İstif-class frigate

{{Infobox ship image

| image = TCG İstanbul (F-515) (cropped).jpg

| caption = TCG Istanbul (F-515) at the Bosporus strait, during the naval parade for celebrating the centennial of the Turkish Republic, October 29, 2023.

}}{{Infobox ship class overview

| Name = Istif class

| Builders = Istanbul Naval Shipyard

| Operators = {{naval|TUR}}

| Class before = {{sclass|Barbaros|frigate|4}}

| Class after =

| Subclasses =

| Cost =

| Built range = 2017–present

| In service range =

| In commission range = 2024-present

| Total ships planned = 8

| Total ships building = 5

| Total ships completed = 3

| Total ships active = 1

}}

{{Infobox ship characteristics

| Hide header =

| Header caption =

| Ship type = Multirole frigate

| Ship displacement = 3,100 tonnes

| Ship length = {{convert|113.2|m|ftin|abbr=on}}

| Ship beam = {{convert|14.40|m|ftin|abbr=on}}

| Ship height =

| Ship draught =

| Ship draft = {{convert|4.05|m|ftin|abbr=on}}

| Ship power = *4 x 560kw Generator{{cite web | url=https://www.savunmasanayist.com/milgem-i-sinifi-firkateyn/ | title=İ (İSTİF) Sınıfı Fırkateyn Özellikleri | SavunmaSanayiST | date=23 January 2023 }}

| Ship propulsion = *1 x GE LM2500 Gas turbine{{cite web | url=https://www.savunmasanayist.com/milgem-i-sinifi-firkateyn/ | title=İ (İSTİF) Sınıfı Fırkateyn Özellikleri | SavunmaSanayiST | date=23 January 2023 }}

• 2 x 5.766HP MTU Diesel Machine{{cite web | url=https://www.savunmasanayist.com/milgem-i-sinifi-firkateyn/ | title=İ (İSTİF) Sınıfı Fırkateyn Özellikleri | SavunmaSanayiST | date=23 January 2023 }}
• 2 x Controllable Pitch Propeller (CPP){{cite web | url=https://www.savunmasanayist.com/milgem-i-sinifi-firkateyn/ | title=İ (İSTİF) Sınıfı Fırkateyn Özellikleri | SavunmaSanayiST | date=23 January 2023 }}

| Ship speed = *Economy: {{convert|14|kn|abbr=on}}

• Maximum: {{convert|29|kn|abbr=on}}

| Ship range = {{convert|5,700|nmi|abbr=on}} at {{convert|14|kn|abbr=on}}{{cite web | url=https://www.savunmasanayist.com/milgem-i-sinifi-firkateyn/ | title=İ (İSTİF) Sınıfı Fırkateyn Özellikleri | SavunmaSanayiST | date=23 January 2023 }}

| Ship endurance =

| Ship boats = 2 x RHIB

| Ship complement = 123{{cite web | url=https://www.savunmasanayist.com/milgem-i-sinifi-firkateyn/ | title=İ (İSTİF) Sınıfı Fırkateyn Özellikleri | SavunmaSanayiST | date=23 January 2023 }}

| Ship time to activate =

| Ship sensors = *Radars: Cenk-400N 4D AESA search radar, ASELSAN ALPER-200N LPI Surface Radar, AKREP-300N (AKR-D Block B-1/2) Fire Control Radar,{{cite web | url=https://www.navalnews.com/naval-news/2021/01/turkey-launches-the-lead-ship-of-i-class-frigates-istanbul/ | title=Turkey launches the lead ship of I-class frigates "Istanbul" | date=23 January 2021 }}

