Vishay Siliconix DG308BDJ

Overview

DG308BDJ from Vishay Siliconix is a quad single-pole single-throw (SPST) normally open analog switch fabricated in silicon gate CMOS technology, rated for ±22 V analog signal range, with 45 Ω typical on-resistance, 20 pA maximum drain on-leakage, <200 ns turn-on time, and 1 pC charge injection - used in precision sample-and-hold circuits and programmable gain amplifiers.

For engineers reviewing the DG308BDJ datasheet, DG308BDJ pinout, DG308BDJ application, or DG308BDJ equivalent, this device supports bi-directional analog signal routing in industrial instrumentation, test equipment, and communications systems where low glitching, high off-isolation (>90 dB), and extended temperature operation (–40 °C to +85 °C) are critical.

Technical Context

The DG308BDJ implements four independent SPST switches with true bi-directional conduction when on and blocking up to supply rail levels when off. Its internal epitaxial layer prevents latchup, and an improved charge injection compensation design minimizes switching transients during signal acquisition.

It operates from dual supplies (±4 V to ±22 V) or single supply (4 V to 44 V), accepts CMOS-compatible logic inputs (VINH ≥ 11 V, VINL ≤ 3.5 V), and maintains stable RDS(on) matching (ΔRDS(on) ≤ 2 %) across channels - enabling precise channel-to-channel signal integrity in multiplexed data acquisition paths.

Key Specifications

Pinout & Package

DG308BDJ is housed in a 16-pin plastic DIP (Dual-In-Line) package per JEDEC MS-012, with 0.300-inch body width, 0.100-inch lead pitch, and through-hole mounting compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DG308BDJ, MAX308CPD offers broader temperature capability but higher on-resistance, while ADG408BNZ improves conduction loss at the cost of increased switching transients and incompatible packaging - making DG308BDJ optimal for cost-sensitive industrial DIP-based designs requiring balanced performance.

Availability

DG308BDJ is available at Aetrix Electronics and suitable for industrial instrumentation, automated test equipment, and communications infrastructure requiring stable component supply across long production lifecycles.

Supply support for DG308BDJ 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

Vishay Siliconix is a global semiconductor manufacturer specializing in discrete MOSFETs, diodes, optoelectronics, and analog switches - known for high-reliability, process-controlled silicon gate CMOS technologies.

The DG308B series belongs to Vishay's precision analog switch product line, designed specifically for high-fidelity signal routing in test, measurement, and industrial control systems where low leakage, low distortion, and rail-to-rail operation are mandatory.

FAQ

What is the maximum analog signal voltage supported by DG308BDJ?

DG308BDJ supports analog signals from V− to V+, with absolute maximum ratings allowing ±22 V supply rails - meaning it can handle analog inputs spanning –22 V to +22 V when biased accordingly. The guaranteed analog signal range is ±15 V at ±15 V supplies, per specification table on page 3 of Document Number 70047.

Does DG308BDJ require separate logic and analog grounds?

DG308BDJ uses a single GND pin (pin 9) for both logic reference and substrate bias; it does not isolate logic and analog grounds internally. Best practice is to tie GND to the system's clean digital ground plane and maintain separation from noisy analog return paths via star grounding or split-plane techniques to avoid coupling noise into analog paths.

Can DG308BDJ operate from a single 12 V supply?

Yes, DG308BDJ supports single-supply operation from 4 V to 44 V. At V+ = 12 V and V− = 0 V, its analog signal range is 0 V to 12 V, on-resistance rises to 90 Ω typ., and turn-on time increases to 300 ns - all specified in the "Single Supply" section of the datasheet (page 4, Document Number 70047).

What is the function of the NC pin (pin 15) on DG308BDJ?

Pin 15 on DG308BDJ is a no-connect terminal - it is not bonded internally and serves no electrical function. Vishay recommends leaving it unconnected (floating); however, grounding it may reduce noise pickup in high-EMI environments, provided no additional capacitance is introduced that could affect adjacent pins.

How does DG308BDJ differ from the older DG308A version?

DG308BDJ is an improved revision over DG308A, featuring lower on-resistance (45 Ω vs. 65 Ω typ.), lower leakage (20 pA vs. 100 pA max.), faster switching (<200 ns vs. <300 ns), and reduced charge injection (1 pC vs. 5 pC) - all achieved via Vishay Siliconix' enhanced silicon gate CMOS process and optimized charge compensation design.