TEA1520T/N2,518 Equivalent & Substitute Parts

Part Overview

The TEA1520T/N2,518 is an offline switch flyback converter IC manufactured by NXP USA Inc., designed for isolated power management applications. This device operates in the 10kHz to 200kHz switching frequency range with a maximum power rating of 30W and supports supply voltages from 7.5V to 40V. The part is classified as Obsolete, necessitating identification of equivalent alternatives for new designs and ongoing production support.

Substiute Parts

TEA1520T/N2,518

NXP USA Inc.In Stock: 902TEA1520T/N2,518 Datasheet

Current PartRFQ

TEA1721AT/N1,118

NXP USA Inc.In Stock: 14358TEA1721AT/N1,118 Datasheet

MFR RecommendedRFQ

TEA1522T/N2,518

NXP USA Inc.In Stock: 1062TEA1522T/N2,518 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TEA1520T/N2,518 is determined by the following critical parameters:

Topology Match: All substitute parts must maintain Flyback converter topology for functional equivalence in isolated power applications.

Voltage Specifications: Substitute parts must support the required supply voltage range (7.5V ~ 40V minimum) and maintain comparable breakdown voltage ratings (650V or higher).

Switching Frequency Range: The 10kHz ~ 200kHz operating range defines the converter's operational envelope. Substitute parts with overlapping or compatible frequency ranges ensure design compatibility.

Power Rating: The 30W power capability is a primary design constraint. Substitute parts must meet or exceed this rating to handle equivalent load conditions.

Package Compatibility: The 14-SOIC package footprint is critical for PCB layout. Substitute parts with identical or compatible package specifications ensure mechanical and electrical fit.

Fault Protection Features: Current limiting, over-temperature, and short-circuit protection are mandatory safety functions. Substitute parts must provide equivalent protection mechanisms.

Control Features: Frequency control capability is essential for converter regulation. Substitute parts must support equivalent control methodologies.

Two substitute parts are identified based on these criteria, with different substitution classifications reflecting their relationship to the main part.

Parameter Comparison

Engineering Selection Recommendations

TEA1721AT/N1,118 (MFR Recommended Substitute)

This part is designated as the manufacturer-recommended alternative and carries Active product status, ensuring long-term availability and support. It maintains Flyback topology and surface-mount compatibility with identical package width specifications. The higher breakdown voltage (700V) provides enhanced voltage margin. However, this substitute operates at reduced power capacity (5W versus 30W) and narrower switching frequency range (22.5kHz ~ 50.5kHz versus 10kHz ~ 200kHz). The higher startup voltage (17V versus 9.5V) may require circuit topology adjustments. This substitute is suitable for applications where power requirements do not exceed 5W and frequency range constraints are acceptable.

TEA1522T/N2,518 (Parametric Equivalent)

This part provides the closest parametric match to the TEA1520T/N2,518, with identical power rating (30W), supply voltage range (7.5V ~ 40V), switching frequency range (10kHz ~ 200kHz), startup voltage (9.5V), and package specifications (14-SOIC). Fault protection and control features are equivalent. The product status is classified as Not For New Designs, indicating limited future availability. This substitute is appropriate for legacy system maintenance and production continuity where design parameters must remain unchanged.

Compliance Considerations

Both substitute parts maintain ROHS3 compliance and are manufactured by the same supplier (NXP USA Inc.), ensuring regulatory consistency. The TEA1721AT/N1,118 offers superior moisture sensitivity rating (MSL 1 versus MSL 2), providing extended storage capability without baking requirements.

Frequently Asked Questions (FAQ)

Q: Can TEA1721AT/N1,118 directly replace TEA1520T/N2,518 in existing designs?

A: Direct replacement is not recommended without circuit redesign. The TEA1721AT/N1,118 operates at 5W maximum power versus 30W for the original part, and its switching frequency range (22.5kHz ~ 50.5kHz) is narrower than the original (10kHz ~ 200kHz). The higher startup voltage (17V versus 9.5V) may require modifications to the bias supply circuit. This substitute is suitable only for applications with power requirements below 5W.

Q: What is the difference between "MFR Recommended" and "Parametric Equivalent" classifications?

A: The MFR Recommended substitute (TEA1721AT/N1,118) is the manufacturer's official alternative, carrying Active product status for long-term support. The Parametric Equivalent (TEA1522T/N2,518) matches the original part's electrical specifications more closely but has Not For New Designs status, limiting its suitability for new product development.

Q: Are package dimensions identical between all three parts?

A: No. The TEA1520T/N2,518 and TEA1522T/N2,518 both use 14-SOIC packages (0.154", 3.90mm width). The TEA1721AT/N1,118 uses an 8-SOIC package with 7 leads, requiring PCB layout modifications. Pin count and footprint differences necessitate circuit board redesign.

Q: Which substitute should be selected for new product designs?

A: The TEA1721AT/N1,118 is the appropriate choice for new designs, as it carries Active product status ensuring long-term availability and manufacturer support. However, design specifications must accommodate its 5W power limit and 22.5kHz ~ 50.5kHz frequency range.

Q: What are the moisture sensitivity implications for storage and handling?

A: The TEA1520T/N2,518 and TEA1522T/N2,518 have MSL 2 rating, requiring baking at 125°C for 24 hours after one year of storage. The TEA1721AT/N1,118 has MSL 1 rating with unlimited shelf life, eliminating baking requirements and reducing production handling complexity.

Q: Can the TEA1522T/N2,518 be used as a long-term production solution?

A: The TEA1522T/N2,518 is classified as Not For New Designs, indicating that NXP does not recommend it for new product development. While it may be available for legacy production support, its future availability is not guaranteed. For sustained production, the Active-status TEA1721AT/N1,118 is the more reliable choice, subject to design parameter compatibility.