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TOP258LN Equivalent & Substitute Parts
Part Overview
The TOP258LN is an offline flyback converter IC from Power Integrations' TOPSwitch®-HX series, designed for isolated power supply applications. This device integrates a 700V internal switch with comprehensive fault protection including current limiting, over-temperature, and over-voltage monitoring. The TOP258LN operates at switching frequencies of 66kHz and 132kHz with a maximum power rating of 122W and 78% duty cycle.
The TOP258LN is classified as obsolete. Equivalent substitute parts from the active TOPSwitch®-HX product line are available to maintain design continuity and ensure long-term supply availability. Substitutes must maintain electrical compatibility across voltage breakdown, topology, switching frequency, duty cycle, fault protection features, and operating temperature range.
Substiute Parts
Key Parameters
| Parameter | TOP258LN |
|---|---|
| Manufacturer | Power Integrations |
| Series | TOPSwitch®-HX |
| Topology | Flyback |
| Output Isolation | Isolated |
| Internal Switch(s) | Yes |
| Voltage - Breakdown | 700V |
| Frequency - Switching | 66kHz, 132kHz |
| Duty Cycle | 78% |
| Power (Watts) | 122W |
| 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 eligibility for the TOP258LN is determined by strict adherence to the following electrical and mechanical parameters:
Critical Compatibility Parameters:
- Topology: Flyback (required)
- Output Isolation: Isolated (required)
- Internal Switch(s): Yes (required)
- Voltage - Breakdown: 700V (required)
- Frequency - Switching: 66kHz, 132kHz (required)
- Duty Cycle: 78% (required)
- Fault Protection: Current Limiting, Over Temperature, Over Voltage (required)
- Operating Temperature: -40°C ~ 150°C (TJ) (required)
- Package / Case: 7-SSIP, 6 Leads, Exposed Pad, Formed Leads (required)
- Mounting Type: Through Hole (required)
- RoHS Status: RoHS Compliant (required)
- Moisture Sensitivity Level (MSL): 1 (Unlimited) (required)
- REACH Status: REACH Unaffected (required)
Variable Parameter (Power Rating):
- Power (Watts): Varies by substitute model
All substitute parts listed below maintain identical electrical characteristics and mechanical compatibility with the TOP258LN. Differences in power rating reflect the specific design of each substitute model within the TOPSwitch®-HX series. Selection of a substitute should be based on the power requirements of the target application.
Parameter Comparison
| Part Number | Manufacturer | Series | Topology | Voltage - Breakdown | Frequency - Switching | Duty Cycle | Power (Watts) | Fault Protection | Operating Temperature | Package | Product Status | Inventory (Pcs) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TOP258LN | Power Integrations | TOPSwitch®-HX | Flyback | 700V | 66kHz, 132kHz | 78% | 122W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, eSIP-7F | Obsolete | 1242 |
| TOP252EG | Power Integrations | TOPSwitch®-HX | Flyback | 700V | 66kHz, 132kHz | 78% | 21W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, eSIP-7C | Active | 696 |
| TOP252EN | Power Integrations | TOPSwitch®-HX | Flyback | 700V | 66kHz, 132kHz | 78% | 21W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, eSIP-7C | Active | 5100 |
| TOP253EG | Power Integrations | TOPSwitch®-HX | Flyback | 700V | 66kHz, 132kHz | 78% | 43W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, eSIP-7C | Active | 677 |
| TOP253EN | Power Integrations | TOPSwitch®-HX | Flyback | 700V | 66kHz, 132kHz | 78% | 25W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, eSIP-7C | Active | 1177 |
| TOP254EG | Power Integrations | TOPSwitch®-HX | Flyback | 700V | 66kHz, 132kHz | 78% | 62W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, eSIP-7C | Active | 16400 |
| TOP254EN | Power Integrations | TOPSwitch®-HX | Flyback | 700V | 66kHz, 132kHz | 78% | 62W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, eSIP-7C | Active | 3834 |
| TOP255EG | Power Integrations | TOPSwitch®-HX | Flyback | 700V | 66kHz, 132kHz | 78% | 81W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, eSIP-7C | Active | 8000 |
| TOP255EN | Power Integrations | TOPSwitch®-HX | Flyback | 700V | 66kHz, 132kHz | 78% | 81W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, eSIP-7C | Active | 10037 |
| TOP256EG | Power Integrations | TOPSwitch®-HX | Flyback | 700V | 66kHz, 132kHz | 78% | 119W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, eSIP-7C | Active | 1266 |
| TOP256EN | Power Integrations | TOPSwitch®-HX | Flyback | 700V | 66kHz, 132kHz | 78% | 119W | Current Limiting, Over Temperature, Over Voltage | -40°C ~ 150°C | 7-SSIP, eSIP-7C | Active | 27159 |
Engineering Selection Recommendations
Product Status Consideration: The TOP258LN is classified as obsolete. All listed substitute parts are active products from Power Integrations' current TOPSwitch®-HX portfolio, ensuring continued availability and manufacturing support.
