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.
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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 0884-11)
- PowerSO-36 and TFQFPN32 Package
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All tools & software
All resources
| Resource title | Version | Latest update |
|---|
Product Specifications (1)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| 5.0 | 06 Sep 2024 | 06 Sep 2024 |
Flyers (2)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| 1.0 | 19 Mar 2025 | 19 Mar 2025 | ||
| 23.09 | 26 Sep 2023 | 26 Sep 2023 |
Brochures (1)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| 1.0 | 28 Oct 2024 | 28 Oct 2024 |
Product Certifications (1)
| Resource title | Version | Latest update | ||
|---|---|---|---|---|
| 1.0 | 28 Feb 2023 | 28 Feb 2023 |
EDA Symbols, Footprints and 3D Models
STMicroelectronics - ISO808A
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Footprints
3D models
Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| ISO808A | Active | PowerSO 36 | Industrial | Ecopack2 | |
| ISO808AQTR | Active | TFQFPN 11.0X9.0X1.05 32L | Industrial | Ecopack3 | |
| ISO808ATR | Active | PowerSO 36 | Industrial | 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.
Sample & Buy
| Part Number | Marketing Status | Budgetary Price (US$)*/Qty | Order from ST | Order from distributors | Package | Packing Type | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | Operating Temperature (°C) (min) | Operating Temperature (°C) (max) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ISO808AQTR | Active | 4.8947 / 1k | 5 distributors | TFQFPN 11.0X9.0X1.05 32L | Tape and Reel | PHILIPPINES | EAR99 | NEC | |||||
| ISO808A | Active | 5.5622 / 1k | 5 distributors | PowerSO 36 | Tube | MALAYSIA | EAR99 | NEC | |||||
| ISO808ATR | Active | 5.5622 / 1k | 1 distributors | PowerSO 36 | Tape and Reel | MALAYSIA | EAR99 | NEC |
ISO808AQTR Active
ISO808A Active
ISO808ATR Active
(*) 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