1N935 thru 1N940B-1, e3 9.0 Volt Temperature Compensated Zener Reference Diodes SCOTTSDALE DIVISION APPEARANCE The popular 1N935 thru 1N940B series of Zero-TC Reference Diodes provides a selection of 9.0 V nominal voltages and temperature coefficients to as low as 0.0002%/oC for minimal voltage change with temperature when operated at 7.5 mA. These glass axial-leaded DO-7 reference diodes are also available in JAN, JANTX, and JANTXV military qualifications. For commercial applications it is also available as RoHS Compliant with an e3 suffix (not applicable to military). Microsemi also offers numerous other Zener Reference Diode products for a variety of other voltages from 6.2 V to 200 V. DO-7 (DO-204AA) WWW . Microsemi .C OM DESCRIPTION IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com FEATURES • • • • • • • APPLICATIONS / BENEFITS JEDEC registered 1N935 thru 1N940 series Standard reference voltage of 9.0V +/- 5% 1N935B, 937B, 938B, 939B, 940B also have military qualification to MIL-PRF-19500/156 up to the JANTXV level by adding JAN, JANTX, or JANTXV prefixes to part numbers as well as “-1” suffix, e.g. JANTX1N938B-1, etc. Internal metallurgical bonds JANS Equivalent available via SCD Radiation Hardened devices available by changing “1N” prefix to “RH”, e.g. RH938B, RH 940B, etc. Also consult factory for “RH” data sheet brochure RoHS compliant devices available by adding an “e3” suffix (not applicable to military) • • • • • • MAXIMUM RATINGS • • MECHANICAL AND PACKAGING o Operating & StorageTemperature: -65 C to +175 C DC Power Dissipation: 500 mW @ TL = 25oC and maximum current IZM of 50 mA. NOTE: For optimum voltage-temperature stability, IZ = 7.5 mA (less than 75 mW in dissipated power) o Solder temperatures: 260 C for 10 s (maximum) • • • • • • • Copyright © 2005 7-18-2005 REV B CASE: Hermetically sealed glass case with DO-7 (DO-204AA) package TERMINALS: Tin-lead (military) or RoHS Compliant annealed matte-Tin plating and solderable per MIL-STD-750, Method 2026 MARKING: Part number and cathode band POLARITY: Reference diode to be operated with the banded end positive with respect to the opposite end TAPE & REEL option: Standard per EIA-296 (add “TR” suffix to part number) WEIGHT: 0.2 grams. See package dimensions on last page Microsemi Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503 Page 1 1N935 - 1N940B-1, e3 • o Provides minimal voltage changes over a broad temperature range For instrumentation and other circuit designs requiring a stable voltage reference Maximum temperature coefficient selections available from 0.01%/ºC to 0.0002%/ºC Tight voltage tolerances available with nominal voltage of 9.2 V by adding tolerance 1%, 2%, 3%, etc. after the part number for further identification, e.g. 1N938B-2%, 1N940B-1%, 1N939B-1-1%, etc. Flexible axial-leaded mounting terminals Nonsensitive to ESD per MIL-STD-750 Method 1020 1N935 thru 1N940B-1, e3 9.0 Volt Temperature Compensated Zener Reference Diodes SCOTTSDALE DIVISION JEDEC TYPE NUMBERS (Notes 1 & 5) 1N935 1N935A 1N935B 1N936 1N936A 1N936B 1N937 1N937A 1N937B 1N938 1N938A 1N938B 1N939 1N939A 1N939B 1N940 1N940A 1N940B ZENER VOLTAGE VZ @ IZT (Notes 1, 4 & 5) ZENER TEST CURRENT IZT MAXIMUM ZENER IMPEDANCE (Note 2) ZZT @ IZT MAXIMUM REVERSE CURRENT IR @ 6 V VOLTAGE TEMPERATURE STABILITY (Notes 3 & 4) ΔVZT MAXIMUM TEMPERATURE RANGE VOLTS 8.55-9.45 8.55-9.45 8.55-9.45 8.55-9.45 8.55-9.45 8.55-9.45 8.55-9.45 8.55-9.45 8.55-9.45 8.55-9.45 8.55-9.45 8.55-9.45 8.55-9.45 