S-8340C25AFT-T2-U Equivalent & Substitute Parts

Part Overview

The S-8340C25AFT-T2-U is a Boost Regulator Positive Output Step-Up DC-DC Controller IC manufactured by ABLIC Inc. in an 8-TSSOP surface mount package. This component functions as a transistor driver for step-up (boost) topology power management applications with a single positive output phase. The part is classified as obsolete, making identification of equivalent and substitute components essential for design continuity and procurement planning.

Key Parameters

Parameter	Value
Manufacturer	ABLIC Inc.
Category	Power Management (PMIC)
Function	Step-Up (Boost) DC-DC Controller
Output Type	Transistor Driver
Output Configuration	Positive
Number of Outputs	1
Output Phases	1
Voltage Supply Range (Vcc/Vdd)	0.8V ~ 6V
Switching Frequency	300kHz
Maximum Duty Cycle	89%
Synchronous Rectifier	No
Clock Sync	No
Control Features	Current Limit, Enable, Soft Start
Operating Temperature Range	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	8-TSSOP (0.173", 4.40mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution eligibility for the S-8340C25AFT-T2-U is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Manufacturer: ABLIC Inc.
Package / Case: 8-TSSOP (0.173", 4.40mm Width)
Output Type: Transistor Driver
Function: Step-Up (Boost)
Output Configuration: Positive
Number of Outputs: 1
Output Phases: 1
Voltage Supply Range: 0.8V ~ 6V
Maximum Duty Cycle: 89%
Synchronous Rectifier: No
Clock Sync: No
Control Features: Current Limit, Enable, Soft Start
Operating Temperature Range: -40°C ~ 85°C (TA)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)
REACH Status: REACH Unaffected

Variable Parameter (Allows Substitution):

Switching Frequency: 300kHz or 600kHz or 30kHz

All substitute parts listed maintain identical electrical and mechanical specifications except for switching frequency, which varies by part number designation. This frequency variation is the sole differentiator among the S-8340 and S-8341 series controllers.

Parameter Comparison

Part Number	Manufacturer	Switching Frequency	Package	Operating Temperature	Inventory Status	Product Status
S-8340C25AFT-T2-U	ABLIC Inc.	300kHz	8-TSSOP	-40°C ~ 85°C	958 Pcs	Obsolete
S-8340A50AFT-T2-U	ABLIC Inc.	600kHz	8-TSSOP	-40°C ~ 85°C	900 Pcs	Obsolete
S-8340B00AFT-T2-U	ABLIC Inc.	600kHz	8-TSSOP	-40°C ~ 85°C	909 Pcs	Obsolete
S-8340C50AFT-T2-U	ABLIC Inc.	300kHz	8-TSSOP	-40°C ~ 85°C	1085 Pcs	Obsolete
S-8341A50AFT-T2-U	ABLIC Inc.	600kHz	8-TSSOP	-40°C ~ 85°C	828 Pcs	Obsolete
S-8341B00AFT-T2-U	ABLIC Inc.	600kHz	8-TSSOP	-40°C ~ 85°C	5270 Pcs	Obsolete
S-8341C33AFT-T2-U	ABLIC Inc.	30kHz	8-TSSOP	-40°C ~ 85°C	789 Pcs	Obsolete

Engineering Selection Recommendations

All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original S-8340C25AFT-T2-U. Selection among equivalent parts should be based on application-specific switching frequency requirements:

300kHz Switching Frequency (Matches Original):

S-8340C25AFT-T2-U (original part)
S-8340C50AFT-T2-U (direct frequency equivalent)

600kHz Switching Frequency (Higher Frequency Operation):

S-8340A50AFT-T2-U
S-8340B00AFT-T2-U
S-8341A50AFT-T2-U
S-8341B00AFT-T2-U

30kHz Switching Frequency (Lower Frequency Operation):

S-8341C33AFT-T2-U

All parts are classified as obsolete. Inventory availability varies across the substitute options, with S-8341B00AFT-T2-U offering the highest stock level at 5270 units. Component selection should account for design frequency tolerance and available inventory for long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can S-8340C25AFT-T2-U be directly replaced with S-8340C50AFT-T2-U?

A: Yes. Both parts operate at 300kHz switching frequency and share identical electrical and mechanical specifications. The substitution is direct with no design modifications required.

Q: What is the primary difference between S-8340 and S-8341 series parts?

A: The S-8340 and S-8341 series are differentiated by base product number designation. All listed parts maintain identical functional specifications, output configuration, and package format. Substitution between series is permissible based on switching frequency compatibility.

Q: Can I use a 600kHz part (S-8340A50AFT-T2-U) in place of the 300kHz original (S-8340C25AFT-T2-U)?

A: Substitution is possible if the application design accommodates higher switching frequency operation. Higher switching frequency may affect component selection for external inductors and capacitors, filter performance, and EMI characteristics. Design verification is necessary to confirm compatibility.

Q: Are all substitute parts in the same 8-TSSOP package?

A: Yes. All listed substitute parts use the 8-TSSOP (0.173", 4.40mm Width) surface mount package, ensuring PCB layout compatibility without modification.

Q: What is the significance of the MSL rating of 1 (Unlimited)?

A: MSL 1 indicates unlimited shelf life without moisture bake-out requirements. All substitute parts carry this same rating, ensuring consistent handling and storage procedures.

Q: Do all substitute parts maintain the same compliance certifications?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original S-8340C25AFT-T2-U.

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