Analog Devices Inc./Maxim Integrated DG309DY+

Overview

DG309DY+ from Maxim Integrated is a quad SPST analog switch with normally closed (NC) configuration, designed for precision signal routing in bipolar or single-supply systems. It delivers 60Ω typical on-resistance, <120ns turn-on time, <90ns turn-off time, and supports ±5V to ±20V dual supplies or +5V to +30V single supply - used in military radios and guidance systems where reliable analog path control is critical.

For engineers reviewing the DG309DY+ datasheet, DG309DY+ pinout, DG309DY+ application, or DG309DY+ equivalent, key selection criteria include its NC logic behavior, 44V breakdown rating, CMOS-compatible inputs, leakage performance below 100pA at +25°C, and SO-16 narrow-body package compatibility with high-density PCB layouts.

Technical Context

The DG309DY+ implements monolithic CMOS switch architecture with substrate-isolated P-channel and N-channel MOSFETs per channel, enabling rail-to-rail analog signal handling up to ±15V when biased with split supplies. Its CMOS input stage draws <1µA at +25°C and tolerates input voltages from (V− −2V) to (V+ +2V), supporting direct interfacing with microcontroller GPIOs.

Each of the four independent SPST switches exhibits matched on-resistance flatness (<15Ω variation across ±10V analog range), low charge injection (±10pC), and off-isolation of 78dB at 500kHz - critical for sample-and-hold accuracy and low-crosstalk multiplexing in test equipment.

Key Specifications

Pinout & Package

Package: 16-pin narrow SOIC (SO-16N), body width 3.9mm, lead pitch 0.050", RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG409BRZ and TS5A3157DCKR, the DG309DY+ uniquely balances quad integration, extended temperature capability, 44V robustness, and ±15V analog range - making it irreplaceable in ruggedized communications and defense electronics where single-part reliability is mandatory.

Availability

DG309DY+ is available at Aetrix Electronics and suitable for military radios, guidance and control systems, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DG309DY+ 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 demanding industrial, automotive, and defense applications.

The DG309DY+ belongs to Maxim's legacy high-voltage analog switch product line, engineered specifically for mission-critical signal routing where reliability under voltage stress, temperature extremes, and long-term parametric stability are non-negotiable.

FAQ

What is the logic behavior of DG309DY+ compared to DG308A?

The DG309DY+ is a normally closed (NC) quad SPST switch: each channel conducts when its corresponding INx input is logic low. In contrast, DG308A is normally open (NO) - conducting only when INx is high. This complementary pairing allows designers to implement fail-safe or default-path routing without external inverters. The DG309DY+ truth table is explicitly defined in Maxim's 19-3926 datasheet Figure 1.

Can DG309DY+ operate from a single +12V supply while switching ±5V analog signals?

No - the DG309DY+ requires both V+ and V− supplies referenced to the analog signal range. For ±5V analog signals, a minimum ±5V dual supply is mandatory. Single-supply operation (e.g., +12V and GND) only supports 0V to +12V analog signals. Attempting to switch signals outside the V− to V+ rails risks latch-up or permanent damage, as confirmed by Absolute Maximum Ratings in the DG309DY+ datasheet.

What is the maximum allowable voltage difference between V+ and V− for DG309DY+?

The DG309DY+ has a maximum V+ to V− rating of +44V, as stated in the Absolute Maximum Ratings table. This means V+ may be as high as +44V above V− (e.g., V+ = +44V, V− = 0V) or V− as low as −44V below V+ (e.g., V+ = 0V, V− = −44V). Exceeding this differential - even momentarily - risks irreversible junction breakdown, per Maxim's 19-3926 Rev 0 specification.

Does DG309DY+ require external pull-up or pull-down resistors on its logic inputs?

No - the DG309DY+ logic inputs (IN1–IN4) have CMOS-compatible thresholds with no internal pull resistors, and input leakage is specified at ±1µA max. External biasing is only needed if the driving source is high-impedance or open-drain; standard microcontroller GPIOs (with ~20mA drive strength) interface directly. This is verified in the Electrical Characteristics table under I_INL and I_INH parameters.

Is the N.C. pin (Pin 12) required to be grounded or left floating on DG309DY+?

Pin 12 is a true No Connect: it is not bonded internally and must be left unconnected - neither grounded nor routed. Maxim's Pin Description table explicitly states "No Connect. Not internally connected." Soldering or tying Pin 12 to any net may cause mechanical stress or unintended coupling; the DG309DY+ SO-16N layout guidelines prohibit any trace or via on this pad.