UA7905CKCS Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The UA7905CKCS is a linear voltage regulator IC from Texas Instruments designed to provide a fixed negative 5V output at 1.5A in a TO-220-3 package. This device is classified as Last Time Buy, indicating limited future availability. Finding equivalent and substitute parts ensures design continuity and supply chain resilience for applications requiring negative voltage regulation in this performance class.

Key Parameters

Parameter	Value
Output Configuration	Negative
Output Type	Fixed
Voltage - Output (Min/Fixed)	-5V
Voltage - Input (Max)	-25V
Current - Output	1.5A
Voltage Dropout (Max)	1.1V @ 1A
Package / Case	TO-220-3
Operating Temperature	0°C ~ 125°C
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the UA7905CKCS is determined by the following critical parameters:

Output Configuration & Voltage: All substitutes must provide negative fixed -5V output
Current Rating: Substitutes must support minimum 1.5A output current
Package & Mounting: All substitutes must use TO-220-3 through-hole package for direct PCB compatibility
Input Voltage Range: Maximum input voltage rating must accommodate -25V minimum
Operating Temperature: Must support 0°C ~ 125°C range
Compliance: RoHS3 compliance required

Substitutes are grouped into two categories: MFR Recommended (direct manufacturer alternatives) and Parametric Equivalent (functionally identical specifications).

Parameter Comparison

Parameter	UA7905CKCS	LM7905CT/NOPB	L7905ACV	MC7905CTG	UA7905CKCSE3
Manufacturer	Texas Instruments	Texas Instruments	STMicroelectronics	onsemi	Texas Instruments
Output Voltage	-5V	-5V	-5V	-5V	-5V
Current - Output	1.5A	1.5A	1.5A	1A	1.5A
Voltage - Input (Max)	-25V	-25V	-35V	-35V	-25V
Voltage Dropout (Max)	1.1V @ 1A	1.1V @ 1A	1.4V @ 1A (Typ)	1.3V @ 1A (Typ)	1.1V @ 1A
PSRR	60dB (120Hz)	66dB (120Hz)	60dB (120Hz)	70dB (120Hz)	60dB (120Hz)
Package / Case	TO-220-3	TO-220-3	TO-220-3	TO-220-3	TO-220-3
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C
Product Status	Last Time Buy	Active	Active	Active	Last Time Buy
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

LM7905CT/NOPB (Texas Instruments) is the primary recommended substitute. It maintains identical electrical specifications to the UA7905CKCS with 1.5A output current and 1.1V dropout voltage. Product status is Active, ensuring long-term availability. This part is the direct functional equivalent from the same manufacturer.

L7905ACV (STMicroelectronics) is a qualified alternative with extended input voltage rating (-35V maximum) and Active product status. The 1.4V typical dropout voltage represents a minor increase from the UA7905CKCS specification. This part is suitable for applications with higher input voltage margins.

MC7905CTG (onsemi) provides an alternative from a different manufacturer with Active status. Output current is rated at 1A, which is below the 1.5A requirement of the UA7905CKCS. This part is suitable only for applications requiring 1A or less output current.

UA7905CKCSE3 (Texas Instruments) is a parametric equivalent with identical specifications to the UA7905CKCS. Product status is Last Time Buy, matching the original part. This variant may be used interchangeably where available.

Frequently Asked Questions (FAQ)

Q: Can I use MC7905CTG as a direct replacement for UA7905CKCS?

A: MC7905CTG is not a direct replacement. While it provides -5V output in the same TO-220-3 package, its output current rating is 1A versus the 1.5A of the UA7905CKCS. Use MC7905CTG only if your application requires 1A or less.

Q: What is the difference between LM7905CT/NOPB and UA7905CKCS?

A: Both parts provide identical electrical performance: -5V output, 1.5A current, 1.1V dropout voltage, and TO-220-3 package. The primary difference is product status—LM7905CT/NOPB is Active while UA7905CKCS is Last Time Buy. LM7905CT/NOPB is the recommended long-term substitute.

Q: Are all substitutes pin-compatible with UA7905CKCS?

A: Yes. All listed substitutes use the TO-220-3 package with identical pin configuration, enabling direct PCB replacement without layout modifications.

Q: Does L7905ACV offer any advantages over LM7905CT/NOPB?

A: L7905ACV supports higher maximum input voltage (-35V versus -25V), providing greater design margin for applications with variable input supplies. Both parts are Active status. The choice depends on your input voltage requirements.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitutes meet RoHS3 compliance requirements, matching the environmental standards of the UA7905CKCS.

Q: Can I mix different substitute parts in the same production run?

A: All substitutes are functionally equivalent within their specified parameters and use identical packaging. However, verify that your specific application requirements are met by each part's electrical characteristics before mixing suppliers or part numbers in production.

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