8.55-9.45 8.55-9.45 8.55-9.45 8.55-9.45 8.55-9.45 mA 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 OHMS 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 μA 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 mV 67 139 184 33 69 92 13 27 37 6 13 18 3 7 9 1.3 2.7 3.7 C 0 to +75 -55 to +100 -55 to +150 0 to +75 -55 to +100 -55 to +150 0 to +75 -55 to +100 -55 to +150 0 to +75 -55 to +100 -55 to +150 0 to +75 -55 to +100 -55 to +150 0 to +75 -55 to +100 -55 to +150 o EFFECTIVE TEMPERATURE COEFFICIENT αVZ %/oC 0.01 0.01 0.01 0.005 0.005 0.005 0.002 0.002 0.002 0.001 0.001 0.001 0.0005 0.0005 0.0005 0.0002 0.0002 0.0002 WWW . Microsemi .C OM *ELECTRICAL CHARACTERISTICS @ 25oC, unless otherwise specified *JEDEC Registered Data. NOTES: 1. When ordering devices with tighter tolerances than specified, use a nominal voltage of 9.2V and add a hyphenated suffix to the part number for desired tolerance at the end of the part number, e.g. 1N938B-2%, 1N939B-1%, 1N939B-1-1%, etc. o Measured by superimposing 0.75 mA ac rms on 7.5 mA dc @ 25 C. The maximum allowable change observed over the entire temperature range i.e., the diode voltage will not exceed the specified mV change at any discrete temperature between the established limits. Voltage measurements to be performed 15 seconds after application of dc current. 2. 3. 4. 5. 6. The 1N935B, 937B, 938B, 939B, 940B also have military qualification to MIL-PRF-19500/156 up to the JANTXV level by adding JAN, JANTX, or JANTXV prefixes to part numbers as well as “-1” suffix, e.g. JANTX1N938B-1, etc. Designate Radiation Hardened devices with “RH” prefix instead of “IN”, i.e. RH938A instead of 1N938A. o o Change in temperature coefficient (%/ C) Change in temperature coefficient (mV/ C) GRAPHS The curve shown in Figure 1 is typical of the diode series and greatly simplifies the estimation of the Temperature Coefficient (TC) when the diode is operated at currents other than 7.5mA. At a test current of 6.0mA the change in Temperature Coefficient o (TC) is approximately –0.0009%. C. The algebraic sum of +/o o 0.005% C and –0.0009%/ C gives the new estimated limits of +0.0041%/oC and -0.0059%/oC. IZ – Operating Current (mA) FIGURE 1 TYPICAL CHANGE OF TEMPERATURE COEFFICIENT WITH CHANGE IN OPERATING CURRENT. Copyright © 2005 7-18-2005 REV B Microsemi Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503 Page 2 1N935 - 1N940B-1, e3 EXAMPLE: A diode in this series is operated at a current of 7.5mA and has specified Temperature Coefficient (TC) limits of +/o 0.005%/ C. To obtain the typical Temperature Coefficient limits for this same diode operated at a current of 6.0mA, the new TC limits o (%/ C) can be estimated using the graph in FIGURE 1. 1N935 thru 1N940B-1, e3 9.0 Volt Temperature Compensated Zener Reference Diodes This curve in Figure 2 illustrates the change of diode voltage arising from the effect of impedance. It is in effect an exploded view of the zener operating region of the I-V characteristic. In conjunction with Figure 1, this curve can be used to estimate total voltage regulation under conditions of both varying temperature and current. WWW . Microsemi .C OM ΔVZ – Change in Zener Voltage (mV) SCOTTSDALE DIVISION IZ – Operating Current (mA) FIGURE 2 TYPICAL CHANGE OF ZENER VOLTAGE WITH CHANGE IN OPERATING CURRENT. DIMENSIONS 1N935 - 1N940B-1, e3 All dimensions in INCH mm Copyright © 2005 7-18-2005 REV B Microsemi Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503 Page 3