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Diodes Incorporated PAM3101AAA400
- Part No.:
- PAM3101AAA400
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
PAM3101AAA400.pdf
- Description:
- IC REG LINEAR 4V 300MA SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,318
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Product details
Overview
PAM3101AAA400 from Diodes Incorporated is a 4.0V fixed-output, 300mA low-dropout CMOS linear regulator with 65µA quiescent current, 180mV dropout at 300mA (VO = 3.3V), and 70dB PSRR at 1kHz - designed for noise-sensitive battery-powered systems such as Bluetooth earphones and portable cameras.
For engineers reviewing the PAM3101AAA400 datasheet, PAM3101AAA400 pinout, PAM3101AAA400 application, or PAM3101AAA400 equivalent, key selection criteria include output voltage accuracy (±2%), shutdown current (0.5µA), thermal shutdown threshold (+150°C), EN pin logic (active-high), and compatibility with ≥2.2µF ceramic output capacitors.
Technical Context
The PAM3101AAA400 integrates a 0.75Ω P-channel MOSFET pass transistor enabling ultra-low ground current across load conditions. Its internal bypass (BYP) pin connects to a 10nF capacitor to form a 200kΩ–10nF RC filter that suppresses high-frequency output noise.
It operates within 2.5V–5.5V input range and delivers stable regulation with ±2% output accuracy, <30mV load transient spike (1mA→300mA), and built-in current limiting (~400mA) plus thermal shutdown at +150°C with +30°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.0V ±2% - ensures precise rail generation for 4.0V logic or analog subsystems. |
| Max Output Current | 300mA continuous - supports moderate-power peripherals like audio codecs or RF front-ends. |
| Dropout Voltage | 180mV @ 300mA (VO = 3.3V) - enables operation down to VIN = 4.18V, extending usable battery life in Li-ion/Li-poly systems. |
| PSRR | 70dB @ 1kHz - suppresses switching noise from DC-DC converters feeding the LDO input. |
| Quiescent Current | 65µA typical - minimizes standby power loss in always-on wearable sensors or BLE modules. |
| Shutdown Current | 0.01–1µA - enables deep-sleep modes with negligible battery drain during system idle. |
| Thermal Shutdown | Triggers at +150°C with +30°C hysteresis - prevents permanent damage under sustained overload or poor PCB thermal design. |
Pinout & Package
Package: SOT-23-3 (JEDEC TO-236AB); compact 2.92mm × 1.3mm footprint with exposed pad option per DFN variant - optimized for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 2.5V–5.5V; must be decoupled with ≥1µF ceramic cap within 0.5 inch of pin. |
| VOUT | Regulated output | Delivers stable 4.0V; requires ≥2.2µF ceramic capacitor (ESR >5mΩ) for stability. |
| GND | Ground reference | Common return path for input, output, and internal circuitry; critical for PSRR and noise performance. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout architecture | 180mV @ 300mA enables use with partially discharged batteries (e.g., 4.2V→3.6V Li-ion). |
| Active-high enable control | EN pin (not present in SOT-23-3 variant; this part uses A-type pinout: GND-VOUT-VIN) - device is always on unless externally disabled via alternate package. |
| Bypass-filtered noise suppression | BYP pin (in 5/6-pin variants) accepts 10nF cap to reduce output RMS noise to 50µVRMS (10Hz–100kHz). |
| Integrated protection | Current limit (~400mA), short-circuit foldback, and thermal shutdown prevent field failures under fault conditions. |
| Stable with low-ESR ceramics | No need for tantalum or electrolytic caps - reduces BOM cost and improves long-term reliability in mobile devices. |
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 4.0V analog rail regulator supplying low-noise bias to sensitive audio signal chain. Use Value: 70dB PSRR eliminates audible switching artifacts from shared PMIC input rails. |
Use Scenario: Supplying image sensor interface and ISP core voltage in sub-50mm pocket cameras. IC Role / Device Role / Timing Role: Low-quiescent LDO delivering clean 4.0V to CIS analog front-end and ADC reference. Use Value: 65µA IQ extends battery runtime during standby imaging modes without compromising wake-up latency. |
| WLAN Modules | MP3 Players |
Use Scenario: Regulating 4.0V for RF transceiver PA bias and baseband processor I/O in embedded Wi-Fi clients. IC Role / Device Role / Timing Role: Secondary LDO isolating noise-sensitive RF section from noisy digital supply domains. Use Value: 180mV dropout allows direct regulation from 4.2V Li-ion, avoiding cascaded conversion losses. |
