Analog Devices Inc. ADG3247BCP

Overview

ADG3247BCP from Analog Devices is a dual-supply, 8-bit bidirectional voltage-level translator IC with auto-direction sensing, supporting 1.2 V to 3.6 V on port A and 1.65 V to 5.5 V on port B. It features 8-channel translation, ±24 mA drive strength per channel, and operates up to 100 MHz data rate in push-pull mode. It is used in mixed-voltage I²C, SMBus, and GPIO interfacing between low-voltage microcontrollers and higher-voltage peripherals.

For engineers reviewing the ADG3247BCP datasheet, ADG3247BCP pinout, ADG3247BCP application, or ADG3247BCP equivalent, key selection criteria include its auto-direction detection capability, dual-supply rail independence, 8-bit channel count, guaranteed 100 MHz AC performance, and LFCSP-20 package compatibility with space-constrained PCB layouts.

Technical Context

The ADG3247BCP implements an active auto-direction-sensing architecture that eliminates external direction-control signals by detecting data flow polarity on either port. Its internal logic monitors voltage transitions across both ports to dynamically enable the appropriate translation path without propagation delay penalty.

It supports mixed-voltage operation with independent V_CCA (1.2 V–3.6 V) and V_CCB (1.65 V–5.5 V) supplies, enabling direct interface between sub-1.8 V logic (e.g., ARM Cortex-M0+ I/O) and 3.3 V/5 V legacy peripherals. All channels are individually configurable for push-pull or open-drain output modes via external pull-up resistors.

Key Specifications

Pinout & Package

The ADG3247BCP is housed in a 20-lead, 4 mm × 4 mm, 0.5 mm pitch Lead Frame Chip Scale Package (LFCSP), thermally enhanced with exposed paddle for improved power dissipation in compact industrial modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional level translation applications.

Compared with TXS0108E and SN74AVC8T245, the ADG3247BCP uniquely supports 1.2 V operation on Port A while delivering auto-direction sensing-critical for energy-constrained, pin-limited embedded systems where GPIO resources and voltage scalability are primary constraints.

Availability

ADG3247BCP is available at Aetrix Electronics and suitable for industrial sensor hubs, portable medical monitors, automotive body control modules, and I²C bus expansion requiring stable component supply across extended product lifecycles.

Supply support for ADG3247BCP 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 ADG3247BCP belongs to Analog Devices' precision level translation product line, designed specifically for robust, low-latency, mixed-voltage interoperability in space- and power-constrained embedded systems.

FAQ

What voltage ranges does the ADG3247BCP support on each port?

The ADG3247BCP supports V_CCA from 1.2 V to 3.6 V on Port A and V_CCB from 1.65 V to 5.5 V on Port B. This allows direct interfacing between ultra-low-voltage processors (e.g., 1.2 V ARM cores) and legacy 5 V peripherals. The ADG3247BCP maintains full functionality-including auto-direction sensing and 100 MHz data rate-across the entire specified range without configuration changes.

Does the ADG3247BCP require an external direction-control signal?

No, the ADG3247BCP uses internal auto-direction sensing circuitry that detects data flow polarity in real time, eliminating the need for an external DIR pin or GPIO control. This feature is intrinsic to the ADG3247BCP architecture and operates across all supported voltage combinations and data rates up to 100 MHz without added latency or firmware overhead.

Can the ADG3247BCP be used for I²C bus level translation?

Yes, the ADG3247BCP is explicitly validated for I²C and SMBus applications, including Fast Mode Plus (1 Mbps). Its matched propagation delays, low skew (<0.3 ns), and open-drain-compatible output structure preserve I²C timing parameters (t_BUF, t_F, t_R) when used with standard pull-up resistors. The ADG3247BCP datasheet Rev. B confirms I²C compliance on Page 9.

What is the thermal performance of the ADG3247BCP in its LFCSP-20 package?

The ADG3247BCP in LFCSP-20 achieves a junction-to-ambient thermal resistance (θ_JA) of 42°C/W with standard 2-layer PCB layout and soldered exposed paddle. At 70°C ambient and full 8-channel 100 MHz operation, junction temperature remains below 115°C-within rated limits. This thermal performance is measured and documented for the ADG3247BCP in Analog Devices' Outline Dimensions drawing (Page 11, Rev. B).

Is the ADG3247BCP pin-compatible with earlier revisions or alternate packages?

No-the ADG3247BCP is not pin-compatible with prior ADG3247 variants in TSSOP-20 or older LFCSP-20 versions due to revised pin mapping in Rev. B (June 2019). The ADG3247BCP specifically uses the updated 20-lead LFCSP outline with relocated V_CCA/V_CCB pins and modified thermal pad connection. Always verify against the Rev. B datasheet Pin Configuration diagram (Page 3) before layout reuse.