FAQ
Frequently Asked Questions
Modec Instruments Ltd.
Send this page to a friend
Tell someone about this
  Q. How do I identify diode ratings from their markings?

A.  Diodes come in a variety of shapes and sizes. Some are silicon, others germanium based. Some are suited to power applications, others to small signal work, while some emit light. Most conduct in only one direction within their working range, but zeners work in reverse above a precise voltage. Following enquiries from visitors it was decided to publish this information as a referance source. We hope you find it useful in identifying and using your older components.

Diode Identichart

Originally published around 1981 in Practical Electronics, this chart shows similar type numbers, voltage and amperage ratings.
Go here for TRANSISTORS CAPACITORS RESISTORS

Diode type listings by reverse voltage.
V- peak reverse voltage
mA- mean forward current in milliamps or amps (A)
VmATYPEVmATYPEVmATYPEVmATYPE
6100BA10455301N19220050 BA198500501N884
6100BA1175550AA13420050 1N8815001001N873
830AAZ1555300BAX78200100 ITT20025001001N363
1020AA1306025AA113200100 1N8705001501N862
1025BA18060301N90200150 1N8595002001N851
1075BA21660301N95200200 1N848500200BAY14
10100BA31660301N96200200 BA1905002501N1104
10100BA16660301N117200200 1S9235002501N1491
10200BA22060401N69200200 1S1325003001N444
1515AA11060501N35200250 1N5385003001N535
1520OA16060501N34A200250 1N14885005001N1486
1520AA13860501N34200300 1N14415002A1N5175
1530AA1126090BA100200300 1N5315002.4A1N5405
1530AA1126090BA100200300 1N5315002.4A1N5405
1570BA16460100BA127200300 1N60250012A1N1205
1580BA17060300BAV10200500 1N3228600501N885
15100BAY31651ABAV44200750 1N32396001001N874
15250BAY1770301N191200750 1N3193600100BAY92
2010BA20970401N52200750 1N20696001501N863
2010BA21070401N48200750 1S1016002001N852
2020OA17970150BAW21200750 1N37556002001S136
2030BA2147555AAZ152001A 1N32486002501N1492
2030AA11675751N9162001A 1N32526002501N1105
2050BA167751001N41482001A 1N37576003001N535
20100BA213751001N44482001A 1N40036003001N445
20100BA243751001N44492001.6A 1N1230600400BY207
20100BA24475150BA2022002.4A 1N5402600400BA158
20115BAY9375300BAW7620012A 1N12026005001N3230
20200AA13980301N19820035A 1N11866007501N3241
2250OA7080351N67250100 ITT20036007501N3195
2510BA13080120DK14250200 BAV216007501N2071
2520AA13180150OA182250250 BA1986007501N3255
2530AA121905AA144250160A 1N32646007501N3279
2530BA1749050AA11830010 BA1456001ABY143
2540AA1149050AA11730050 1N8826001ABYX36-600
25110OA1090115BAW47300100 BA1056001A1N4005
25110OA4790350BAX81300100 1N8716002.4A1N5406
25115BAY6090350BAV12300150 1N860650200BAY15
25115BAX20100301N70300150 BA1736501ABY126
3010AA111100301N127300200 1N8496504ABY190
3010AA140100401N58300250 BAY46750600BY102
3010AA142100401N63300250 BAY88800501N887
3010OA172100401N75300250 1N53980050BA132
3020OA172100501N38300250 1N11028001501N865
3030OA90100501N880300300 1N4428002001N854
3035OA7210050AA132300300 1N603800200BAY16
3035AA11910050BA196300400 BA1488002301N1108
3035AA1151001001N3603001A BYX36-3008002501N560
3050BA1381001001N8693001.6A 1N12318004001N562
3050BA139100100ITT20013002A 1N51738005001N3231
3050BA140100115BAX223002.4A 1N5403800500BY104
3050BA143100115OA530012A 1N1203800500OA211
3050BAX251001501N85830035A 1N1187800750BY100
30801N273100150BA20335010 BA1458007501N3196
30801N2791001501N3754350100 1N3628007501N3256
30200BA317100200BA118350250 BAY218007501N3280
3535OA1741002001S131350400 BA1488001A1N4006
35401N54100225BAY73350400 BY2068001.4ABY178
35115BAY711002501N102940050 1N8838002.4A1N5407
35150OA1281002501N1100400100 1N8728501001N364
35200BAY741002501N537400150 1N8618501ABY133
35300BAW75100250BAY87400150 1N37568504ABY189
40201N511003001N530400200 1N850900501N888
40301N1281003001N440400200 1S134900651N1260
40401N81100375BAY72400250 1N5409001001N877
40501N9171007501N3227400250 1N14909001501N866
4075BA2271007501S100400250 1N11039002001N855
4075BA2281001A1N4002400300 1N44390035A1N3767
40100BAV391001A1N3247400300 1N533100050BA23
40225BAY411001ABY135400400 1S1131000501N889
4535OA791002A1N5172400400 BA15710001001N878
45501N601002.4A1N5401400450 BY12010001001N365
5030BA15410010A1S420400500 BY11610001251N600
5040AAZ1710012A1N1200400500 BY11510001501N867
5050AA12010035A1N1184400500 OA1201000200BA133F
50501N87915050BA197400500 1N322910002001N856
50901SJ50150100BA155400750 1N207010002501N561
50901SJ150150100BA137400750 1N31941000400BA159
501001N8681502001S922400750 1N324010005001N3232
50100BA119150200BA189400750 1N325410005001N3752
50100BA1201502001S121400750 1N327810001ABA142
50100BA128150200BAX164001A 1N324910001A1N4007
50100BA136150200ITT9224001A 1N375810001A1N3252
50100BA175150250BAY454001A 1N400410002.4A1N5408
50100BA3181502501N10304001.4A BY177100035A1N3768
50115BAX211503001N6014001.6A 1N123212501ABY127
50115BAY381506251N20744002A 1N517413001ABY103
50150BA2011501ABYX36-1504002.4A 1N540413001ABY133
50150BAX1315012A1N120140012A 1N120413003ABY255
50200BAY63175100BA19540035A 1N11881600500BYX10
50200BA18718050BA129450400 BA199-45016005001N2490
502001S130180200BAV20450550 BY11416005001N2630
502001S920180250BAY20450500 BY13016005001N2635

