TFS758HG Equivalent & Substitute Parts

Part Overview

The TFS758HG is an offline converter IC manufactured by Power Integrations, designed for flyback and forward topology applications with isolated output. This device operates at 66kHz switching frequency and delivers up to 236W of power. The TFS758HG is classified as obsolete, making identification of functionally equivalent substitute parts essential for design continuity and procurement planning. Alternative components must maintain compatibility with the same topology, switching frequency, voltage specifications, and package configuration to ensure direct replacement capability.

Substiute Parts

TFS758HG

Power IntegrationsIn Stock: 7169TFS758HG Datasheet

Current PartRFQ

TFS7702H

Power IntegrationsIn Stock: 1154TFS7702H Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the TFS758HG is determined by strict alignment of the following critical parameters:

Topology Compatibility: Both the main part and substitute must support Flyback and Forward converter topologies to maintain circuit functionality.

Switching Frequency: The substitute must operate at 66kHz to ensure compatibility with existing transformer designs and control loop characteristics.

Package Configuration: The substitute must use the same 16-SSIP package with 12 leads, exposed pad, and formed leads to enable direct PCB mounting without redesign.

Voltage Specifications: Supply voltage range and breakdown voltage ratings must be compatible with the application's input and output requirements.

Isolation Capability: The substitute must provide isolated output configuration to maintain electrical isolation requirements in the target application.

Fault Protection Features: Current limiting, over-temperature, over-voltage, and short-circuit protection must be present to ensure equivalent safety performance.

Compliance Standards: RoHS compliance and MSL rating must match or exceed the original part specifications.

The TFS7702H qualifies as a substitute based on these criteria, with the following considerations documented in the parameter comparison table.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The TFS758HG is obsolete, making the TFS7702H the appropriate active substitute from Power Integrations' current product portfolio. The TFS7702H maintains active manufacturing status and ongoing technical support.

Compliance Alignment: Both parts are RoHS compliant with identical MSL ratings (1 - Unlimited), ensuring equivalent environmental and handling compliance for procurement and assembly processes.

Package and Mounting Compatibility: Both devices use the 16-SSIP package with through-hole mounting, enabling direct PCB replacement without layout modifications. However, the eSIP variant differs (eSIP-16B vs. eSIP-16F), requiring verification of pinout compatibility and lead configuration before implementation.

Topology and Frequency Alignment: The TFS7702H supports both 66kHz and 132kHz switching frequencies, with 66kHz operation matching the TFS758HG specification. This ensures compatibility with existing transformer designs and control loop parameters.

Functional Differences Requiring Evaluation: The TFS758HG integrates an internal switch, while the TFS7702H functions as a transistor driver controller. This architectural difference requires circuit redesign to accommodate external switching elements. Additionally, the TFS7702H maximum duty cycle (63%) is lower than the TFS758HG (70%), necessitating verification against application requirements.

Supply Voltage Specification: The TFS7702H supply voltage specification (up to 11.5V) requires confirmation that it accommodates the full TFS758HG operating range (11.1V ~ 13.4V). Minimum supply voltage specifications for both parts must be cross-referenced.

Isolation and Protection Features: Both parts support isolated output configurations and include comprehensive fault protection (current limiting, over-temperature, over-voltage, short-circuit), maintaining equivalent safety performance.

Frequently Asked Questions (FAQ)

Q: Can the TFS7702H be used as a direct pin-for-pin replacement for the TFS758HG?

A: Both parts use the 16-SSIP package with identical lead count and exposed pad configuration. However, the eSIP variant differs (eSIP-16B vs. eSIP-16F), requiring pinout verification. Additionally, the TFS7702H is a controller IC requiring external switching elements, while the TFS758HG integrates an internal switch. Direct PCB replacement is possible only if the circuit topology is redesigned to accommodate the controller architecture.

Q: What is the primary difference between the TFS758HG and TFS7702H?

A: The TFS758HG is an integrated offline converter with an internal switch, delivering up to 236W. The TFS7702H is a multi-topology controller IC that requires external transistor drivers. The TFS7702H offers dual-frequency operation (66kHz and 132kHz) and supports step-up/step-down configurations with dual outputs, providing greater design flexibility at the cost of additional external components.

Q: Are there compatibility issues with switching frequency?

A: The TFS7702H supports 66kHz operation, matching the TFS758HG specification. The additional 132kHz capability does not create compatibility issues; the device can be configured for 66kHz operation to maintain alignment with existing transformer and control loop designs.

Q: What must be verified before substituting the TFS7702H for the TFS758HG?

A: Verification must include: (1) eSIP pinout compatibility between eSIP-16B and eSIP-16F variants; (2) supply voltage range confirmation, particularly the minimum specification; (3) duty cycle requirements, as the TFS7702H maximum is 63% versus 70% for the TFS758HG; (4) circuit redesign accommodation for the controller architecture requiring external switching elements; (5) output configuration compatibility for isolated applications.

Q: Is the TFS7702H suitable for applications requiring 236W output power?

A: The TFS7702H is a controller IC without integrated power switching. Output power capability depends on external transistor selection and circuit design. The TFS758HG's 236W specification is an integrated device rating. Applications requiring equivalent power delivery must design external switching stages accordingly.

Q: Do both parts meet current environmental and compliance standards?

A: Yes. Both the TFS758HG and TFS7702H are RoHS compliant with MSL rating 1 (Unlimited), REACH unaffected status, and ECCN EAR99 classification. Both meet current environmental and export compliance requirements.

Q: What is the inventory status for substitution planning?

A: The TFS758HG (obsolete) has 7,109 pieces in stock. The TFS7702H (active product) has 1,121 pieces in stock. For long-term design continuity, the TFS7702H should be selected as the primary component for new designs, with the TFS758HG reserved for legacy system support only.