Texas Instruments ISOW7844DWE

Overview

ISOW7844DWE from Texas Instruments is a reinforced quad-channel digital isolator with integrated 5-V-to-5-V DC-DC converter, delivering up to 130 mA isolated output current, 100 Mbps data rate, and 5000 VRMS isolation rating in a 16-pin wide SOIC package. It enables compact isolated power + signal interfaces in industrial motor drives and medical sensing systems.

For engineers reviewing the ISOW7844DWE datasheet, ISOW7844DWE pinout, ISOW7844DWE application, or ISOW7844DWE equivalent, key selection criteria include its 5-V primary/5-V secondary configuration, default-low output logic, ±100 kV/µs CMTI, and VDE/UL/CSA/TUV safety certifications for reinforced insulation.

Technical Context

The ISOW7844DWE implements four unidirectional signal channels with all inputs on the isolated (secondary) side and all outputs on the primary side - a reverse-direction topology optimized for isolated feedback or sensor readout. Its integrated transformer-based DC-DC converter uses thin-film polymer insulation and supports soft-start, overload protection, and thermal shutdown.

Signal isolation employs dual capacitive SiO₂ barriers per channel, achieving >100-year lifetime at 1 kVRMS working voltage and ±8 kV IEC 61000-4-2 contact ESD across the barrier. The SEL pin configures VISO to 5 V (SEL tied to VISO) or 3.3 V (SEL grounded or floating), though ISOW7844 is specified for 5-V-to-5-V operation with ≥130 mA load capability.

Key Specifications

Pinout & Package

Package: 16-pin Wide SOIC (DWE), body size 10.30 mm × 7.50 mm, creepage/clearance >8 mm, reinforced insulation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel isolated power + signal applications.

Compared with ISOW7844DWE, ADUM6420ARWZ offers lower isolated power and fewer safety certifications, while SI88642ED-IS requires external magnetics and lacks integrated protection features-making ISOW7844DWE optimal for compact, certified, turnkey isolated power+signal designs.

Availability

ISOW7844DWE is available at Aetrix Electronics and suitable for industrial motor control, medical patient monitoring, grid-tied energy storage, and test & measurement equipment requiring stable component supply and long-lifecycle assurance.

Supply support for ISOW7844DWE 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability ICs for industrial, automotive, and medical markets.

The ISOW784x product line delivers integrated signal + power isolation to simplify design of compact, certified isolated interfaces-targeting applications where space, safety compliance, and EMI robustness are critical.

FAQ

What is the default output state of ISOW7844DWE during power-up or signal loss?

The ISOW7844DWE features a default-low output configuration. When input signals (INA–IND) are lost or during power-up sequencing, all four outputs (OUTA–OUTD) assert logic low. This fail-safe behavior ensures controlled shutdown of downstream actuators or gate drivers in safety-critical systems, and is confirmed in the device's Pin Functions table and Section 5 description of ISOW784x F-suffix variants.

Can ISOW7844DWE be used in 3.3-V input systems?

Yes, ISOW7844DWE supports 3-V to 5.5-V primary supply (VCC), enabling direct interface with 3.3-V microcontrollers. However, its fixed 5-V-to-5-V channel configuration means the isolated side (VISO) remains 5 V regardless of VCC level. For 3.3-V isolated logic, TI recommends ISOW7841 or ISOW7843 variants instead of ISOW7844DWE.

Does ISOW7844DWE require external components for DC-DC stability?

Yes, ISOW7844DWE requires external input and output capacitors per Section 11 of the datasheet. A minimum 10 µF ceramic capacitor is required between VCC and GND1, and a minimum 22 µF ceramic capacitor between VISO and GND2. Larger values (e.g., 100 µF input) improve ripple suppression but are optional. No external inductors or transformers are needed-the transformer is fully integrated.

How does the SEL pin function on ISOW7844DWE?

On ISOW7844DWE, the SEL pin selects VISO output voltage: tying SEL to VISO sets VISO = 5 V; tying SEL to GND2 or leaving it floating sets VISO = 3.3 V. However, ISOW7844 is characterized and rated for 5-V-to-5-V operation (≥130 mA load), so 5-V VISO configuration is mandatory to meet datasheet specifications. Using 3.3-V VISO invalidates the 130 mA rating.

What safety certifications apply specifically to ISOW7844DWE?

ISOW7844DWE carries VDE certification per DIN V VDE V 0884-11:2017-01 (7071 VPK reinforced), UL 1577 (5000 VRMS), CSA per IEC 62368-1 and IEC 60601-1 (2 MOPP), CQC per GB4943.1-2011, and TUV per EN 61010-1 and EN 60950-1. All certifications are explicitly listed for the ISOW7844 device in Section 7.7 and the Device Information table.