Si873x Data Sheet
Low Input Current LED Emulator, Logic Output Isolators
The Si873x
isolators are pin-compatible, single-channel, drop-in replacements for pop-
ular optocouplers with data rates up to 15 Mbps. These devices isolate high-speed digi-
tal signals and offer performance, reliability, and flexibility advantages not available
with optocoupler solutions. The Si873x series is based on Silicon Labs' proprietary
CMOS isolation technology for low-power and high-speed operation and are resistant
to the wear-out effects found in optocouplers that degrade performance with increasing
temperature, forward current, and device age. As a result, the Si873x series offer lon-
ger service life and dramatically higher reliability compared to optocouplers. Ordering
options include logic output with and without output enable options.
Applications
• Industrial automation systems
• Motor controls and drives
•
Isolated switch mode power sup-
plies
• Isolated data acquisition
•
Test and measurement equipment
Safety Regulatory Approvals
• UL 1577 recognized
• Up to 2500 V
RMS
for 1 minute
• CSA component notice 5 A appro-
val
• VDE certification conformity
• VDE0884-10 (basic/reinforced insu-
lation)
• CQC certification approval
• GB4943.1
KEY FEATURES
• High Speed: dc to 15 Mbps
• 2.5 to 5.5 V logic output
•
Pin-compatible, drop-in upgrades for
popular high-speed digital optocouplers
• Performance and reliability advantages vs.
optocouplers:
• Resistant to temperature, age and
forward current effects
• 10x lower FIT rate for longer service life
• Lower power and forward input diode
current
• 1 channel diode emulator input
• Propagation delay 30 ns
• 10 kV surge withstand capability
• AEC-Q100 qualified
• Wide operating temperature range: – 40 to
+125 °C
• RoHS-compliant packages: SOIC-8
(Narrow body)
Diode
Emulator
IF
A1
Output
Stage
(Logic Out)
OUT
VDD
XMIT
GND
REC
C1
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