SERIES MAGNETIC-LATCHING ESTABLISHED RELIABILITY TO-5 RELAYS 421 SPDT SERIES DESIGNATION 421 421D 421DD RELAY TYPE SPDT basic relay SPDT relay with internal diode for coil transient suppression SPDT relay with internal diodes for coil transient suppression and polarity reversal protection DESCRIPTION The Series 421D and 421DD utilize discrete silicon diodes for coil suppression and polarity reversal protection. The magnetic-latching 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 for high-density PC board mounting, its small size and low coil power dissipation make the 421 relay one of the most versatile ultraminiature relays available. 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 contacts material with gold plating assures excellent high current and dry circuit switching capabilities. PERMANENT MAGNET PRINCIPLE OF OPERATION MAGNETIC CIRCUIT B By virtue of its inherently low intercontact capacitance and contact circuit losses, the 421 relay has proven to be an excellent ultraminiature RF switch for frequency ranges well into the UHF spectrum. A typical RF application for this TO-5 relay is in handheld 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 transmit-receive switching (see Figure 1). The Series 421 magnetic-latching relays are ideally suited for applications where coil power dissipation must be minimized. The relays can be operated with a short duration pulse. After the contacts have transferred, no external holding power is required. The magnetic latching feature of the Series 421 provides a “memory” capability, since the relays will not reset upon removal of coil power. MAGNETIC CIRCUIT A SOFT IRON CORE A Energizing Coil B produces a magnetic field COIL A COIL B opposing the holding flux of the permanent magnet SOFT IRON in Circuit B. As this net holding force decreases, the SOFT IRON CORE A CORE B attractive force in the air gap of Circuit A, which also AIR GAP SOFT IRON results from the flux of the permanent magnet, ARMATURE MOVING CONTACT becomes great enough to break the armature free of Core B, and snap it into a closed position against Core A. The armature then remains in this position STATIONARY CONTACT upon removal of power from Coil B, but will snap back into position B upon energizing Coil A. Since operation 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. 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 rated 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 magnetic neutral position. 421 Page 1 ENVIRONMENTAL AND PHYSICAL SPECIFICATIONS Temperature (Ambient) –65°C to +125°C Vibration (General Note 1) 30 g’s to 3000 Hz Shock (General Note 1) 100 g’s, 6 msec, half-sine Acceleration 50 g’s Enclosure Hermetically sealed Weight 0.089 oz. (2.52g) max. SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE www.teledynerelays.com ©2005 TELEDYNE RELAYS 421/1205/Q1 SERIES 421 GENERAL ELECTRICAL SPECIFICATIONS (–65°C to +125°C unless otherwise noted) (Notes 2 & 3) Contact Arrangement Rated Duty Contact Resistance 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) Contact Load Ratings (DC) (See Fig. 2 for other DC resistive voltage/current ratings) Resistive: Inductive: Lamp: Low Level: 0.5 Amp/28Vdc 200 mA/28Vdc (320 mH) 100 mA/28Vdc 10 to 50 µA/10 to 50mV Resistive: 250 mA/115Vac, 60 and 400 Hz (Case not grounded) 100 mA/115Vac, 60 and 400 Hz (Case grounded) 10,000,000 cycles (typical) at low level 100,000 cycles min. at all other loads specified above 1A/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 width @ rated voltage 0.4 pf typical 10,000 megohms min. between mutually isolated terminals Atmospheric pressure: 500 Vrms/60Hz 70,000 ft.: 125 Vrms/60Hz 421D/421DD 1.0 max 421D/421DD 100 min. Contact Load Ratings (AC) Contact Life Ratings Contact Overload Rating Contact Carry Rating Coil Operating Power Operate Time Contact Bounce Minimum Operate Pulse Intercontact Capacitance Insulation Resistance Dielectric