Agent skill

panjit

Panjit International MPN encoding patterns, suffix decoding, and handler guidance. Use when working with Panjit diodes, transistors, MOSFETs, or PanjitHandler.

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npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/data/panjit

SKILL.md

Panjit International Manufacturer Skill

Overview

Panjit International is a Taiwanese semiconductor manufacturer producing discrete semiconductors including diodes, transistors, and MOSFETs. They are known for industry-standard compatible parts as well as their proprietary PJ MOSFET series.

MPN Structure

Panjit MPNs follow industry-standard patterns with package suffixes:

Standard Diode Pattern

[SERIES][RATING][SUFFIX]
   |       |       |
   |       |       +-- Package code
   |       +-- Voltage/specification
   +-- Series prefix (1N, SS, SK, BAV, etc.)

PJ MOSFET Pattern

PJ[SERIES][SUFFIX]
   |        |
   |        +-- Package code
   +-- 4-digit series number

Example Decoding

1N4007G
|  |  ||
|  |  |+-- G = DO-41 package
|  |  +-- 7 = 1000V rating
|  +-- 400 = Rectifier series
+-- 1N = Standard diode prefix

MMBT3904LT
|   |  | |
|   |  | +-- LT = SOT-23 package
|   |  +-- NPN transistor number
|   +-- 3904 series
+-- MMBT = SMD transistor prefix

PJ2308N
| |  ||
| |  |+-- N = TO-92 package
| |  +-- Series number
| +-- 23 series
+-- PJ = Panjit proprietary MOSFET

Product Lines

Standard Rectifier Diodes (1N4xxx)

Part Voltage Current Package
1N4001 50V 1A DO-41
1N4002 100V 1A DO-41
1N4003 200V 1A DO-41
1N4004 400V 1A DO-41
1N4005 600V 1A DO-41
1N4006 800V 1A DO-41
1N4007 1000V 1A DO-41

Signal Diodes

Part Description Package
1N4148 Small signal, 100V DO-35/SOD-123
1N914 Signal diode (equiv. 1N4148) DO-35

Power Rectifiers (1N5xxx)

Part Voltage Current Package
1N5400 50V 3A DO-201
1N5401 100V 3A DO-201
1N5402 200V 3A DO-201
1N5404 400V 3A DO-201
1N5406 600V 3A DO-201
1N5408 1000V 3A DO-201
1N5817 20V 1A DO-41 (Schottky)
1N5819 40V 1A DO-41 (Schottky)

Fast Recovery Diodes

Series Speed Examples
ES Fast ES1J, ES2J, ES1D
RS Fast RS1M, RS2M, RS1G
US Ultra-fast US1M, US2M
UF Ultra-fast UF4001-UF4007

Schottky Diodes (SS Series)

Part Voltage Current Package
SS12 20V 1A SMA
SS14 40V 1A SMA
SS16 60V 1A SMA
SS24 40V 2A SMA
SS34 40V 3A SMA

Schottky Diodes (SK Series)

Part Voltage Current Package
SK34 40V 3A SMB
SK36 60V 3A SMB
SK52 20V 5A SMB
SK54 40V 5A SMB
SK56 60V 5A SMB

Schottky Barrier (SB Series)

Part Voltage Current Package
SB140 40V 1A DO-41
SB160 60V 1A DO-41
SB360 60V 3A DO-201
SB560 60V 5A DO-201

Schottky Barrier (MBR Series)

Part Current Voltage Package
MBR340 3A 40V DO-201
MBR360 3A 60V DO-201
MBR1045 10A 45V TO-220

Signal Diodes (BAV/BAS/BAT Series)

Series Type Examples
BAV Small signal BAV21, BAV70, BAV99
BAS Switching BAS16, BAS21
BAT Schottky barrier BAT54, BAT54S, BAT54C

Zener Diodes (BZX Series)

