UA79M05CKCS Equivalent & Substitute Parts

Part Overview

The UA79M05CKCS is a linear voltage regulator IC manufactured by Texas Instruments, designed to provide a fixed negative output of -5V at 500mA. This through-hole TO-220-3 package component is classified as a Power Management (PMIC) device and is currently in Last Time Buy status. Due to its end-of-life designation, identifying equivalent and substitute parts is essential for ongoing design support, production continuity, and long-term component availability.

Key Parameters

Parameter	Value
Manufacturer Part Number	UA79M05CKCS
Manufacturer	Texas Instruments
Output Configuration	Negative
Output Type	Fixed
Voltage - Output (Min/Fixed)	-5V
Current - Output	500mA
Voltage - Input (Max)	-25V
Voltage Dropout (Max)	1.1V @ 350mA
Package / Case	TO-220-3
Mounting Type	Through Hole
Operating Temperature	0°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the UA79M05CKCS is determined by the following critical parameters:

Output voltage specification: -5V fixed output
Output current capability: minimum 500mA
Package compatibility: TO-220-3 through-hole mounting
Input voltage rating: sufficient to handle -25V maximum input
Protection features: over-current, over-temperature, and short-circuit protection
Compliance standards: ROHS3 compliance and EAR99 classification

Substitute parts must maintain electrical equivalence in output voltage and current delivery while supporting the same or superior input voltage ratings and protection mechanisms. Package form factor and mounting type are critical for direct board-level replacement without redesign.

Parameter Comparison

Parameter	UA79M05CKCS	MC7905CTG	MC7905BTG	TPS7A3301RGWR
Manufacturer	Texas Instruments	onsemi	onsemi	Texas Instruments
Output Configuration	Negative	Negative	Negative	Negative
Output Type	Fixed	Fixed	Fixed	Adjustable
Voltage - Output (Min/Fixed)	-5V	-5V	-5V	-1.18V
Current - Output	500mA	1A	1A	1A
Voltage - Input (Max)	-25V	-35V	-35V	-36V
Voltage Dropout (Max)	1.1V @ 350mA	1.3V @ 1A (Typ)	1.3V @ 1A (Typ)	0.8V @ 1A
Package / Case	TO-220-3	TO-220-3	TO-220-3	20-VQFN (5x5)
Mounting Type	Through Hole	Through Hole	Through Hole	Surface Mount
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Product Status	Last Time Buy	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For direct board-level replacement without PCB modification, MC7905CTG and MC7905BTG are the primary equivalents. Both are onsemi products in TO-220-3 through-hole packages with fixed -5V output and 1A current capability, exceeding the UA79M05CKCS specifications. MC7905CTG matches the operating temperature range (0°C ~ 125°C) of the original part, while MC7905BTG extends the lower temperature limit to -40°C. Both are in Active product status with ROHS3 compliance.

TPS7A3301RGWR is a Texas Instruments alternative with superior electrical performance (0.8V dropout, 72dB PSRR at 10kHz, adjustable output) but requires PCB redesign due to its 20-VQFN surface-mount package. This option is suitable only for new designs or significant board revisions. The adjustable output configuration allows -5V fixed operation through external resistor network configuration.

All substitute parts maintain ROHS3 compliance, EAR99 classification, and REACH unaffected status consistent with the original UA79M05CKCS.

Frequently Asked Questions (FAQ)

Q: Can MC7905CTG directly replace UA79M05CKCS without PCB changes?

A: Yes. MC7905CTG is pin-compatible in the TO-220-3 package and provides identical -5V fixed output with superior 1A current rating. No PCB modifications are required.

Q: What is the difference between MC7905CTG and MC7905BTG?

A: Both are functionally equivalent -5V 1A regulators in TO-220-3 packages. MC7905BTG extends the operating temperature range to -40°C ~ 125°C, compared to MC7905CTG at 0°C ~ 125°C. Select MC7905BTG for applications requiring sub-zero operation.

Q: Why is TPS7A3301RGWR listed as a substitute if it requires redesign?

A: TPS7A3301RGWR is included as a manufacturer-recommended alternative for new designs or board revisions. Its surface-mount 20-VQFN package and adjustable output topology offer improved performance metrics (lower dropout voltage, higher PSRR) but are incompatible with existing through-hole layouts.

Q: Can TPS7A3301RGWR be configured for -5V output?

A: Yes. TPS7A3301RGWR is adjustable from -1.18V to -33V output. External resistor networks can configure it for fixed -5V operation, though this requires circuit design and PCB layout changes.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. MC7905CTG, MC7905BTG, and TPS7A3301RGWR are all ROHS3 compliant with REACH unaffected status, matching the original UA79M05CKCS compliance profile.

Q: What is the current availability status of these substitutes?

A: MC7905CTG has 4000 pcs in stock, MC7905BTG has 1980 pcs in stock, and TPS7A3301RGWR has 1500 pcs in stock. All are in Active product status with ongoing manufacturing support.

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