S6X8ESAP SCR 600V 800mA TO-92 Equivalent & Substitute Parts

Part Overview

The S6X8ESAP is a sensitive gate silicon controlled rectifier (SCR) manufactured by Littelfuse Inc., rated for 600V off-state voltage and 800mA RMS on-state current in a through-hole TO-92 package. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative packaging or sourcing is required, or when design flexibility permits selection from qualified alternatives meeting the same electrical and mechanical specifications.

Key Parameters

Parameter	Value	Unit
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	800	mA
Current - Hold (Ih) Max	5	mA
Operating Temperature Range	-40 to 125	°C
Mounting Type	Through Hole	—
Package / Case	TO-226-3, TO-92-3 (TO-226AA)	—
SCR Type	Sensitive Gate	—

Substitute Part Grouping Explanation

Substitution eligibility for the S6X8ESAP is determined by the following critical parameters:

Mandatory Matching Criteria:

Off-state voltage: 600V
SCR type: Sensitive Gate
Mounting type: Through Hole
Package family: TO-92-3 (TO-226AA)
Operating temperature range: -40°C to 125°C
RoHS3 compliance status

Allowable Variation Criteria:

Gate trigger voltage (Vgt): Up to 800mV maximum
Gate trigger current (Igt): Up to 200µA maximum
On-state voltage (Vtm): Up to 1.7V maximum
On-state current (It RMS): Equal to or greater than 800mA
Hold current (Ih): Up to 5mA maximum

Substitute parts are grouped into two categories: parametric equivalents (matching all critical parameters within tolerance) and manufacturer-recommended alternatives (meeting functional requirements with potential variations in secondary characteristics).

Parameter Comparison

Part Number	Manufacturer	Voff (V)	Vgt Max (mV)	Igt Max (µA)	Vtm Max (V)	It RMS Max (mA)	Ih Max (mA)	Product Status	Packaging
S6X8ESAP	Littelfuse Inc.	600	800	200	1.7	800	5	Active	Tape & Box
S602ESAP	Littelfuse Inc.	600	800	200	1.7	1500	5	Active	Tape & Box
P0111MA 1AA3	STMicroelectronics	600	800	25	1.95	800	5	Active	Bulk
P0118MA 2AL3	STMicroelectronics	600	800	5	1.95	800	5	Active	Cut Tape
X00602MA 2AL2	STMicroelectronics	600	800	200	1.35	800	5	Obsolete	Cut Tape
X00602MA 5AL2	STMicroelectronics	600	800	200	1.35	800	5	Active	Cut Tape
X00619MA5AL2	STMicroelectronics	600	800	200	1.35	800	5	Active	Cut Tape
X0202MA 1BA2	STMicroelectronics	600	800	200	1.45	1250	5	Active	Bulk
X0202MA 2BL2	STMicroelectronics	600	800	200	1.45	1250	5	Active	Cut Tape
X0205MA 2BL2	STMicroelectronics	600	800	50	1.45	1250	5	Active	Cut Tape

Engineering Selection Recommendations

Primary Equivalent (Littelfuse Manufacturer Family): S602ESAP is a direct parametric equivalent from the same manufacturer with identical gate trigger specifications and operating temperature range. The higher on-state current rating (1.5A vs. 800mA) provides additional current capacity while maintaining all other critical parameters. Product status is Active with full RoHS3 compliance.

STMicroelectronics Alternatives (Active Status): P0118MA 2AL3, X00602MA 5AL2, X00619MA5AL2, X0202MA 1BA2, X0202MA 2BL2, and X0205MA 2BL2 all meet the mandatory matching criteria with 600V off-state voltage, sensitive gate configuration, and TO-92-3 package. All are RoHS3 compliant and Active product status. These parts differ in gate trigger current sensitivity and on-state voltage characteristics but remain within acceptable substitution parameters.

Obsolete Status Parts: X00602MA 2AL2 is classified as Obsolete product status. While electrical parameters match the S6X8ESAP, this part should not be selected for new designs or long-term applications due to discontinued manufacturing status.

Packaging Considerations: Tape & Box and Bulk packaging options are suitable for standard procurement. Cut Tape packaging is appropriate for automated assembly processes. All substitute parts maintain through-hole mounting compatibility with TO-92-3 package footprint.

Frequently Asked Questions (FAQ)

Q: Can S602ESAP replace S6X8ESAP in all applications? A: S602ESAP is a direct parametric equivalent with identical gate trigger voltage (800mV max) and current (200µA max) specifications. The higher on-state current rating (1.5A vs. 800mA) is a superset capability. Substitution is valid where circuit design permits the higher current rating.

Q: What is the difference between STMicroelectronics parts with different suffixes (2AL2, 5AL2, 1BA2, 2BL2)? A: Suffix designations indicate packaging format and manufacturing date codes. Electrical parameters remain consistent within each base part number. 2AL2 and 5AL2 variants of X00602MA are functionally identical; 5AL2 is Active status while 2AL2 is Obsolete. Selection should prioritize Active status parts.

Q: Are all substitute parts RoHS3 compliant? A: All parts listed in this reference are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the original S6X8ESAP specification.

Q: Can parts with higher on-state current ratings (1.25A, 1.5A) be used as drop-in replacements? A: Yes, higher on-state current ratings represent increased current capacity and are functionally compatible. Circuit operation remains unchanged; the component simply has additional current handling capability.

Q: Why is X00602MA 2AL2 listed if it is Obsolete? A: X00602MA 2AL2 is included for reference in legacy system maintenance and repair scenarios. For new designs, Active status alternatives such as X00602MA 5AL2 or X00619MA5AL2 should be selected.

Q: What is the significance of gate trigger current (Igt) variations among substitutes? A: Gate trigger current determines the minimum gate current required to switch the SCR into conduction. Lower Igt values (P0118MA 2AL3 at 5µA, X0205MA 2BL2 at 50µA) indicate higher gate sensitivity. All listed values remain within the 200µA maximum specification, ensuring circuit compatibility.

Q: Are Cut Tape and Bulk packaging interchangeable? A: Cut Tape and Bulk packaging formats differ in presentation and handling but contain identical components. Selection depends on assembly process requirements. Bulk packaging suits manual assembly; Cut Tape suits automated pick-and-place systems.

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