Vishay Siliconix DG187AP

Overview

DG187AP from Vishay Siliconix is a precision single-pole, double-throw (SPDT) analog switch using JFET architecture for high-fidelity audio and video signal routing. It features 30 Ω typical on-resistance, <2 nA channel-on leakage, 85 ns turn-on time, and operates across –55 °C to +125 °C in military-grade 14-pin sidebraze packaging. It delivers break-before-make switching for telemetry and guidance systems requiring low crosstalk and flat r_DS(on) over full analog range.

For engineers reviewing the DG187AP datasheet, DG187AP pinout, DG187AP application, or DG187AP equivalent, this page provides verified electrical parameters, military temperature and radiation-hardened context, SPDT switching timing behavior, and validated alternatives for high-reliability analog signal path design.

Technical Context

The DG187AP integrates two n-channel JFETs with a TTL-compatible bipolar driver to enforce break-before-make switching-preventing channel shorting and minimizing crosstalk. Its analog signal range spans –12.5 V to +10 V under V+ = +10 V / V– = –20 V conditions, with guaranteed off-isolation >50 dB at 1 MHz into 75 Ω.

It requires four independent supplies: V+ (+10 V), V– (–20 V), VL (+5 V logic), and VR (ground reference). The device achieves low distortion via constant on-resistance and sub-2 nA ID(on) leakage, enabling accurate sample/hold and precision instrumentation applications without large-signal errors.

Key Specifications

Pinout & Package

Package: 14-pin sidebraze metal package, hermetically sealed, substrate-connected to V– and case ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DG187AP, DG187AA/883 offers identical switching performance in a compact metal-can form but sacrifices thermal headroom, while JM38510/11105BIA provides functionally identical behavior with alternate military certification documentation - both require no schematic or layout changes.

Availability

DG187AP is available at Aetrix Electronics and suitable for telemetry multiplexing, guidance system sensor management, and avionics video routing requiring stable component supply across extended temperature and radiation environments.

Supply support for DG187AP 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 designs high-reliability discrete semiconductors and analog ICs focused on precision, ruggedness, and military/aerospace qualification.

The DG187AP belongs to the DG186/187/188 family of radiation-hardened SPDT analog switches engineered specifically for guidance, telemetry, and avionics signal routing where leakage, timing accuracy, and temperature stability are mission-critical.

FAQ

What is the maximum analog signal voltage range supported by the DG187AP?

The DG187AP supports an analog signal range of –12.5 V to +10 V when operated with V+ = +10 V and V– = –20 V. This range is guaranteed across the full –55 °C to +125 °C temperature range and enables compatibility with legacy military sensor interfaces and video signal levels without external level-shifting circuitry. The DG187AP maintains low distortion and flat on-resistance throughout this span.

Does the DG187AP require all four supply rails (V+, V–, VL, VR) to operate?

Yes, the DG187AP requires four distinct supplies: V+ (positive analog), V– (negative analog, also tied to case), VL (logic +5 V), and VR (reference, typically ground). Omitting VL disables the TTL input buffer; omitting VR degrades logic threshold stability. All four rails are mandatory for specified break-before-make timing, leakage performance, and radiation-hardened operation per MIL-PRF-38535.

How does the DG187AP achieve break-before-make switching behavior?

The DG187AP achieves break-before-make switching through an integrated TTL-compatible bipolar driver that sequences the gate control of its two n-channel JFETs. Internal timing ensures the off-state of one channel is fully established before the on-state of the other begins - eliminating transient short-circuits between S1 and S2. This behavior is inherent to the DG187AP silicon design and requires no external timing components.

Is the DG187AP pin-compatible with the DG186AP or DG188AP?

No, the DG187AP is not pin-compatible with DG186AP or DG188AP. Although all three share the same 14-pin sidebraze package and pin numbering, their analog signal ranges differ significantly: DG186AP supports –7.5 V to +15 V, DG187AP –12.5 V to +10 V, and DG188AP –10 V to +15 V. Substituting without verifying supply rail compatibility risks overvoltage damage or degraded linearity in the DG187AP.

What is the meaning of "V–*" labeled on the DG187AP package diagram?

"V–*" on the DG187AP top-view diagram indicates that Pin 10 (V–) is common to both the internal negative supply node and the metal can substrate - a defining feature of the 14-pin sidebraze package. This connection provides a low-inductance thermal and EMI path, but requires the PCB mounting pad for the can to be tied to V–. Failure to do so violates the DG187AP's thermal derating curve and may cause premature failure under sustained load.