0ZCF BEL
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Technical content
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2920 Chip
bel Surface Mount PTC. sissconiasnicsnis OZCF Series OZCF 0¢t2013D [HF]@ — OZCF Series Fuse & Ades ‘a 6-60V (per table) & z 40°C to 85°C ° a S Agency Approval BOY F TUV (Std. EN60738-1-1 , Cert. R50102117) Noe UL Component (Std. UL1434, File E305051) UL Conditions of Acceptability: 1.These devices have been investigated for use in safety circuits and are suitable as a limiting device. 5 5 limit the current to 8 amps within 5 All high-density boards seconds , per ANSI/NFPA 70, "National
2920 Chip Size, Fast Trip Timem, High Hold Currents
soon ne [| 300mA - 3A LEAD FREE -@8) Trip [Max Time to Trip Rated | Typical Agency Approvals Part Number |Current |Current [Curent] Tine | Votage | Power | Rmin | Rime | [mA | mA | A | See | tax. A| Vines Vic] Pow] Ohms | Ohms | - || ozcroosorrzc | 0.30 | ooo | 15 | 30 | to | 60 | 45 | 1000 | seo | y | v | |B| ozcroosorr2c | oso | 100 | 25 | 40 | to | 60 | 15 | oso | tao | y | | [ozcroarsarac | 075 | 160 | 80 | 03 | 10 | 60 | 45 | o1go | 1000 | ¥ | | |E[ozcrotasrr2c | 1.25 | 250 | so | 20 | 40 | 39 | 45 | 0050 | 020 | y | v | [F|ozcrossorr2c | 150 | 300 | a0 | 20 | 40 | 31 | 15 | 00s | azo |v |v _| [=| ozcrowesrrac | 195 | 270 | 00 | 25 | 40 | = | 15 | 00s | asso |v | v_| szcrozoorrac| 200 | 400 | eo | 45 | ao | 16 | 45 | ooss | ono | vy | vy | [ozcrozooar2c | 200 | 400 | 20 | so | 40 | m4 | 15 | 0035 | oso | ¥ | ¥ | | ozcrozsorr2c | 250 | 500 | so | 160 | 40 | 16 | 15 | 0025 | 0085 [s| ozcroasorr2c | 260 | 520 | a0 | 200 | 40 | 6 | 15 | 00m | ams |v | v_| szcrosoorr2c | 300 | 520 | 30 | 250 | 40 | 6 | 15 | oo | oo | y | v | [ozcrosooar2c | 3.00 | 520 | a0 | 250 7 40] is | ts | oto | oo | Ih Hold Current-maximum current at which the device will not trip in still air at 23°C. Ir Trip current-minimum current at which the device will always trip in still air at 23°C. Imax Maximum fault current device can withstand without damage at rated voltage (Vmax). Vmax Maximum voltage device can withstand without damage at its rated current. Pd Typical power dissipated by device when in tripped state in 23°C still air environment. Rmin Minimum device resistance at 23°C. Rimax Maximum device resistance at 23°C, 1 hour after initial device trip, or after being soldered to PCB in end application. Specifications subject to change without notice Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 + Tel: 201-432-0463 « Fax: 201-432-9542 - E-Mail: belfuse@belf.com Website: www.belfuse.com
Surface Mount PTC RoHS8 Compliant & Halogen Fee OZCF Series HEI@® 0ZcF oct2013¢ PTC’s — Basic Theory of Operation / “Tripped” Resistance Explanation Fundamentally, a Bel PTC consists of a block of polymeric material containing conductive filler and bonded between two conductive, planar terminations. At currents below the device IHOLD rating, AND at temperatures below 100C, the PTC maintains a resistance value below its R1 MAX rating. As the device's temperature approaches 130C, either due to an increase in ambient temperature or a current exceeding its | TRIP rating, volumetric expansion of the filled polymer breaks apart the majority of conductive pathways across the terminals created by chain contact of adjacent filler particles and device resistance increases sharply by several orders of magnitude. At the much higher “Tripped” resistance, there is just enough leakage