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TOP256LN Equivalent & Substitute Parts
Part Overview
The TOP256LN is an offline flyback converter IC from Power Integrations' TOPSwitch®-HX series, designed for isolated power supply applications. This component integrates an internal power switch with comprehensive fault protection including current limiting, over-temperature, and over-voltage protection. The TOP256LN operates at switching frequencies of 66 kHz and 132 kHz with a maximum power rating of 88 W and a 700 V breakdown voltage rating.
The TOP256LN is classified as obsolete. Equivalent and substitute parts from the active TOPSwitch®-HX product line provide direct functional alternatives with maintained electrical and mechanical compatibility within the specified parameter ranges.
Substiute Parts
Key Parameters
| Parameter | TOP256LN |
|---|---|
| Manufacturer | Power Integrations |
| Series | TOPSwitch®-HX |
| Category | Power Management (PMIC) |
| Topology | Flyback |
| Output Isolation | Isolated |
| Internal Switch(s) | Yes |
| Voltage - Breakdown | 700 V |
| Frequency - Switching | 66 kHz, 132 kHz |
| Duty Cycle | 78% |
| Power (Watts) | 88 W |
| Fault Protection | Current Limiting, Over Temperature, Over Voltage |
| Operating Temperature | -40°C ~ 150°C (TJ) |
| Package / Case | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads |
| Supplier Device Package | eSIP-7F |
| Mounting Type | Through Hole |
| RoHS Status | RoHS Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| REACH Status | REACH Unaffected |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the TOP256LN is determined by strict adherence to the following electrical and mechanical parameters:
Critical Substitution Parameters:
- Topology: Flyback
- Output Isolation: Isolated
- Internal Switch(s): Yes
- Voltage - Breakdown: 700 V
- Frequency - Switching: 66 kHz, 132 kHz
- Duty Cycle: 78%
- Fault Protection: Current Limiting, Over Temperature, Over Voltage
- Operating Temperature: -40°C ~ 150°C (TJ)
- Package / Case: 7-SSIP, 6 Leads, Exposed Pad, Formed Leads
- Mounting Type: Through Hole
- Series: TOPSwitch®-HX
Power Rating Consideration: The TOP256LN operates at 88 W. Substitute parts are grouped by power rating capability. Parts with equal or greater power ratings (88 W and above) provide direct substitution. Parts with lower power ratings (21 W, 25 W, 43 W, 62 W, 81 W) are functional equivalents within the TOPSwitch®-HX family but operate at reduced power levels and must be selected based on application requirements.
Package Variant: The TOP256LN uses eSIP-7F package. Active substitute parts use eSIP-7C package. Both packages maintain identical 7-SSIP, 6 Leads, Exposed Pad, Formed Leads mechanical specifications and through-hole mounting compatibility.
Product Status: All substitute parts listed are Active status, providing long-term availability and supply continuity compared to the obsolete TOP256LN.
Parameter Comparison
| Part Number | Manufacturer | Series | Topology | Voltage - Breakdown | Frequency - Switching | Duty Cycle | Power (Watts) | Fault Protection | Operating Temperature | Package / Case | Mounting Type | Product Status | Inventory (Pcs) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TOP256LN | Power Integrations | TOPSwitch®-HX | Flyback | 700 V | 66 kHz, 132 kHz | 78% | 88 W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | Through Hole | Obsolete | 4300 |
| TOP252EG | Power Integrations | TOPSwitch®-HX | Flyback | 700 V | 66 kHz, 132 kHz | 78% | 21 W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | Through Hole | Active | 696 |
| TOP252EN | Power Integrations | TOPSwitch®-HX | Flyback | 700 V | 66 kHz, 132 kHz | 78% | 21 W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | Through Hole | Active | 5100 |
| TOP253EG | Power Integrations | TOPSwitch®-HX | Flyback | 700 V | 66 kHz, 132 kHz | 78% | 43 W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | Through Hole | Active | 677 |
| TOP253EN | Power Integrations | TOPSwitch®-HX | Flyback | 700 V | 66 kHz, 132 kHz | 78% | 25 W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | Through Hole | Active | 1177 |
| TOP254EG | Power Integrations | TOPSwitch®-HX | Flyback | 700 V | 66 kHz, 132 kHz | 78% | 62 W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | Through Hole | Active | 16400 |
| TOP254EN | Power Integrations | TOPSwitch®-HX | Flyback | 700 V | 66 kHz, 132 kHz | 78% | 62 W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | Through Hole | Active | 3834 |
| TOP255EG | Power Integrations | TOPSwitch®-HX | Flyback | 700 V | 66 kHz, 132 kHz | 78% | 81 W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | Through Hole | Active | 8000 |
| TOP255EN | Power Integrations | TOPSwitch®-HX | Flyback | 700 V | 66 kHz, 132 kHz | 78% | 81 W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | Through Hole | Active | 10037 |
| TOP256EG | Power Integrations | TOPSwitch®-HX | Flyback | 700 V | 66 kHz, 132 kHz | 78% | 119 W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | Through Hole | Active | 1266 |
| TOP256EN | Power Integrations | TOPSwitch®-HX | Flyback | 700 V | 66 kHz, 132 kHz | 78% | 119 W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, 6 Leads, Exposed Pad, Formed Leads | Through Hole | Active | 27159 |
Engineering Selection Recommendations
Direct Substitution (Equal or Greater Power Rating):
TOP256EG and TOP256EN are direct substitutes for TOP256LN. Both parts maintain 119 W power rating, exceeding the original 88 W specification. These parts are Active status, ensuring long-term supply availability. TOP256EN offers the highest inventory level (27,159 pcs) among equivalent parts.
