TELEDYNE RELAYS SERIES 421 ESTABLISHED RELIABILITY TO-5 RELAYS SPDT MAGNETIC LATCHING SERIES DESIGNATION RELAY TYPE 421 SPDT basic relay 421D SPDT relay with internal diode for coil transient suppression 421DD SPDT relay with internal diodes for coil transient suppression and polarity reversal protection DESCRIPTION The 421D and 421DD Series utilizes internal discrete silicon diodes for coil suppression and polarity reversal protection. The TO-5 relay, originally conceived and developed by Teledyne, has become one of the industry standards for low level switching from dry circuit to 0.5 ampere. Designed expressly for high density PC Board mounting, its small size and low coil power dissipation make the TO-5 relay one of the most versatile ultraminiature relays available. By virtue of its inherently low intercontact capacitance and contact circuit losses, the TO-5 relay has shown itself to be an excellent ultraminiature RF switch for frequency ranges well into the UHF spectrum. A typical RF application for the TO-5 relay is in hand held radio transceivers, wherein the combined features of good RF performance, small size, low coil power dissipation and high reliability make it a preferred method of Transmitter-Receive switching (see Figure 1). The following unique construction features and manufacturing techniques provide excellent resistance to environmental extremes and overall high reliability: • All welded construction. • Unique uni-frame design providing high magnetic efficiency and mechanical rigidity. • High force/mass ratios for resistance to shock and vibration. • Advanced cleaning techniques provide maximum assurance of internal cleanliness. • Precious metal alloy contact material with gold plating assures excellent high current and dry circuit switching capabilities. The 421 Series magnetic latching relays are ideally suited for applications where power dissipation must be minimized. The relays can be operated with a short duration pulse. After contacts have transferred, no external holding power is required. The magnetic latching feature of the 421 Series provides a “memory” capability, since the relays will not reset upon removal of power. PRINCIPLE OF OPERATION Energizing Coil B produces a magnetic field opposing the MAGNETIC CIRCUIT A PERMANENT MAGNET holding flux of the permanent magnet in Circuit B. As this MAGNETIC CIRCUIT B SOFT IRON CORE A net holding force decreases, the attractive force in the air gap of Circuit A, which also results from the flux of the COIL A COIL B permanent magnet, becomes great enough to break the armature free of Core B, and snap it into a closed position SOFT IRON SOFT IRON CORE A CORE B against Core A. The armature then remains in this position AIR GAP upon removal of power from Coil B, but will snap back SOFT IRON MOVING into position B upon energizing Coil A. Since operation ARMATURE CONTACT depends upon cancellation of a magnetic field, it is necessary to apply the correct polarity to the relay coils as indicated on the relay schematic. STATIONARY CONTACT When latching relays are installed in equipment, the latch and reset coils should not be pulsed simultaneously. Coils should not be pulsed with less than the nominal coil voltage and the pulse width should be a minimum of three times the specified operate time of the relay. If these conditions are not followed, it is possible for the relay to be in the magnetically neutral position. 41 ENVIRONMENTAL AND PHYSICAL SPECIFICATIONS Temperature (Ambient) -65°C to + 125°C Vibration 30 g’s to 3000 Hz (Note 1) Shock 100 g’s for 6 msec. (Note 1) half-sine Acceleration 50 g’s (Note 1) Enclosure All welded, hermetically sealed Weight 0.089 oz (2.52 gms.) max. SERIES 421 GENERAL ELECTRICAL SPECIFICATIONS (-65°C to +125°C unless otherwise noted) (Notes 2 & 7) Contact Arrangement Rated Duty Contact Resistance Contact Load Rating (DC) (See Fig. 2 for other DC resistive voltage/current ratings) 1 Form C (SPDT) Continuous 0.125 ohm max. before life; 0.225 ohm max. after life at 0.5A/28VDC, (measured 1/8” from header) Resistive: 0.5 Amp/28VDC Inductive: 200 mA/28VDC (320 mH) Lamp: 100 mA/28VDC Low Level: 10 to 50 µA/10 to 50 mV Resistive: 250 mA/115VAC, 60 and 400Hz (Case not grounded) 100 mA/115VAC, 60 and 400Hz (Case grounded) 10,000,000 cycles (typical) at low level 00,100,000 cycles min. at all other loads specified above 2A/28VDC Resistive (100 cycles min.) Contact