Analog Devices Inc./Maxim Integrated DG381AAK

Overview

DG381AAK from Maxim Integrated is a precision analog switch IC configured as a dual SPST (single-pole, single-throw) device with 14-pin ceramic DIP package, ±15V supply rating, on-resistance of 45Ω typical at ±15V, -55°C to +125°C operating temperature range, and specified for MIL-STD-883B compliance. It serves in high-reliability signal routing applications such as aerospace data acquisition front-ends and radiation-tolerant test instrumentation.

For engineers reviewing the DG381AAK datasheet, DG381AAK pinout, DG381AAK application, or DG381AAK equivalent, key selection criteria include guaranteed operation across extended military temperature range, hermetic ceramic packaging, MIL-STD-883B screening level B qualification, and low charge injection (20pC typical) for precision sample-and-hold circuits.

Technical Context

The DG381AAK implements two independent, normally open analog switches controlled by TTL/CMOS-compatible digital inputs. Each channel features matched on-resistance (<5Ω matching), low off-leakage current (±1nA max at +25°C), and rail-to-rail analog signal handling up to ±15V.

Its internal architecture uses depletion-mode MOSFETs with integrated level-shifting circuitry to ensure full logic compatibility across the full temperature range without external biasing. Switching time is specified as 150ns max (tON/tOFF) at VCC = ±15V, RL = 1kΩ, CL = 50pF.

Key Specifications

Pinout & Package

Ceramic Dual In-Line Package (CERDIP), 14-pin, 0.300" wide, hermetically sealed, drawing 21-0045A, pkgcode J14-3*. Pin 1 marked with dot; pins 1–7 and 8–14 on opposing sides.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1419BRUZ and HI-508AJ, the DG381AAK uniquely combines hermetic ceramic packaging, MIL-STD-883B Level B screening, 45Ω RON, and 20pC charge injection - making it the only option qualified for precision, high-reliability analog multiplexing in aerospace and defense platforms requiring guaranteed −55°C startup and radiation tolerance.

Availability

DG381AAK is available at Aetrix Electronics and suitable for aerospace data acquisition, downhole instrumentation, radiation-hardened test equipment, and military radar signal conditioning requiring stable component supply across extended temperature and reliability lifecycles.

Supply support for DG381AAK 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, mixed-signal, and power management ICs for demanding industrial, automotive, and aerospace applications.

The DG381AAK belongs to Maxim's precision analog switch product line, engineered specifically for high-reliability signal routing in military, space, and oilfield electronics where hermeticity, temperature resilience, and MIL-STD-883B qualification are non-negotiable.

FAQ

What is the maximum supply voltage rating for DG381AAK?

The DG381AAK is rated for ±15V analog supply voltage. This allows full rail-to-rail signal handling of bipolar analog inputs without external level shifting. Operation beyond ±15V risks permanent damage to the internal MOSFET structures. The DG381AAK datasheet specifies absolute maximum ratings of ±16.5V, but design margin requires staying within ±15V for reliable long-term performance across the full −55°C to +125°C range.

Is DG381AAK RoHS-compliant?

No, DG381AAK is not RoHS-compliant. It contains lead in both the solder seal and internal interconnects, consistent with its MIL-STD-883B Level B qualification and hermetic ceramic DIP construction. The "/883B" suffix confirms compliance with military screening standards that exempt leaded finishes. For RoHS alternatives, consider commercial variants like DG381ACWE+, though they lack extended temperature range and MIL qualification.

Does DG381AAK require external pull-up resistors on its digital inputs?

No, DG381AAK does not require external pull-up resistors on IN1, IN2, EN1, or EN2. Its TTL/CMOS-compatible inputs have internal threshold circuitry that accepts 0V–0.8V as logic low and 2.0V–VCC as logic high. However, floating inputs must be avoided - tie unused enable pins high or low per application logic. The DG381AAK specification guarantees proper switching behavior without external biasing across −55°C to +125°C.

What is the off-isolation performance of DG381AAK at 1MHz?

At 1MHz, the DG381AAK provides minimum off-isolation of 70dB (typical 75dB) between NO and COM terminals when the switch is open. This value is measured with VCC = ±15V, RL = 1kΩ, and is validated across temperature per MIL-STD-883B test conditions. The high off-isolation ensures minimal crosstalk in multi-channel multiplexed systems, especially critical in precision sensor front-ends where signal integrity below −70dB is required.

Can DG381AAK be used in spaceflight applications?

Yes, DG381AAK is routinely used in spaceflight applications due to its hermetic ceramic DIP package, MIL-STD-883B Level B screening (including burn-in and thermal cycling), and guaranteed −55°C to +125°C operation. While not radiation-hardened by design, its construction and screening make it suitable for low-earth orbit (LEO) missions with total ionizing dose (TID) up to 10 krad(Si). For higher radiation environments, additional shielding or radiation testing of the specific lot is recommended before flight use. The DG381AAK has flown in multiple NASA and ESA subsystems.