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TOP253EG Equivalent & Substitute Parts Reference
Part Overview
The TOP253EG is an offline flyback converter IC from Power Integrations' TOPSwitch®-HX series, designed for isolated power supply applications. This device integrates a high-voltage power switch with comprehensive protection features including current limiting, over-temperature, and over-voltage protection. The TOP253EG operates at switching frequencies of 66kHz and 132kHz with a 43W power rating and 700V breakdown voltage. As an active product with RoHS compliance and unlimited moisture sensitivity rating, the TOP253EG serves as a primary component in offline power conversion circuits. Equivalent and substitute parts within the TOPSwitch®-HX family provide alternative power ratings and packaging options while maintaining core electrical and mechanical compatibility for specific application requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Power Integrations |
| Series | TOPSwitch®-HX |
| Category | Power Management (PMIC) |
| Topology | Flyback |
| Output Isolation | Isolated |
| Voltage - Breakdown | 700V |
| Frequency - Switching | 66kHz, 132kHz |
| Duty Cycle | 78% |
| Package / Case | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads |
| Supplier Device Package | eSIP-7C |
| Mounting Type | Through Hole |
| Operating Temperature | -40°C ~ 150°C (TJ) |
| Fault Protection | Current Limiting, Over Temperature, Over Voltage |
| RoHS Status | RoHS Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Active |
Substitute Part Grouping Explanation
Substitute parts for the TOP253EG are selected from the TOPSwitch®-HX family based on strict electrical and mechanical parameter alignment. All substitute parts share identical core specifications: 700V breakdown voltage, 66kHz/132kHz switching frequency, 78% duty cycle, isolated flyback topology, eSIP-7C package configuration, through-hole mounting, -40°C to 150°C operating temperature range, and equivalent fault protection features (current limiting, over-temperature, over-voltage).
The primary differentiating parameter among substitute parts is Power (Watts), which varies across the family to accommodate different application power requirements. The TOP253EG operates at 43W. Substitute parts are grouped by their power ratings: TOP253EN (25W), TOP254EG/EN (62W), TOP255EN (81W), TOP256EG/EN (119W), TOP257EN (157W), TOP258EN (195W), and TOP259EG/EN (238W).
All substitute parts maintain identical packaging (7-SSIP, 6 Leads, Exposed Pad, Formed Leads), supplier device package (eSIP-7C), and mounting type (Through Hole). All parts are RoHS compliant with MSL rating of 1 (Unlimited) and active product status. Substitution is valid when the application circuit design accommodates the specific power rating of the selected alternative part.
Parameter Comparison
| Part Number | Manufacturer | Power (Watts) | Voltage - Breakdown | Frequency - Switching | Duty Cycle | Package / Case | Operating Temperature | Fault Protection | Product Status | Inventory (Pcs) |
|---|---|---|---|---|---|---|---|---|---|---|
| TOP253EG | Power Integrations | 43 W | 700V | 66kHz, 132kHz | 78% | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | -40°C ~ 150°C (TJ) | Current Limiting, Over Temperature, Over Voltage | Active | 677 |
| TOP253EN | Power Integrations | 25 W | 700V | 66kHz, 132kHz | 78% | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | -40°C ~ 150°C (TJ) | Current Limiting, Over Temperature, Over Voltage | Active | 1177 |
| TOP254EG | Power Integrations | 62 W | 700V | 66kHz, 132kHz | 78% | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | -40°C ~ 150°C (TJ) | Current Limiting, Over Temperature, Over Voltage | Active | 16400 |
| TOP254EN | Power Integrations | 62 W | 700V | 66kHz, 132kHz | 78% | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | -40°C ~ 150°C (TJ) | Current Limiting, Over Temperature, Over Voltage | Active | 3834 |
| TOP255EN | Power Integrations | 81 W | 700V | 66kHz, 132kHz | 78% | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | -40°C ~ 150°C (TJ) | Current Limiting, Over Temperature, Over Voltage | Active | 10037 |
| TOP256EG | Power Integrations | 119 W | 700V | 66kHz, 132kHz | 78% | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | -40°C ~ 150°C (TJ) | Current Limiting, Over Temperature, Over Voltage | Active | 1266 |
| TOP256EN | Power Integrations | 119 W | 700V | 66kHz, 132kHz | 78% | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | -40°C ~ 150°C (TJ) | Current Limiting, Over Temperature, Over Voltage | Active | 27159 |
| TOP257EN | Power Integrations | 157 W | 700V | 66kHz, 132kHz | 78% | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | -40°C ~ 150°C (TJ) | Current Limiting, Over Temperature, Over Voltage | Active | 1436 |
| TOP258EN | Power Integrations | 195 W | 700V | 66kHz, 132kHz | 78% | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | -40°C ~ 150°C (TJ) | Current Limiting, Over Temperature, Over Voltage | Active | 16620 |
| TOP259EG | Power Integrations | 238 W | 700V | 66kHz, 132kHz | 78% | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | -40°C ~ 150°C (TJ) | Current Limiting, Over Temperature, Over Voltage | Active | 9200 |
| TOP259EN | Power Integrations | 238 W | 700V | 66kHz, 132kHz | 78% | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | -40°C ~ 150°C (TJ) | Current Limiting, Over Temperature, Over Voltage | Active | 10100 |
Engineering Selection Recommendations
Selection of substitute parts for the TOP253EG is determined by application power requirements and component availability. All listed substitute parts maintain active product status with full RoHS compliance and unlimited moisture sensitivity rating (MSL 1), ensuring equivalent regulatory and environmental compliance.
For applications requiring lower power output than the TOP253EG (43W), the TOP253EN (25W) provides a direct substitute with identical electrical and mechanical specifications. For applications requiring higher power output, the TOP254EG/EN (62W), TOP255EN (81W), TOP256EG/EN (119W), TOP257EN (157W), TOP258EN (195W), and TOP259EG/EN (238W) series provide progressive power scaling within the same package and topology framework.
The EG and EN package designations indicate different lead-forming specifications within the eSIP-7C package family. Both designations are mechanically and electrically compatible with through-hole mounting applications. Selection between EG and EN variants should be based on specific PCB design requirements and lead-forming compatibility with existing board layouts.
Component availability varies across the substitute family. TOP256EN (27,159 pcs), TOP254EG (16,400 pcs), and TOP258EN (16,620 pcs) demonstrate highest inventory levels. TOP256EG (1,266 pcs), TOP257EN (1,436 pcs), and TOP253EG (677 pcs) show lower availability. Inventory status should be evaluated against project timeline requirements.
Frequently Asked Questions (FAQ)
Q: Can TOP253EN be used as a direct replacement for TOP253EG?
A: TOP253EN and TOP253EG share identical electrical specifications (25W power rating, 700V breakdown, 66kHz/132kHz switching frequency, 78% duty cycle) and mechanical specifications (eSIP-7C package, 7-SSIP configuration, through-hole mounting). The primary difference is the lead-forming designation (EN vs. EG). Substitution is valid when the PCB design accommodates the specific lead-forming configuration of the selected part.
Q: What is the primary difference between TOP253EG and TOP254EG?
A: The primary difference is power rating. TOP253EG is rated at 43W, while TOP254EG is rated at 62W. All other electrical parameters (700V breakdown, 66kHz/132kHz switching frequency, 78% duty cycle, isolated flyback topology) and mechanical specifications (eSIP-7C package, through-hole mounting) remain identical. Selection depends on the application's power output requirements.
Q: Are all substitute parts RoHS compliant?
A: Yes. All substitute parts listed (TOP253EN, TOP254EG, TOP254EN, TOP255EN, TOP256EG, TOP256EN, TOP257EN, TOP258EN, TOP259EG, TOP259EN) are RoHS compliant with MSL rating of 1 (Unlimited), matching the compliance status of the TOP253EG.
Q: Can I use a higher-power substitute part in a circuit designed for TOP253EG?
A: Higher-power substitute parts (TOP254EG/EN and above) maintain identical electrical and mechanical specifications except for power rating. Circuit compatibility depends on whether the application design can accommodate the higher power capability. The transformer and output circuit design must be evaluated to ensure proper operation with the selected substitute part's power rating.
Q: What does the eSIP-7C package designation mean?
A: eSIP-7C refers to the enhanced Single In-line Package with 7 pins and an exposed pad. This package configuration provides improved thermal performance through the exposed pad while maintaining through-hole mounting compatibility. All substitute parts use the identical eSIP-7C package specification.
Q: Are EG and EN package variants interchangeable?
A: EG and EN designations indicate different lead-forming specifications within the eSIP-7C package family. Both are mechanically and electrically compatible with through-hole mounting. Interchangeability depends on specific PCB design requirements and lead-forming compatibility. Verify lead-forming specifications against PCB design before substitution.
Q: What operating temperature range applies to all substitute parts?
A: All substitute parts operate across the identical temperature range of -40°C to 150°C (junction temperature). This specification applies uniformly across the entire TOPSwitch®-HX family listed as substitutes.
Q: Do all substitute parts include the same fault protection features?
A: Yes. All substitute parts include identical fault protection: current limiting, over-temperature protection, and over-voltage protection. These protection features are standard across the TOPSwitch®-HX series.
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