Texas Instruments ISO7330CDW

Overview

ISO7330CDW from Texas Instruments is a triple-channel digital isolator with galvanic isolation up to 3000 VRMS (1 min UL) and 4242 VPK (VDE), three unidirectional channels, 25 Mbps signaling rate, and integrated noise filtering for industrial bus interfaces. It operates from 3.3 V or 5 V supplies on both input and output sides, with default low output behavior on power loss.

For engineers reviewing the ISO7330CDW datasheet, ISO7330CDW pinout, ISO7330CDW application, or ISO7330CDW equivalent, key selection criteria include channel directionality (3 forward), fail-safe output polarity, CMTI of 70 kV/μs (5 V), propagation delay of 32 ns (typ), and SOIC-16 wide-body package compatibility with reinforced insulation requirements.

Technical Context

The ISO7330CDW employs capacitive silicon dioxide (SiO₂) isolation with dual-path signal processing: a high-frequency channel (100 kbps–25 Mbps) for fast data and a low-frequency PWM-modulated channel (DC–100 kbps) for static or slow signals. Its internal decision logic automatically switches between paths based on input transition timing.

It features separate input-side (VCCI/GNDI) and output-side (VCCO/GNDO) power domains, enabling 3.3 V/5 V level translation across the barrier. The device includes integrated input noise filtering, TTL-compatible thresholds (VIH = 2 V min, VIL = 0.8 V max), and fail-safe output delay of 7 μs upon input power loss.

Key Specifications

Pinout & Package

ISO7330CDW is housed in a wide-body SOIC-16 (DW) package measuring 10.3 mm × 7.5 mm, with creepage and clearance ≥8 mm, CTI >400 V, and reinforced insulation per IEC 61010-1 and UL 1577.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital isolator applications.

Compared with ISO7330CDW, ISO7330CDWR offers identical performance in tape-and-reel format for manufacturing scalability, while ADUM1300ARWZ trades speed and noise immunity for magnetic-isolation heritage-making ISO7330CDW the preferred choice for new 25 Mbps industrial designs requiring robust EMC and fail-safe behavior.

Availability

ISO7330CDW is available at Aetrix Electronics and suitable for industrial fieldbus nodes, motor drive control interfaces, PLC I/O modules, and battery management system communication requiring stable component supply and long-term lifecycle assurance.

Supply support for ISO7330CDW 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and high-reliability components for industrial, automotive, and communications markets.

The ISO733x family was designed specifically for robust industrial isolation-emphasizing high CMTI, integrated noise filtering, fail-safe operation, and regulatory compliance for safety-critical equipment such as programmable logic controllers and motor drives.

FAQ

What is the default output state of the ISO7330CDW during input power loss?

The ISO7330CDW has a default-low output configuration. When VCCI is lost or falls below the undervoltage lockout threshold (~2.4 V), all three outputs (OUTA, OUTB, OUTC) transition to logic low within 7 μs. This fail-safe behavior is intrinsic to the 'C' suffix variant and ensures predictable shutdown in motor control or relay driver circuits where an undefined state could cause hazardous operation. The ISO7330CDW does not require external pull-down resistors to achieve this behavior.

Does the ISO7330CDW support level translation between 3.3 V and 5 V logic domains?

Yes, the ISO7330CDW supports true bidirectional level translation: VCCI can be operated at 3.3 V while VCCO is supplied at 5 V (or vice versa), with full 25 Mbps data rate maintained. Input thresholds (VIH = 2 V min, VIL = 0.8 V max) are TTL-compatible across the entire 3–5.5 V supply range, and output VOH/VOL specifications meet 5 V CMOS and 3.3 V LVTTL standards simultaneously. This capability is confirmed in the Electrical Characteristics tables for both 3.3 V and 5 V supply conditions in the ISO7330CDW datasheet.

What is the meaning of the 'DW' suffix in ISO7330CDW?

The 'DW' suffix in ISO7330CDW denotes the wide-body SOIC-16 package (10.3 mm × 7.5 mm), which provides enhanced creepage and clearance distances (≥8 mm) required for reinforced insulation in industrial and medical applications. This package meets IEC 61010-1 and UL 1577 safety standards, with minimum internal clearance (DTI) of 13 µm and comparative tracking index (CTI) >400 V. The DW package is distinct from narrower SOIC variants and is mandatory for achieving the rated 4242 VPK isolation per VDE 0884-10.

How does the ISO7330CDW handle input noise and glitches?

The ISO7330CDW incorporates an integrated input noise filter that suppresses transients shorter than 40 ns, eliminating the need for external RC filters in most industrial applications. This feature is implemented via internal capacitor-resistor networks and comparator hysteresis (VI(HYS) = 480 mV typ at 5 V), allowing reliable operation in environments with fast EFT bursts or switching noise. The filter is active on all three input channels (INA, INB, INC) and functions independently of data rate-verified across DC to 25 Mbps in the ISO7330CDW characterization data.

Can the ISO7330CDW replace optocouplers in existing designs without layout changes?

Yes, the ISO7330CDW is a direct drop-in replacement for triple-channel optocouplers such as HCPL-0738 or TLP293-4 in SOIC-16 footprints, provided the board layout observes minimum creepage/clearance rules and uses appropriate decoupling (0.1 µF ceramic per VCC pin). Its pin-compatible mapping (VCC1/VCC2, GND1/GND2, three IN/OUT pairs, EN) and identical DW package allow reuse of existing PCBs. However, unlike optocouplers, the ISO7330CDW requires no current-limiting resistors and delivers superior timing accuracy, CMTI, and temperature stability across –40°C to +125°C.