Compliance and Certification: All substitute parts maintain identical compliance certifications:
- RoHS Compliant
- REACH Unaffected
- Moisture Sensitivity Level 1 (Unlimited)
- ECCN: EAR99
- HTSUS: 8542.39.0001
Power Rating Selection: The TOP258LN operates at 122W. Substitute selection should be based on the actual power requirements of the target application:
- For applications requiring ≤21W: TOP252EG or TOP252EN
- For applications requiring ≤25W: TOP253EN
- For applications requiring ≤43W: TOP253EG
- For applications requiring ≤62W: TOP254EG or TOP254EN
- For applications requiring ≤81W: TOP255EG or TOP255EN
- For applications requiring ≤119W: TOP256EG or TOP256EN
Package Compatibility: The TOP258LN uses eSIP-7F packaging. Substitute parts use eSIP-7C packaging. Both are 7-SSIP, 6 Leads, Exposed Pad, Formed Leads configurations with Through Hole mounting. PCB layout modifications may be required to accommodate package differences.
Inventory Availability: TOP256EN offers the highest inventory level (27,159 pcs) among substitute parts with power rating closest to the TOP258LN (119W vs. 122W).
Frequently Asked Questions (FAQ)
Q: Can TOP252EG or TOP252EN be used as direct replacements for TOP258LN?
A: TOP252EG and TOP252EN are electrically and mechanically compatible with TOP258LN across all critical parameters (topology, voltage breakdown, switching frequency, duty cycle, fault protection, operating temperature, and package type). However, their power rating is 21W compared to TOP258LN's 122W. Selection depends on application power requirements. If the application requires 122W output, a higher-rated substitute such as TOP256EG or TOP256EN is necessary.
Q: What is the difference between eSIP-7F and eSIP-7C packaging?
A: Both eSIP-7F (TOP258LN) and eSIP-7C (substitute parts) are 7-SSIP configurations with 6 leads, exposed pad, and formed leads for through-hole mounting. The primary difference is in the physical package dimensions and lead spacing. PCB layout modifications are required when transitioning from TOP258LN to substitute parts.
Q: Are all substitute parts RoHS compliant?
A: Yes. All substitute parts listed (TOP252EG, TOP252EN, TOP253EG, TOP253EN, TOP254EG, TOP254EN, TOP255EG, TOP255EN, TOP256EG, TOP256EN) are RoHS Compliant with REACH Unaffected status and Moisture Sensitivity Level 1 (Unlimited), matching the TOP258LN compliance profile.
Q: Which substitute part is closest in power rating to TOP258LN?
A: TOP256EG and TOP256EN both operate at 119W, which is the closest match to TOP258LN's 122W rating. TOP256EN has significantly higher inventory availability (27,159 pcs) compared to TOP256EG (1,266 pcs).
Q: Do all substitute parts operate at the same switching frequencies as TOP258LN?
A: Yes. All substitute parts operate at 66kHz and 132kHz switching frequencies, identical to TOP258LN. All maintain 78% duty cycle and -40°C ~ 150°C operating temperature range.
Q: What fault protection features are included in substitute parts?
A: All substitute parts include identical fault protection: Current Limiting, Over Temperature, and Over Voltage protection, matching TOP258LN specifications.
Q: Is the TOP258LN still manufactured?
A: No. TOP258LN is classified as obsolete. All substitute parts are active products with ongoing manufacturing support from Power Integrations.
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