Use Scenario: Providing stable 4.0V to flash memory controller and DAC in portable audio players. IC Role / Device Role / Timing Role: Main system rail LDO ensuring consistent playback voltage despite battery discharge curve. Use Value: ±2% output accuracy maintains consistent DAC reference and audio fidelity across full battery range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP2125K-4.0TRG1 | Same 4.0V output, 300mA rating, but uses N-MOS pass transistor → higher dropout (250mV @ 300mA) and 120µA IQ. | Larger dropout limits usable battery range; higher IQ reduces standby time in always-on wearables. | Select when cost sensitivity outweighs efficiency and noise requirements. |
| MCP1700T-4002E/TT | 4.0V, 250mA, 1.6µA IQ, but only 60dB PSRR @ 1kHz and no BYP pin for noise filtering. | Inadequate PSRR for RF/audio co-location; insufficient current for camera ISPs or WLAN PAs. | Prefer for ultra-low-power sensor nodes where noise immunity is secondary to battery life. |
Compared with AP2125K-4.0TRG1 and MCP1700T-4002E/TT, the PAM3101AAA400 delivers superior noise rejection and lower dropout in a proven SOT-23-3 footprint - making it optimal for space- and noise-constrained portable audio and imaging systems despite its "Not Recommended for New Design" status.
Availability
PAM3101AAA400 is available at Aetrix Electronics and suitable for Bluetooth earphones, digital cameras, and WLAN modules requiring stable component supply with known lifetime support and traceable sourcing.
Supply support for PAM3101AAA400 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 power management, signal integrity, and protection solutions for consumer, industrial, and communications markets.
The PAM3101 belongs to Diodes' high-PSRR, low-IQ LDO family - engineered specifically for battery-powered portable electronics where noise suppression, small size, and extended runtime are critical.
FAQ
Is the PAM3101AAA400 pin-compatible with other SOT-23-3 LDOs?
No - the PAM3101AAA400 uses Type A pinout (Pin 1: GND, Pin 2: VOUT, Pin 3: VIN), which differs from industry-standard VIN-GND-VOUT or VIN-VOUT-GND configurations. PCB layout must match this specific assignment to avoid functional failure.
What is the minimum output capacitor required for stability?
A 2.2µF ceramic capacitor with ESR >5mΩ is the minimum required for stability per the datasheet. Using smaller values or higher-ESR types (e.g., tantalum) risks oscillation and degraded transient response.
Does the PAM3101AAA400 support enable/disable control?
This SOT-23-3 variant (AAA400) has no EN pin - it operates continuously when powered. Enable functionality is only available in 5- or 6-pin packages (e.g., PAM3101BAB400 or PAM3101FAF400), where EN is active-high and defaults floating or pulled high depending on type.
Why is the PAM3101 marked "Not Recommended for New Design"?
Diodes recommends AP2125/2127 series as successors due to improved thermal performance and broader package options. However, the PAM3101AAA400 remains fully qualified, in active production, and supported for legacy designs and existing inventory reuse.
PAM3101AAA400 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):
- 4V
- 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
PAM3101AAA400 FAQ
1.How can I place an order for PAM3101AAA400 through Aetrix?
Please submit a Request for Quotation (RFQ) for PAM3101AAA400 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 PAM3101AAA400 reliable?
The price and inventory of PAM3101AAA400 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PAM3101AAA400 is usually 5 days.
3.What payment methods are accepted for PAM3101AAA400?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PAM3101AAA400 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PAM3101AAA400?
PAM3101AAA400 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PAM3101AAA400 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 PAM3101AAA400?
For technical support, including PAM3101AAA400 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PAM3101AAA400 requirements.
6.How does Aetrix verify that PAM3101AAA400 is sourced from the original manufacturer or authorized distributors?
All PAM3101AAA400 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 PAM3101AAA400 meets industry standards.
7.What is the process for return or replacement of PAM3101AAA400?
All PAM3101AAA400 units undergo pre-shipment inspection (PSI). If there is an issue with PAM3101AAA400, 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 PAM3101AAA400 part is unused and in its original packaging.
Return procedure for PAM3101AAA400:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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