# İstif-class frigate

The Istif-class frigates are a group of eight multirole frigates currently being constructed for the Turkish Naval Forces. Developed under the MILGEM national warship program as the I-class frigate, the Istanbul class is an enlarged version of the Ada-class anti-submarine corvette, with enhanced endurance and MIDLAS Vertical Launching System (VLS) for multi-role capability. On 19 January 2017, Turkish Navy held a ceremonial steel cut for the lead ship TCG Istanbul (F 515). Istanbul was laid down on 3 July 2017 and launched on 23 January 2021.

## History and background

The Istif class has its origins in the Turkish MILGEM project for developing national warships and warship building industry. The program calls for the construction of a warship family in three classes, where all vessels would be designed with high degree of commonality. First product of the project emerged as Ada-class anti-submarine/patrol corvette. The Istanbul class, originally known as the TF-100 class under MILGEM-G designation, belongs to the second development phase, where structure of the Ada class vessel is extended to host multi-role capabilities.

## Design

The Istif class is an enlarged variant of the Ada class and will feature a slightly larger hull for improved endurance. In addition to retaining the guns, self protection and anti-submarine warfare systems of the Ada class, the Istif class will have twice the number of anti-ship missiles and will be equipped with the indigenous MDAS vertical launching system, capable of firing HISAR and other missiles, along with other systems for improved multi-role combat capabilities. The experience and technological know-how gained with the Istanbul class will play an important role in determining the design characteristics and the development process of the TF-2000-class destroyers, as well as the selection of the systems and equipment which will be used on these significantly larger and more capable warships.
The first ship of the class, TCG Istanbul, was laid down on 19 January 2017. The fifth and largest modern warship to be both indigenously designed and built in Turkey, it is claimed that at least 75% of its systems will be of indigenous manufacture. Its steel cutting ceremony was attended by Turkish Defence Minister Fikri Işık and senior military officers, including Admiral Bülent Bostanoğlu, Commander of the Turkish Naval Forces.
Construction took six years and the vessel was commissioned into service on 19 January 2024.

## Export

It was stated in Aselsan 2023 Annual report that İstif class frigate was exported to an unnamed Middle Eastern country.

## Ships in the class

| Pennant no. | Name | Namesake | Builder | Launched | Commissioned | Status | Note |
| F-515 | TCG Istanbul | Istanbul | Istanbul Naval Shipyard | 23 January 2021 | 19 January 2024 | In service | |
| F-516 | TCG İzmir | Izmir | Anadolu Shipyard | 10 January 2025 | | Planned | Launched |
| F-517 | TCG İzmit | İzmit | Sedef Shipyard | 11 January 2025 | | Planned | Launched |
| F-518 | TCG İçel | İçel | Sefine Shipyard | | | Planned | Under Construction |
| F-519 | TCG Akdeniz | Mediterranean Sea | Anadolu Shipyard | | | Planned | Under Construction |
| F-520 | TCG Karadeniz | Black Sea | Sedef Shipyard | | | Planned | Under Construction |
| F-521 | TCG Ege | Ege | Sefine Shipyard | | | Planned | |
| F-522 | TCG Marmara | Marmara | Anadolu Shipyard | | | Planned | |