421 page 1 specifications are subject to change without notice ?005 teledyne relays www .teledynerela ys.com 421/1205/q1 series 421 magnetic-latching established reliability to-5 relays spdt description the magnetic-latching t o-5 rela y , or iginally 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 ollo wing unique constr uction f eatures and man ufacturing techniques provide excellent resistance to environmental extremes and o v er all high reliability: ? all welded construction. ? unique uni-frame design providing high magnetic efficiency and mechanical rigidity. ? high f orce/mass ratios for resistance to shock and vibration. ? advanced cleaning techniques provide maximum assurance of inter nal 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 polar ity re v ersal protection. by vir tue 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 perf or mance , 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 emory capability, since the relays will not reset upon removal of coil power. principle of opera tion 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 r ated coil v oltage and the pulse width should be a minim um of three times the specified oper ate time of the rela y . if these conditions are not followed, it is possible f or the rela y to be in the magnetic neutr al position. 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 t emperature (ambient) C5 c to +125 vibration (general note 1) 30 gs to 3000 hz shock (general note 1) 100 gs, 6 msec, half-sine acceleration 50 gs enclosure hermetically sealed weight 0.089 oz. (2.52g) max. 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
?005 teledyne relays specifications are subject to change without notice 421 page 2 www .teledynerela ys.com 421/1205/q1 performance curves (note 2) s eries 421 g eneral electrical specifications (C5?to +125? nless otherwise noted) (notes 2 & 3) det ailed electrical specifica tions (C5?to +125? nless otherwise noted) (note 3) contact arrangement 1 form c (spdt) rated duty continuous contact resistance 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: 0.5 amp/28vdc inductive: 200 ma/28vdc (320 mh) lamp: 100 ma/28vdc low level: 10 to 50 ?/10 to 50mv contact load ratings (ac) resistive: 250 ma/115vac, 60 and 400 hz (case not grounded) 100 ma/115vac, 60 and 400 hz (case grounded) contact life ratings 10,000,000 cycles (typical) at low level 100,000 cycles min. at all other loads specified above contact overload rating 1a/28vdc resistive (100 cycles min.) contact carry rating contact factory coil operating power 290 milliwatts typical at nominal rated voltage @ 25 operate time 1.5 msec max. at nominal rated coil voltage contact bounce 1.5 msec max. minim um operate pulse 4.5 msec width @ r ated voltage intercontact capacitance 0.4 pf typical insulation resistance 10,000 megohms min. between mutually isolated terminals dielectric strength atmospheric pressure: 500 vrms/60hz 70,000 ft.: 125 vrms/60hz negative coil transient (vdc) 421d/421dd 1.0 max diode p.i.v. (vdc) 421d/421dd 100 min. 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 coil voltage (vdc) nom. 5.0 6.0 9.0 12.0 18.0 26.5 max. 6.0 8.0 12.0 16.0 24.0 32.0 coil resistance (ohms 10% @25 c) 421/421d 61 120 280 500 1130 2000 421dd (note 4) 48 97 280 500 1130 2000 coil current (madc @25 c) (421dd series only) min. 78.0 45.8 25.7 19.6 13.4 11.2 max. 111.8 63.0 34.9 26.7 18.8 15.2 set & reset voltage (vdc, max.) 421 3.5 4.5 6.8 9.0 13.5 18.0 421d 3.7 4.5 6.8 9.0 13.5 18.0 421dd 4.5 5.5 7.8 10.0 14.5 19.0 0 .1 .2 .3 .4 10 20 30 40 50 60 70 .01 0.5 .1 .5 1.0 frequenc y (ghz) figure 1 typica l rf performance i s o l a t i o n a c r o s s c o n t a c t s 1.92 1.22 1.07 1.02 1.01 1.00 1.00 v s w r 300 250 200 150 100 50 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 load curren t (amps dc) figure 2 typica l dc contact rating (resistive) l o a d v o l t a g e ( v d c ) d b r e t u r n l o s s ( v s w r ) i n s e r t i o n l o s s
421 page 3 specifications are subject to change without notice ?005 teledyne relays www .teledynerela ys.com 421/1205/q1 o utline dimensions general notes 1. relay contacts will exhibit no chatter in excess of 10 sec or transfer in excess of 1 ?ec. 2. ypical 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. 8. schematic diagrams s eries 421 9 8 7 6 4 2 1 dimensions are shown in inches (millimeters) .370 (9.40) dia . max. .335 (8.51) d ia . max. . 280 (7.11) max. + .002 (.05) .017 (.43) C001 (.03) dia. wire lead: .75 (19.05) min. pin : .187 (4.75) .010 (.25) ( see note 6) terminal locations and pin numbering (ref. on ly ) ( view ed from terminals) . 035 (.89) .010 (0.25) .031 (.79) .003 (0.08) 36 3 typ. . 200 (5.08) .010 (.25) dia. case detail teledyne part numbe ring system for t 2 r ? esta blished reliability rel ay er 421 x m3 - 26 a / s q e s t a b l i s h e d r e l i a b i l i t y d e s i g n a t o r pad option (see appendix) rel ay 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 l evel teledyne part numbe ring system for military qualified ( jan) relays j an pa rt number example is for re ference only. actual pa rt number m ay not exist. j 421 x m - 26 p l m i l i t a r y ( j a n ) d e s i g n a t o r pad option (see appendix) rel ay series optional ground pin (see appendix) t erminal va riant p = 0.187" coil voltage screening and reliability l evel coil a c oil b 421 coil a coil b 421d c oil a coil b 421dd schematics are viewed from terminals coil a last energized
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