* CERTIFIED REFERENCE VOLTAGE STABILITY 1N4890 * TIME VOLTAGE STABILITY TO 10 PPM/1000 HOURS thru * 6.35 VOLTS NOMINAL + 5% 1N4895A * METALLURGICALLY BONDED (-1) DOUBLE PLUG CONSTRUCTION MAXIMUM RATINGS Operating Temperature: -65C to +175C Storage Temperature: -65C to +175C DC Power Dissipation: 500 mW @ +50C Power Derating: 3.33 mW / C above +50C This series of Ultra-Stable Reference Diodes offers a CERTIFIED REFERENCE VOLTAGE STABILITY measured over an operating period of 1000 hours. Standard stabilities are 10,20, and 50 PPM/1000 hours. Ultra-Stable Certified Reference Diodes are to be used in circuits that require an extremely high degree of voltage time stability. This series is subjected to a 1000 hour Stability Test Sequence, consisting of a 1000 hour power age with reference voltage measured once every 168 hours giving a total of 7 individual test points. The stability test is performed at 80C + 0.1C. A certificate containing the following data is supplied with each diode. 1. The stability test voltage readings. 2. The voltage drift as referenced to Zero Hour in pV. ELECTRICAL CHARACTERISTICS @ 25C VOLTAGE EFFECTIVE TIME VOLTAGE JEDEC | NOMINAL| ZENER | MAXIMUM | VOLTAGE EFFECTIVE STABILITY TIME TYPE ZENER | TEST ZENER TEMP. TEMP, TEMP. @a0c STABILITY NUMBER | VOLTAGE |CURRENT | IMPEDANCE| STABILITY | RANGE | COEFFICIENT INITIAL-TO-PEAK] INITIAL-TO- Vz@1z7} Iz7 Zzt@tzy |} Vz AVzT PEAK 45% | +0.01mA MAXIMUM (NOTE 1) | (NOTE 2) (NOTE 3) VOLTS mA OHMS mV C i? C u V/1000 HRS. | PPM /1000HRS. 1N4890 6.35 75 10 5.0 25 to 100 0.901 318 50 1N4890A | 6.35 7.5 10 10.0 -55 to 100 0.901 318 50 1N4891 6.35 75 10 2.5 25 to 100 0 0005 318 50 1N4891A | 6.35 75 10 5.0 -55 to 100 0.0005 318 50 1N4892 6.35 7.5 10 5.0 25 to 100 0.001 127 20 1N4892A | 6.35 75 10 10.0 -55 to 100 0.001 127 20 1N4893 6.35 75 10 25 25 to 100 0.0005 127 20 1N4893A | 6.35 75 10 5.0 -55 to 100 0.9005 127 20 1N4894 6.35 75 10 5.0 25 to 100 0001 64 10 1N4894A | 6.35 75 40 10.0 -55 to 100 0.961 64 10 1N4895 6.35 7.5 10 2.5 25 to 100 0.0005 64 10 1N4895A | 6.35 75 10 5.0 -55 to 100 0.0005 64 10 NOTE 1. Zener impedance is derived by superimposing on tz7 A 60Hz rms a.c. current equal to 10% of 177. NOTE 2 The maximum allowable change observed over the entire temperature range i-.e., the diode voltage will not exceed the specified mV at any discrete temperature between the established limits, per JEDEC standard No.5. NOTE 3. Under conditions of: +77 =7.5 MA + 0.0001 mA TA = 80C + 0.1C Epi COMPENSATED DEVICES INCORPORATED 166 TREMONT STREET, MELROSE, MASSACHUSETTS 02176 PHONE (617) 665-1071 FAX (617) 665-7379 WWWSITE: http://www.cdi-diodes.com E-mail: mail@ cdi-diodes.com 39CHANGE IN TEMPERATURE COEFFICIENT ( %/C) 40 1N4890 thru 1N4895A 500 100 oO +.0010 = 2 50 +.0005 N N uu 0 g q -.0005 a 10 -.0010 wy 8 N 55 60 65 70 75 80 85 90 95 1 OPERATING CURRENT |, (mA) 5 6 7 8 9 10 OPERATING CURRENT ly (mA) FIGURE 3 FIGURE 4 TYPICAL CHANGE OF TEMPERATURE ZENER IMPEDANCE COEFFICIENT WITH CHANGE IN VS. OPERATING CURRENT OPERATING CURRENT 20 | 10 VOLTAGE _ DEVIATION eee = IN PPM 0 10 20 168 336 504 672 840 1008 Operating Test Time in Hours Typical AVZT plot of a 1N4895 FIGURE 5