DESCRIPTION The popular 1N821 thru 1N829 series of Zero-TC Reference Diodes provides a selection of both 6.2 V and 6.55 V nominal voltages and temperature coefficients to as low as 0.0005%/oC for minimal voltage change with temperature when operated at 7.5 mA. These glass axialleaded DO-7 reference diodes are also available in JAN, JANTX, JANTXV, and JANS military qualifications. Microsemi also offers numerous other Zener Reference Diode products for a variety of other voltages 200 V.

JEDEC registered 1N821 thru 1N829 series Internal metallurgical bonds Double anode option with 1N822 and 1N824 selection Reference voltage selection V +/-5% with further tight tolerance options at nominal 825, 827 and 829 also have military qualification up to the JANS level by adding JAN, JANTX, JANTXV, or JANS prefixes to part numbers as well as the "-1" suffix, e.g. JANTX1N829-1, etc. Radiation Hardened devices available by changing "1N" prefix to "RH", e.g. 829, RH829A, etc. Also consult factory for "RH" data sheet brochure Military surface mount equivalents also available in DO-213AA with UR-1 suffix and JAN, JANTX, or JANTXV prefix, e.g. JANTX1N829UR-1 (see separate data sheet) Also available in smaller axial-leaded DO-35 package (see separate data sheet)

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 to 0.0005%/�C Tight voltage tolerances with nominal reference voltages 6.35 V available by adding tolerance 2%, 3%, etc. after the part number for identification e.g. -1%, 1N8291-1%, etc. Flexible axial-lead mounting terminals Nonsensitive to ESD per MIL-STD-750 Method 1020

Operating & StorageTemperature: C DC Power Dissipation: = 25oC and maximum current IZM of 70 mA. NOTE: For optimum voltage-temperature stability, 7.5 mA (less than 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 (except double anode 1N822 and 1N824) 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

Scottsdale Division 8700 E. Thomas Rd. PO Box 1390, Scottsdale, AZ 85252 USA, (480) 941-6300, Fax: (480) 947-1503

ZENER VOLTAGE (Note 1 and VZ @ IZT ZENER TEST CURRENT IZT MAXIMUM ZENER IMPEDANCE (Note 2) ZZT @ IZT MAXIMUM REVERSE CURRENT 3 V VOLTAGE TEMPERATURE STABILITY (VZT MAX) +100 C (Note 3 and 4) EFFECTIVE TEMPERATURE COEFFICIENT

NOTES: Add a "-1" suffix for internal metallurgical bond. When ordering devices with tighter tolerances than specified for the VZ voltage nominal 6.35 V, add a hyphened suffix to the part number for desired tolerance, e.g. 1N829A-1%, 1N829A-1-1%, etc. o Zener impedance measured by superimposing mA ac rms 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 discrete temperature between the established limits. Voltage measurements to be performed 15 seconds after application of dc current. 1N825, 1N827, and 1N829 also have qualification MIL-PRF-19500/159 by adding the JAN, JANTX, JANTXV, or

Designate Radiation Hardened devices with "RH" prefix instead of "1N", e.g. RH829A instead of 1N829A.

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 C. To obtain the typical Temperature Coefficient limits for this same diode operated at a current of 6.0mA, the o new TC limits C) can be estimated using the graph in FIGURE At a test current of 6.0mA the change in Temperature Coefficient o (TC) is approximately �0.0006%. C. The algebraic sum of +/o 0.005% C and �0.0006%/ C gives the estimated limits +0.0044%/ C and -0.0056%/ C.

This curve in Figure 2 illustrates the change of diode voltage arising from the effect of impedance. 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.