Strength Negative Coil Transient (Vdc) Diode P.I.V. (Vdc) DETAILED ELECTRICAL SPECIFICATIONS (–65°C to +125°C unless otherwise noted) (Note 3) BASE PART NUMBERS (See Note 8 for full P/N example) 421-5 421D-5 421DD-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 5.0 6.0 61 48 78.0 111.8 3.5 3.7 4.5 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 Nom. Max. 421/421D 421DD (Note 4) Min. Max. 421 421D 421DD Coil Voltage (Vdc) Coil Resistance (Ohms ±10% @25°C) Coil Current (mAdc @25°C) (421DD Series only) Set & Reset Voltage (Vdc, Max.) PERFORMANCE CURVES (NOTE 2) TYPICAL RF PERFORMANCE TYPICAL DC CONTACT RATING (RESISTIVE) 0 .1 INSE RTIO N .3 LOSS 10 1.92 20 1.22 R) S (VSW N LOS R RETU 30 1.07 40 O SS C 50 CRO ION A 1.02 TS NTAC 1.01 AT ISOL 60 1.00 70 VSWR dB .4 LOAD VOLTAGE (VDC) 300 .2 250 200 150 100 50 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 ©2005 TELEDYNE RELAYS SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE www.teledynerelays.com 0.7 0.8 0.9 1.0 421 Page 2 421/1205/Q1 SERIES 421 SCHEMATIC DIAGRAMS OUTLINE DIMENSIONS CASE DETAIL TERMINAL LOCATIONS AND PIN NUMBERING (REF. ONLY) (Viewed from Terminals) .370 (9.40) DIA. MAX. COIL B .031 (.79) ±.003 (0.08) .335 (8.51) DIA. MAX. 36° ±3° TYP. .280 (7.11) MAX. WIRE LEAD: .75 (19.05) MIN. PIN: .187 (4.75) ±.010 (.25) (See Note 6) +.002 (.05) .017 (.43) –.001 (.03) DIA. COIL A 9 .035 (.89) ±.010 (0.25) 1 421 2 8 7 .200 (5.08) ±.010 (.25) DIA. 6 4 COIL B DIMENSIONS ARE SHOWN IN INCHES (MILLIMETERS) COIL A 421D GENERAL NOTES 1. Relay contacts will exhibit no chatter in excess of 10 µsec or transfer in excess of 1 µsec. 2. “Typical” characteristics are based on available data and are best estimates. No on-going verification tests are performed. 3. Unless otherwise specified, parameters are initial values. 4. For reference only. Coil resistance not directly measurable at relay terminals due to internal series diode, 421DD only. 5. Unless otherwise specified, relays will be supplied with either gold-plated or soldercoated leads. 6. The slash and characters appearing after the slash are not marked on the relay. 7. Screened HI-REL versions available. Contact factory. 8. COIL B COIL A 421DD SCHEMATICS ARE VIEWED FROM TERMINALS COIL A LAST ENERGIZED Teledyne Part Numbering System for T2R® Established Reliability Relay ER 421 X M3 - 26 A / S Q Established Reliability Designator Q= Solder Coated Leads G= Gold Plated Leads (Notes 5 and 6) Relay Series Optional Ground Pin (See Appendix) S= 0.187" leads (Note 6) Screening and Reliability Level Pad Option (See Appendix) Coil Voltage Teledyne Part Numbering System for Military Qualified (JAN) Relays J 421 X M - 26 P L Military (JAN) Designator Screening and Reliability Level Relay Series Optional Ground Pin (See Appendix) Terminal Variant P = 0.187" Coil Voltage Pad Option (See Appendix) JAN part number example is for reference only. Actual part number may not exist. 421 Page 3 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE www.teledynerelays.com ©2005 TELEDYNE RELAYS 421/1205/Q1 Appendix A: Spacer Pads Pad designation and bottom view dimensions Height Ø.150 [3.81] (REF) Dim H MAX “M4” Pad for TO-5 Dim H MAX “M4” Pad for TO-5 Dim H MAX “M4” Pad for Centigrid® .156 [3.96] (REF) Dim H MAX .256 [6.5] (REF) “M9” Pad for Centigrid® For use with the following: ER411T ER412, ER412D, ER412DD 712, 712D, 712TN, RF300, RF310, RF320 ER420, ER422D, ER420DD, 421, ER421D, ER421DD, ER422, ER422D, ER422DD, 722, 722D, RF341 ER431T, ER432T, ER432, ER432D, ER432DD 732, 732D, 732TN, RF303, RF313, RF323 .295 (7.49) .300 (7.62) .305 (7.75) .400 (10.16) .410 (10.41) RF312 .350 (8.89) ER411, ER411D, ER411DD .295 (7.49) ER431, ER431D, ER431DD .400 (10.16) RF311 .300 (7.62) RF331 .410 (10.41) 172, 172D .305 (7.75) ER114, ER114D, ER114DD, J114, J114D, J114DD .300 (7.62) ER134, ER134D, ER134DD, J134, J134D, J134DD .400 (10.16) RF100 .315 (8.00) RF103 .420 (10.67) 122C, A152 .320 (8.13) ER116C, J116C .300 (7.62) ER136C, J136C .400 (10.16) RF180 .325 (8.25) A150 .305 (7.75) Notes: 1. Spacer pad material: Polyester film. 2. To specify an “M4” or “M9” spacer pad, refer to the mounting variants portion of the part numbering example in the applicable datasheet. 