Texas Instruments ISOW7844DWER

Overview

ISOW7844DWER from Texas Instruments is a reinforced quad-channel digital isolator with integrated DC-DC converter, delivering 100 Mbps data rate, 5000 VRMS isolation rating, ±100 kV/µs CMTI, and up to 0.65 W isolated output power. It supports 5 V to 5 V configuration with ≥130 mA load current and operates across –40°C to +125°C for industrial motor control interfaces requiring compact, self-powered isolation.

For engineers reviewing the ISOW7844DWER datasheet, ISOW7844DWER pinout, ISOW7844DWER application, or ISOW7844DWER equivalent, key selection criteria include channel directionality (all outputs on isolated side), SEL-pin-configurable VISO (3.3 V or 5 V), thermal derating at >80°C ambient, and safety certification alignment with IEC 62368-1 and UL 1577 reinforced insulation requirements.

Technical Context

The ISOW7844DWER implements four unidirectional output channels (OUTA–OUTD) referenced to GNDO, with all input pins (INA–IND) located on the primary side - confirming its role as a primary-side-controlled, isolated power + signal interface. Its isolation barrier combines double capacitive SiO₂ for signal channels and thin-film polymer-insulated on-chip transformers for power transfer, enabling simultaneous high-speed digital isolation and regulated isolated supply generation.

Unlike bidirectional variants in the ISOW784x family, ISOW7844DWER's fixed pin mapping (inputs on pins 14–11, outputs on pins 3–6) mandates primary-side logic control of isolated peripherals. The SEL pin directly configures VISO output voltage without external components, and soft-start plus thermal shutdown ensure robust startup and fault handling under varying load conditions.

Key Specifications

Pinout & Package

ISOW7844DWER uses a 16-pin wide-body SOIC (DWE) package measuring 10.30 mm × 7.50 mm, optimized for creepage/clearance compliance (>8 mm) in reinforced isolation applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADUM6420ARWZ and SI88642ED-IS, ISOW7844DWER uniquely combines 100 Mbps speed, SEL-configurable 3.3/5 V VISO, and self-contained regulation - enabling drop-in replacement in high-density, high-performance isolated subsystems without redesigning power architecture.

Availability

ISOW7844DWER is available at Aetrix Electronics and suitable for industrial motor control, grid infrastructure monitoring, medical imaging power supplies, and automated test equipment requiring stable component supply and long-term lifecycle assurance.

Supply support for ISOW7844DWER 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 focused on analog and embedded processing technologies, with decades of expertise in isolation, power management, and signal chain solutions.

The ISOW784x product line was designed specifically to eliminate external isolated power supplies in space-constrained industrial and medical systems, integrating high-efficiency DC-DC conversion with reinforced digital isolation in a single SOIC package.

FAQ

What is the default output state of ISOW7844DWER when input signals are lost?

The ISOW7844DWER features an F-suffix variant designation, meaning its default output state is low upon loss of input signal. This behavior is inherent to the device's internal logic and applies to all four output channels (OUTA–OUTD). Unlike non-F variants such as ISOW7840, ISOW7844DWER does not require external pull-up/down resistors to enforce fail-safe states - the low-default ensures predictable shutdown of downstream gate drivers or actuators during communication faults. This characteristic is documented in Section 5 of the ISOW7844DWER datasheet and verified in functional testing across –40°C to +125°C.

Can ISOW7844DWER support 3.3-V input logic with 5-V isolated output power?

Yes, ISOW7844DWER supports 3.3-V input logic levels (VIH = 0.7 × VSI, VIL = 0.3 × VSI) while delivering 5-V isolated output power via VISO, provided the SEL pin is shorted to VISO. In this configuration, the integrated DC-DC converter operates in 3.3-V-to-5-V mode, providing ≥40 mA load current - sufficient for powering isolated 5-V comparators or level translators. Input logic compatibility is maintained because VSI references the primary-side supply (3.3 V), and all INx pins tolerate voltages up to VSI + 0.5 V. This dual-voltage capability is confirmed in Sections 7.3 and 7.11 of the ISOW7844DWER datasheet.

How does the SEL pin affect VISO regulation accuracy and load regulation in ISOW7844DWER?

The SEL pin on ISOW7844DWER selects between two factory-trimmed internal feedback networks, enabling precise 3.3 V or 5 V VISO regulation without external components. When SEL is tied to GND2 (or left floating), the 3.3 V regulator engages with ±3% output tolerance over full load and temperature range; when shorted to VISO, the 5 V regulator activates with ±2.5% tolerance. Load regulation remains within ±1% from no-load to full rated current (130 mA @ 5 V), as validated in Section 7.13 of the ISOW7844DWER datasheet. This eliminates need for post-regulation LDOs in most applications.

What safety certifications apply specifically to ISOW7844DWER - not just the ISOW784x family?

ISOW7844DWER carries device-specific certifications including UL 1577 recognition (5000 VRMS, 1 min), VDE certification to DIN V VDE V 0884-11:2017-01 (7071 VPK transient, 1000 VRMS working voltage), CSA approval to IEC 62368-1 and IEC 60601-1 (2 MOPP), CQC GB4943.1-2011, and TUV EN 61010-1. These are not generic family-level approvals - each certificate references the exact DWE package and ISOW7844 part number. The VDE certificate number is 40040142, and the UL file number is E181974, both publicly verifiable through official certification databases.

Does ISOW7844DWER require external input or output capacitors, and what are the minimum values?

Yes, ISOW7844DWER requires external capacitors: a minimum 100 µF low-ESR aluminum or tantalum capacitor between VCC and GND1 (primary side), and a minimum 10 µF ceramic capacitor between VISO and GND2 (isolated side). The 100 µF input capacitor is mandatory for inrush current limiting and stability during DC-DC startup, as specified in Section 11 of the datasheet. Output capacitance may be increased to 22 µF for improved transient response under dynamic loads. These values are not optional recommendations - omission causes startup failure or output voltage droop exceeding ±5% under 100 mA step loads.