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HCPL-0708
Broadcom Limited
OPTOISO 3.75KV PUSH PULL 8SO
1893 Pcs New Original In Stock
Logic Output Optoisolator 15MBd Push-Pull, Totem Pole 3750Vrms 1 Channel 10kV/µs CMTI 8-SO Tall
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5.0 / 5.0
- (371 Ratings)
HCPL-0708
Product Overview
6406924
DiGi Electronics Part Number
HCPL-0708-DGManufacturer
Broadcom Limited
HCPL-0708
Description
OPTOISO 3.75KV PUSH PULL 8SOInventory
1893 Pcs New Original In Stock
Logic Output Optoisolator 15MBd Push-Pull, Totem Pole 3750Vrms 1 Channel 10kV/µs CMTI 8-SO Tall
Quantity
Minimum 1
Minimum 1
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HCPL-0708 Technical Specifications
Category
Optoisolators, Logic Output Optoisolators
Packaging
-
Series
-
Product Status
Obsolete
Number of Channels
1
Inputs - Side 1/Side 2
1/0
Voltage - Isolation
3750Vrms
Common Mode Transient Immunity (Min)
10kV/µs
Input Type
DC
Output Type
Push-Pull, Totem Pole
Current - Output / Channel
2 mA
Data Rate
15MBd
Propagation Delay tpLH / tpHL (Max)
60ns, 60ns
Rise / Fall Time (Typ)
20ns, 25ns
Voltage - Forward (Vf) (Typ)
1.5V
Current - DC Forward (If) (Max)
20mA
Voltage - Supply
4.5V ~ 5.5V
Operating Temperature
-40°C ~ 100°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Supplier Device Package
8-SO Tall
Datasheet & Documents
HTML Datasheet
HCPL-0708-DG
Environmental & Export Classification
RoHS Status
RoHS non-compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8541.49.8000
Additional Information
Standard Package
100
Alternative Parts
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MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
Die Produkte sind hochwertig, langlebig und werden stets professionell verkauft.
December 02, 2025
Their reliable support network gives me confidence in their products.
December 02, 2025
We've never faced unexpected failures thanks to the high-quality standards maintained by Di Digi Electronics.
December 02, 2025
I have always been satisfied with the quality and performance of DiGi Electronics' offerings.
December 02, 2025
The affordability of their offerings aligns perfectly with my needs.
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Frequently Asked Questions (FAQ)
Can the HCPL-0708 be safely replaced with a modern RoHS-compliant optoisolator in a 5V logic interface design without compromising signal integrity or isolation performance?
The HCPL-0708 is obsolete and non-RoHS, making it unsuitable for new designs in regulated markets. A viable drop-in replacement is the FODM8071, which offers similar 15MBd data rate, 3.75kVrms isolation, and push-pull output, while being RoHS-compliant and pin-compatible in an 8-SOIC package. However, verify propagation delay matching (FODM8071: 75ns max vs. HCPL-0708’s 60ns) in high-speed applications—marginally slower response may affect timing-critical systems. Always revalidate noise margins and CMTI under actual load conditions during migration.
What are the key reliability risks when using the HCPL-0708 in industrial environments with high common-mode noise, and how can they be mitigated despite its 10kV/µs CMTI rating?
While the HCPL-0708 specifies 10kV/µs CMTI, real-world industrial environments with fast-switching motor drives or IGBTs can generate transient spikes exceeding this threshold during fault conditions. To mitigate risk, add RC snubbers on the input side and ensure tight PCB layout with minimized loop areas between input and output grounds. Also, avoid routing high-dV/dt traces near the optoisolator. Consider adding a small ferrite bead on the output supply if power supply noise couples through the isolation barrier—this protects the logic-side circuitry even if the isolator itself remains functional.
Is the HCPL-0708 suitable for replacing an older optocoupler like the 6N137 in a UART communication link running at 115.2 kbps, and what design adjustments are needed?
Yes, the HCPL-0708 can replace the 6N137 in a 115.2 kbps UART link due to its 15MBd bandwidth and push-pull output (eliminating the need for a pull-up resistor required by the 6N137’s open-collector output). However, the HCPL-0708 has a higher forward voltage (1.5V typical) compared to the 6N137 (~1.4V), so recalculate the input current-limiting resistor to maintain ≥5mA forward current at your logic-high voltage. Also, confirm that the 60ns propagation delay doesn’t violate UART timing margins—especially in half-duplex or multi-drop configurations where cumulative delays matter.
Given that the HCPL-0708 is marked obsolete, what long-term supply chain and qualification risks should I consider before designing it into a medical or automotive prototype?
Designing in an obsolete component like the HCPL-0708 introduces significant long-term risks: no new stock availability, potential counterfeit parts in the aftermarket, and lack of manufacturer support for qualification documentation (e.g., AEC-Q101 for automotive or ISO 13485 for medical). Even though 1,798 units are currently in stock, this inventory is finite. For safety-critical applications, migrate to a qualified alternative such as the Avago (Broadcom) ACPL-M71T (automotive-grade) or Silicon Labs Si8711, which offer full compliance documentation, extended temperature validation, and active lifecycle support.
How does the HCPL-0708’s totem-pole output behave under fault conditions like output short-to-ground or overvoltage on the 5V supply rail, and what protection circuitry is recommended?
The HCPL-0708’s totem-pole output can source and sink current actively, which increases risk during output shorts—exceeding the 2mA continuous output current rating may damage the output stage. Although internal current limiting exists, sustained shorts can cause thermal stress. Add a series resistor (e.g., 220Ω) between the output and downstream logic to limit fault current. For overvoltage protection on the 5V supply, use a TVS diode rated for 5.5V clamping (e.g., SMAJ5.0A) close to the VCC pin. Also, ensure the input-side ground is isolated from output-side ground with >8mm creepage to maintain the 3.75kVrms isolation rating under fault conditions.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
HCPL-0708 CAD Models
Broadcom Limited HCPL-0708 PCB symbols & footprints
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