ISO808A-1

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Galvanic isolated octal high-side power solid state relay with SPI interface for high inductive loads

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Product overview

Description

The ISO808A, ISO808A-1 (PowerSO-36) and ISO808AQ, ISO808AQ-1 (TFQFPN32) are galvanic isolated 8-channel drivers featuring a low supply current. Each driver contains 2 independent galvanic isolated voltage domains (VCC and VDD for the Process and Control Logic stages, respectively). The ICs are intended for driving any kind of load with one side connected to ground.

The Control Logic Stage features an 8-bit Output Status Register (where the MCU sets the ON/OFF status of the output channels in the Process Stage), daisy chaining is allowed. The two stages communicate through the galvanic isolation channel by an ST proprietary protocol.

Active channel current limitation (OVL) combined with thermal shutdown (OVT), independent for each channel, protects the device against overload.

Built-in thermal shut down protects each channel from over-temperature and overload: each overheated channel automatically turns OFF after its junction temperature triggers the protection threshold (TJSD). The channel turns back ON if its junction temperature decreases lower than restart threshold (TJR).

An additional case temperature sensor protects the whole chip against over-temperature (OVC event): if the case temperature triggers the TCSD threshold then overloaded channels are turned OFF and will restart only when case temperature decreased down to the reset threshold (TCR). Non overloaded channels continue to operate normally.

Other embedded functions are loss of ground protection, VCC and VDD UVLOs (with hysteresis), watchdog and VCC Power GOOD.

An internal circuit provides an OR-wired not latched common FAULT indicator signaling the channel OVT. The PGOOD diagnostic pin is activated if VCC goes below the power good threshold. Both FAULT and PGOOD pins are open drain, active low, fault indication pins.

  • All features

    • VCC(AMR) = 45 V
    • Wide process side op. range VCC = 9.2 to 36 V
    • RDS(on)  = 0.125 Ω per channel (TYP)
    • Fast demagnetization of inductive loads VDEMAG(TYP) = VCC - 54 V
    • Per channel process side op. current
      • ISO808A/ISO808AQ IOUT < 0.7 A
      • ISO808A-1/ISO808AQ-1 IOUT < 1 A
    • Low process and logic sides supply current
    • Under-voltage shut down with auto restart and hysteresis
    • Logic side 5 V and 3.3 V TTL/CMOS and MCU compatible I/Os
    • Logic side SPI interface
    • Common output enable/disable pin
    • Reset function for IC outputs disable
    • High common mode transient immunity
    • Short circuit protection on output channels
      • ISO808A/ISO808AQ ILIM(MIN) = 0.7 A
      • ISO808A-1/ISO808AQ-1 ILIM(MIN) = 1 A
    • Per-channel over-temperature protection with thermal independence of separate channels
    • Case over-temperature protection
    • Over-voltage protection (VCC clamping)
    • Loss of GND and VCC protections
    • Common fault open drain diagnostic
    • VCC Power Good open drain diagnostic for 24 V applications
    • Designed to meet IEC 61000-4-2, IEC 61000- 4-4, IEC 61000-4-5 and IEC 61000-4-8
    • UL1577 and UL508 certified
    • Safety limits according to IEC 60747-17 (former VDE 0844-11)
    • PowerSO-36 and TFQFPN32 Package

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EDA Symbols, Footprints and 3D Models

STMicroelectronics - ISO808A-1

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
ISO808A-1
Active
PowerSO 36 Industrial Ecopack2
ISO808AQTR-1
Active
TFQFPN 11.0X9.0X1.05 32L Industrial Ecopack3
ISO808ATR-1
Active
PowerSO 36 Industrial Ecopack2

ISO808A-1

Package:

PowerSO 36

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PowerSO 36

Grade

Industrial

RoHS Compliance Grade

Ecopack2

ISO808AQTR-1

Package:

TFQFPN 11.0X9.0X1.05 32L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

TFQFPN 11.0X9.0X1.05 32L

Grade

Industrial

RoHS Compliance Grade

Ecopack3

ISO808ATR-1

Package:

PowerSO 36

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PowerSO 36

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors