1N935BUR-1 – 1N938BUR-1 CDLL935 – CDLL938B Qualified Levels: JAN, JANTX, JANTXV and JANS Temperature Compensated Zener Reference Diodes Available on commercial versions Qualified per MIL-PRF-19500/156 DESCRIPTION The popular 1N935BUR-1 through 1N938BUR-1 series of Zero-TC (Temperature Compensated) reference diodes provides a selection of 9.0 V nominal voltages and temperature coefficients to as low as 0.001 %/oC for minimal voltage change with temperature when operated at 7.5 mA. These glass surface mount DO-213AA reference diodes are also available in JAN, JANTX, JANTXV and JANS military qualifications. For commercial applications it is also available as RoHS compliant (not applicable to military). DO-213AA MELF Package Important: For the latest information, visit our website http://www.microsemi.com. FEATURES • • • • • • • Surface mount equivalent of JEDEC registered 1N935 through 1N938 number series. Standard reference voltage of 9.0V +/- 5%. Temperature compensated. Internal metallurgical bond. Double plug construction. JAN, JANTX, JANTXV and JANS qualification are available per MIL-PRF-19500/156. RoHS compliant versions available (commercial grade only). Also available in: DO-35 (DO-204AH) package (axial-leaded) 1N935B-1 – 1N938B-1 APPLICATIONS / BENEFITS • • • • • 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 0.001 %/ºC. MELF surface mount. Non-sensitive to ESD per MIL-STD-750 method 1020. MAXIMUM RATINGS @ T A = 25 ºC unless otherwise stated Parameters/Test Conditions Junction and Storage temperature (1) Power Dissipation Maximum Zener Current Solder Pad Temperatures at 10 s Symbol T J and T STG PD I ZM T SP Value -65 to +175 500 50 260 Unit o C mW mA o C Notes: 1. @ T EC = 50 oC (see figure 1). For optimum voltage-temperature stability, I Z = 7.5 mA (less than 50 mW in dissipated power). Derate at 3.33 mW/oC above T A = +25 oC. MSC – Lawrence 6 Lake Street, Lawrence, MA 01841 1-800-446-1158 Tel: (978) 620-2600 Fax: (978) 689-0803 MSC – Ireland Gort Road Business Park, Ennis, Co. Clare, Ireland Tel: +353 (0) 65 6840044 Fax: +353 (0) 65 6822298 Website: www.microsemi.com T4-LDS-0158, Rev. 2 (121998) ©2013 Microsemi Corporation Page 1 of 6 1N935BUR-1 – 1N938BUR-1 CDLL935 – CDLL938B MECHANICAL and PACKAGING • • • • • • • • CASE: Hermetically sealed glass case package. TERMINALS: Tin/lead plated or RoHS compliant matte-tin (on commercial grade only) over copper clad steel. Solderable per MIL-STD-750, method 2026. POLARITY: Cathode end is banded. MOUNTING: The axial coefficient of expansion (COE) of this device is approximately +6PPM/°C. The COE of the mounting surface system should be selected to provide a suitable match with this device. MARKING: Part number. TAPE & REEL option: Standard per EIA-296. Consult factory for quantities. WEIGHT: Approximately 0.04 grams. See Package Dimensions on last page. PART NOMENCLATURE JAN 1N935 B UR -1 e3 Reliability Level* JAN = JAN Level JANTX = JANTX Level JANTXV = JANTXV Level JANS = JANS Level Blank = Commercial *(available on “B” suffix only) RoHS Compliance e3 = RoHS compliant (available on commercial grade only) Blank = non-RoHS compliant Metallurgical Bond MELF Surface Mount JEDEC type number (see Electrical Characteristics table) SYMBOLS & DEFINITIONS Definition Symbol I ZM I Z , I ZT , I ZK VZ Z ZT