Diode type number listings.
V- peak reverse voltage
mA- mean forward current in milliamps or amps (A)
TYPEVmASIMILARTYPEVmASIMILARTYPEVmASIMILARTYPEVmASIMILARTYPEVmASIMILAR
1N346050OA811N8691001001N5371N2103507501N4001AA1212530OA90BAX1350150BAW76
1N34A6050OA811N8702001001N50591N21041007501N4002AA1231830OA90BAX161502001N3070
1N356050OA811N8713001001N50601N21052007501N4003AA1301020OA90BAX2025115BAW76
1N3810050OA811N8724001001N50601N21063007501N4004AA1312520AA119BAX2150115BAX16
1N487040OA811N8735001001N50611N21074007501N4004AA13210050OA91BAX22100115BAX16
1N514020OA811N8746001001N50611N21085007501N4005AA1345550OA91BAX253050BAX13
1N527040OA811N8757001001N50621N211010021N4002AA13525150OA182BAX2630100BAX13
1N543540OA791N8779001001N5611N211120021N4003AA1373020OA90BAY145002001N4005
1N5810040OA811N87810001001N40071N211230021N4004AA1381520OA90BAY156502001N4006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V10
1N91675751N41481N31944007501N5060AAY1525200BAY39BAY4260225BAV10
1N10010020OA951N9173010BA1001N31956007501N5061AAY185030OA154BAY4380225BAV10
1N1027515AA1171N9191501001N30701N31968007501N5062AAY211520AAY27BAY4450250BAY86
1N1032030AAY271N92036500BAX211N32271005001N4002AAY222050AAY27BAY45150250BAY20
1N1042030AAY271N92170500BAX221N32282005001N5060AAY272575BAY38BAY46300250BAY88
1N10710150AAZ181N922100500BAX221N32294005001N5060AAY2810050AAZ15BAY6025115BAW75
1N111755AA1171N923130500FDH4441N32306005001N5061AAY3030110AAZ17BAY61752001N914B
1N112755AA1171N925325BAX211N32318005001N5062AAY3230110AAZ17BAY6350200BAV10
1N113750.5OA951N926325BAX221N323210005001N4007AAY3312100AAZ17BAY7135115BAV10
1N114750.5OA951N9275210BAX221N32381007501N4002AAY4125300AAZ17BAY72100375BAV19
1N116755AA1181N92920201N914B1N32392007501N5059AAY474550AAZ17BAY73100225BAY72
1N1176030OA811N9305020BA1001N32404007501N5060AAY4940150AAZ17BAY7435200BAV10
1N1266030OA811N93110020BA1041N32416007501N5061AAY533650OA90BAY8650250BAY18
1N12710030OA811N93220020BAY461N32471001A1N4002AAY543650OA90BAY87100250BAY19
1N1284030OA791N93310014AAY281N32482001A1N5059AAY553650OA90BAY883002501N4004
1N1917030OA811N9346030BA1041N32494001A1N5060AAZ102530AA116BAY92600100BAX16
1N1925530OA811N94836100BAY411N32506001A1N5061AAZ1230100AAY41BAY9320115BAY38
1N1988030OA811N9495010AAY281N325210001A1N4007BAY9425115BAV10
1N2733080OA811N9932010BAY611N32532007501N5059BA1006090BA127BAY9550200BAV10
1N2793080OA811N994650010-1N32544007501N5060BA1046100OA202BAY9725100BAV10
1N2816075OA811N9951510AAY211N32556007501N5061BA105300100BYX10BAY98150200BAX16
1N3601001001N5371N9962540AAY271N32568007501N5062BA10850100BA100BAY9940100BAV18
1N3612001001N50591N9973510BA1001N32784007501N5060BA1176100BA100
1N3623501001N50601N998150200FDH4441N32796007501N5061BA11950100BA100BY100800750BY127
1N3635001001N50611N999100501N9141N32808007501N5062BA12050100BA100BY101800750BY127
1N3648501001N5611N10083804001N40041N375210005001N4007BA12760100BA100BY102750750BY113
1N36510001001N5611N37541001501N4002BA12850100BA100BY1031301ABY127
1N440100300BAY721N1028502501N48171N37552001501N5059BA12918050BA105BY104800500BY127
1N4412003001N50591N10291002501N48171N37564001501N5060BA1302510BAX13BY112400700BY100
1N4423003001N50601N10301502501N50591N37572001A1N5059BA13280050BYX10BY113800700BY100
1N4434003001N50601N11001002501N48171N37584001A1N5060BA133F1000200BYX10BY114450550BY134
1N4445003001N50611N11012002501N50591N376680035A-BA13650100BA100BY115400500BY134
1N4456003001N50611N11023002501N50601N376790035A-BA137150100BA148BY116400500BY134
1N530100300BAY721N11034002501N50601N3768100035A-BA1383050BA142BY120400450BY134
1N5312003001N50591N11045002501N5061BA1393050BA141BY12260800BY164
1N5334003001N50601N11056002501N50611N4001501ABY122BA1403050BA137BY1266501ABY133
1N5345003001N50611N11088002301N50621N40021001ABY135BA1433050BAX13BY12712501ABY133
1N5356003001N50601N118410035AMR8611N40032001A1N5059BA145350101N4004BY130450500BY113
1N53650250BAY871N118620035AMR8621N40044001A1N5060BA1483504001N4004BY1338501ABY103
1N5371002501N5301N118730035A1N11881N40056001A1N5061BA1545030BA100BY1344501ABY126
1N5382002501N50591N118840035AMR8641N40068001A1N5062BA155150100BA137BY1351001ABY134
1N5393002501N50601N11995012A1N12001N400710001ABY127BA1574004001N4004BY140150002.5ABY176
1N5404002501N50601N120010012AMR11211N4148751001N914BA1586004001N4005BY14210001ABY127
1N5608002501N50621N120115012A1N12021N4448751001N4148BA15910004001N4007BY1436001ABY130
1N56110002501N40071N120220012AMR11221N4449751001N4148BA1641570BA127BY176150002.5ABY140
1N5628004001N40061N120330012A1N12041N51721002ABY192BA16610100BA100BY1774001.4ABY134
1N120440012AMR11241N51733002A1N5625BA1672050BA100BY1788001.4ABY133
1N60010001251N37521N120550012A1N12061N51744002A1N5625BA1701580BA100BY182120004ABY176
1N6011503001N40031N120660012AMR11261N51755002A1N5626BA173300150BA148BY1898504ABYX38-900
1N6022003001N40031N12302001.6A1N47211N54011002.4ABY192BA1742530BA182BY1906504ABYX38-600
1N6033003001N40041N12313001.6A1N54041N54022002.4ADD3026BA17550100BA100BY206350400BY130
1N6044003001N40041N12324001.6A1N47221N54033002.4ADD3026BA17620400BAX16BY207600400BY133
1N6055003001N40051N1260900651N5611N54044002.4ABY191-400BA17835100BA136BYX101600500-
1N6066003001N40051N14865005001N50611N54055002.4ABYX38-900BA1801025BA100BYX36-1501501A1N4003
1N607508001N40011N14871002501N40021N54066002.4ABY190BA1812025BA100BYX36-3003001A1N4004
1N6081008001N40021N14882002501N50591N54078002.4ABY189BA18235100BA136BYX36-6006001A1N4005
1N6091508001N40031N14904002501N50601N540810002.4ABYX39-100BA18750200ITT920
1N6102008001N40031N14915002501N50611S444075BAX13BA188100200ITT921DK1350120OA5
