KA3883CDTF Equivalent & Substitute Parts

Part Overview

The KA3883CDTF is a Regulator Positive Output DC-DC Controller IC manufactured by onsemi in 8-SOIC packaging. This device functions as a transistor driver for single-output, positive configuration power management applications with switching frequencies up to 500kHz. The product is classified as obsolete, making identification of functionally equivalent substitute parts essential for design continuity and procurement planning. Active alternatives with matching electrical and mechanical specifications are available from multiple manufacturers including Analog Devices Inc. and Texas Instruments.

Key Parameters

Parameter	KA3883CDTF Value
Manufacturer	onsemi
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Output Type	Transistor Driver
Output Configuration	Positive
Number of Outputs	1
Voltage - Supply (Vcc/Vdd)	7.6V ~ 30V
Frequency - Switching	Up to 500kHz
Duty Cycle (Max)	96%
Synchronous Rectifier	Yes
Operating Temperature	0°C ~ 70°C (TA)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the KA3883CDTF is determined by strict alignment of the following critical parameters:

Primary Matching Criteria:

Package / Case: 8-SOIC (0.154", 3.90mm Width) — mandatory for PCB compatibility
Mounting Type: Surface Mount — required for assembly process compatibility
Output Type: Transistor Driver — functional requirement for controller operation
Output Configuration: Positive — electrical requirement for output polarity
Number of Outputs: 1 — circuit topology requirement
Voltage - Supply (Vcc/Vdd): 7.6V ~ 30V or compatible range — power supply compatibility
Frequency - Switching: Up to 500kHz or higher — operational frequency requirement
Duty Cycle (Max): 96% or higher — operational capability requirement
Operating Temperature: 0°C ~ 70°C or extended range — thermal environment compatibility
RoHS Status: ROHS3 Compliant — regulatory compliance requirement

Substitute parts must satisfy all primary matching criteria. Parts with extended operating temperature ranges, higher switching frequencies, or higher duty cycle capabilities are functionally compatible. Parts with active product status are preferred over obsolete alternatives for long-term availability.

Parameter Comparison

Parameter	KA3883CDTF	UC3843BD1R2G	LT1247CS8#PBF	LT1247CS8#TRPBF	UC1842AMDREP	UC1843AMDREP	UC1844AMDREP	UC1845AMDREP	UCC2800MDREP
Manufacturer	onsemi	onsemi	Analog Devices Inc.	Analog Devices Inc.	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments
Package / Case	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Output Type	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	PWM Controller	PWM Controller	PWM Controller	PWM Controller	PWM Controller
Output Configuration	Positive	Positive, Isolation Capable	Positive	Positive	N/A	N/A	N/A	N/A	N/A
Number of Outputs	1	1	1	1	N/A	N/A	N/A	N/A	N/A
Voltage - Supply (Vcc/Vdd)	7.6V ~ 30V	7.6V ~ 30V	8.4V ~ 25V	8.4V ~ 25V	10V ~ 30V	7.9V ~ 30V	10V ~ 30V	7.9V ~ 30V	6.9V ~ 12V
Frequency - Switching	Up to 500kHz	Up to 500kHz	1MHz	1MHz	N/A	N/A	N/A	N/A	N/A
Duty Cycle (Max)	96%	96%	100%	100%	N/A	N/A	N/A	N/A	N/A
Operating Temperature	0°C ~ 70°C (TA)	0°C ~ 70°C (TA)	0°C ~ 100°C (TJ)	0°C ~ 100°C (TJ)	-55°C ~ 125°C (TA)	-55°C ~ 125°C (TA)	-55°C ~ 125°C (TA)	-55°C ~ 125°C (TA)	-55°C ~ 125°C (TA)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

UC3843BD1R2G (onsemi) and LT1247CS8#PBF / LT1247CS8#TRPBF (Analog Devices Inc.) provide the closest electrical and mechanical alignment to the KA3883CDTF. These parts maintain identical 8-SOIC packaging, surface mount compatibility, and supply voltage range specifications. UC3843BD1R2G matches the 500kHz switching frequency and 96% duty cycle limits exactly. LT1247 variants support higher switching frequencies (1MHz) and 100% duty cycle, providing extended operational capability within the same package footprint. All three alternatives carry active product status and ROHS3 compliance.

Secondary Substitutes (Extended Operating Range):

UC1842AMDREP, UC1843AMDREP, UC1844AMDREP, and UC1845AMDREP (Texas Instruments) offer extended operating temperature ranges (-55°C ~ 125°C) compared to the KA3883CDTF (0°C ~ 70°C). These PWM controller variants maintain 8-SOIC packaging and surface mount compatibility. Supply voltage ranges vary: UC1842AMDREP and UC1844AMDREP specify 10V ~ 30V, while UC1843AMDREP and UC1845AMDREP specify 7.9V ~ 30V. All carry active product status and ROHS3 compliance, suitable for applications requiring wider thermal operating windows.

Limited Compatibility:

UCC2800MDREP (Texas Instruments) maintains 8-SOIC packaging and surface mount compatibility but specifies a restricted supply voltage range of 6.9V ~ 12V, which does not fully overlap the KA3883CDTF requirement of 7.6V ~ 30V. This part is suitable only for applications operating within the 7.6V ~ 12V window. Active product status and ROHS3 compliance are maintained.

Frequently Asked Questions (FAQ)

Q: Why is the KA3883CDTF classified as obsolete?

A: The KA3883CDTF is no longer in active production. Onsemi has transitioned this product line to newer controller architectures. Active alternatives from onsemi, Analog Devices Inc., and Texas Instruments provide equivalent or enhanced functionality in the same 8-SOIC package.

Q: Can I use UC3843BD1R2G as a direct replacement for KA3883CDTF?

A: UC3843BD1R2G is functionally compatible. Both devices share identical 8-SOIC packaging, 7.6V ~ 30V supply voltage range, 500kHz switching frequency, and 96% maximum duty cycle. UC3843BD1R2G is manufactured by onsemi and carries active product status, making it the preferred direct substitute.

Q: What is the difference between LT1247CS8#PBF and LT1247CS8#TRPBF?

A: Both parts are electrically identical. The difference is packaging format: LT1247CS8#PBF is supplied in tube packaging, while LT1247CS8#TRPBF is supplied in tape and reel format. Select based on procurement and assembly requirements.

Q: Can I use a substitute with a higher switching frequency than 500kHz?

A: Yes. LT1247CS8#PBF and LT1247CS8#TRPBF support 1MHz switching frequency, which is higher than the KA3883CDTF specification. Higher switching frequency capability does not prevent substitution; the circuit will operate at the designed frequency regardless of the device's maximum capability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the KA3883CDTF environmental standard.

Q: Which substitute offers the widest operating temperature range?

A: UC1842AMDREP, UC1843AMDREP, UC1844AMDREP, and UC1845AMDREP (Texas Instruments) all support -55°C ~ 125°C operating temperature, compared to the KA3883CDTF range of 0°C ~ 70°C. Select these variants for applications requiring extended thermal operating windows.

Q: Is UCC2800MDREP suitable for all KA3883CDTF applications?

A: UCC2800MDREP is suitable only for applications where the supply voltage remains within 7.6V ~ 12V. The device's maximum supply voltage specification of 12V does not support applications requiring operation above 12V. Verify supply voltage requirements before selection.

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

A: MSL Level 1 indicates unlimited shelf life without moisture baking requirements. All listed parts, including the KA3883CDTF, carry this classification, eliminating moisture sensitivity concerns during storage and handling.

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