S602ESAP Equivalent & Substitute Parts

Part Overview

The S602ESAP is a 600V, 1.5A sensitive gate SCR (silicon controlled rectifier) manufactured by Littelfuse Inc. in TO-92 through-hole packaging. This thyristor is designed for applications requiring controlled rectification and switching at moderate voltage and current levels. The part is currently in active production status with 1,007 units in stock.

Substitute parts are necessary when the original S602ESAP becomes unavailable, when alternative packaging formats are required, or when design flexibility allows for functionally equivalent components that meet the same electrical specifications and operating parameters.

Key Parameters

Parameter	S602ESAP Value
Voltage - Off State	600 V
Voltage - Gate Trigger (Vgt) (Max)	800 mV
Current - Gate Trigger (Igt) (Max)	200 µA
Voltage - On State (Vtm) (Max)	1.7 V
Current - On State (It (RMS)) (Max)	1.5 A
Current - Hold (Ih) (Max)	5 mA
Operating Temperature Range	-40°C to 125°C
Mounting Type	Through Hole
Package / Case	TO-92-3 (TO-226AA)
SCR Type	Sensitive Gate

Substitute Part Grouping Explanation

Substitution eligibility for the S602ESAP is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - Off State: 600 V
SCR Type: Sensitive Gate
Mounting Type: Through Hole
Package / Case: TO-92-3 (TO-226AA)
Operating Temperature Range: -40°C to 125°C

Allowable Variation Parameters:

Voltage - Gate Trigger (Vgt) (Max): 800 mV (fixed across all substitutes)
Current - Gate Trigger (Igt) (Max): May vary (25 µA to 200 µA acceptable)
Voltage - On State (Vtm) (Max): May vary (1.35 V to 1.95 V acceptable)
Current - On State (It (RMS)) (Max): May vary (800 mA to 1.5 A acceptable)
Current - Non Rep. Surge (Itsm): May vary

The substitute parts listed below meet all mandatory matching parameters and fall within acceptable ranges for allowable variation parameters.

Parameter Comparison

Part Number	Manufacturer	Voltage - Off State	Vgt (Max)	Igt (Max)	Vtm (Max)	It (RMS) (Max)	Ih (Max)	Product Status	Packaging
S602ESAP	Littelfuse Inc.	600 V	800 mV	200 µA	1.7 V	1.5 A	5 mA	Active	Tape & Box
P0111MA 1AA3	STMicroelectronics	600 V	800 mV	25 µA	1.95 V	800 mA	5 mA	Active	Bulk
P0118MA 2AL3	STMicroelectronics	600 V	800 mV	5 µA	1.95 V	800 mA	5 mA	Active	Cut Tape
X00602MA 1AA2	STMicroelectronics	600 V	800 mV	200 µA	1.35 V	800 mA	5 mA	Active	Bulk
X00602MA 2AL2	STMicroelectronics	600 V	800 mV	200 µA	1.35 V	800 mA	5 mA	Obsolete	Cut Tape
X00602MA 5AL2	STMicroelectronics	600 V	800 mV	200 µA	1.35 V	800 mA	5 mA	Active	Cut Tape
X00619MA5AL2	STMicroelectronics	600 V	800 mV	200 µA	1.35 V	800 mA	5 mA	Active	Cut Tape
X0202MA 1BA2	STMicroelectronics	600 V	800 mV	200 µA	1.45 V	1.25 A	5 mA	Active	Bulk
X0202MA 2BL2	STMicroelectronics	600 V	800 mV	200 µA	1.45 V	1.25 A	5 mA	Active	Cut Tape
X0205MA 2BL2	STMicroelectronics	600 V	800 mV	50 µA	1.45 V	1.25 A	5 mA	Active	Cut Tape

Engineering Selection Recommendations

Primary Substitutes (Active Status, Full Compatibility):

X0202MA 1BA2 and X0202MA 2BL2 are the preferred substitutes. Both parts maintain 600V off-state voltage, 800 mV gate trigger voltage, and sensitive gate SCR type. The current rating of 1.25A RMS approaches the S602ESAP specification of 1.5A, with on-state voltage of 1.45V within acceptable range. Both parts are in active production status with ROHS3 compliance and REACH unaffected certification.

Secondary Substitutes (Active Status, Reduced Current Rating):

P0111MA 1AA3, P0118MA 2AL3, X00602MA 1AA2, X00602MA 5AL2, and X00619MA5AL2 are functionally equivalent but with reduced current ratings of 800 mA RMS. These parts are suitable for applications where the full 1.5A current capacity of the S602ESAP is not required. All are in active production status with full compliance certifications.

X0205MA 2BL2 offers 1.25A RMS current rating with lower gate trigger current (50 µA maximum), suitable for applications requiring reduced gate drive requirements.

Not Recommended:

X00602MA 2AL2 is marked as obsolete and should not be selected for new designs despite electrical compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with lower current rating than the S602ESAP?

A: Yes, if your application does not require the full 1.5A RMS current capacity. Parts rated at 800 mA or 1.25A RMS are electrically compatible substitutes. Verify your circuit's actual current requirements before selection.

Q: What is the difference between the various X00602MA part numbers?

A: The X00602MA series differs in packaging format (1AA2 is Bulk, 2AL2 and 5AL2 are Cut Tape) and product status. Electrical specifications are identical across these variants. X00602MA 2AL2 is obsolete; use X00602MA 1AA2 or X00602MA 5AL2 for active sourcing.

Q: Are all substitute parts in the same TO-92-3 package?

A: Yes. All listed substitutes use TO-92-3 (TO-226AA) through-hole packaging with formed leads, maintaining mechanical and electrical compatibility with the S602ESAP footprint.

Q: Do substitute parts have the same compliance certifications?

A: All active substitute parts listed are ROHS3 compliant, REACH unaffected, and carry EAR99 ECCN classification, matching the S602ESAP certifications.

Q: What is the significance of gate trigger current (Igt) variation among substitutes?

A: Gate trigger current ranges from 5 µA to 200 µA across substitutes. Lower Igt values (P0118MA 2AL3 at 5 µA) require less gate drive power, while higher values match the original S602ESAP specification (200 µA). Select based on your gate drive circuit capability.

Q: Can I use P0111MA 1AA3 or P0118MA 2AL3 as direct replacements?

A: These STMicroelectronics parts are electrically compatible but rated at 800 mA RMS versus the S602ESAP's 1.5A RMS. They are suitable substitutes only if your application current does not exceed 800 mA.

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