SENSISTORS* Positive - Temperature Coefficient Silicon Thermistors FEATURES Qualified to MIL-T-23648A TG1/8 - Similar to RTH42 (MIL-T-23648A/19) @ TM1/8 - Similar to RTH22 (MIL-T-23648A/9) e Large Positive Temperature Coefficient = 0.7%/C @ Wide Resistance Value Ranges Available in 5% or 10% Tolerances TG1/8 TM1/8 RTH42 RTH22 TM1/4 DESCRIPTION The TG1/8 thermistor is encapsulated in a glass, hermeticaily sealed package. The T1/8 and TM1/4 thermistors are encap- sulated in a molded package. Both have hot solder-dipped leads and are used in temperature sensing and compensation circuits. They meet or exceed all of the requirements of MIL-T-23648A. ABSOLUTE MAXIMUM RATINGS TG1/8 1/8 TM1/4 RTH42 RTH22 Power Dissipation at (or below) 25C Free-Air Temperature (See Figure 1)...........2...2... 300mW....... 500mW......... 500mW..... Power Dissipation at (or below) 100C Free Air Temperature (See Figure 1).............. ccc cc ee eeee L25mW oo... c eee ee 250mW..... Operating Free-Air Temperature Range ....... 22... cece eee eee 95C to +125C ......-55C to +125C Storage Temperature Range ............ 00. cece nec e eee eect ees ~65C to +150C 22... ~65C to +150C MECHANICAL SPECIFICATIONS TG1/8 TG RTH42 c A INCHES MILLIMETERS A 020 + .002 508 + 051 | 0 @] _LOMIN. 25.4 MIN, 285 #015 7.239 4 381 | } fo D 095 #01 2413 + 254 I T 1/4 ~=TM1/8 RTH22 B c INCHES MILLIMETERS A 025 * 003 635 + 076 B]_LOMIN. 25.4 MIN. ca oe c 405 = 015 10.287 + 381 F D 144.015 3.556 + 381 A D a a Microsemi Corp. Watertown 4/82 9-4 The diode expertsTG1/8 TM1/8 TM1/4 RTH42 RTH22 ELECTRICAL AND THERMAL CHARACTERISTICS TG1/8 TM1/8 TM1/4 RTH42 = RTH22 Zero Power Resistance Ratio (R25C/R125C) oo. eee cece cece ee eeeeeeeees 0.55 + 15% ....... Thermai Time Constant - Typical .......... 0... c cece cece e ence en eneee 35S oo... eee Thermal Time Constant - Maximum ......... 0.0. cece c cent ese e ence eceeees 60s ....... 2... NOMINAL RESISTANCE AT VARIOUS TEMPERATURES Standard Zero Power Resis- Type No. Resistance (Q) of Sensistor at Temperature other than 25C tance Value (2) at 25C Free-Air Temperature -5 | -15C arc 50C 75 100C 125C 10 TG1/8 |) RTH42 | TM1/8 | RTH22 | TM1/4 [| 6.15 7.9 8.63 11.6 13.5 15.45 17.5 12 TG1/8 | RTH42 | TM1/8 | RTH22 | TM1/4 | 7.38 9.48 | 10.356 | 13.92 16.2 18.54 21 15 TG1/8 | RTH42 | TM1/8 | RTH22 | TM174 | 9.225 | 11.85 | 12.945] 17.4 20.25 | 23.175 26.25 18 TG1/8 | RTH42 | TM1/8 | RTH22 | TM1/4 | 11.07 | 14.22 | 15.534 | 20.88 24.3 27.81 31.5 - 22 TG1/8 | RTH42 ; TM1/8 | RTH22 | TM1/4 | 13.53 | 17.38 | 18.986 | 25.52 29.7 33.99 38.5 27 TG1/8 | RTH42 | TM1/8 | RTH22 | TM1/4 | 16.605 | 21.33 | 23.301 | 31.32 | 36.45 | 41.715 47.25 33 TG1/8 | RTH42 | TM1/8 | RTH22 | TM1/4 | 20.295 | 26.07 | 28.479} 38.9R | 4455 | 50985 57 75 39 TG1/8 | RTH42 [ TM1/8 | RTH22 | TM1/4 | 23.985 | 30.81 | 33.6571 45.24 | 52.65 | 60.255 68.25 47 TG1/8 | RTH42 | TM178 | RTH22 | TM1/4 | 28.905 | 37.13 | 40.561 | 54.52 | 63.45 | 72.615 82.25 50 TG1/8 | RTHA2 | TM1/8 | RTH22 | TM1/4 | 30.75 39.5 43.15 58 675 77.25 87.5 56 TG1/8 | RTH42 | TM1/8 | RTH22 | TM1/4 | 34.44 | 44.24 | 48.328 | 64.96 75.6 86.52 98 68 TG1/8 | RTH42 | TM1/8 | RTH22 | TM1/74 | 41.82 | 53.72 | 58.684 | 78.88 918 105.06 119 82 TG1/8| RTH42 | TM1/8 | RTH22 1 TM1/4 | 47.724 | 63.14 | 69.454 | 95.94 | 112.34 | 129.888 147.6 100 TGi/8 | RTH42 | TM1/8 | RTH22 | TM1/4 | 58.2 77 84.7 117 137 158.4 180 120 TG1/8| RTH42 | TM1/8 | RTH22 | TM1/4 | 69.84 924 | 101.64; 1404 | 1644 | 190.08 216 150 TG1/8 | RTH42 | TM1/8 | RTH22 | TM1/4 1] 87.3 115.5 | 127.05 | 175.5 | 205.5 237.6 270 180 TG1/8} RTH42 3 TM1/8 | RTH22 | TM1/4 | 100.8 | 135.9 | 150.84] 212.4 252 292.14 334.8 220 TG1/8;, RTH42 | TM1/8 | RTH22 | TM1/4 | 123.2 | 166.1 | 184.36] 259.6 308 357.06 409.2 270 TG1/8) RTH42 | TM1/8 | RTH22 | TM1/4 | 151.2 | 203.85 | 226.26) 318.6 378 438.21 502.2 330 TG1/8] RTH42 | TM1/8 | RTH22 | TM1/4 | 184.8 | 249.15 | 276.54) 389.4 462 535.59 613.8 390 TG1/8] RTH42 | TM1/8 | RTH22 | TM1/4 | 218.4 | 294.45 | 326.82} 460.2 546 632.97 725.4 470 TG1/8} RTH42 | TM1/8 | RTH22 | TM1/4 | 263.2 | 354.85 | 393.86 | 554.2 658 762.81 874.2 500 TG1/8| RTH42 |TM1/8] RTH22}7M1/4] 280 | 377.5 413 590 700 8115 |: 930 560 TG1/8{ RTH42 | TM1/8 | RTH22 | TM1/4 | 308 4144 | 467.6 672 795.2 | 927.36 | 1.0752 680 TG1/8} RTH42 | TML/8 | RTH22 | TM1/4 |] 374 503.2 | 567.8 816 965.6 | 1,126.08] 1,305.6 580 PLEASANT STREET WATERTOWN, MA 02172 TEL. (617) 926-0404 + FAX (617) 924-1235 9-5 PRINTED IN U.S.A.NOMINAL RESISTANCE AT VARIOUS TEMPERATURES TG1/8 TM1/8 TM1/4 RTH42 RTH22 Standard Zero Type No. Resistance (2) of Sensistor at Temperature other than 25C Power Resis- tance Value (Q) at 25C Free-Air Temperature -55 | -15C | oc | 50C | 75 100C | 125C 820 TG1/8 | RTH42 | TM1/8 | RTH22 | TM1/4 | 451 606.8 | 684.7 984 | 1,164.4) 1,357.92 | 1,574.4 1,000 TG1/8 | RTH42 | TM1/8 | RTH22 | TM174 550 740 835 1,200 1,420 1,656 1,920 1,200 TG1/8 | RTH42 | TM1/8 | RTH22 | TM1/4 | 660 888 1,002 {| 1,440 | 1,704 | 1,987.2 2,304 1.500 TG1/8 | RTH42 _ - TM1/4 | 772.5 | 1,095 |} 1,237.5] 1,845 | 2,175 2,505 2,940 - TM1/8 | RTH22 | TM1/4 | 825 1,110 |1,252.5} 1,800 | 2,130 2,484 2,880 1,800 TG1/8 | RTH42 | TM1/8 | RTH22 | TM1/4 | 927 1,314 | 1,485 } 2,214 | 2,610 3,006 3,528 2,200 TG1/8 | RTH42 | TM1/8 | RTH22 | TM1/4 | 1,133 | 1,606 | 1,815 | 2,706 | 3,190 3,674 4,312 2,700 TG1/8 | RTH42 | TM1/8 | RTH22 | TM1/4 {1,390.5; 1,971 | 2,27.5 | 3,321 | 3,915 4,509 5,292 3,300 TG1/8 _ TM1/8 | RTH22 | TM1/4 11,699.5| 2,409 | 2,722.5] 4,059 | 4,785 5,511 6,468 3,900 TG1/8 - TM1/8 | RTH22 | TM1/4 |2,008.5| 2,847 | 3,217.5] 4,797 | 5,655 6,513 7,644 4,700 TG1/8 - TM1/8 | RTH22 | TM1/4 [2,420.5] 3,431 | 3,877.5/ 5,781 | 6,815 7,849 9,212 5,000 TG1/8 _ T 1/8 | RTH22 | TM1/4 | 2,575 | 3,650 | 4,125 | 6,150 | 7,250 8,350 9,800 5,600 TG1/8 TM1/8 | RTH22 | TM1/4 | 2,884 | 4,088 | 4,620 | 6,888 | 8,120 9,352 10,976 6,800 TG1/8 - _ _ TM1/4 | 3,468 | 4,964 | 5,610 | 8,092 | 9,520 10,948 12,444 =_ TM1/8 | RTH22 | TM1/4 | 3,502 | 4,964 | 5,610 | 8,364 | 9,860 | 11,356 13,328 8,200 TG1/8 _ TM1/8 | RTH22 | TM1/4 | 4,182 | 5,986 | 6,765 | 9,758 | 11,480 | 13,202 15,006 _ _ TM1/8 | RTH22 | TM1/4 | 4,223 | 5,986 | 6,765 | 10,086 | 11,890 | 13,694 16,072 10,000 TG1/8 _ TM1/8 | RTH22 | TM1/4 15,100 | 7,300 | 8,250 | 11,900 | 14,000 | 16,100 18,300 = - TM1/8 | RTH22 | TM1/4 | 5,150 | 7,300 | 8,250 | 12,300 14,500 | 16,700 19,600 12,000 _ - TM1/8 _ _ 6,180 | 8,760 | 9,900 | 14,760 | 17,400 | 20,040 | 23,520 15,000 - TM1/8 _ _ 7,215 | 10,680 | 12,210 | 18,150 | 21,450 | 20,050 28,500 18,000 _ _ TM1/8 - _ 8,658 | 12,816 | 14,652 | 21,780 | 25,740 | 30,060 | 34,200 22,000 _ _- TM1/8 = _ 10,582 | 15,664 | 17,908 | 26,620 | 31,460 | 36,740 41,800 27,000 - _ TM1/8 - _ 12,987 | 19,224 | 21,978 ; 32,670 | 38,610 | 45,090 | 51,300 33,000 _ _ TM1/8 _ _ 15,873 | 23,496 | 26,862 | 39,930 | 47,190 | 55,110 | 62,700 39,000 - _ 1/8 _ _ 18,759 | 27,768 | 31,746 | 47,190 | 55,770 | 65,130 | 74,100 DEVICE TOLERANCE The actual resistance of the thermistor at T/C may vary from the calculated value by an amount not exceeding the tolerances tabulated below. Temperature 45% 10% CC) ce) {K) -55 +15% +20% -15 +9% 14% 0 +7% 412% 25 +5% 410% 50 +7% 412% 75 +9% 414% 100 +12% 417% 125 +15% 420% 980 PLEASANT STREET * WATERTOWN, MA 02172 TEL. (617) 926-0404 + FAX (617) 924-1235 9-6 PRINTED IN U.S.A.TG1/8 TM1/8 TM1/4 kL Dissipation Derating Curves 600 r ABSOLUTE MAXIMUM a RATING FOR TM1/4 = 500 L = ABSOLUTE MAXIMUM F RATING FOR TM1/8 & ABSOLUTE a 400 | MAXIMUM ~~ 2 RATING a FOR TG1/8 & 300 NN 2 3 00 4 N\ = RECOMMENDED xe RATING FOR TM1/4 e 100 {i N RECOMMENDED RATINGS FOR TM1/8 AND TG1/8 LL 4 0 25 50 75 100 125 T,FREE AIR TEMPERATURE (C) TYPICAL CHARACTERISTICS WITH POWER APPLIED To determine resistance value with power applied, obtain a muitiptying factor from the applicable curve beiow. The free-air curve is for the condition of heat removal by free-air convection only. The heat sink curve is for the maximum cooling rate condition of a heat sink strap, with leads attached to an infinite heat sink. Actual conditions encountered will be between these two extremes. After selecting an applicable multiplying factor from figure 2 or 3, multiply this by the 25C zero power resistance. This product is then corrected for the actual ambient termperature by use of the appropriate temperature column in the Nominal Resistance at Various Temperatures table. 2. Percent Resistance Change vs 3. Percent Resistance Change vs Power Dissipation Power Dissipation TM1/8 / RTH22 / TM1/4 TM1/8 / RTH42 / TM1/4 FREE-AIR Ty = 25C FREE-AIR Ta = 25C T SINK 1, =28Ct RESISTANCE MULTIPLYING FACTOR RESISTANCE MULTIPLYING FACTOR oO 100 200 300 400 0 50 100 150 200 POWER DISSIPATION(mW) POWER DISSIPATION (mW) +7, is lead temperature measured 1/16 inch from the body. tT. is lead temperature measured 1/16 inch from the body. PART NUMBER DESIGNATION (EXAMPLE) TM1/8272K 1/8 272 K ee STYLE WATTAGE RESISTANCE VALUE CODE TOLERANCE 1/8 270 = 27 1=5% TG 1/4 271 = 2700 K=10% RTH42 ES 272 = 2,7002 RTH22 ES 273 = 27,0000 580 PLEASANT STREET + WATERTOWN, MA 02172 TEL. (617) 926-0404 + FAX (617) 924-1235 9-7 PRINTED IN U.S.A.