Series Package Examples
BZX84 SOT-23 BZX84C5V1, BZX84C3V3
BZX55 DO-35 BZX55C3V3, BZX55C5V1

TVS Diodes

Series Package Examples
SMBJ SMB SMBJ5.0A, SMBJ15A
SMAJ SMA SMAJ5.0A, SMAJ15A

SMD Transistors (MMBT Series)

Part Type Equivalent Package
MMBT2222 NPN 2N2222 SOT-23
MMBT2907 PNP 2N2907 SOT-23
MMBT3904 NPN 2N3904 SOT-23
MMBT3906 PNP 2N3906 SOT-23

MPSA Series Transistors

Part Type Application
MPSA42 NPN High voltage
MPSA92 PNP High voltage
MPSA06 NPN General purpose

2N Series Transistors

Part Type Package
2N2222 NPN TO-92
2N2907 PNP TO-92
2N3904 NPN TO-92
2N3906 PNP TO-92
2N7002 N-Ch MOSFET SOT-23

BC Series Transistors

Part Type Package
BC847 NPN SOT-23
BC857 PNP SOT-23
BC337 NPN TO-92

PN Series Transistors

Part Type Equivalent
PN2222 NPN 2N2222
PN2907 PNP 2N2907

MOSFETs (BSS Series)

Part Type Package
BSS138 N-Channel SOT-23
BSS84 P-Channel SOT-23

MOSFETs (PJ Series - Panjit Proprietary)

Part Type Package
PJ2308 N-Channel Various
PJ3415 N-Channel Various
PJ4435 P-Channel Various

MOSFETs (SI/AO Series)

Part Type Package
SI2301 P-Channel SOT-23
SI2302 N-Channel SOT-23
AO3400 N-Channel SOT-23
AO3401 P-Channel SOT-23

Package Codes

Comprehensive Package Suffix Table

Code Package Notes
G DO-41 Standard axial
GP DO-41 Axial variant
W SOD-123 Small SMD
WS SOD-323 Very small SMD
A SOT-23 SMD transistor
LT SOT-23 SOT-23 variant
WT SOT-23 SOT-23 variant
F SMAF Flat SMA
S SMA Standard SMD
B SMB Medium SMD
C SMC Large SMD
FL SOD-123FL Flat lead
T TO-220 Power through-hole
TP TO-220F Isolated tab
N TO-92 Small through-hole
NL TO-92 TO-92 variant

Default Packages by Series

Series Default Package
MMBT SOT-23
BC SOT-23
2N7002 SOT-23
BSS SOT-23
2N (other) TO-92
ES/RS/US SMA
SS DO-214AC (SMA)
SK SMB
BAV/BAS/BAT SOT-23
1N4xxx DO-41

Handler Implementation Notes

Pattern Matching

java
// Standard rectifiers
"^1N4[0-9]{3}.*"        // 1N4001-1N4007
"^1N5[0-9]{3}.*"        // 1N5xxx series

// Signal diodes
"^1N4148.*"
"^1N914.*"

// Fast recovery
"^ES[1-3][A-Z].*"
"^RS[1-3][A-Z].*"
"^US[1-3][A-Z].*"
"^UF[0-9]{4}.*"

// Schottky
"^SS[1-3][0-9].*"
"^SK[3-5][0-9].*"
"^SB[1-5][0-9]{2}.*"
"^MBR[0-9]{3,4}.*"

// Signal diodes
"^BAV[0-9]{2}.*"
"^BAS[0-9]{2}.*"
"^BAT[0-9]{2}.*"

// Zener
"^BZX[0-9]{2}.*"

// TVS
"^SMB[AJ][0-9].*"
"^SMA[J][0-9].*"

// Transistors (exclude 2N7002)
"^MMBT[0-9]{3,4}.*"
"^MPSA[0-9]{2}.*"
"^2N[0-9]{4}.*"         // But NOT 2N7002
"^BC[0-9]{3}.*"
"^PN[0-9]{4}.*"

// MOSFETs
"^2N7002.*"
"^BSS[0-9]{2,3}.*"
"^PJ[0-9]{4}.*"
"^SI[0-9]{4}.*"
"^AO[0-9]{4}.*"

Series Extraction

java
// Signal diodes (specific before generic)
"1N4148W" -> "1N4148"
"1N914" -> "1N914"

// Rectifiers
"1N4007G" -> "1N4000"
"1N5408" -> "1N5400"
"1N5819" -> "1N5800"  // Schottky series

// Fast recovery
"ES1J" -> "ES"
"RS1M" -> "RS"
"US1M" -> "US"
"UF4007" -> "UF"

// Schottky
"SS14" -> "SS"
"SK34" -> "SK"
"SB160" -> "SB"
"MBR1045" -> "MBR"

// Signal
"BAV99" -> "BAV"
"BAS16" -> "BAS"
"BAT54S" -> "BAT"

// Zener
"BZX84C5V1" -> "BZX"

// TVS
"SMBJ15A" -> "SMBJ"
"SMAJ24CA" -> "SMAJ"

// Transistors
"MMBT3904" -> "MMBT"
"MPSA42" -> "MPSA"
"2N3904" -> "2N"
"BC547B" -> "BC"
"PN2222A" -> "PN"

// MOSFETs
"BSS138" -> "BSS"
"PJ2308" -> "PJ"
"SI2301" -> "SI"
"AO3400" -> "AO"

Replacement Logic

java
// 1N400x: higher voltage can replace lower
"1N4007" can replace "1N4001" through "1N4006"

// 1N540x: higher voltage can replace lower
"1N5408" can replace "1N5400" through "1N5407"

// SS series: higher current can replace lower
"SS34" can replace "SS14" (same voltage, higher current)

// Signal diode equivalents
"1N4148" == "1N914"

// MMBT equivalent to 2N
"MMBT3904" == "2N3904" (different package)

// Transistor base number match
"MMBT2222" base = "2222"
"2N2222" base = "2222"
"PN2222" base = "2222"
// All three are equivalent electrically

Component Types

Pattern ComponentType
1N*, SS*, SK*, SB*, MBR*, BAV*, BAS*, BAT*, BZX*, SMBJ*, SMAJ*, ES*, RS*, US*, UF* DIODE
MMBT* (not 2N7002), MPSA*, 2N* (not 2N7002), BC*, PN* TRANSISTOR
2N7002, BSS*, PJ*, SI*, AO* MOSFET

Related Files

  • Handler: manufacturers/PanjitHandler.java
  • Component types: ComponentType.DIODE, ComponentType.TRANSISTOR, ComponentType.MOSFET

Learnings & Edge Cases

  • 2N7002 is MOSFET: The 2N prefix usually indicates transistors, but 2N7002 is specifically an N-channel MOSFET. Handler explicitly excludes it from TRANSISTOR type.
  • PJ series proprietary: PJ series MOSFETs are Panjit's proprietary line. Package code typically follows 4-digit series number.
  • 1N4148 vs 1N914: These are equivalent signal diodes. Handler returns true for isOfficialReplacement().
  • 1N5817-1N5819 are Schottky: Unlike 1N5400-1N5408 which are standard rectifiers, 1N58xx in this range are Schottky diodes with lower forward voltage.
  • Package suffix order matters: Check longer suffixes (WS, GP, FL, NL, TP, LT, WT) before shorter (W, G, F, N, T, L). Otherwise "WS" matches "S" first.
  • MMBT base extraction: Extract base number for equivalence: MMBT2222A -> "2222", 2N2222A -> "2222". Both are electrically equivalent.
  • SS/SK current encoding: First digit is current (1-5A), second is voltage code. SS14 = 1A/40V.
  • BAT54 variants: BAT54S = series pair, BAT54C = common cathode. Different pinouts, not interchangeable.

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