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FAN7621SSJX
onsemi
IC OFFLINE SW HALF-BRDG 16SOP
7458 Pcs New Original In Stock
Converter Offline Half-Bridge Topology Up to 300kHz 16-SOP
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Minimum 1
5.0 / 5.0
- (300 Ratings)
FAN7621SSJX
Product Overview
7751100
DiGi Electronics Part Number
FAN7621SSJX-DGManufacturer
onsemi
FAN7621SSJX
Description
IC OFFLINE SW HALF-BRDG 16SOPInventory
7458 Pcs New Original In Stock
Converter Offline Half-Bridge Topology Up to 300kHz 16-SOP
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
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FAN7621SSJX Technical Specifications
Category
Power Management (PMIC), AC DC Converters, Offline Switches
Packaging
Cut Tape (CT) & Digi-Reel®
Series
-
Product Status
Obsolete
Output Isolation
Isolated
Internal Switch(s)
No
Voltage - Breakdown
-
Topology
Half-Bridge
Voltage - Start Up
12.5 V
Voltage - Supply (Vcc/Vdd)
10V ~ 25V
Duty Cycle
50%
Frequency - Switching
Up to 300kHz
Fault Protection
Current Limiting, Over Load, Over Temperature, Over Voltage
Control Features
Frequency Control
Operating Temperature
-40°C ~ 130°C (TJ)
Package / Case
16-SOIC (0.209", 5.30mm Width)
Supplier Device Package
16-SOP
Mounting Type
Surface Mount
Base Product Number
FAN7621
Datasheet & Documents
HTML Datasheet
FAN7621SSJX-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
FAN7621SSJX-DG
FAN7621SSJXCT
FAN7621SSJXDKR
FAN7621SSJXTR
Standard Package
2,000
Alternative Parts
View DetailsPART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
상품이 빠르게 도착했고, 고객 지원팀이 매우 친절했어요.
de desembre 02, 2025
J’apprécie la transparence de leurs prix ainsi que la qualité de leur suivi après-vente.
de desembre 02, 2025
Affordable prices and attentive support—what more could we ask for?
de desembre 02, 2025
Their proactive approach in after-sales support prevents potential problems.
de desembre 02, 2025
Customer service is responsive and friendly, making me feel valued long after my purchase.
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Frequently Asked Questions (FAQ)
What are the key design risks when replacing the obsolete FAN7621SSJX with the suggested substitute FAN7621BSJX in an existing half-bridge offline power supply?
The FAN7621BSJX is a direct functional and pin-compatible upgrade of the FAN7621SSJX, but critical differences exist in startup behavior and fault response timing. While both support up to 300kHz switching and include over-temperature and over-load protection, the B-version has a faster internal soft-start ramp and tighter UVLO hysteresis, which can cause instability in designs with high input capacitance or slow feedback loops. Before substitution, validate startup under low-line conditions and ensure your optocoupler feedback network can accommodate the revised control dynamics. Always re-test full-load transient response and short-circuit recovery to avoid nuisance shutdowns.
Can the FAN7621SSJX safely drive a half-bridge converter at 300kHz with a 50% duty cycle in a 230VAC input application without an external gate driver?
No—the FAN7621SSJX lacks internal power switches and requires external MOSFETs, but its integrated high- and low-side drivers are optimized for moderate speeds. At 300kHz with high-voltage MOSFETs (e.g., >600V), parasitic inductance and Miller capacitance can cause shoot-through or excessive switching losses if dead-time control isn’t carefully managed. The IC provides adjustable dead time via external resistors, but at 300kHz, even nanosecond miscalculations risk cross-conduction. Use low-Qg MOSFETs (e.g., FCH072N60F) and minimize high-current loop area. Consider adding a small RC snubber across each switch node to dampen ringing and protect the drivers.
How does the FAN7621SSJX compare to the NCP13992ACDR2G for a 150W isolated offline power supply, and what integration trade-offs should I consider?
The NCP13992ACDR2G offers superior performance for 150W applications due to its resonant-mode operation (LLC), which reduces switching losses and EMI compared to the FAN7621SSJX’s hard-switched half-bridge topology. However, the FAN7621SSJX provides simpler control, lower BOM complexity, and better fault handling for overload conditions—making it more robust in cost-sensitive or rugged environments. The NCP13992 requires precise resonant tank design and is sensitive to load variations, while the FAN7621SSJX is more forgiving but less efficient above 100W. If efficiency and thermal performance are critical, migrate to the NCP13992; if design simplicity and reliability under fault are priorities, stick with the FAN7621SSJX despite its obsolete status.
What layout precautions are essential when designing a PCB with the FAN7621SSJX to avoid false triggering of its over-voltage or over-temperature protection?
The FAN7621SSJX’s fault pins (e.g., OVP, OTP) are highly sensitive to noise due to their analog nature. Keep feedback traces (especially from the output voltage divider and current sense resistor) away from high-dV/dt nodes like the switching node (HB pin) and gate drive lines. Use a solid ground plane beneath the IC but isolate the power ground (from the half-bridge return) from the signal ground with a single-point connection near the input capacitor. Route the RT/CT timing components close to the IC with minimal trace length to prevent coupling-induced frequency jitter. Additionally, place a 100nF ceramic capacitor directly at Vcc to suppress supply transients that could falsely trigger UVLO or OVP during fast load steps.
Is it safe to operate the FAN7621SSJX continuously at -40°C ambient temperature in an industrial enclosure with no active cooling?
Yes, but with caveats. The FAN7621SSJX is rated for -40°C to 130°C junction temperature, but cold-start reliability depends on external component behavior. At -40°C, electrolytic input capacitors exhibit significantly reduced capacitance and increased ESR, which may prevent reliable startup or cause voltage droop that triggers UVLO. Replace aluminum electrolytics with polymer or ceramic types rated for low-temperature operation. Also, verify that your optocoupler (e.g., PC817) maintains adequate CTR at cold temperatures—CTR typically drops by 30–50% at -40°C, potentially destabilizing the feedback loop. Always perform cold-bench testing with full load to confirm stable regulation and fault recovery.
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.
FAN7621SSJX CAD Models
onsemi FAN7621SSJX PCB symbols & footprints
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