3. Dimensions are in inches (mm). 4. Unless otherwise specified, tolerance is ± .010 (.25). 5. Add 10 mΩ to the contact resistance show in the datasheet. 6. Add 0.01 oz. (0.25 g) to the weight of the relay assembly shown in the datasheet. © 2008 Teledyne Relays Dim. H Max. SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE Appendix A: Spreader Pads Pad designation and bottom view dimensions Height For use with the following: .370 [9.4] MAX SQ .100 [2.54] Dim H MAX .150 [3.81] .014 [0.36] (REF) .300 [7.62] .100 [2.54] .370 [9.4] MIN .200 [5.08] “M” Pad 5/ 6/ .390 [9.91] SQ .100 [2.54] .100 [2.54] .150 [3.81] .300 [7.62] .150 [3.81] ER411T, J411T, ER412, ER412D ER412DD, J412, J412D, J412DD ER412T, J412T 712, 712D, 712TN ER431T, J431T, ER432, ER432D ER432DD, J432, J432D, J432DD ER432T, J432T 732, 732D, 732TN .130 [3.3] .300 [7.62] .370 [9.4] MAX SQ .100 [2.54] Dim H MAX .150 [3.81] .014 [0.36] (REF) .300 [7.62] .100 [2.54] .200 [5.08] .370 [9.4] MIN “M” Pad 5/ 6/ 9/ .393 (9.99) .493 (12.52) .503 (12.78) .398 (10.11) ER411T ER412, ER412D, ER412DD J412, J412D, J412DD .441 (11.20) 732, 732D “M” Pad 7/ 8/ .388 (9.86) ER420, J420, ER420D, J420D ER420DD, J420DD, ER421, J421 ER421D, J421D, ER421DD J422D, ER422DD, J422DD, 722 712, 712D ER421, ER421D, ER421DD 722, 732D ER431T ER432, ER432D, ER432DD Dim H MAX Dim. H Max. ER411, ER411D, ER411DD ER411TX ER412X, ER412DX, ER412DDX ER412TX 712X, 712DX, 712TNX ER420X, ER420DX, ER420DDX ER421X, ER421DX, ER421DDX ER422X, ER422DX ER422DDX, 722X, 722DDX ER431, ER431D, ER431DD ER431TX ER432X, ER432DX, ER432DDX ER432TX 732X, 732DX, 732TNX .451 (11.46) .451 (11.46) .546 (13.87) .556 (14.12) .388 (9.86) .393 (9.99) .398 (10.11) .493 (12.52) .503 (12.78) Notes: 1. Spreader pad material: Diallyl Phthalate. 2. To specify an “M”, “M2” or “M3” spreader pad, refer to the mounting variants portion of the part number example in the applicable datasheet. 3. Dimensions are in inches (mm). 4. Unless otherwise specified, tolerance is ± .010” (0.25). 5/. Add 25 mΩ to the contact resistance shown in the datasheet. 6/. Add .01 oz. (0.25 g) to the weight of the relay assembly shown in the datasheet. 7/. Add 50 mΩ to the contact resistance shown in the datasheet. 8/. Add 0.025 oz (0.71 g) to the weight of the relay assembly shown in the datasheet. 9/. M3 pad to be used only when the relay has a center pin (e.g. ER411M3-12A, 722XM3-26.) (800) 284-7007 • www.teledynerelays.com ♦ +44 (0) 1236 453124 • www.teledyne-europe.com © 2008 Teledyne Relays Appendix A: Ground Pin Positions Ø.200 [Ø5.08] 36°±3° "Z" POSITION "X" POSITION "Y" POSITION "Z" Ø.200 [Ø5.08] "Y" 45°±3° TO-5 Relays: ER411T, ER412, ER412T, ER420, ER421, ER422, ER431T, ER432, ER432T, 712, 712TN, 400H, 400K, 400V, RF300, RF303, RF341, RF312, RF310, RF313, RF320, RF323 "Y" POSITION POSITION TO-5 Relays: ER411, ER431, RF311, RF331 POSITION .100 [2.54] "W" "Z" .100 [2.54] .050 [1.27] "X" .100 [2.54] POSITION POSITION "Z" POSITION POSITION .100 [2.54] POSITION "U" POSITION (ER116C and ER136C only) Centigrid® Relays: RF180, ER116C, 122C, ER136C .100 [2.54] Centigrid® Relays: RF100, RF103, ER114, ER134, 172 Indicates ground pin position Indicates glass insulated lead position Indicates ground pin or lead position depending on relay type © 2008 Teledyne Relays "Y" .100 [2.54] NOTES 1. Terminal views shown 2. Dimensions are in inches (mm) 3. Tolerances: ± .010 (±.25) unless otherwise specified 4. Ground pin positions are within .015 (0.38) dia. of true position 5. Ground pin head dia., 0.035 (0.89) ref: height 0.010 (0.25) ref. 6. Lead dia. 0.017 (0.43) nom. SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE