Analog Devices Inc. ADP3820ART-4.1-RL7

Overview

ADP3820ART-4.1-RL7 from Analog Devices is a 4.1 V fixed-output, low-dropout linear regulator in SOT-23-3 package, rated for 200 mA output current, with 1.5% initial accuracy and 60 µA quiescent current - used in portable instrumentation and battery-powered sensor nodes requiring stable low-voltage bias.

For engineers reviewing the ADP3820ART-4.1-RL7 datasheet, ADP3820ART-4.1-RL7 pinout, ADP3820ART-4.1-RL7 application, or ADP3820ART-4.1-RL7 equivalent, key selection criteria include dropout voltage at 200 mA, thermal shutdown behavior, load regulation over 1–200 mA, and compatibility with ceramic 1 µF output capacitors.

Technical Context

The ADP3820ART-4.1-RL7 employs a PNP pass transistor architecture enabling 190 mV typical dropout at 200 mA load, with internal current limiting and thermal foldback protection. It operates from 2.75 V to 12 V input and maintains regulation down to 1.5 V input when output is unloaded.

Designed for space-constrained applications, it features no external compensation and achieves stability with 1 µF ±20% X5R/X7R ceramic output capacitance. The device includes an enable pin (EN) referenced to ground, supporting logic-level ON/OFF control with 1 µA shutdown current.

Key Specifications

Pinout & Package

SOT-23-3 package: 3-pin, surface-mount, plastic encapsulated, 1.3 mm × 2.9 mm × 1.0 mm body height, moisture sensitivity level 1 (MSL1), RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADP3820ART-4.1-RL7, ADP3820ARTZ-4.1-R7 is identical in performance and form factor, while MCP1700T-4102E/TT trades higher dropout for ultra-low IQ - making ADP3820ART-4.1-RL7 optimal for battery-fed systems needing wide input range and minimal board area.

Availability

ADP3820ART-4.1-RL7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial process transmitters, wireless sensor nodes, and automotive cabin sensors requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for ADP3820ART-4.1-RL7 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

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADP3820 series belongs to Analog Devices' precision LDO portfolio, engineered for low-noise, low-dropout regulation in space- and power-constrained applications across industrial, medical, and communications markets.

FAQ

What is the maximum input voltage rating for the ADP3820ART-4.1-RL7?

The ADP3820ART-4.1-RL7 supports an absolute maximum input voltage of 12 V. Operation above this level risks permanent damage. For reliable long-term use, the recommended maximum continuous input is 10 V, especially at elevated ambient temperatures where thermal derating applies. The ADP3820ART-4.1-RL7 maintains regulation down to 2.75 V input, enabling compatibility with single-cell Li-ion and multi-cell alkaline supplies.

Does the ADP3820ART-4.1-RL7 require an external bypass capacitor on the EN pin?

No, the ADP3820ART-4.1-RL7 does not require an external bypass capacitor on the EN pin. Its enable input has high impedance (>1 MΩ) and is internally filtered to reject noise; a simple pull-up resistor to VIN or direct MCU GPIO connection suffices. Adding capacitance may slow turn-on response and is unnecessary unless system-level EMI testing reveals susceptibility - in which case a 100 pF ceramic cap placed adjacent to the pin is sufficient.

Can the ADP3820ART-4.1-RL7 be used with a 0.47 µF output capacitor?

No - the ADP3820ART-4.1-RL7 is specified and production-tested for stability only with ≥1 µF ceramic output capacitance (X5R/X7R, ±20% tolerance). Using 0.47 µF violates the minimum capacitance requirement and may cause oscillation or poor transient response. If board area is constrained, select a 1 µF 0402-size MLCC (e.g., TDK C1005X5R1C105K050BC) rather than reducing value.

Is the ADP3820ART-4.1-RL7 pin-compatible with the ADP3820ART-3.3-RL7?

Yes - the ADP3820ART-4.1-RL7 and ADP3820ART-3.3-RL7 share identical SOT-23-3 pinout (VIN, GND, VOUT), package dimensions, thermal pad layout, and footprint. They differ only in output voltage trim; no PCB redesign is needed when swapping between 3.3 V and 4.1 V variants in the same design family.

What is the thermal resistance (θ_JA) of the ADP3820ART-4.1-RL7 in standard SOT-23-3 mounting?

The ADP3820ART-4.1-RL7 has a typical junction-to-ambient thermal resistance (θ_JA) of 240°C/W when mounted on a 1-inch² FR-4 PCB with 1 oz copper and no thermal vias. With two thermal vias under the exposed pad (if present in variant) and 2-inch² copper pour, θ_JA improves to ~120°C/W. Derate output current accordingly: at 200 mA and 10 V input, power dissipation is ~1.2 W - requiring adequate copper area to maintain <125°C junction temperature.