Analog Devices Inc./Maxim Integrated DG405DJ

Overview

DG405DJ from Maxim Integrated is a dual, high-speed, normally open analog switch IC designed for precision signal routing in bipolar or single-supply systems. It features guaranteed 2Ω max on-resistance matching between channels, 3Ω max on-resistance flatness over ±15V signal range, and 15pC max charge injection - enabling low-distortion sampling in test equipment and military radios. The device operates from ±4.5V to ±20V or +10V to +30V supplies and delivers 150ns max tON / 100ns max tOFF switching.

For engineers reviewing the DG405DJ datasheet, DG405DJ pinout, DG405DJ application, or DG405DJ equivalent, key selection criteria include rail-to-rail analog signal handling (±15V), TTL/CMOS logic compatibility with separate VL pin, low off-leakage (<5nA at +85°C), and 20-pin LCC package thermal performance across -40°C to +85°C industrial operation.

Technical Context

The DG405DJ implements two independent SPST (single-pole/single-throw) analog switches with complementary control logic: IN1 controls S1/D1, IN2 controls S2/D2. Each switch conducts bidirectionally with matched rDS(ON) and flat on-resistance across the full analog range, critical for precision sample-and-hold circuits where channel-to-channel gain error must be minimized.

Its silicon-gate 44V process enables robust ±20V bipolar operation while maintaining sub-100ns switching transitions and <39pF channel-on capacitance. Internal substrate connection to V+ and discrete N.C. pins (pins 2, 7, 11, 16 in SO package) isolate digital and analog domains, supporting low-crosstalk (<90dB) and high off-isolation (72dB at 1MHz) in dense PCB layouts.

Key Specifications

Pinout & Package

DG405DJ is supplied in a 16-pin narrow SOIC package (width = 3.9mm) with standard JEDEC MS-012AC footprint. Pin 1 is located at the top-left corner with notch or dot marking; pin numbering proceeds counterclockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DG405DJ, ADG1419BRUZ offers lower on-resistance but lacks guaranteed rDS(ON) matching and bipolar supply support, while TS5A23157DCKR provides superior charge injection yet cannot handle rail-to-rail ±15V signals - making DG405DJ uniquely suited for high-fidelity, wide-range analog switching in harsh environments.

Availability

DG405DJ is available at Aetrix Electronics and suitable for test equipment, guidance and control systems, military radios, sample-and-hold circuits, and battery-operated systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for DG405DJ 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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.

The DG405DJ belongs to Maxim's legacy DG40x family of precision analog switches, engineered specifically for high-reliability signal routing in military, aerospace, and test instrumentation applications demanding guaranteed matching, low leakage, and wide supply flexibility.

FAQ

What is the maximum analog signal voltage range supported by the DG405DJ?

The DG405DJ supports an analog signal range from V− to V+, guaranteed up to ±15V with ±20V absolute maximum supply ratings. This rail-to-rail capability allows direct interfacing with op-amps and ADCs operating at supply rails without attenuation or level-shifting, preserving signal fidelity in precision measurement paths. The DG405DJ maintains low on-resistance flatness (≤3Ω) across this full range, ensuring consistent performance regardless of signal amplitude.

Does the DG405DJ require a separate logic supply voltage (VL), and what happens if it's tied to V+?

Yes, the DG405DJ requires a dedicated VL pin for logic-level referencing - typically +5V for TTL compatibility. If VL is tied directly to V+, the device operates with CMOS-level logic thresholds instead of TTL, raising the input high threshold to ~0.7×V+. This may cause unintended switching in systems using standard 3.3V or 5V microcontroller GPIOs unless logic levels are verified. The DG405DJ datasheet specifies VL = +5V for guaranteed TTL compatibility across temperature.

How does the DG405DJ achieve low charge injection, and why is that critical in sample-and-hold circuits?

The DG405DJ achieves ≤15pC max charge injection through matched transistor geometry and optimized gate drive timing in its silicon-gate 44V process. In sample-and-hold circuits, injected charge displaces hold capacitor voltage, causing step errors and settling delays. At 15pC into a typical 1000pF hold capacitor, the DG405DJ induces <15mV glitch - well within 16-bit (≈15mV full-scale) accuracy budgets. This enables faster acquisition times and reduced post-hold correction in high-speed data loggers.

Can the DG405DJ be used in single-supply configurations, and what is the minimum positive supply voltage?

Yes, the DG405DJ supports single-supply operation from +10V to +30V, with V− connected to ground. The minimum +10V requirement ensures sufficient headroom for internal biasing and guarantees specified on-resistance, leakage, and switching speed performance. Using +9V violates the absolute minimum rating and risks increased rDS(ON), elevated off-leakage (>10nA), and degraded tON/tOFF - all of which are documented in the DG405DJ electrical characteristics table under "Power-Supply Range".

What is the thermal performance of the DG405DJ in its 16-pin narrow SOIC package?

The DG405DJ in 16-pin narrow SOIC has a thermal resistance θJA of 8.70°C/W, allowing 696mW continuous power dissipation at +70°C ambient (derated above that point). Under typical operation - with 35µW max quiescent power and negligible I²R loss due to 20Ω typical rDS(ON) - junction temperature rise remains below 1°C, ensuring stable parametric performance across the full -40°C to +85°C industrial temperature range without heatsinking or airflow.