without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 4.75V ±2% - tightly regulated rail for precision analog or RF subsystems requiring stable bias |
| Max Output Current | 300mA - sufficient to power baseband processors or audio codecs in portable devices |
| Dropout Voltage | 180mV @ 300mA (VO = 3.3V) - extends usable battery life down to ~4.93V input for Li-ion cells |
| Quiescent Current | 65µA typ. - minimizes standby power loss in always-on wearable sensors or BLE peripherals |
| PSRR | 70dB @ 1kHz - suppresses switching noise from DC-DC converters feeding the LDO input |
| Operating Temp | −40°C to +85°C - qualified for consumer and industrial portable equipment environments |
| Thermal Shutdown | Activates at +150°C, resumes at +120°C - prevents permanent damage during sustained overload or poor PCB heatsinking |
Pinout & Package
SOT-23-3 package: compact 2.92mm × 1.3mm × 1.0mm footprint with gull-wing leads, optimized for high-density portable PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Low-impedance return path for load current and internal bias; must connect to solid ground plane |
| 2 (VOUT) | Regulated output | Delivers stable 4.75V to downstream circuitry; requires ≥2.2µF ceramic capacitor with ESR >5mΩ for stability |
| 3 (VIN) | Input supply | Accepts 2.5V–5.5V unregulated input; decoupling capacitor (>1µF) must be placed ≤0.5 inch from pin |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout architecture | 180mV @ 300mA enables operation with minimal headroom-critical for single-cell Li-ion systems near end-of-discharge |
| High PSRR filtering | 70dB @ 1kHz rejects ripple from upstream switching regulators, preserving signal integrity in audio/RF stages |
| Thermal & current protection | Integrated OTP and foldback current limit eliminate need for external fault management circuitry |
| Stability with small capacitors | Guaranteed stable with 2.2µF ceramic output cap-reduces BOM count and board area vs. larger tantalum solutions |
| Ultra-low quiescent current | 65µA typ. extends battery runtime in sleep-mode applications like wireless sensor nodes |
Applications
| Bluetooth Earphones | Digital Cameras |
|---|---|
Use Scenario: Powering MEMS microphones and Class-D audio amplifiers in compact wireless earbuds. IC Role / Device Role / Timing Role: Primary 4.75V bias rail regulator delivering clean, low-noise voltage to sensitive analog front-end circuitry. Use Value: 70dB PSRR prevents audible switching noise from DC-DC converters from coupling into audio path. |
Use Scenario: Supplying image sensor bias and ISP core logic in pocket-sized digital cameras. IC Role / Device Role / Timing Role: Low-quiescent LDO providing stable 4.75V for CCD/CMOS sensor analog blocks and timing generators. Use Value: ±2% output accuracy ensures consistent sensor gain calibration and exposure control across temperature. |
| WLAN Modules | MP3 Players |
Use Scenario: Regulating voltage for 2.4GHz RF transceivers and baseband processors in embedded Wi-Fi modules. IC Role / Device Role / Timing Role: Noise-suppressing post-regulator isolating RF section from noisy system power rails. Use Value: 180mV dropout allows direct regulation from 5V USB input while maintaining margin for brownout. |
Use Scenario: Powering DACs, headphone amplifiers, and flash memory controllers in portable audio players. IC Role / Device Role / Timing Role: Precision 4.75V supply for audio reconstruction filters and low-jitter clock buffers. Use Value: 65µA quiescent current minimizes battery drain during pause/play transitions and standby states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP2125K-4.75TRG1 | Same 4.75V output, 300mA rating, but uses N-MOS pass device with higher dropout (~350mV @ 300mA); no BYP pin | Lacks bypass pin for noise filtering; less suitable for ultra-low-noise audio paths | Select when cost sensitivity outweighs PSRR requirements and board space permits larger dropout margin |
| MCP1700T-47502E/TT | 4.75V output, 250mA max, 6µA IQ, but only 100mV dropout at 250mA; no thermal shutdown | No integrated thermal protection-requires external monitoring in high-ambient or high-power scenarios | Prefer for ultra-low-power sensor nodes where thermal stress is negligible and 250mA suffices |
Compared with AP2125K-4.75TRG1 and MCP1700T-47502E/TT, the PAM3101AAA475 delivers superior PSRR and integrated thermal/current protection at the expense of slightly higher quiescent current than the MCP1700, making it optimal for noise-critical, fault-tolerant portable designs.
Availability
PAM3101AAA475 is available at Aetrix Electronics and suitable for Bluetooth earphones, digital cameras, and WLAN modules requiring stable component supply with guaranteed long-term manufacturability and traceable sourcing.
Supply support for PAM3101AAA475 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-reliability power management, signal integrity, and protection solutions for consumer, industrial, and computing markets.
The PAM3101 belongs to Diodes' high-PSRR, low-IQ LDO family engineered specifically for battery-powered portable electronics where noise suppression, efficiency, and small-footprint integration are critical.
FAQ
Is the PAM3101AAA475 pin-compatible with other PAM3101 variants?
No-the AAA475 suffix denotes SOT-23-3 package with GND/VOUT/VIN pinout (Type A). Other variants (e.g., Type B/C/D) have different pin counts and configurations including EN and BYP pins. Substituting packages without verifying pin mapping risks functional failure or damage.
What output capacitor value and type are required for stability?
The PAM3101AAA475 is stable with ≥2.2µF ceramic output capacitors having ESR >5mΩ. X5R or X7R dielectrics are recommended. Tantalum or aluminum electrolytic capacitors are not supported due to ESR and aging characteristics that may compromise loop stability.
Does the PAM3101AAA475 include an enable (EN) function?
No-this variant (AAA475) is the Type A SOT-23-3 configuration with only VIN, VOUT, and GND pins. Enable functionality is available only in 5-pin or 6-pin versions (e.g., PAM3101BAB475 or PAM3101FAF475) and is not implemented in this part number.
Can the PAM3101AAA475 be used with input voltages below 2.5V?
No-the absolute minimum input voltage is defined by VO + VDROP. For 4.75V output and typical 180mV dropout, VIN must be ≥4.93V. The 2.5V lower limit in datasheet refers to minimum specification test condition-not operational capability-and cannot be applied to this output voltage grade.
PAM3101AAA475 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 4.75V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.23V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 90 µA
- Current - Supply (Max):
- 90 µA
- PSRR:
- 70dB ~ 65dB (100Hz ~ 1kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
PAM3101AAA475 FAQ
1.How can I place an order for PAM3101AAA475 through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM3101AAA475 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 PAM3101AAA475 reliable?
The price and inventory of PAM3101AAA475 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM3101AAA475 is usually 5 days.
3.What payment methods are accepted for PAM3101AAA475?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM3101AAA475 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM3101AAA475?
PAM3101AAA475 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM3101AAA475 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 PAM3101AAA475?
For technical support, including PAM3101AAA475 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM3101AAA475 requirements.
6.How does Aetrix verify that PAM3101AAA475 is sourced from the original manufacturer or authorized distributors?
All PAM3101AAA475 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 PAM3101AAA475 meets industry standards.
7.What is the process for return or replacement of PAM3101AAA475?
All PAM3101AAA475 units undergo pre-shipment inspection (PSI). If there is an issue with PAM3101AAA475, 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 PAM3101AAA475 part is unused and in its original packaging.
Return procedure for PAM3101AAA475:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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