TOP234G-TL Equivalent & Substitute Parts Reference

Part Overview

The TOP234G-TL is an offline flyback converter IC from Power Integrations' TOPSwitch®-FX series, designed for isolated power supply applications with 30W output capacity. This component operates in the 66kHz to 132kHz switching frequency range and integrates internal protection features including current limiting, over-temperature, and over-voltage safeguards.

The TOP234G-TL is classified as Obsolete, indicating it is no longer in active production. Locating equivalent substitute parts is necessary for design continuity, maintenance of legacy systems, and procurement of replacement inventory. Alternative models within the TOPSwitch®-FX and TOPSwitch®-GX series provide functional equivalence while offering improved compliance status and availability.

Substiute Parts

TOP234G-TL

Power IntegrationsIn Stock: 4495TOP234G-TL Datasheet

Current PartRFQ

TOP233GN-TL

Power IntegrationsIn Stock: 2916TOP233GN-TL Datasheet

Parametric EquivalentRFQ

TOP234GN-TL

Power IntegrationsIn Stock: 2153TOP234GN-TL Datasheet

Parametric EquivalentRFQ

TOP245GN-TL

Power IntegrationsIn Stock: 6224TOP245GN-TL Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TOP234G-TL is determined by the following critical parameters:

Primary Substitution Criteria:

• Topology: Flyback
• Output Isolation: Isolated
• Voltage - Breakdown: 700V
• Package / Case: 8-SMD (7 Leads), Gull Wing
• Supplier Device Package: SMD-8B
• Mounting Type: Surface Mount
• Frequency - Switching: 66kHz ~ 132kHz
• Operating Temperature Range: -40°C ~ 150°C (TJ)
• Fault Protection: Current Limiting, Over Temperature, Over Voltage
• Control Features: Frequency Control

Secondary Substitution Parameters (Allow Variation):

• Power (Watts): 25W to 30W
• Duty Cycle: 66.5% to 78%
• Series: TOPSwitch®-FX or TOPSwitch®-GX
• RoHS Status: Compliant or Non-Compliant
• Product Status: Obsolete or Not For New Designs

The substitute parts TOP233GN-TL, TOP234GN-TL, and TOP245GN-TL maintain all primary substitution criteria while offering variations in power rating, duty cycle, and product status that do not affect functional compatibility in equivalent circuit topologies.

Parameter Comparison

Engineering Selection Recommendations

TOP233GN-TL Selection Criteria: TOP233GN-TL is functionally equivalent to TOP234G-TL for applications requiring 25W output capacity. This substitute offers RoHS Compliant status, addressing environmental regulatory requirements absent in the original TOP234G-TL. The 25W power rating accommodates designs with lower output power specifications while maintaining identical topology, isolation, voltage breakdown, switching frequency, and protection features. Suitable for legacy system maintenance where power requirements do not exceed 25W.

TOP234GN-TL Selection Criteria: TOP234GN-TL provides direct functional equivalence to TOP234G-TL with identical 30W power rating and 78% duty cycle. This substitute offers RoHS Compliant status and improved packaging options (Cut Tape and Digi-Reel®) compared to the original part. Recommended as the primary substitute for direct replacement in existing designs. Maintains all electrical and thermal specifications of the original TOP234G-TL.

TOP245GN-TL Selection Criteria: TOP245GN-TL represents a cross-series substitute from the TOPSwitch®-GX family, offering 30W power capacity with a reduced duty cycle of 66.5% compared to the original 78%. This substitute carries "Not For New Designs" status but provides RoHS Compliant certification and the highest current inventory (6200 Pcs). The duty cycle variation may require circuit topology adjustments in transformer design and feedback network configuration. Suitable for applications where duty cycle flexibility is acceptable and RoHS compliance is mandatory.

Frequently Asked Questions (FAQ)

Q: Can TOP233GN-TL replace TOP234G-TL in all applications?

A: TOP233GN-TL is functionally equivalent for applications with 25W or lower output power requirements. The 5W reduction in power rating compared to TOP234G-TL must be evaluated against your specific design power budget. All other electrical parameters, topology, isolation, voltage breakdown, switching frequency, and protection features are identical.

Q: What is the primary advantage of TOP234GN-TL over TOP234G-TL?

A: TOP234GN-TL provides identical electrical specifications and power rating (30W) to TOP234G-TL while offering RoHS Compliant status. The original TOP234G-TL is RoHS Non-Compliant. TOP234GN-TL also provides improved packaging flexibility with Cut Tape and Digi-Reel® options.

Q: Is TOP245GN-TL a direct pin-for-pin replacement?

A: TOP245GN-TL maintains the same 8-SMD (7 Leads), Gull Wing package and SMD-8B supplier device package as TOP234G-TL, enabling direct PCB placement compatibility. However, the duty cycle difference (66.5% vs. 78%) requires evaluation of transformer design and feedback network parameters to ensure proper circuit operation.

Q: Why does TOP245GN-TL have "Not For New Designs" status?

A: "Not For New Designs" status indicates the component is available for existing design support and legacy system maintenance but is not recommended for new product development. This status does not affect functional compatibility for equivalent circuit applications.

Q: What packaging options are available for these substitutes?

A: TOP233GN-TL is supplied in Cut Tape (CT) packaging. TOP234GN-TL offers both Cut Tape (CT) and Digi-Reel® options. TOP245GN-TL is supplied in Tape & Reel (TR) packaging. All maintain the same SMD-8B device package format.

Q: Are all substitutes RoHS Compliant?

A: TOP233GN-TL, TOP234GN-TL, and TOP245GN-TL are all RoHS Compliant. The original TOP234G-TL is RoHS Non-Compliant. For applications requiring RoHS compliance, any of the three substitutes are suitable alternatives.

Q: What is the moisture sensitivity level for these components?

A: All parts including TOP234G-TL and the three substitutes have Moisture Sensitivity Level (MSL) 4, requiring storage and handling within 72-hour dry conditions after package opening.