Analog Devices Inc./Maxim Integrated DG308ACY+T

Overview

DG308ACY+T from Maxim Integrated is a quad SPST analog switch with normally open (NO) configuration, designed for signal routing in precision analog systems. It delivers 60Ω typical on-resistance, <130ns turn-on time, and supports ±5V to ±20V dual supplies or +5V to +30V single supply, enabling use in sample-and-hold circuits and test equipment.

For engineers reviewing the DG308ACY+T datasheet, DG308ACY+T pinout, DG308ACY+T application, or DG308ACY+T equivalent, key selection criteria include analog voltage range (±15V), off-isolation (78dB), channel leakage (<100pA), and CMOS-compatible logic inputs with sub-1µA input current.

Technical Context

The DG308ACY+T implements monolithic low-power CMOS architecture with substrate-connected V+ pin, enabling robust analog switching across wide supply ranges. Its four independent NO switches feature matched rDS(ON) tracking and low charge injection (–10pC), critical for minimizing sampling errors in data acquisition paths.

It operates with rail-to-rail analog signal handling up to ±15V when powered by ±15V supplies, and maintains CMOS logic compatibility (VIH = 3.5V, VIL = 11V) regardless of supply configuration-ensuring interoperability with microcontrollers and FPGAs without level-shifting.

Key Specifications

Pinout & Package

Package: 16-pin narrow SOIC (SO) with gull-wing leads, 1.27mm pitch, body width 3.9mm, compliant with JEDEC MS-012.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog switch applications.

Compared with ADG1404BRUZ and TS5A3157DCKR, the DG308ACY+T uniquely supports ±20V dual supplies and +30V single supply while delivering 60Ω rDS(ON) and 78dB off-isolation - making it the only option among the three qualified for high-voltage, wide-temperature, and high-isolation analog multiplexing.

Availability

DG308ACY+T is available at Aetrix Electronics and suitable for test equipment, communications systems, military radios, and sample-and-hold circuits requiring stable component supply across extended temperature and high-voltage analog signal paths.

Supply support for DG308ACY+T 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

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.

The DG308ACY+T belongs to Maxim's legacy analog switch product line, engineered specifically for high-fidelity signal routing in demanding test, measurement, and defense systems where voltage range, isolation, and temperature stability are critical.

FAQ

What is the maximum analog signal voltage the DG308ACY+T can switch?

The DG308ACY+T supports an analog signal range of ±15V when operated with ±15V supplies. Its absolute maximum rating is +44V on V+, allowing safe blocking of 30V peak-to-peak signals. Operation outside the supply rails (e.g., analog signals exceeding V+ or falling below V−) is prohibited and may cause permanent damage to the DG308ACY+T.

Does the DG308ACY+T require dual supplies, or can it operate from a single supply?

The DG308ACY+T supports both configurations: dual supplies (±5V to ±20V) and single positive supply (+5V to +30V). In single-supply mode, the analog range is 0V to V+, and logic inputs remain CMOS-compatible. However, switching speed degrades slightly and rDS(ON) increases compared to dual-supply operation - a trade-off documented in the DG308ACY+T datasheet.

What is the function of Pin 12 (N.C.) on the DG308ACY+T?

Pin 12 on the DG308ACY+T is a no-connect terminal - it is not internally bonded and serves no electrical function. It must remain unconnected in PCB layout to prevent unintended coupling or contamination effects. This pin is explicitly designated as N.C. in Maxim's official pin description table for the DG308ACY+T.

How does the DG308ACY+T achieve 78dB off-isolation?

The DG308ACY+T achieves 78dB off-isolation through optimized CMOS transistor geometry, guard-ring isolation, and substrate biasing via the V+ pin. This specification is measured at 500kHz with 2Vpp input, 75Ω load, and reflects suppression of signal coupling from source to drain when the switch is open - a key parameter verified in the DG308ACY+T's Electrical Characteristics table.

Is the DG308ACY+T pin-compatible with other variants like DG308ACJ or DG308ACK?

Yes - the DG308ACY+T shares identical pinout and footprint with DG308ACJ (16-pin DIP) and DG308ACK (16-pin CERDIP), as all belong to the same DG308A family and conform to the standard 16-pin analog switch layout. Differences lie solely in package type and temperature grade; the DG308ACY+T is rated for 0°C to +70°C and uses narrow SOIC packaging.