Isocom Components Manufacturer Skill

Overview

Isocom Components is a manufacturer of optocouplers and solid state relays. Their product lines include proprietary ISP/ISQ/ISD series as well as industry-standard compatible devices.

MPN Structure

Isocom MPNs follow these general patterns:

ISP/ISQ/ISD Series (Isocom Proprietary)

[PREFIX][SERIES][CTR-GRADE][-PACKAGE][X]
   |       |        |          |      |
   |       |        |          |      +-- Optional: X = Lead-free (RoHS)
   |       |        |          +-- Package: -1=DIP-4, -2=DIP-6, -4=DIP-8
   |       |        +-- CTR Grade: A/B/C/D (Current Transfer Ratio)
   |       +-- Series number (e.g., 817, 827, 847)
   +-- Prefix: ISP, ISQ, ISD

Example Decoding

ISP817A-1X
|  |  | | |
|  |  | | +-- X = Lead-free
|  |  | +-- -1 = DIP-4 package
|  |  +-- A = CTR grade (highest CTR)
|  +-- 817 = Series number
+-- ISP = Phototransistor output

ISQ827B
|  |  |
|  |  +-- B = CTR grade (medium-high CTR)
|  +-- 827 = Dual channel series
+-- ISQ = High CTR optocoupler

---

Product Lines

ISP Series - Phototransistor Output

Series	Description	Channels
ISP817	General purpose phototransistor	1
ISP827	Dual channel phototransistor	2
ISP847	Quad channel phototransistor	4

ISQ Series - High CTR

Series	Description	Channels
ISQ817	High CTR optocoupler	1
ISQ827	High CTR dual channel	2

ISD Series - Darlington Output

Series	Description	Output
ISD817	Darlington output	Single
ISD827	Darlington dual	Dual

4N Series - Standard Optocouplers

Part	Description	Isolation
4N25	Phototransistor output	5300V
4N26	Phototransistor output	5300V
4N27	Phototransistor output	5300V
4N28	Phototransistor output	5300V
4N35	Phototransistor, high isolation	7500V
4N36	Phototransistor, high isolation	7500V
4N37	Phototransistor, high isolation	7500V

6N Series - Logic Output

Part	Description	Output
6N135	High speed, TTL compatible	Push-pull
6N136	High speed, TTL compatible	Push-pull
6N137	High speed logic output	Totem pole
6N138	Darlington output	Open collector
6N139	Darlington output	Open collector

MOC Series - Triac/SCR Drivers

Prefix	Description	Driver Type
MOC30xx	Zero-crossing triac	Safe switch-on at zero
MOC31xx	Random phase triac	Switch any phase
MOC32xx	SCR output	Thyristor driver

---

CTR (Current Transfer Ratio) Grades

For ISP/ISQ/ISD series:

Grade	CTR Range	Application
A	80-160%	Highest gain, lowest LED current needed
B	130-260%	High gain
C	200-400%	Medium gain
D	300-600%	Wide range, lower gain

Note: Grade A can typically replace B/C/D in applications. Higher letter = lower minimum CTR.

---

Package Codes

Code	Package	Pins	Notes
-1	DIP-4	4	Standard 4-pin DIP
-2	DIP-6	6	6-pin DIP (dual channel)
-4	DIP-8	8	8-pin DIP (quad channel)
-1S	SMD-4	4	SMD variant
-2S	SMD-6	6	SMD variant
-4S	SMD-8	8	SMD variant
X	Lead-free	-	RoHS compliant suffix

Default Packages by Series

Series	Default Package
4N	DIP-6
6N	DIP-8
MOC	DIP-6
H11	DIP-6
ISP817	DIP-4
ISQ/ISD	DIP-4

---

Compatible/Equivalent Series

Isocom makes drop-in replacements for:

Isocom	Original	Manufacturer
TLP521	TLP521	Toshiba
TLP621	TLP621	Toshiba
PC817	PC817	Sharp
CNY17	CNY17	Vishay
IL300	IL300	Vishay
SFH6xxx	SFH6xxx	OSRAM
H11xx	H11xx	Fairchild

---

Handler Implementation Notes

Pattern Matching

// Isocom-specific series (ISP, ISQ, ISD)
"^IS[PQD][0-9]{3}.*"

// Standard optocoupler series
"^4N[0-9]{2}.*"        // 4N25, 4N35, etc.
"^6N1[0-9]{2}.*"       // 6N135, 6N137, etc.

// MOC triac/SCR drivers
"^MOC3[0-2][0-9]{2}.*" // MOC30xx, MOC31xx, MOC32xx

Series Extraction

// ISP/ISQ/ISD returns the prefix
"ISP817A" -> "ISP"
"ISQ827B" -> "ISQ"
"ISD817-1" -> "ISD"

// 4N returns specific part
"4N25" -> "4N25"
"4N35A" -> "4N35"

// MOC returns prefix group
"MOC3020" -> "MOC30xx"
"MOC3162" -> "MOC31xx"

Package Extraction Logic

// Check hyphen-based suffix first
"ISP817A-1" -> "DIP-4"
"ISP817A-1S" -> "SMD-4"

// Trailing digit for IS* series (no hyphen)
"ISP8171" -> "DIP-4"

// Default by series
"4N25" -> "DIP-6"  // No explicit package
"6N137" -> "DIP-8"
"MOC3020" -> "DIP-6"

Replacement Logic

• Same IS* series with different CTR grades: higher grade (A) can replace lower (B/C/D)
• 4N series within same group (25-28 or 35-37) are often interchangeable
• MOC series must match driver type (30xx, 31xx, 32xx not interchangeable)
• Package must be compatible (DIP cannot replace SMD directly)

---

Related Files

• Handler:

  manufacturers/IsocomHandler.java

• Component types:

  ComponentType.IC

---

Learnings & Edge Cases

• 4N series package detection: Do NOT apply trailing digit package logic to 4N series. "4N25" ends with "5" but that's the part number, not a package code. Always return default DIP-6 for 4N.
• CTR grade position: CTR grade letter comes immediately after the 3-digit series number, before any hyphen or suffix.
• MOC compatibility: MOC30xx (zero-crossing) and MOC31xx (random phase) are NOT interchangeable - they have different triggering behavior.
• 6N series speed: 6N137 is significantly faster than 6N135/6N136. Not always interchangeable in high-speed applications.
• Lead-free suffix: X suffix indicates RoHS compliance. Does not affect electrical compatibility.

<!-- Add new learnings above this line -->