S6X8ESRP SCR 600V 800mA TO-92 Equivalent & Substitute Parts

Part Overview

The S6X8ESRP 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 currently in active product status with 2409 units in stock. Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and thermal operating range to ensure functional interchangeability in circuit applications.

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
Package / Case	TO-226-3, TO-92-3 (TO-226AA)	—
Mounting Type	Through Hole	—
SCR Type	Sensitive Gate	—

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following criteria:

Primary Matching Parameters:

Off-state voltage: 600V (exact match required)
Gate trigger voltage (Vgt): 800mV maximum (exact match required)
SCR type: Sensitive Gate (exact match required)
Package / Case: TO-226-3 or TO-92-3 (exact match required)
Mounting type: Through Hole (exact match required)
Operating temperature range: -40°C to 125°C (exact match required)

Secondary Compatibility Parameters:

On-state current (It RMS): 800mA or higher acceptable
On-state voltage (Vtm): 1.7V or lower acceptable
Gate trigger current (Igt): 200µA or lower acceptable
Hold current (Ih): 5mA or lower acceptable

Parts are grouped into two categories:

Category 1: Parametric Equivalents — Parts matching all primary parameters with on-state current ratings at or above 800mA RMS.

Category 2: Manufacturer Recommended Substitutes — Parts designated as manufacturer-recommended alternatives that meet primary parameters with minor 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	Package
S6X8ESRP	Littelfuse	600	800	200	1.7	800	5	Active	TO-92-3
S602ESRP	Littelfuse	600	800	200	1.7	1500	5	Active	TO-92-3
P0111MA 1AA3	STMicroelectronics	600	800	25	1.95	800	5	Active	TO-92-3
P0118MA 2AL3	STMicroelectronics	600	800	5	1.95	800	5	Active	TO-92-3
X00602MA 2AL2	STMicroelectronics	600	800	200	1.35	800	5	Obsolete	TO-92-3
X00602MA 5AL2	STMicroelectronics	600	800	200	1.35	800	5	Active	TO-92-3
X00619MA5AL2	STMicroelectronics	600	800	200	1.35	800	5	Active	TO-92-3
X0202MA 1BA2	STMicroelectronics	600	800	200	1.45	1250	5	Active	TO-92-3
X0202MA 2BL2	STMicroelectronics	600	800	200	1.45	1250	5	Active	TO-92-3
X0205MA 2BL2	STMicroelectronics	600	800	50	1.45	1250	5	Active	TO-92-3

Engineering Selection Recommendations

Direct Replacement (Preferred): S602ESRP (Littelfuse) is the primary parametric equivalent. It maintains identical primary electrical characteristics to the S6X8ESRP with higher on-state current rating (1500mA RMS vs. 800mA RMS), providing enhanced current handling capability. Both parts are active products with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Manufacturer-Recommended Alternatives: STMicroelectronics parts P0111MA 1AA3, P0118MA 2AL3, X00602MA 5AL2, X00619MA5AL2, X0202MA 1BA2, X0202MA 2BL2, and X0205MA 2BL2 are all designated as manufacturer-recommended substitutes. All maintain 600V off-state voltage, 800mV gate trigger voltage, TO-92-3 package, and -40°C to 125°C operating range. These parts are active products with ROHS3 compliance.

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

Compliance Status: All recommended active parts carry ROHS3 compliance, REACH Unaffected status, and EAR99 ECCN classification, meeting standard regulatory requirements for component selection.

Frequently Asked Questions (FAQ)

Q: Can S602ESRP replace S6X8ESRP directly? A: Yes. S602ESRP is a parametric equivalent with identical voltage and gate trigger specifications. The higher on-state current rating (1500mA RMS) makes it suitable for applications requiring the S6X8ESRP's 800mA RMS specification.

Q: Are STMicroelectronics parts fully interchangeable with Littelfuse parts? A: STMicroelectronics parts meet all primary electrical and package requirements. Minor variations exist in secondary parameters such as gate trigger current (Igt) and on-state voltage (Vtm), which remain within acceptable ranges for sensitive gate SCR applications. Verify circuit-specific requirements before substitution.

Q: What is the difference between X00602MA 2AL2 and X00602MA 5AL2? A: Both parts are electrically identical with 600V, 800mV gate trigger, and 800mA RMS on-state current. The primary difference is product status: X00602MA 2AL2 is obsolete, while X00602MA 5AL2 is active. Use X00602MA 5AL2 for new designs.

Q: Why do some substitutes have higher on-state current ratings? A: Parts such as S602ESRP (1500mA RMS), X0202MA 1BA2 (1250mA RMS), X0202MA 2BL2 (1250mA RMS), and X0205MA 2BL2 (1250mA RMS) are rated for higher current handling. These remain compatible with circuits designed for 800mA RMS operation, as they can safely handle the lower current demand.

Q: Are all substitute parts available in the same packaging? A: Yes. All listed substitutes use TO-226-3 or TO-92-3 (TO-226AA) package with through-hole mounting, ensuring mechanical and electrical compatibility with S6X8ESRP footprints.

Q: What is the significance of gate trigger current (Igt) variations? A: Gate trigger current determines the minimum gate current required to turn on the SCR. Lower Igt values (such as P0118MA 2AL3 at 5µA or X0205MA 2BL2 at 50µA) indicate more sensitive gate triggering compared to the S6X8ESRP baseline of 200µA. Verify gate drive circuit compatibility before substitution.

Q: Should I use obsolete parts if they are in stock? A: No. Obsolete parts such as X00602MA 2AL2 should not be selected for new designs or long-term applications due to supply discontinuation risk. Use active product alternatives instead.

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