current to allow internal heating to “hold” the device in its tripped state (around 125C) until power is interrupted. Once power is removed, the PTC's core cools and contracts allowing conductive chains to reform and return the device to its low resistance state. The catalog data for each device specifies a "Typical Power’ value. This is the power required to exactly match the heat lost by the tripped device to its ambient surroundings at 23C. By Ohm's Law, power can be stated as: W = E42/R. Thus the approximate resistance of a “Tripped” PTC can be determined by R = E*2MW, where "E" is the voltage appearing across the PTC (usually the supply's open circuit voltage), and "W" is the Typical Power value for the particular PTC. Since the PPTC acts to maintain a constant internal temperature, its apparent resistance will change based upon applied voltage and, to a lesser degree, ambient conditions. Consider the following example... APTC with a Typical Power of 1 watt protecting a circuit using a 60V supply will demonstrate an apparent, tripped resistance "R" of: R = 602/1 = 3,600 ohms This same tripped device when used to protect a 12V circuit would now present an apparent resistance of: R = 1292/1 = 144 ohms The value for Typical Power is "typical" because any physical factors that affect heat loss (such as ambient temperature or air convection) will somewhat alter the level of power that the PTC needs to maintain its internal temperature. In short, PTCs do not exhibit a constant, quantifiable tripped resistance value. (See Elec. Characteristics Table for P/N - Curve Correlation) AB C D EFGHIJK SSS ee ee A, SOE a o LLL LEE ATA AAW PAGAN RRR ao PSS ESA ANS EEE 2 7 —_L_ EL ELE TTA A _AEN QE ie es eo es ee ee a Se ee eee 2 — ON SES AOA EEE Boot ft NNN e SEER SOREL —— ES EE BONS a = ee ———— ee eee oor HL TITTY TTT 0.1 1 10 100 Fault Current (A) Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 + Tel: 201-432-0463 + Fax: 201-492-9542 - E-Mail: belfuse@belf.com Website: www.belfuse.com
bel Surface Mount PTC sesscasninsin 0ZCF 0ct2013D OZCF Series =e Thermal Derating Curve Cautionary Notes . . 4. Operation beyond the specified maximum ratings Hold & Trip Current and Thermal Derating Curve or improper use may result in damage and possible electrical arcing and/or flame. 300% 2. These Polymer PTC (PPTC) devices are intended - for protection against occasional overcurrent/ 5 overtemperature fault conditions and may not be s 250% suitable for use in applications where repeated andi 5 a LT] Device b and prot or prolonged fault conditions are anticipated. of cS 3. Avoid contact of PTC device with chemical solvent. os 2 200% hes, | Prolonged contact may adversely impact the PTC 3& Id performance. ZO som ME te performance | 4, These PTC devices may not be suitable for use in Sa — or a | LT | | {| circuits with a large inductance, as the PTC trip can = generate circuit voltage spikes above the PTC rated BE 100% voltage. st 5. These devices are intended for use in DC voltage Es ARRReeene lan [| applications only. Use in AC voltage applications 8 50% Devic ma esiste sta should be first discussed with Bel Fuse engineering = | 6. Not recommended for use on potted or conformal a o% coated PCB's. Restriction of free air flow could affect. 40 20 ° 2 o co eo electrical performance and/or result in device failure Consult Bel Fuse engineering. Ambient Temperature (‘C) 7. In the “Indeterminate Performance / grey zone”, tripping may occur but cannot be relied upon. For Hold Current == Trip Current special circumstances considering use within this region, consult Bel Fuse Engineering. 