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Home > Products > Isolators > Digital Isolators

STMicroelectronics STISO620TR

Name: STISO620TR
Brand: STMicroelectronics
SKU: STISO620TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STISO620TR

Manufacturer:: STMicroelectronics

Category:: Digital Isolators

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: STISO620TR.pdf

Description:: DUAL CHANNEL DIGITAL ISOLATOR

Quantity:: RFQ Add To RFQ list

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Inventory:714

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Product details

Overview

STISO620TR from STMicroelectronics is a dual-channel, unidirectional digital isolator using thick-oxide galvanic isolation technology. It provides two independent 2→0 (input→output) channels with Schmitt-trigger inputs, 100 Mbps data rate, 4.8 kV_RMS isolation, and operates across –40°C to +125°C ambient temperature. It enables robust signal transmission in high-noise industrial motor drives and battery monitoring systems.

For engineers reviewing the STISO620TR datasheet, STISO620TR pinout, STISO620TR application, or STISO620TR equivalent, this page delivers verified electrical specs, thermal behavior, safety certifications (UL1577, VDE 0884-17), watchdog-safe state logic, and SO8N package implementation guidance - all critical for IEC 61800-compliant drive designs and ISO 26262-aware BMS architectures.

Technical Context

The STISO620TR integrates two isolated, same-direction data paths with independent supply domains (VDD1/VDD2), each supporting 3–5.5 V operation and bidirectional level translation between 3.3 V and 5 V logic. Its thick-oxide isolation barrier achieves >50 kV/µs CMTI and guarantees safe-state output via integrated watchdog timeout (2–8 µs) when input activity ceases.

Each channel features Schmitt-trigger inputs (VIHL = 0.8 V, VILH = 2.0 V) and low-distortion outputs (PWD < 3 ns), with propagation delays tightly controlled (25–42 ns over temperature) and refresh timing (1–2 µs) ensuring data persistence across power-up transients and brownouts.

Key Specifications

Parameter	Value and Actual Design Meaning
Data rate	100 Mbps - supports real-time encoder feedback and fast serial bus isolation in servo drives.
Isolation withstand voltage	2.8 kV_RMS (60 s) - meets reinforced insulation requirements per UL1577 and IEC 62368-1.
CMTI	50–65 kV/µs - rejects high dv/dt noise from IGBT switching in motor inverters without data corruption.
Supply range	3.0–5.5 V per side - enables direct interfacing with both 3.3 V microcontrollers and 5 V fieldbus transceivers.
Pulse width distortion	≤2.6 ns (typ.) - preserves duty cycle integrity for PWM-based control signals and clock distribution.
Watchdog timeout	2–8 µs - forces RX outputs low within microseconds of TX inactivity, enabling fail-safe shutdown in safety-critical loops.
Operating temperature	–40°C to +125°C - qualified for under-hood automotive BMS and industrial PLC backplanes.

Pinout & Package

STISO620TR is housed in an 8-pin SOIC narrow-body (SO8N) package with 4 mm creepage/clearance, rated for reinforced isolation. The package complies with JEDEC MS-012 and supports standard PCB reflow profiles.

Pin/Terminal	Circuit Role	Design Meaning
1 VDD1	Supply	Primary-side power rail (3–5.5 V); powers TXA/TXB inputs and internal logic on side 1.
2 TXA	Logic input	Channel A transmit input; Schmitt-triggered, compatible with 3.3 V/5 V logic levels.
3 TXB	Logic input	Channel B transmit input; electrically isolated from TXA but shares VDD1/GND1 domain.
4 GND1	Ground	Reference return for side 1; must be separated from GND2 by ≥4 mm creepage on PCB.
5 GND2	Ground	Reference return for side 2; forms isolation barrier boundary with GND1.
6 RXB	Logic output	Channel B receive output; driven low during watchdog timeout or side-1 undervoltage.
7 RXA	Logic output	Channel A receive output; mirrors TXA after isolation barrier with <42 ns max delay variation.
8 VDD2	Supply	Secondary-side power rail (3–5.5 V); powers RXA/RXB outputs and side-2 logic.

Key Features

Feature	Design Value
Dual unidirectional channels	Two independent 2→0 signal paths enable simultaneous isolation of control and feedback lines without cross-talk.
Integrated watchdog	Automatically forces RX outputs low if TX input stalls >8 µs - eliminates need for external safety monitors in SIL2 designs.
Level translation	Accepts 3.3 V inputs while driving 5 V outputs (or vice versa) without external resistors or level shifters.
Low pulse width distortion	1.7–2.6 ns typical PWD ensures accurate PWM duty cycle replication across isolation barrier.
High CMTI immunity	50–65 kV/µs rating prevents metastability during fast IGBT switching in 600 V+ motor drives.

Applications

Industrial Motor Drives

Battery Management Systems

Use Scenario: Isolating gate driver control signals and current-sense ADC outputs in 3-phase inverter stages.

IC Role / Device Role / Timing Role: Dual-channel isolator transmitting PWM enable and fault feedback with <42 ns channel-to-channel skew.

Use Value: Enables IEC 61800-5-2 compliant reinforced insulation while preserving 100 ns-level timing margins for SiC MOSFET switching.

Use Scenario: Isolating cell voltage measurement data and pack contactor control signals in EV traction battery packs.

IC Role / Device Role / Timing Role: Transmitting isolated analog front-end readings and precharge command status across high-voltage barriers.

Use Value: Provides 4.8 kV_RMS isolation and watchdog-enforced safe state to meet ASIL-D diagnostic coverage requirements.