Functional Equivalents (Lower Power Rating):
TOP255EG and TOP255EN (81 W) provide functional equivalence with power rating closest to the original 88 W specification. These parts are suitable for applications where the 88 W rating is not fully utilized.
TOP254EG and TOP254EN (62 W) are functional equivalents for applications requiring reduced power capacity.
TOP253EG (43 W) and TOP253EN (25 W) are functional equivalents for lower-power applications.
TOP252EG and TOP252EN (21 W) are functional equivalents for minimal-power applications.
Compliance and Certification:
All substitute parts maintain RoHS Compliance, REACH Unaffected status, and MSL 1 (Unlimited) moisture sensitivity rating, matching the original TOP256LN specifications. All parts are classified under ECCN EAR99 and HTSUS 8542.39.0001.
Package and Mounting Compatibility:
All substitute parts maintain identical mechanical specifications: 7-SSIP package with 6 leads, exposed pad, and formed leads. Through-hole mounting compatibility is preserved across all alternatives.
Frequently Asked Questions (FAQ)
Q: Can TOP256EN directly replace TOP256LN in existing designs?
A: Yes. TOP256EN maintains all critical electrical parameters: 700 V breakdown voltage, 66/132 kHz switching frequency, 78% duty cycle, isolated flyback topology, and identical fault protection features. The 119 W power rating exceeds the original 88 W specification. Mechanical compatibility is confirmed through identical 7-SSIP package specifications and through-hole mounting.
Q: What is the difference between TOP256EG and TOP256EN?
A: Both parts are functionally identical with 119 W power rating and Active product status. The primary difference is inventory availability: TOP256EN has 27,159 pcs in stock compared to TOP256EG with 1,266 pcs. Both use eSIP-7C package variant.
Q: Why does TOP256LN use eSIP-7F while substitutes use eSIP-7C?
A: Both eSIP-7F and eSIP-7C are package variants within the 7-SSIP family specification. Both maintain identical mechanical dimensions: 6 leads, exposed pad, and formed leads configuration. Through-hole mounting compatibility is preserved. The package variant change reflects the transition from obsolete to active product lines within the TOPSwitch®-HX series.
Q: Can I use TOP255EN instead of TOP256EN?
A: TOP255EN is a functional equivalent with 81 W power rating, compared to TOP256EN at 119 W. Selection depends on application power requirements. If the design operates at or below 81 W, TOP255EN is suitable. If the design requires the full 88 W capacity of the original TOP256LN, TOP256EN or TOP256EG is required.
Q: Are all substitute parts RoHS compliant?
A: Yes. All substitute parts maintain RoHS Compliance status identical to TOP256LN. REACH Unaffected status and MSL 1 (Unlimited) moisture sensitivity rating are consistent across all alternatives.
Q: What is the operating temperature range for substitute parts?
A: All substitute parts operate across -40°C to 150°C junction temperature (TJ), matching the original TOP256LN specification.
Q: Do substitute parts include the same fault protection features?
A: Yes. All substitute parts include Current Limiting, Over Temperature, and Over Voltage protection, identical to TOP256LN.
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