or Z ZK Temperature Range Blank = 0 to +75 ºC A = -55 to +100 ºC B = -55 to +150 ºC (required for JAN level) Maximum Zener Current: The maximum rated dc current for the specified power rating. Regulator Current: The dc regulator current (I Z ), at a specified test point (I ZT ), near breakdown knee (I ZK ). Zener Voltage: The Zener voltage the device will exhibit at a specified current (I Z ) in its breakdown region. Dynamic Impedance: The small signal impedance of the diode when biased to operate in its breakdown region at a specified rms current modulation (typically 10% of I ZT or I ZK ) and superimposed on I ZT or I ZK respectively. T4-LDS-0158, Rev. 2 (121998) ©2013 Microsemi Corporation Page 2 of 6 1N935BUR-1 – 1N938BUR-1 CDLL935 – CDLL938B o ELECTRICAL CHARACTERISTICS @ 25 C unless otherwise specified ZENER VOLTAGE MAXIMUM ZENER IMPEDACE (Note 2) Z ZT VOLTAGE TEMPERATURE STABILITY ∆V ZT MAXIMUM (Note 3) TEMPERATURE RANGE V Z @ I ZT ZENER TEST CURRENT I ZT EFFECTIVE TEMPERATURE COEFFICIENT α VZ Volts mA Ohms mV °C % / °C CDLL935 CDLL935A CDLL935B 8.55 – 9.45 8.55 – 9.45 8.55 – 9.45 7.5 7.5 7.5 20 20 20 67 139 184 0 to +75 -55 to +100 -55 to +150 0.01 0.01 0.01 CDLL936 CDLL936A CDLL936B 8.55 – 9.45 8.55 – 9.45 8.55 – 9.45 7.5 7.5 7.5 20 20 20 34 70 92 0 to +75 -55 to +100 -55 to +150 0.005 0.005 0.005 1N937BUR-1 CDLL937 CDLL937A CDLL937B 8.55 – 9.45 8.55 – 9.45 8.55 – 9.45 7.5 7.5 7.5 20 20 20 13 28 37 0 to +75 -55 to +100 -55 to +150 0.002 0.002 0.002 1N938BUR-1 CDLL938 CDLL938A CDLL938B 8.55 – 9.45 8.55 – 9.45 8.55 – 9.45 7.5 7.5 7.5 20 20 20 6.7 13.9 19 0 to +75 -55 to +100 -55 to +150 0.001 0.001 0.001 MIL-PRF19500/156 1N935BUR-1 MSC TYPE NUMBER (Note 1) NOTE 1: Microsemi CDLL prefixed numbers are commercial use only. For high-reliability applications JAN prefixed 1N numbers must be selected along with the B suffix. NOTE 2: Zener impedance is derived by superimposing on I ZT A 60 Hz rms ac current equal to 10% of I ZT . NOTE 3: 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. T4-LDS-0158, Rev. 2 (121998) ©2013 Microsemi Corporation Page 3 of 6 1N935BUR-1 – 1N938BUR-1 CDLL935 – CDLL938B Pd, Rated Power Dissipation (mW) GRAPHS T EC , End Cap Temperature (C°) 3/8” from body Zener Impedance ZZT (Ohms) FIGURE 1 Power Derating Curve Operating Current I Z (mA) FIGURE 2 Zener Impedance vs. Operating Current T4-LDS-0158, Rev. 2 (121998) ©2013 Microsemi Corporation Page 4 of 6 1N935BUR-1 – 1N938BUR-1 CDLL935 – CDLL938B Change in Temperature Coefficient (%/°C) GRAPHS Operating Current I Z (mA) FIGURE 3 Typical Change of Temperature Coefficient with Change in Operating Current T4-LDS-0158, Rev. 2 (121998) ©2013 Microsemi Corporation Page 5 of 6 1N935BUR-1 – 1N938BUR-1 CDLL935 – CDLL938B PACKAGE DIMENSIONS DIM BD BL ECT S INCH MIN MAX 0.063 0.067 0.130 0.146 0.016 0.022 0.001 - MILLIMETERS MIN MAX 1.60 1.70 3.30 3.71 0.41 0.56 0.03 - NOTES: 1. Dimensions are in inches. Millimeters are given for general information only. 2. Dimensions are pre-solder dip. 3. Referencing to dimension S, minimum clearance of glass body to mounting surface on all orientations. 4. In accordance with ASME Y14.5M, diameters are equivalent to Φx symbology. PAD LAYOUT A B C T4-LDS-0158, Rev. 2 (121998) ©2013 Microsemi Corporation INCH 0.200 0.055 0.080 mm 5.08 1.40 2.03 Page 6 of 6