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421 Page 1 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE ©2005 TELEDYNE RELAYS

www.teledynerelays.com 421/1205/Q1 SERIES 421MAGNETIC-LATCHING ESTABLISHED RELIABILITY TO-5 RELAYS SPDT

DESCRIPTION

The magnetic-latching TO-5 rela y, originally conceiv ed 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 mak e the 421 rela y one of the most v ersatile ultraminiature relays available. The f ollowing unique constr uction f eatures and man ufacturing 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. The Series 421D and 421DD utilize discrete silicon diodes for coil suppression and polarity reversal protection. By virtue of its inherently lo w 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 Ser ies 421 magnetic-latching rela ys 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. PRINCIPLE OF OPERATION Energizing Coil B produces a magnetic field opposing the holding flux of the permanent magnet in Circuit B. As this net holding force decreases, the attractive force in the air gap of Circuit A, which also results from the flux of the permanent magnet, 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 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 necessar y to apply the correct polar ity to the rela y coils as indicated on the rela y schematic. When latching rela ys are installed in equipment, the latch and reset coils should not be pulsed sim ultaneously. 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. COIL A SOFT IRON CORE B SOFT IRON CORE A MAGNETIC CIRCUIT A MAGNETIC CIRCUIT B PERMANENT MAGNET COIL B STATIONARY CONTACT AIR GAP MOVING CONTACT SOFT IRON ARMATURE SOFT IRON CORE A 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 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.

421 Page 3 SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE ©2005 TELEDYNE RELAYS

www.teledynerelays.com 421/1205/Q1 6 4 DIMENSIONS ARE SHOWN IN INCHES (MILLIMETERS) .370 (9.40) DIA. MAX. .335 (8.51) DIA. MAX. .280 (7.11) MAX. +.002 (.05) WIRE LEAD: .75 (19.05) MIN. (See Note 6) TERMINAL LOCATIONS AND PIN NUMBERING (REF. ONLY) (Viewed from Terminals) .035 (.89) ±.010 (0.25) .031 (.79) ±.003 (0.08) 36° ±3° TYP. .200 (5.08) ±.010 (.25) DIA. CASE DETAIL OUTLINE DIMENSIONS 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 solder- coated leads. 6. The slash and characters appearing after the slash are not marked on the relay. 7. Screened HI-REL versions available. Contact factory. COIL A COIL B 421 COIL A COIL B 421D COIL A COIL B 421DD SCHEMATICS ARE VIEWED FROM TERMINALS COIL A LAST ENERGIZED SCHEMATIC DIAGRAMS Teledyne Part Numbering System for T2R® Established Reliability Relay ER 421 X M3 - 26 A / S Q Established Reliability Designator Pad Option (See Appendix) Relay Series Optional Ground Pin (See Appendix) Q= Solder Coated Leads G= Gold Plated Leads (Notes 5 and 6) S= 0.187" leads (Note 6) Coil Voltage Screening and Reliability Level Teledyne Part Numbering System for Military Qualified (JAN) Relays JAN part number example is for reference only. Actual part number may not exist. J 421 X M - 26 P L Military(JAN) Designator Pad Option (See Appendix) Relay Series Optional Ground Pin (See Appendix) Terminal Variant P=0.187" Coil Voltage Screening and Reliability Level SERIES 421

bottom view dimensions Height For use with the following: Dim. H Max. “M4” Pad for TO-5 ER411T ER412, ER412D, ER412DD .295 (7.49) 712, 712D, 712TN, RF300, RF310, RF320 .300 (7.62) ER420, ER422D, ER420DD, 421, ER421D, ER421DD, ER422, ER422D, ER422DD, 722, 722D, RF341 .305 (7.75) ER431T, ER432T, ER432, ER432D, ER432DD .400 (10.16) 732, 732D, 732TN, RF303, RF313, RF323 .410 (10.41) RF312 .350 (8.89) “M4” Pad for TO-5 ER411, ER411D, ER411DD .295 (7.49) ER431, ER431D, ER431DD .400 (10.16) RF311 .300 (7.62) RF331 .410 (10.41) “M4” Pad for Centigrid® 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) “M9” Pad for Centigrid® 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 fi lm. 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 specifi ed, tolerance is ± .010 (.25). 5. Add 10 mΩ to the contact resistance show in the datasheet. Ø.150 [3.81] (REF) Dim H MAX Dim H MAX Dim H MAX .156 [3.96] (REF) .256 [6.5] (REF) Dim H MAX Appendix A: Spacer Pads © 2008 Teledyne Relays SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE

bottom view dimensions Height For use with the following: Dim. H Max.“M” Pad 5/ 6/ ER411T, J411T, ER412, ER412D ER412DD, J412, J412D, J412DD ER412T, J412T .388 (9.86) 712, 712D, 712TN .393 (9.99) ER431T, J431T, ER432, ER432D ER432DD, J432, J432D, J432DD ER432T, J432T .493 (12.52) 732, 732D, 732TN .503 (12.78) ER420, J420, ER420D, J420D ER420DD, J420DD, ER421, J421 ER421D, J421D, ER421DD J422D, ER422DD, J422DD, 722 .398 (10.11) “M” Pad 7/ 8/ ER411T ER412, ER412D, ER412DD J412, J412D, J412DD .441 (11.20) 712, 712D .451 (11.46) ER421, ER421D, ER421DD 722, 732D .451 (11.46) ER431T ER432, ER432D, ER432DD .546 (13.87) 732, 732D .556 (14.12) “M” Pad 5/ 6/ 9/ ER411, ER411D, ER411DD ER411TX ER412X, ER412DX, ER412DDX ER412TX .388 (9.86) 712X, 712DX, 712TNX .393 (9.99) ER420X, ER420DX, ER420DDX ER421X, ER421DX, ER421DDX ER422X, ER422DX ER422DDX, 722X, 722DDX .398 (10.11) ER431, ER431D, ER431DD ER431TX ER432X, ER432DX, ER432DDX ER432TX .493 (12.52) 732X, 732DX, 732TNX .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 specifi ed, tolerance is ± .010” (0.25). 5/. Add 25 mΩ to the contact resistance 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.) .370 [9.4] MAX SQ .150 [3.81] .100 [2.54] .200 [5.08] .300 [7.62] .100 [2.54] Dim H MAX .370 [9.4] MIN .014 [0.36] (REF) .390 [9.91] SQ .300 [7.62] .100 [2.54] .300 [7.62] .100 [2.54] .150 [3.81] .150 [3.81] .130 [3.3] Dim H MAX .370 [9.4] MAX SQ .150 [3.81] .100 [2.54] .200 [5.08] .300 [7.62] .100 [2.54] Dim H MAX .370 [9.4] MIN .014 [0.36] (REF) Appendix A: Spreader Pads (800) 284-7007 • www.teledynerelays.com ♦ +44 (0) 1236 453124 • www.teledyne-europe.com © 2008 Teledyne Relays

.100 [2.54] .100 [2.54] .100 [2.54] "Y" POSITION "Z" POSITION .100 [2.54] .100 [2.54] .100 [2.54] "W" POSITION "U" POSITION (ER116C and ER136C only) "X" POSITION "Z" POSITION "Y" POSITION .050 [1.27] 36°±3° Ø.200 [Ø5.08] "Z" POSITION "Y" POSITION "X" POSITION 45°±3° "Z" POSITION "Y" POSITION Ø.200 [Ø5.08] Centigrid® Relays: RF100, RF103, ER114, ER134, 172 Centigrid® Relays: RF180, ER116C, 122C, ER136C 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 TO-5 Relays: ER411, ER431, RF311, RF331 NOTES 1. Terminal views shown 2. Dimensions are in inches (mm) 3. Tolerances: ± .010 (±.25) unless otherwise specifi ed 4. Ground pin positions are within .015 (0.38) dia. of true position Indicates ground pin position Indicates glass insulated lead position Indicates ground pin or lead position depending on relay type Appendix A: Ground Pin Positions © 2008 Teledyne Relays SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE