UA78M09CKTPR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The UA78M09CKTPR is a linear voltage regulator IC manufactured by Texas Instruments, designed to provide a fixed positive 9V output at 500mA in a TO-252-3 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The UA78M09CKTPR belongs to the Power Management (PMIC) category and is ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Key Parameters

Parameter	Value
Output Voltage (Fixed)	9V
Output Current	500mA
Input Voltage (Max)	26V
Voltage Dropout (Max)	2V @ 350mA
Output Configuration	Positive Fixed
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Operating Temperature Range	0°C ~ 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
PSRR	80dB (120Hz)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the UA78M09CKTPR is determined by the following critical parameters:

Fixed output voltage of 9V
Output current capability of 500mA minimum
TO-252-3 package compatibility (DPAK with 2 Leads + Tab, SC-63)
Surface mount mounting type
Positive fixed output configuration
ROHS3 compliance
Operating temperature range compatibility (minimum 0°C ~ 125°C or wider)

Substitute parts must maintain electrical equivalence across these parameters. Variations in input voltage maximum, dropout voltage specifications, PSRR values, and protection feature sets are acceptable provided the core functional requirements are met. Packaging format (Tape & Reel vs. Cut Tape) does not affect electrical substitution but impacts procurement and handling.

Parameter Comparison

Parameter	UA78M09CKTPR (Main)	UA78M09CKVURG3	BA178M09FP-E2	BA78M09FP-E2	MC78M09BDTRKG	MC78M09CDTRKG
Manufacturer	Texas Instruments	Texas Instruments	Rohm Semiconductor	Rohm Semiconductor	onsemi	onsemi
Output Voltage	9V	9V	9V	9V	9V	9V
Output Current	500mA	500mA	500mA	500mA	500mA	500mA
Input Voltage (Max)	26V	26V	26V	26V	35V	35V
Voltage Dropout (Max)	2V @ 350mA	2V @ 350mA	2V @ 500mA (Typ)	2V @ 500mA (Typ)	Not specified	Not specified
Package / Case	TO-252-3	TO-252-3	TO-252-3	TO-252-3	TO-252-3	TO-252-3
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	0°C ~ 125°C
PSRR	80dB (120Hz)	80dB (120Hz)	67dB (120Hz)	67dB (120Hz)	80dB (120Hz)	80dB (120Hz)
Protection Features	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature, Short Circuit	None specified	Over Current, Over Temperature	Over Temperature, Short Circuit	Over Temperature, Short Circuit
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: UA78M09CKVURG3

The UA78M09CKVURG3 is the manufacturer-recommended direct replacement from Texas Instruments. It maintains identical electrical specifications to the UA78M09CKTPR, including 9V fixed output, 500mA current capability, 26V maximum input voltage, and 80dB PSRR. Both parts share the same operating temperature range (0°C ~ 125°C) and identical protection features. The primary difference is product status: UA78M09CKVURG3 is active and available in Tape & Reel packaging. MSL rating differs (3 vs. 1), which may impact storage and handling requirements in high-humidity environments.

Secondary Recommendations: MC78M09BDTRKG and MC78M09CDTRKG

Both onsemi parts (MC78M09BDTRKG and MC78M09CDTRKG) provide functional equivalence with enhanced input voltage tolerance (35V maximum vs. 26V). MC78M09BDTRKG is active with extended operating temperature range (-40°C ~ 125°C), while MC78M09CDTRKG matches the original temperature range (0°C ~ 125°C) but is obsolete. Both maintain 500mA output current and 80dB PSRR. Protection features differ slightly: both include Over Temperature and Short Circuit protection, but lack Over Current protection specified in the original part.

Alternative Options: BA178M09FP-E2 and BA78M09FP-E2

Rohm Semiconductor parts BA178M09FP-E2 and BA78M09FP-E2 are active alternatives with identical 9V output and 500mA current capability. Both feature 26V maximum input voltage and TO-252-3 packaging. Operating temperature range is narrower (-40°C ~ 85°C), which may not meet applications requiring 0°C minimum operation. PSRR is reduced to 67dB (120Hz). BA178M09FP-E2 has no specified protection features, while BA78M09FP-E2 includes Over Current and Over Temperature protection. Both maintain ROHS3 compliance and MSL 1 rating.

All substitute parts are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can I use MC78M09BDTRKG or MC78M09CDTRKG as direct replacements for UA78M09CKTPR?

A: Yes. Both onsemi parts provide functional equivalence with 9V fixed output, 500mA current capability, and TO-252-3 packaging. MC78M09BDTRKG is preferred as it is active and supports extended operating temperature (-40°C ~ 125°C). The higher input voltage maximum (35V vs. 26V) provides additional design margin. Protection features differ: onsemi parts omit Over Current protection but include Over Temperature and Short Circuit protection.

Q: What is the difference between UA78M09CKVURG3 and the original UA78M09CKTPR?

A: Electrical specifications are identical: 9V output, 500mA current, 26V input maximum, 80dB PSRR, and identical protection features. The primary difference is product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. unspecified). MSL rating differs (3 vs. 1), requiring different storage conditions. UA78M09CKVURG3 is the manufacturer-recommended replacement.

Q: Are Rohm Semiconductor parts (BA178M09FP-E2, BA78M09FP-E2) suitable substitutes?

A: Both Rohm parts meet core electrical requirements (9V output, 500mA current, TO-252-3 package). However, operating temperature range is narrower (-40°C ~ 85°C vs. 0°C ~ 125°C), which may not support applications requiring 0°C minimum operation. PSRR is reduced to 67dB. These parts are suitable for applications within the -40°C ~ 85°C range.

Q: Does packaging format (Tape & Reel vs. Cut Tape) affect electrical substitution?

A: No. Packaging format affects procurement, handling, and storage procedures but does not impact electrical performance or functionality. All substitute parts in TO-252-3 package are electrically equivalent regardless of packaging format.

Q: Which substitute part has the best protection feature coverage?

A: UA78M09CKVURG3 and BA78M09FP-E2 both include Over Current, Over Temperature, and Short Circuit protection (BA78M09FP-E2 omits Short Circuit). MC78M09BDTRKG and MC78M09CDTRKG include Over Temperature and Short Circuit protection but omit Over Current protection. BA178M09FP-E2 has no specified protection features.

Q: Can I use parts with different input voltage maximums (26V vs. 35V)?

A: Yes. Parts with 35V maximum input voltage (MC78M09BDTRKG, MC78M09CDTRKG) are backward compatible with designs using 26V maximum parts. The higher rating provides additional design margin and protection against input voltage transients. No circuit modifications are required.

Q: What is the significance of MSL rating differences?

A: MSL 1 (Unlimited) allows indefinite storage without moisture absorption concerns. MSL 3 (168 Hours) requires controlled storage conditions and limits shelf life to 168 hours after packaging opening. UA78M09CKVURG3 (MSL 3) requires more stringent handling than alternatives with MSL 1 rating.

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