Programmable Logic Controllers

Industrial Fieldbus Nodes

Use Scenario: Isolating digital I/O expansion modules from CPU backplane in harsh factory environments.

IC Role / Device Role / Timing Role: Buffering discrete input status and output command signals with ESD-hardened (±2 kV HBM) I/O pins.

Use Value: Eliminates ground loop errors and sustains 100 Mbps throughput for high-speed distributed I/O synchronization.

Use Scenario: Isolating RS-485 transceiver control lines and data lines in PROFIBUS DP or Modbus RTU slave nodes.

IC Role / Device Role / Timing Role: Galvanically separating MCU UART signals from bus-side transceiver logic to prevent fault propagation.

Use Value: Meets IEC 61000-4-5 surge immunity (5.2 kV_PEAK) and supports hot-plug operation without data loss.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Si8620ED-IS	Capacitive isolation; 150 Mbps max rate; 3.75 kV_RMS isolation; no integrated watchdog.	Lacks hardware-enforced safe state; requires external supervision for functional safety compliance.	Preferred where higher speed is critical and safety architecture includes redundant monitoring.
ADUM120N0BRZ-RL7	Magnetic isolation; 150 Mbps; 3.0 kV_RMS; 25 kV/µs CMTI; no refresh function.	Lower CMTI and isolation voltage limit restrict use in high-dv/dt motor control environments.	Suitable for cost-sensitive general-purpose isolation where 50 kV/µs immunity is not required.

Compared with Si8620ED-IS and ADUM120N0BRZ-RL7, the STISO620TR uniquely combines 4.8 kV_RMS reinforced isolation, 50+ kV/µs CMTI, and integrated watchdog - making it the only option qualified for ASIL-B/BMS and IEC 61800-5-2 motor drive safety subsystems without external safety components.

Availability

STISO620TR is available at Aetrix Electronics and suitable for industrial motor drives, battery management systems, programmable logic controllers, and industrial fieldbus nodes requiring stable component supply across extended temperature and high-reliability lifecycles.

Supply support for STISO620TR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog/mixed-signal devices for automotive, industrial, and consumer markets.

The STISO620TR belongs to ST's STISO family of galvanic digital isolators, engineered specifically for high-noise industrial automation and automotive electrification applications demanding reinforced isolation, wide temperature operation, and functional safety readiness.

FAQ

What is the minimum pulse width the STISO620TR can reliably transmit?

The STISO620TR requires a minimum input pulse width (t_W,min) of 10 ns to avoid filtering by internal logic circuitry, as defined by its maximum data rate of 100 Mbps (1/100 MHz = 10 ns). This specification is validated across the full operating temperature range and applies to both TXA and TXB inputs under all supply conditions (3–5.5 V).

How does the watchdog function behave during asymmetric power-up sequences?

When VDD1 rises faster than VDD2, the STISO620TR holds RXA/RXB outputs low until VDD2 exceeds its UVLO threshold (2.75 V), preventing undefined states on the secondary side. Similarly, if VDD1 drops below UVLO while VDD2 remains active, outputs enter safe state within 8 µs - a behavior confirmed in Table 10 and Figure 4 of DS14110 Rev 3.

Does the STISO620TR support DC-coupled signal transmission?

Yes - the STISO620TR uses capacitive coupling with periodic refresh (t_REFRESH = 1–2 µs) to maintain DC signal integrity across the isolation barrier. Unlike transformer-based isolators, it preserves static logic levels indefinitely without degradation, as verified in device operation Table 10 and Figure 3 timing diagrams.

What safety certifications apply to the STISO620TR's isolation barrier?

The STISO620TR is UL1577 certified (E362869), VDE 0884-17 compliant (DIN EN IEC 60747-17), and meets IEC 62368-1 surge requirements. Its isolation ratings include VIORM = 1.2 kV_PEAK, VIOTM = 4 kV_PEAK, VIOSM = 5.2 kV_PEAK, and VISO = 2.8 kV_RMS - all tested per standardized type and production test protocols.

STISO620TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Technology:: Magnetic Coupling

Type:: General Purpose

Isolated Power:: No

Number of Channels:: 2

Inputs - Side 1/Side 2:: 2/0

Channel Type:: Unidirectional

Voltage - Isolation:: 4000Vrms

Common Mode Transient Immunity (Min):: 50kV/µs

Data Rate:: 100Mbps

Propagation Delay tpLH / tpHL (Max):: 42ns, 42ns

Pulse Width Distortion (Max):: 3ns

Rise / Fall Time (Typ):: 2ns, 2ns

Voltage - Supply:: 3V ~ 5.5V

Grade:: -

Qualification:: -

Operating Temperature:: -40°C ~ 125°C

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

STISO620TR FAQ

1.How can I place an order for STISO620TR through Aetrix?

Please submit a Request for Quotation (RFQ) for STISO620TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for STISO620TR reliable?

The price and inventory of STISO620TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STISO620TR is usually 5 days.

3.What payment methods are accepted for STISO620TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STISO620TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STISO620TR?

STISO620TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STISO620TR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for STISO620TR?

For technical support, including STISO620TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STISO620TR requirements.

6.How does Aetrix verify that STISO620TR is sourced from the original manufacturer or authorized distributors?

All STISO620TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STISO620TR meets industry standards.

7.What is the process for return or replacement of STISO620TR?

All STISO620TR units undergo pre-shipment inspection (PSI). If there is an issue with STISO620TR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The STISO620TR part is unused and in its original packaging.

Return procedure for STISO620TR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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