factory 290 milliwatts typical at nominal rated voltage @ 25°C 1.5 msec max. at nominal rated coil voltage 1.5 msec max. 4.5 msec @ nominal voltage 0.4 pf typical 10,000 megohms min. between mutually isolated terminals Atmospheric pressure: 500 VRMS/60 Hz 70,000 ft.: 125 VRMS/60Hz Contact Load Ratings (AC) Contact Life Ratings Contact Overload Rating Contact Carry Rating Coil Operating Power Operate Time Contact Bounce Minimum Operate Pulse lntercontact Capacitance Insulation Resistance Dielectric Strength Diode P.I.V. 421D, 421DD Negative Coil Transient 421D, 421DD 100 VDC min. 1.0 VDC max. DETAILED ELECTRICAL SPECIFICATIONS (-65°C to +125°C unless otherwise noted) (Note 7) BASE PART NUMBERS (See Note 9 for full P/N Example Coil Voltage (VDC) 421-5 421D-5 421DD-5 ➧ Nom. Max. 421, 421D 421DD (Note 3) Min. Max. 421 421D 421DD Coil Resistance (Ohms ± 10% @ 25°C) Coil Current (mADC @ 25°C) 421DD Series only Set & Reset Voltage (VDC, Max.) 5.0 6.0 61 48 78.0 111.8 3.5 3.7 4.5 421-6 421D-6 421DD-6 421-9 421D-9 421DD-9 421-12 421D-12 421DD-12 421-18 421D-18 421DD-18 421-26 421D-26 421DD-26 6.0 8.0 120 97 45.8 63.0 4.5 4.5 5.5 9.0 12.0 280 280 25.7 34.9 6.8 6.8 7.8 12.0 16.0 500 500 19.6 26.7 9.0 9.0 10.0 18.0 24.0 1130 1130 13.4 18.8 13.5 13.5 14.5 26.5 32.0 2000 2000 11.2 15.2 18.0 18.0 19.0 PERFORMANCE CURVES (NOTE 2) TYPICAL RF PERFORMANCE TYPICAL DC CONTACT RATING (RESISTIVE) 0 .1 300 INSER TION .3 LOSS LOAD VOLTAGE (VDC) .2 10 1.92 20 N LOSS RETUR 30 1.22 SWR) (V 1.07 40 50 60 1.02 TACTS S CON CROS NA OLATIO 1.01 VSWR dB .4 70 200 150 100 50 1.00 IS 250 1.00 .01 0.5 .1 .5 1.0 0 0.1 0.2 0.3 0.4 0.5 0.6 FREQUENCY (GHz) LOAD CURRENT (AMPS DC) FIGURE 1 FIGURE 2 42 0.7 0.8 0.9 1.0 SERIES 421 OUTLINE DIMENSIONS TERMINAL LOCATIONS AND PIN NUMBERING (REF. ONLY) (Viewed from Terminals) SCHEMATIC DIAGRAMS CASE DETAIL .370 (9.40) DIA. MAX. .031 (.79) ± .003 (0.08) COIL B .335 (8.51) DIA. MAX. 36° ±3° TYP. 9 .035 (.89) ± .010 (0.25) 1 .280 (7.11) MAX. COIL A 2 8 7 .200 (5.08) ± .010 (.25) DIA. 421 6 4 WIRE LEAD: .75 (19.05) MIN. PIN: .187 (4.75) ± .010 (.25) (See Note 5) COIL B +.002 (.05) .017 (.43) –.001 (.03) DIA. DIMENSIONS ARE SHOWN IN INCHES (MILLIMETERS) SPACER PAD SPREADER PAD Relays can be supplied with a spacer pad attached to the relay header. The pad permits the relay to be spaced away from the mounting surface facilitating solder joint inspection. To order add M4 to the part number (e.g. ER421M4-26A). Relays can be supplied with spreader pads which are attached to the relays. Spreader pads can be supplied by adding M to the part number (e.g. ER421M-26A). .370 50 MAX (9.40) .150 (3.81) COIL A 421D COIL B .100 (2.54) .100 (2.54) .300 (7.62) COIL A .305 MAX. (7.75) .200 (5.08) (.41) .016 .18 .007 421DD .398 MAX (10.11) NOTES: NOTES: SCHEMATICS ARE VIEWED FROM TERMINALS 1. Material: Diallyl Phthalate. 2. Increase contact resistance by 0.025 ohm. 3. Spreader pad conform to MIL-M-38527. 1. Material: Polyester film. 2. Increase contact resistance by 0.01 ohm. COIL A LAST ENERGIZED NOTES: 1. 2. 3. 4. 5. Relay contacts will exhibit no chatter in excess of 10 µsec or transfer in excess of 1 µsec. “Typical” characteristics are based on available data and are best estimates. No on-going verification tests are performed. For reference only. Coil resistance not directly measurable at relays terminals due to internal series semiconductor. 421DD only. Screened HI-REL versions available. Contact factory. Unless otherwise specified, relays will be supplied as follows: Length will be standard 0.75” (19.05) minimum and will be either gold plated or solder coated. Contact your local representative for ordering information. 6. The slash and characters appearing after the slash are not marked on the relay. 7. Unless otherwise specified, parameters are initial values. 8. RELIABILITY LEVEL FAILURE RATE %/10,000 CYCLES A 1.5 B 0.75 9. Teledyne Part Numbering System for Established Reliability Relays (See T2R® Program Introduction) EXAMPLE: ER 421 D Z M4 – 26 A / SQ Established Reliability Designator Termination Variant Q = Solder Coated Leads (Notes 5 and 6) S = .187” Leads (Notes 5 and 6) Relay Series Reliability and Screening Level (Note 8) D = Diode Suppression DD = Diode Suppression and Polarity Protection Coil Voltage Mounting Variant Ground Pin (See page 112) M = Spreader Pad M4 = Spacer Pad ©1996 TELEDYNE RELAYS 43 12525 Daphne Avenue Hawthorne, California 90250