8.MSL : 2a (According to IPC J-Std-020). All dimensions in mm. [Dimensions [Marking Code ee ie <4 4£(050-0.20mm) a T | win [wx | Ges) | Gee | | ozcrooore2c | oso aas | oo [| B (4.80-5.44mm) [-ezcrowsorr2c [oso [15_[ ows [| | ozcroorser2c | o4o [1a | oos [| L feccrmsanc| ew [uw || a (e734 semmn | ozcrorsrrc | 040 | 090 | ons |_| Top and Bottom View | ozcrorsser2c [0.30 [090 [ores fT | ezcrozoorr2c | 0.30 | oso | ozo [| ee [ezcranrc [en [exe [|| z [ ezcreasreee [oso [ose [wee Side View id | ezcrozsorr2c | 0.30 | 090 | ozs [| | ozcroso0rF2c | 040 | 090 | os |_| [retomure [ows [us [| | The dimensions in the table below provide the recommended Matte Tin-plated Copper pad layout. | | | L {mm [inch | mm [inch | mm | inch | [ J [a0 [o2or [230 [ooo [560 [022 | s P s Specifications subject to change without notice Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 - Tel: 201-432-0463 - Fax: 201-432-9542 - E-Mail: belfuse@belf.com Website: www.belfuse.com
2920 Chi
Surface Mount PTC RoHS8 Compliant & Halogen-Free OZCF Series @ 0zcF 06t20130 Solder Reflow and Rework Recommendations ge Ramp-Up Rate (Temax to Tp ty" eae Prohest {in| ‘Temperature Min (Tsmin) 150 °C ft ‘Temperature Max (Tsmax) 200 *C 1 |: ee ‘Time (tsmin to tsmax) [60-180 seconds : [ave ‘Time maintained above: = —— ‘Temperature(T,) 217 s Time (u) {60-150 seconds — y~-- [Ramp-down] Peak/Classification Temperature(Tp):|260 ‘CS || ‘Time within 5°C of actual Peak : Goes | ‘Temperature (tp 20-40 seconds = d t25C to Peak “Tig Time 25°C to Peak Temperature: |Sminutesmax. _| Solder Reflow Due to " lead free / ROHS6 " construction of these PTC devices , the required Temperature and Dwell Time in the " Soldering "zone of the reflow profile are greater than those used for non-RoHS devices. 4.Recommended reflow methods ; IR , vapor phase oven , hot air oven. 2. Not Recommended For Wave Solder / Direct Immersion. 3. Recommended maximum ; paste thickness is 0.25mm. 4. Devices are compatible with standard industry cleaning solvents and methods. Caution If reflow temperature / dwell times exceed the recommended profile, the electrical performance of the PTC may be affected. Rework : MIL-STD-202G Method 210F. Test Condition A. Standard Packaging [Part Number | Tape/Reel Qty | 2000 fuses in 7 inches dia. Reel, 8mm wide QZCF OXXX X_X XX tape, 4mm pitch, per | pre sajeg — Eager (equivalent | oer mse Pare No ig et Rafer to Pat Number andl Ring in Eectial Charctrstics Table on Pt. Exctical Characteristics — F= Standard Design ‘AtoZ (except F)= Special, customer spec, DCR sort, et. Mechaneal Features). $a F= Standard Des AtoZ (ecoptF)= Special, cstoer spec, ad forming, se fips tod See standard packaging ‘Speetications subject to change without notice CORPORATE OFFICE FAR EAST OFFICE EUROPE OFFICE EUROPE Bel Fuse Inc. Bel Fuse Ltd. Bel Fuse Europe Ltd. Bel Stewart GmbH 206 Van Vorst Street 8/F Luk Hop Industrial Building Preston Technology Management Centre Industriestrasse 20 Jersey City, NJ 07302 8 Luk Hop Street Marsh Lane, Suite F15 61381 Friedrichsdorf Tel 201-432-0463 San Po Kong Preston, Lancashire, PR1 8UQ Germany Fax 201-432-9542 Kowloon, Hong Kong United Kingdom Tel 49-6172-9552-0 E-Mail: belfuse@belf.com Tel 852-2328-5515 Tel 44-1772-556601 Fax 49-6172-9552-40 Website: www. belfuse.com Fax 852-2352-3706 Fax 44-1772-561008