1N6113008001N40041N14926002501N50611S1001007501N4002BA189150200ITT922DK1480120OA182
1N6124008001N40041S1012007501N4003BA190200200ITT923DK15100120OA5
1N6135008001N40051N20692007501N50591S1134004001N4004BA1951751001N3070
1N6146008001N40051N20704007501N40041S120502001N4001BA19610050BA145OA5100115OA130
1N61530075OA901N20716007501N40051S1211502001N5059BA19715050BA145OA1025110HG5808
1N616308AA1161N2072506251N40011S130502001N4817BA1982000501N3070OA4725110HG5808
1N617903AA1171N20731006251N40021S1311002001N4817BA20150150BAW76OA702250OA90
1N618905AA1181N20741506251N50591S1322002001N5059BA20275150BAW76OA723035OA75
1N619303BAY411N20752006251N40031S1344002001N5060BA203100150BAW188OA794535HG1012
1N8482002001N50591N20762506251N40041S1366002001N1105BA20430100BAW76OA8111550OA91
1N8493002001N50601N20773006251N40041S42010010ACL1002BA20920101N914OA8511550OA95
1N8504002001N50601N20784006251N40041S92050200BAY18BA21020101N916OA903030HG1073
1N8515002001N50611N20795006251N40051S921100200BAY19BA21320100BAW76OA9111550HG1005
1N8526002001N50611N208050501N40011S922150200BAY20BA2142030BA100OA9511550HG1005
1N8537002001N50621N20811005001N40021S923200200BAY14BA24320100BA178OA12719150BA100
1N8548002001N50621N20822005001N40031SJ505090BAX13BA24420100BA182OA12835150BA100
1N8559002001N5611N20833005001N4004BA31610100BAW75OA12975150BAX16
1N85610002001N5611N20844005001N4004AA1101515OA90BA31730200BAW75OA130135150BAX16
1N857501501N5371N20855005001N4005AA1113010OA90BA31850100BAW76OA131230150BAX148
1N8581001501N5271N20866005001N4005AA1121530OA90OA15010035OA81
1N8592001501N50591N20885007501N4005AA1136025OA91BAV1060300BAX16OA1593020OA79
1N8603001501N50601N20896007501N4005AA1142540OA91BAV19120200BAX16OA1601520OA90
1N8614001501N50601N2090505001N4001AA1153035OA91BAV201802001N3070OA1723010OA79
1N8625001501N50611N20911005001N4002AA1162030OA90BAV21250200BA148OA1743535OA81
1N8636001501N50611N20922005001N4003AA1179050OA91BAV44651ABYX36/150OA1792020OA90
1N8647001501N50621N20933005001N4004AA1189050OA91BAW2170150BAX16OA18280150BAX16
1N8658001501N50621N20944005001N4004AA1193035OA90BAW7535300BAW76OA2005080HSP1010
1N8669001501N5611N20955005001N4005AA1205020AA129BAW76753001N4151OA20215080HSP1007
1N86710001501N5611N20966005001N4005BAW771201001N3070OA120400500BY100
1N868501001N537OA211800500BY178
We invite your questions and comments along with any updates or corrections to the data above.
Feel free to enter them in the box below.
Vote in our mini poll!

Your feedback is welcome!(faq94)

Your Name
Your Email Address
Subject
Message
Image Verification
Please enter the text from the image:
[ Refresh Image ] [ What's This? ]
   

Your question and response may even be featured on this site
See who visited here
Frequently asked questions
About  |   Products  |   New Items  |   Support  |   Contact  Home