Texas Instruments ISO7221CHD

Mfr. Part

ISO7221CHD

Manufacturer

Luminary Micro / Texas Instruments

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Detailed Description

Dual-channel digital isolator using capacitive coupling technology. General-purpose, unidirectional channels. 4000 Vpk isolation rating. 25 Mbps data rate. Fast 1 ns rise/fall times with low delay and low pulse distortion. Wide supply 3.0 V to 5.5 V. Extended operating temperature from -55°C to +175°C. Compact 8‑SOIC package for surface-mount designs. RoHS3 compliant. Base family ISO7221.

Key Features

2 isolated digital channels (unidirectional)

Isolation rating 4000 Vpk

Data rate 25 Mbps

Rise/Fall time typ 1 ns / 1 ns

Propagation delay max 43 ns (tpLH/tpHL)

Pulse width distortion max 2 ns

Common-mode transient immunity (CMTI) min 25 kV/µs

Supply voltage 3.0 V to 5.5 V

Technology capacitive coupling isolation

Operating temperature -55°C to +175°C

Mounting type surface mount

Package 8‑SOIC (0.154" / 3.90 mm width)

Channel type unidirectional

Isolated power none (external supplies required on each side)

RoHS status ROHS3 compliant

Base product number ISO7221

Key Advantages

Strong isolation protection at 4000 Vpk for safety and noise immunity

Fast edges and low delay for tight timing in high-speed digital links

Low pulse distortion keeps signal integrity clean at 25 Mbps

High CMTI resilience to fast dv/dt environments (motor drives, switching power stages)

Simple power rails (3.0–5.5 V) and no optocoupler CTR aging or LED drive concerns

Wide temperature capability supports harsh environments

Small, proven footprint (8‑SOIC) simplifies PCB layout and assembly

RoHS3 compliance helps meet modern environmental requirements

Packaging

Type: 8‑SOIC, gull‑wing leads, JEDEC standard

Material: Molded epoxy body, copper leadframe, matte‑tin plated leads

Size: Body width approx 3.90 mm (0.154"); typical SOIC‑8 body length ~4.9 mm and height ~1.75 mm (refer to datasheet for exact dimensions)

Pin configuration (typical for ISO7221 family): Side 1 — VCC1, GND1, IN A, IN B; Side 2 — VCC2, GND2, OUT A, OUT B (directions depend on variant; this model is unidirectional, 1/1 per side)

Lead pitch: ~1.27 mm (standard SOIC‑8)

Thermal characteristics: Wide ambient range −55°C to +175°C; low power dissipation; use adequate copper area for heat spreading

Electrical isolation properties: 4000 Vpk isolation rating; high CMTI; creepage/clearance consistent with SOIC‑8 geometry (see datasheet for certified values)

Supplier device package: 8‑SOIC

Shipping form: Bulk

Lifecycle

Status: Active and widely used; not near discontinuation based on current market availability

Equivalent or alternative models:

- Texas Instruments ISO7721 family (newer generation, reinforced isolation, higher data rates; check pinout and isolation ratings)

- Texas Instruments ISO7221 variants (A/B/C options and D suffix for SOIC; differences in default channel direction and fail‑safe behaviors)

- Analog Devices ADuM1200 / ADuM1201 (2‑channel digital isolators, 2.5–5.5 V, up to 100 Mbps; magnetic isolation; verify pin compatibility and isolation rating)

- Silicon Labs Si8621/Si8221 series (2‑channel digital isolators, high CMTI, up to 150 Mbps; verify package and pin mapping)

- NVE IL712 / IL715 (2‑channel GMR isolators, high speed; check isolation voltage and pinout)

- Maxim Integrated MAX14930 family (multi‑channel digital isolators, high isolation; confirm pin compatibility)

Note: Always confirm pinout, channel direction, timing, isolation ratings, and certifications before substituting. If you need drop‑in replacements or guidance, contact our sales team via Y-IC’s website for detailed cross‑reference support.

Key Application Areas

Isolated microcontroller GPIO, timers, and status lines

Isolated SPI, UART, and digital control signals

Motor drives, inverters, and power conversion control interfaces

Industrial PLCs, factory automation, and test equipment

High dv/dt switching environments (GaN/SiC power stages)

Energy systems (solar, storage, grid interface control signals)

Harsh‑environment electronics requiring wide temperature operation

Datasheet

Y-IC provides the most authoritative datasheet for ISO7221CHD directly on our product page. We recommend downloading it now to get exact pinouts, mechanical drawings, certifications, and the latest specifications.

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