Vishay Siliconix 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 ±15V analog signal range - enabling use in military radios and guidance systems requiring robust channel isolation and low charge injection.

For engineers reviewing the DG309DY datasheet, DG309DY pinout, DG309DY application, or DG309DY equivalent, key selection criteria include NC logic behavior, -40°C to +85°C industrial temperature rating, SO-16 narrow-body package compatibility, and verified 78dB off-isolation at 500kHz - critical for sample-and-hold and PBX switching integrity.

Technical Context

The DG309DY implements monolithic CMOS architecture with substrate-connected V+ pin, supporting dual-supply operation (±5V to ±20V) or single positive supply (+5V to +30V) while maintaining CMOS-input compatibility. Its NC topology ensures default conduction path closure without control signal activation.

Each of the four independent channels exhibits matched rDS(ON) tracking across voltage rails, with leakage currents limited to ±100nA at TMAX and charge injection ≤10pC - essential for minimizing settling error in programmable-gain amplifier front-ends and test equipment multiplexing.

Key Specifications

Pinout & Package

Package: 16-pin Narrow SO (Small Outline), 3.9mm body width, JEDEC MS-012AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG409BRZ and TS5A3157DCKR, DG309DY uniquely balances quad integration, wide supply adaptability (+5V to ±20V), and industrial temperature range - making it optimal for consolidated routing in field-deployable communications hardware where supply architecture varies.

Availability

DG309DY is available at Aetrix Electronics and suitable for military radios, guidance and control systems, and PBX infrastructure requiring stable component supply across extended temperature 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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The DG309DY belongs to Maxim's legacy analog switch product line, engineered specifically for high-reliability signal routing in defense, test, and telecom infrastructure where NC default state, wide supply tolerance, and leakage immunity are mandatory.

FAQ

What is the default state of DG309DY channels when no logic signal is applied?

The DG309DY features a normally closed (NC) architecture, meaning all four SPST switches conduct by default when IN1–IN4 are at logic low (0V). This fail-safe behavior ensures signal continuity during power-up, reset, or controller failure - a critical requirement in military radio audio paths and guidance system sensor feeds where open-circuit interruption is unacceptable. DG309DY maintains this NC state until a valid high-level control signal is asserted.

Can DG309DY operate from a single +12V supply while switching ±10V analog signals?

No - DG309DY cannot switch analog signals beyond its supply rails. With a single +12V supply, the analog range is limited to 0V to +12V. To handle ±10V signals, DG309DY requires dual supplies (e.g., V+ = +15V, V− = −15V) to establish symmetric rails. The datasheet explicitly states "analog voltage should not go above or below the supply voltages," and DG309DY's absolute maximum rating of ±44V applies only to breakdown, not operational range. Using DG309DY with ±10V signals demands proper dual-rail biasing.

How does DG309DY's charge injection affect sample-and-hold accuracy?

DG309DY's charge injection is specified at ≤10pC, which directly translates to hold-step error in sample-and-hold circuits. For example, with a 0.01µF hold capacitor, the resulting voltage glitch is ≤1mV - sufficient for 12-bit accuracy (LSB = 2.44mV at 10V full scale). This performance is validated in Maxim's Typical Operating Characteristics (TOC03), showing <5pC injection at mid-rail analog voltages. DG309DY's low charge injection eliminates need for trimming networks in precision data acquisition modules.

Is DG309DY pin-compatible with DG308A series devices?

Yes - DG309DY shares identical pinout, package (16-pin Narrow SO), and footprint with DG308A variants (e.g., DG308ADY), differing only in logic polarity: DG308A is normally open (NO), DG309DY is normally closed (NC). This allows direct PCB substitution in existing layouts when NC behavior is required, provided control logic is inverted. No trace modifications or land pattern changes are needed - confirmed by Maxim's Pin Configuration diagram and Ordering Information table showing identical pin assignments for both families.

What is the maximum peak current DG309DY can sustain per channel during pulsed operation?

DG309DY supports 70mA peak current per S/D terminal under pulsed conditions (1ms pulse width, ≤10% duty cycle), as specified in Absolute Maximum Ratings. This capability enables brief overcurrent events such as relay coil discharge suppression or ESD transient clamping in military radio front-ends. However, continuous current must remain ≤20mA per channel to avoid thermal runaway. DG309DY's 70mA pulse rating exceeds standard analog switch specifications and is validated across the full -40°C to +85°C operating range.