Texas Instruments ISO7341CQDWRQ1

Overview

ISO7341CQDWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified quad-channel digital isolator with three forward and one reverse signal channels, 25 Mbps signaling rate, 31 ns typical propagation delay (5-V), and integrated input noise filtering. It provides 3000 VRMS isolation per UL 1577 and operates across 3.3-V and 5-V supplies for motor control interface and battery pack monitoring.

For engineers reviewing the ISO7341CQDWRQ1 datasheet, ISO7341CQDWRQ1 pinout, ISO7341CQDWRQ1 application, or ISO7341CQDWRQ1 equivalent, key selection criteria include channel directionality (3F/1R), fail-safe output behavior (high default), enable-controlled tri-state outputs, and robust 70 kV/μs CMTI for noisy automotive environments.

Technical Context

The ISO7341CQDWRQ1 implements capacitive SiO₂-based galvanic isolation with separate VCCI/GNDI and VCCO/GNDO supply domains, enabling bidirectional level translation between 3.3-V and 5-V logic domains. Its architecture includes independent enable inputs (EN1, EN2) for side-1 and side-2 outputs, supporting selective channel shutdown without affecting isolated power domains.

It features TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max), integrated input glitch suppression (≥19 ns at 5 V), and failsafe output behavior triggered by input-side power loss - critical for functional safety in servo drive and battery management systems.

Key Specifications

Pinout & Package

ISO7341CQDWRQ1 uses a wide-body SOIC-16 (DW) package measuring 10.30 mm × 7.50 mm, optimized for creepage/clearance >8 mm and reinforced isolation integrity in automotive PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISO7341CDWQ1 and SI8641ED-B-IS, ISO7341CQDWRQ1 uniquely delivers AEC-Q100 Grade 1 operation, integrated input noise filtering, and automotive-grade CMTI - making it the only qualified solution for safety-critical motor control and battery monitoring where reliability under EFT/surge stress is non-negotiable.

Availability

ISO7341CQDWRQ1 is available at Aetrix Electronics and suitable for automotive motor control, battery management systems, and servo drive interface applications requiring stable component supply and long-term lifecycle assurance.

Supply support for ISO7341CQDWRQ1 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 delivering analog, embedded processing, and connectivity solutions with deep automotive system expertise and rigorous AEC-Q100 validation infrastructure.

The ISO734x-Q1 family was designed specifically for high-reliability automotive subsystems requiring galvanic isolation - including electric powertrain, battery monitoring, and ADAS sensor interfaces - with emphasis on EMC robustness and functional safety.

FAQ

What is the default output state of ISO7341CQDWRQ1 during input-side power loss?

The ISO7341CQDWRQ1 has a default-high output behavior when input-side power (VCCI) is lost. This fail-safe feature ensures that downstream circuits - such as gate drivers or safety relays - transition to a known safe state. The ISO7341CQDWRQ1 achieves this via internal circuitry that asserts high on all forward outputs (OUTA–OUTC) upon VCCI undervoltage detection, which occurs at ~2.35 V (rising) and ~2.33 V (falling). This behavior is confirmed in the Device Functional Modes section of the TI datasheet SLLSEK5B.

Does ISO7341CQDWRQ1 support independent enable control for forward and reverse channels?

Yes, ISO7341CQDWRQ1 provides two dedicated enable inputs: EN1 controls the three forward outputs (OUTA–OUTC), and EN2 controls the single reverse output (OUTD). When EN1 is low, OUTA–OUTC enter high-impedance state with tPLZ/tPHZ ≤13 ns (5 V); similarly, EN2 low disables OUTD. This separation allows independent power gating of control vs. feedback paths - essential for low-power sleep modes in automotive ECUs. Pin functions are defined in Table 6 of the ISO7341CQDWRQ1 datasheet.

What is the maximum common-mode transient immunity (CMTI) of ISO7341CQDWRQ1 and under what conditions is it measured?

The ISO7341CQDWRQ1 delivers 70 kV/μs typical CMTI at 5-V supply, measured per Figure 17 in the TI datasheet with VI = VCC or 0 V applied to input pins while monitoring output edge integrity. This rating reflects immunity to fast ground-bounce transients induced by IGBT switching in motor drives. At 3.3-V supply, CMTI is 50 kV/μs typical. These values exceed automotive EMC requirements (ISO 11452-4) and ensure reliable operation in high-dv/dt environments like traction inverters and DC-DC converters.

Can ISO7341CQDWRQ1 be used for level translation between 3.3-V and 5-V logic domains?

Yes, ISO7341CQDWRQ1 natively supports 3.3-V and 5-V level translation: VCCI can operate from 3.0–5.5 V independently of VCCO (also 3.0–5.5 V), allowing direct connection to 3.3-V MCUs on the input side and 5-V gate drivers or analog ICs on the output side. Input thresholds (VIH = 2 V min, VIL = 0.8 V max) are TTL-compatible across both voltages, eliminating need for external level shifters. This dual-supply flexibility is specified in Section 7.3 (Recommended Operating Conditions) of the ISO7341CQDWRQ1 datasheet.

What safety certifications does ISO7341CQDWRQ1 hold for automotive use?

ISO7341CQDWRQ1 holds multiple automotive-grade safety certifications: UL 1577 (3000 VRMS isolation), VDE V 0884-10 (4242 VPK basic), CSA Component Acceptance Notice 5A (IEC 60950-1/61010-1), and GB4943.1-2011 CQC certification. It is AEC-Q100 qualified for Grade 1 (–40°C to +125°C ambient), with HBM ±4000 V and CDM ±1500 V ESD ratings. These certifications are documented in Sections 7.6–7.7 of the TI datasheet SLLSEK5B and validated for use in ASIL-B–compliant systems per ISO 26262.