TOP234P Equivalent & Substitute Parts

Part Overview

The TOP234P is an offline switch flyback converter IC manufactured by Power Integrations, designed for isolated power supply applications. This device operates in the TOPSwitch®-FX series and delivers 30W output power with integrated frequency control and comprehensive fault protection. The TOP234P is classified as obsolete, making identification of compatible substitute components essential for ongoing production support, maintenance, and design continuity. Substitute parts must maintain electrical and mechanical compatibility while meeting current design and compliance requirements.

Substiute Parts

TOP234P

Power IntegrationsIn Stock: 4377TOP234P Datasheet

Current PartRFQ

TOP245PN

Power IntegrationsIn Stock: 2075TOP245PN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TOP234P is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Topology: Flyback
• Output Isolation: Isolated
• Voltage - Breakdown: 700V
• Power (Watts): 30 W
• Frequency - Switching: 66kHz ~ 132kHz
• Package / Case: 8-DIP (0.300", 7.62mm), 7 Leads
• Mounting Type: Through Hole
• Fault Protection: Current Limiting, Over Temperature, Over Voltage
• Control Features: Frequency Control
• Operating Temperature: -40°C ~ 150°C (TJ)

The TOP245PN qualifies as a parametric equivalent substitute. Both devices share identical topology, isolation characteristics, breakdown voltage, power rating, switching frequency range, package configuration, mounting type, fault protection features, control capabilities, and operating temperature range. Variations in duty cycle (78% vs. 66.5%) and product status do not preclude substitution when electrical and mechanical parameters align.

Parameter Comparison

Engineering Selection Recommendations

For Existing Production Support: The TOP245PN serves as a direct parametric equivalent for the obsolete TOP234P in applications requiring continued supply of compatible components. Both devices maintain identical electrical specifications across topology, isolation, voltage rating, power delivery, switching frequency, and thermal operating range. The 8-DIP through-hole package ensures mechanical compatibility with existing PCB layouts without modification.

Compliance Considerations: The TOP245PN achieves RoHS compliance, whereas the TOP234P does not. Selection of TOP245PN addresses regulatory requirements for new production runs or updated designs. The TOP245PN carries a "Not For New Designs" status, indicating it remains available for legacy system support but is not recommended for new product development initiatives.

Duty Cycle Variation: The duty cycle difference (78% vs. 66.5%) reflects internal design optimization between the FX and GX series generations. This parameter variation does not affect substitution eligibility when all other critical electrical and mechanical parameters align. Circuit-level validation is required to confirm performance equivalence in specific application contexts.

Frequently Asked Questions (FAQ)

Q: Can TOP245PN directly replace TOP234P in existing designs? A: Yes. The TOP245PN matches all critical electrical parameters: 700V breakdown voltage, 30W power rating, 66kHz–132kHz switching frequency, isolated flyback topology, identical fault protection, frequency control features, and -40°C to 150°C operating temperature range. The 8-DIP through-hole package is mechanically identical, requiring no PCB layout changes.

Q: What is the significance of the duty cycle difference between TOP234P (78%) and TOP245PN (66.5%)? A: Duty cycle reflects internal circuit design optimization between the TOPSwitch®-FX and TOPSwitch®-GX series. This difference does not prevent substitution when all other electrical specifications align. Application-specific circuit validation is necessary to confirm performance equivalence in your particular power supply design.

Q: Why is TOP234P classified as obsolete while TOP245PN is "Not For New Designs"? A: TOP234P is obsolete and no longer manufactured or supported. TOP245PN remains available for legacy system support but is not recommended for new product development. For new designs, consult Power Integrations for current-generation TOPSwitch alternatives.

Q: Are there RoHS compliance implications when substituting TOP234P with TOP245PN? A: Yes. TOP234P is RoHS non-compliant; TOP245PN is RoHS compliant. Substitution with TOP245PN addresses regulatory requirements for markets and applications requiring RoHS certification. Verify compliance requirements for your specific application and region.

Q: What packaging formats are available for TOP245PN? A: TOP245PN is supplied in Tube packaging. Both TOP234P and TOP245PN use the 8-PDIP-B package configuration with 7 leads, 8-DIP form factor (0.300", 7.62mm), and through-hole mounting type.

Q: Are there other substitute options beyond TOP245PN? A: The provided substitute list identifies TOP245PN as the parametric equivalent for TOP234P. Additional alternatives within the Power Integrations TOPSwitch family may exist; consult the manufacturer's current product selector or datasheet cross-reference documentation for comprehensive options.