• Systems: TAKS-100/76GFCS main gun fire control system, ATMACA 100/AFCS anti-ship missile fire control system, HİSAR 100N/FCS air defence missile fire control system, KULAÇ Sounder system, DEMES meteorological measurement system, AHTAPOT-100 Electro-optical director, PIRI-100 IRST, ANS 510-M gyro system,https://x.com/aselsan/status/1798304860083028132 {{Bare URL inline|date=August 2024}} LIAS 200-N Advanced Laser Warning Receiver System,{{cite web | url=https://www.savunmasanayist.com/milgem-i-sinifi-firkateyn/ | title=İ (İSTİF) Sınıfı Fırkateyn Özellikleri | SavunmaSanayiST | date=23 January 2023 }} Infrared Trace Management System,{{cite web | url=https://www.savunmasanayist.com/milgem-i-sinifi-firkateyn/ | title=İ (İSTİF) Sınıfı Fırkateyn Özellikleri | SavunmaSanayiST | date=23 January 2023 }} SeaEye-AHTAPOT EO Reconnaissance and Surveillance system{{cite web | url=https://www.navalnews.com/naval-news/2021/01/turkey-launches-the-lead-ship-of-i-class-frigates-istanbul/ | title=Turkey launches the lead ship of I-class frigates "Istanbul" | date=23 January 2021 }}
• Sonar: FERSAH 100N/MF hull mounted sonar{{cite web | url=https://www.navalnews.com/naval-news/2021/01/turkey-launches-the-lead-ship-of-i-class-frigates-istanbul/ | title=Turkey launches the lead ship of I-class frigates "Istanbul" | date=23 January 2021 }}
• Communications: SATCOM, Link 11/16, Link 22 Local Area Network, Internal Communication System, Underwater phone{{cite web | url=https://www.savunmasanayist.com/milgem-i-sinifi-firkateyn/ | title=İ (İSTİF) Sınıfı Fırkateyn Özellikleri | SavunmaSanayiST | date=23 January 2023 }}{{cite web | url=https://www.defenceturk.net/istanbul-firkateyni-envantere-girmeye-hazirlaniyor | title=İSTANBUL fırkateyni envantere girmeye hazırlanıyor | date=27 October 2023 }}
• Combat Systems: ADVENT Combat Management system,{{cite web | url=https://www.savunmasanayist.com/milgem-i-sinifi-firkateyn/ | title=İ (İSTİF) Sınıfı Fırkateyn Özellikleri | SavunmaSanayiST | date=23 January 2023 }} GEMS Integrated combat system, IdentIFF M5 TPX & I/LR IFF system, AcroSAT Ku-120-M Satellite combat system, AcroSAT Ku-150-M Satellite combat systemhttps://x.com/aselsan/status/1798304860083028132 {{Bare URL inline|date=August 2024}}

| Ship EW = *ESM: ASELSAN ARES 2N/NGE

• ECM: AREAS 2NC/E
• ARES-NEWS Central management system
• Decoy: Aselsan HIZIR Torpedo countermeasures system
• KARTACA-N Decoy ejection systemhttps://x.com/aselsan/status/1798304860083028132 {{Bare URL inline|date=August 2024}}

| Ship armament = *Guns:

• 1 × OTO Melara 76 mm Super Rapid or MKE National Naval Gun main gun{{cite web | url=https://www.savunmasanayist.com/milgem-i-sinifi-firkateyn/ | title=İ (İSTİF) Sınıfı Fırkateyn Özellikleri | SavunmaSanayiST | date=23 January 2023 }}
• 1 × Aselsan GOKDENIZ 35 mm dual barreled CIWS{{cite web | url=https://www.savunmasanayist.com/milgem-i-sinifi-firkateyn/ | title=İ (İSTİF) Sınıfı Fırkateyn Özellikleri | SavunmaSanayiST | date=23 January 2023 }}
• 2 × Aselsan STOP 25 mm RCWS{{cite web | url=https://www.savunmasanayist.com/milgem-i-sinifi-firkateyn/ | title=İ (İSTİF) Sınıfı Fırkateyn Özellikleri | SavunmaSanayiST | date=23 January 2023 }}
• Anti-ship missiles:
• 2 × 8 Atmaca anti-ship missiles{{cite web | url=https://www.savunmasanayist.com/milgem-i-sinifi-firkateyn/ | title=İ (İSTİF) Sınıfı Fırkateyn Özellikleri | SavunmaSanayiST | date=23 January 2023 }}
• Vertical launching system:
• 16-cell MIDLAS Vertical Launching System:
• up to 16 SAPAN or SIPER Block 1 Surface-to-air missiles{{cite web | url=https://www.savunmasanayist.com/milgem-i-sinifi-firkateyn/ | title=İ (İSTİF) Sınıfı Fırkateyn Özellikleri | SavunmaSanayiST | date=23 January 2023 }}{{cite web | url=https://www.savunmasanayist.com/ssbden-sapan-hava-savunma-fuzesi-mujdesi/ | title=SSB'den SAPAN Hava Savunma Füzesi müjdesi | SavunmaSanayiST | date=16 December 2023 }} or up to 64 smaller Hisar-D surface to air missiles
• Torpedoes:
• ZIPKIN 100/D Torpedo tube systemhttps://x.com/aselsan/status/1798304860083028132 {{Bare URL inline|date=August 2024}}
• 2 × {{convert|324|mm|in|abbr=on|0}} Triple Torpedo launchers with MK-46M5 or Orka Torpedoes{{cite web | url=https://www.savunmasanayist.com/milgem-i-sinifi-firkateyn/ | title=İ (İSTİF) Sınıfı Fırkateyn Özellikleri | SavunmaSanayiST | date=23 January 2023 }}

| Ship armour =

| Ship armor =

| Ship aircraft = *Hangar and platform for:

• S-70B Seahawk ASW helicopter
• Unmanned aerial vehicles (UAV)

| Ship notes =

}}