1N941 thru 1N946B-1 11.7 Volt Temperature Compensated Zener Reference Diodes SCOTTSDALE DIVISION APPEARANCE The popular 1N941 thru 1N946B series of Zero-TC Reference Diodes provides a selection of 11.7 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. 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 1N941 thru 1N946B series Standard reference voltage of 11.7 V +/- 5% with tighter tolerances also available 1N941B, 942B, 943B, 944B, 945B also have military qualification to MIL-PRF-19500/157 up to the JANTXV level by adding JAN, JANTX, or JANTXV prefixes to part numbers as well as "-1" suffix, e.g. JANTX1N944B-1, etc. Internal metallurgical bonds JANS Equivalent available via SCD Radiation Hardened devices available by changing "1N" prefix to "RH", e.g. RH944B, RH945B, etc. Also consult factory for "RH" data sheet brochure * * * * * * MAXIMUM RATINGS o MECHANICAL AND PACKAGING o * Operating & StorageTemperature: -65 C to +175 C * DC Power Dissipation: 500 mW @ TL = 25oC and maximum current IZM of 39 mA. NOTE: For optimum voltage-temperature stability, IZ = 7.5 mA (less than 95 mW in dissipated power) * Solder temperatures: 260 oC for 10 s (maximum) * * * * * * CASE: Hermetically sealed glass case with DO-7 (DO-204AA) package TERMINALS: Tin-lead plated 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 1N941 941 - 1N946B-1 * Copyright 2003 8-21-2003 REV A 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%/C to 0.0002%/C Tight reference voltage tolerances available at 11.7 V nominal values by adding the tolerance 1%, 2%, 3%, etc. after the part number for further identification e.g. 1N944B-2%, 1N945A-1%, 1N944B-1-1%, etc. Flexible axial-lead mounting terminals Nonsensitive to ESD per MIL-STD-750 Method 1020 1N941 thru 1N946B-1 11.7 Volt Temperature Compensated Zener Reference Diodes SCOTTSDALE DIVISION JEDEC TYPE NUMBER (Note 1, 5 & 6) 1N941 1N941A 1N941B 1N942 1N942A 1N942B 1N943 1N943A 1N943B 1N944 1N944A 1N944B 1N945 1N945A 1N945B 1N946 1N946A 1N946B ZENER VOLTAGE VZ @ IZT (Note 4) ZENER TEST CURRENT IZT MAXIMUM ZENER IMPEDANCE (Note 2) ZZT @ IZT MAXIMUM REVERSE CURRENT IR @ 8 V VOLTAGE TEMPERATURE STABILITY (Note 3 & 4) VZT MAXIMUM TEMPERATURE RANGE VOLTS 11.12-12.28 11.12-12.28 11.12-12.28 11.12-12.28 11.12-12.28 11.12-12.28 11.12-12.28 11.12-12.28 11.12-12.28 11.12-12.28 11.12-12.28 11.12-12.28 11.12-12.28 11.12-12.28 11.12-12.28 11.12-12.28 11.12-12.28 11.12-12.28 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 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 A 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 mV 88 181 239 44 90 120 18 36 47 9 18 24 4 9 12 1.8 3.6 4.7 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 VZ o %/ C 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. For tighter voltages tolerances, add a hyphenated suffix to the part number for desired tolerance at the end of the part number, e.g. 1N944B-2%, 1N945B-1%, 1N944B-1-1%, etc. o 2. Measured by superimposing 0.75 mA ac rms on 7.5 mA dc @ 25 C. 3. 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. 4. Voltage measurements to be performed 15 seconds after application of dc current. 5. The 1N941B, 1N942B, 1N943B, 1N944B, 1N945B also have military qualification to MIL-PRF-19500/157 up to the JANTXV level by adding JAN, JANTX, or JANTXV prefixes to part numbers as well as "-1" suffix, e.g. JANTX1N944B-1, JANTXV1N945B-1, etc. 6. Designate Radiation Hardened devices with "RH" prefix instead of "1N", i.e. RH944B instead of 1N944B. o o Change in temperature coefficient (%/ C) 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. EXAMPLE: A diode in this series is operated at a current of 7.5mA and has specified Temperature Coefficient (TC) limits of o +/-0.002%/ C. To obtain the typical Temperature Coefficient limits for this same diode operated at a current of 6.0mA, the new o TC limits (%/ C) can be estimated using the graph in FIGURE 1. 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 0.002% C and -0.0009%/ C gives the new estimated limits of +0.0011%/oC and -0.0029%/oC. IZ - Operating Current (mA) FIGURE 1 TYPICAL CHANGE OF TEMPERATURE COEFFICIENT WITH CHANGE IN OPERATING CURRENT. Copyright 2003 8-21-2003 REV A Microsemi Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503 Page 2 1N941 - 1N946B-1 Change in temperature coefficient (mV/ C) GRAPHS 1N941 thru 1N946B-1 11.7 Volt Temperature Compensated Zener Reference Diodes SCOTTSDALE DIVISION VZ - Change in Zener Voltage (mV) 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 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. IZ - Operating Current (mA) FIGURE 2 TYPICAL CHANGE OF ZENER VOLTAGE WITH CHANGE IN OPERATING CURRENT. DIMENSIONS 1N941 - 1N946B-1 All dimensions in INCH mm Copyright 2003 8-21-2003 REV A Microsemi Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503 Page 3