PC3ST11NSZCF Equivalent & Substitute Parts

Part Overview

The PC3ST11NSZCF is a 5kV isolation optoisolator with triac output manufactured by Sharp Microelectronics. This component is designed for applications requiring galvanic isolation in triac-driven circuits with high voltage isolation requirements. The part is currently obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Key Parameters

Parameter	Value
Manufacturer Part Number	PC3ST11NSZCF
Manufacturer	Sharp Microelectronics
Category	Optoisolators
Description	Optoisolator Triac Output 5000Vrms 1 Channel 4-DIP
Output Type	Triac
Voltage - Isolation	5000Vrms
Voltage - Off State	600 V
Number of Channels	1
Current - LED Trigger (Ift) (Max)	5mA
Current - On State (It (RMS)) (Max)	100 mA
Current - Hold (Ih)	4.6mA
Turn On Time	100µs (Max)
Voltage - Forward (Vf) (Typ)	1.2V
Current - DC Forward (If) (Max)	50 mA
Operating Temperature	-30°C ~ 100°C
Package / Case	4-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the PC3ST11NSZCF is determined by strict equivalence across the following critical parameters:

Voltage isolation rating: 5000Vrms minimum
Output type: Triac configuration
Number of channels: Single channel
Package type: 4-DIP through-hole form factor
Off-state voltage: 600V minimum
On-state current capability: 100mA RMS minimum
Hold current: 4.6mA or lower
Turn-on time: 100µs maximum
Operating temperature range: Must encompass -30°C to 100°C minimum

The APT1221 manufactured by Panasonic Electric Works meets all these substitution criteria and is classified as an active product, providing long-term availability for replacement applications.

Parameter Comparison

Parameter	PC3ST11NSZCF (Sharp)	APT1221 (Panasonic)	Compatibility
Output Type	Triac	Triac	Equivalent
Voltage - Isolation	5000Vrms	5000Vrms	Equivalent
Voltage - Off State	600 V	600 V	Equivalent
Number of Channels	1	1	Equivalent
Current - LED Trigger (Ift) (Max)	5mA	10mA	Compatible (APT1221 requires higher trigger current)
Current - On State (It (RMS)) (Max)	100 mA	100 mA	Equivalent
Current - Hold (Ih)	4.6mA	4.6mA	Equivalent
Turn On Time	100µs (Max)	100µs (Max)	Equivalent
Voltage - Forward (Vf) (Typ)	1.2V	1.21V	Compatible (negligible difference)
Current - DC Forward (If) (Max)	50 mA	50 mA	Equivalent
Operating Temperature	-30°C ~ 100°C	-40°C ~ 100°C	Compatible (APT1221 has extended lower range)
Package / Case	4-DIP (0.300", 7.62mm)	4-DIP (0.300", 7.62mm)	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Static dV/dt (Min)	1kV/µs	500V/µs	Compatible (PC3ST11NSZCF has higher dV/dt rating)
Product Status	Obsolete	Active	APT1221 provides current availability

Engineering Selection Recommendations

The APT1221 is the qualified substitute for the PC3ST11NSZCF based on the following factors:

Electrical Equivalence: Both components share identical isolation voltage (5000Vrms), off-state voltage (600V), on-state current (100mA RMS), hold current (4.6mA), and turn-on time (100µs maximum). These parameters define the functional core of the optoisolator and are fully matched.

Package Compatibility: Both components use identical 4-DIP through-hole packaging (0.300", 7.62mm), enabling direct board-level substitution without layout modifications.

Operational Differences: The APT1221 requires higher LED trigger current (10mA versus 5mA) and has lower static dV/dt rating (500V/µs versus 1kV/µs). Circuit designs must accommodate the increased trigger current requirement through appropriate current-limiting resistor adjustment. The lower dV/dt specification of the APT1221 is acceptable for standard triac switching applications but should be evaluated for high-speed switching environments.

Availability and Compliance: The APT1221 is an active product with current manufacturing status, ensuring long-term supply chain continuity. It carries ROHS3 compliance and REACH unaffected status, meeting modern regulatory requirements. The PC3ST11NSZCF, being obsolete, presents supply risk for new production and ongoing support.

Certifications: Both components carry equivalent safety approvals (CSA/UR for PC3ST11NSZCF; cUR/VDE for APT1221), suitable for industrial and consumer applications.

Frequently Asked Questions (FAQ)

Q: Can the APT1221 be used as a direct pin-for-pin replacement for the PC3ST11NSZCF?

A: Yes. Both components use identical 4-DIP packaging with matching pinout and electrical interface. No board redesign is required for physical substitution.

Q: What is the impact of the APT1221's higher LED trigger current (10mA vs 5mA)?

A: The input circuit must supply 10mA to reliably trigger the APT1221 versus 5mA for the original part. This requires adjustment of the current-limiting resistor on the LED input side. The calculation follows Ohm's law: R = (V_supply - V_f) / I_trigger, where V_f is approximately 1.21V for the APT1221.

Q: Does the lower static dV/dt rating of the APT1221 (500V/µs vs 1kV/µs) affect performance?

A: For standard triac switching applications with typical AC line frequencies (50/60 Hz), the 500V/µs dV/dt rating is sufficient. High-speed switching circuits or applications with rapid voltage transients should be evaluated against specific circuit requirements.

Q: Are there temperature range differences between these components?

A: The APT1221 operates from -40°C to 100°C, extending 10°C lower than the PC3ST11NSZCF (-30°C to 100°C). This provides additional margin for cold-temperature applications.

Q: What certifications apply to the APT1221?

A: The APT1221 carries cUR and VDE approvals, with ROHS3 compliance and REACH unaffected status. These certifications meet current industrial and consumer safety standards.

Q: Is the APT1221 suitable for new product designs?

A: Yes. As an active product with current manufacturing status and modern regulatory compliance, the APT1221 is appropriate for new designs requiring 5kV isolation triac optoisolators in 4-DIP packaging.

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