SA24A Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA24A is a unidirectional Zener-type transient voltage suppressor diode manufactured by onsemi, designed for general-purpose overvoltage protection applications. The device features a 24V reverse standoff voltage with a 38.9V maximum clamping voltage and 12.8A peak pulse current capability in a through-hole DO-15 package. The SA24A is classified as obsolete, making identification of functionally equivalent active alternatives necessary for new designs and ongoing production support.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	24	V
Voltage - Breakdown (Min)	26.7	V
Voltage - Clamping (Max) @ Ipp	38.9	V
Current - Peak Pulse (10/1000µs)	12.8	A
Power - Peak Pulse	500	W
Type	Zener	—
Unidirectional Channels	1	—
Mounting Type	Through Hole	—
Package / Case	DO-204AC, DO-15, Axial	—
Applications	General Purpose	—

Substitute Part Grouping Explanation

Substitution of the SA24A is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must be 24V to maintain circuit protection thresholds
Voltage - Clamping (Max) @ Ipp: Must be 38.9V or lower to ensure adequate transient suppression
Current - Peak Pulse (10/1000µs): Must be ≥12.8A to handle specified surge conditions
Power - Peak Pulse: Must be ≥500W to dissipate transient energy
Type: Zener unidirectional diode
Mounting Type: Through Hole
Package Compatibility: DO-15 (DO-204AC) or equivalent axial packages

Substitute parts are categorized as:

Direct Equivalents: Identical electrical specifications and package format (SA24A from Fairchild Semiconductor, P5KE24A variants from Micro Commercial Co, SA24A-TP from Micro Commercial Co)

Similar Alternatives: Meet or exceed key electrical parameters with compatible through-hole packages but may differ in clamping voltage, peak current, or power dissipation (P6KE27A, 1N6465, LCE24A, LCE26A, LCE28A)

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Product Status
SA24A	onsemi	24	38.9	12.8	500	DO-15	Obsolete
P6KE27A	Fairchild Semiconductor	23.1	37.5	16.8	600	DO-15 (DO-204AC)	Active
SA24A	Fairchild Semiconductor	24	38.9	13.1	500	DO-204AC (DO-15)	Obsolete
1N6465	Microchip Technology	24	41.4	69 (8/20µs)	500	B, Axial	Active
LCE24A	Littelfuse Inc.	24	38.9	39	1500	DO-201	Active
LCE26A	Littelfuse	26	42.1	36	1500	DO-201	Active
LCE28A	Littelfuse Inc.	28	45.5	33	1500	DO-201	Active
P5KE24A-AP	Micro Commercial Co	24	38.9	12.8	500	DO-15	Active
P5KE24A-BP	Micro Commercial Co	24	38.9	12.8	500	DO-15	Active
P5KE24A-TP	Micro Commercial Co	24	38.9	12.8	500	DO-15	Active
SA24A-TP	Micro Commercial Co	24	38.9	13.1	500	DO-15	Active

Engineering Selection Recommendations

Preferred Direct Substitutes (Identical Specifications)

P5KE24A-TP, P5KE24A-BP, and P5KE24A-AP from Micro Commercial Co are direct electrical equivalents with active product status. These parts maintain the 24V reverse standoff, 38.9V clamping voltage, 12.8A peak pulse current, and 500W power dissipation. All three variants are available in DO-15 packages and carry REACH Unaffected status with EAR99 ECCN classification.

SA24A-TP from Micro Commercial Co provides an alternative with marginally higher peak pulse current (13.1A) while maintaining all other critical parameters. This part is active and available in DO-15 package format.

Alternative Substitutes (Enhanced Performance)

LCE24A from Littelfuse Inc. matches the 24V reverse standoff and 38.9V clamping voltage but offers significantly higher peak pulse current (39A) and power dissipation (1500W). The DO-201 package is mechanically compatible with through-hole mounting. This part is RoHS3 compliant and active.

P6KE27A from Fairchild Semiconductor provides 23.1V reverse standoff with 37.5V clamping voltage and enhanced current handling (16.8A) and power dissipation (600W). The DO-15 package maintains form-factor compatibility. This part is active with EAR99 ECCN classification.

Higher Voltage Alternatives

LCE26A and LCE28A from Littelfuse Inc. are suitable only when circuit design permits higher standoff voltages (26V and 28V respectively). These parts offer superior current and power ratings in DO-201 packages and are RoHS3 compliant.

1N6465 from Microchip Technology operates at 24V standoff with significantly higher peak pulse current (69A at 8/20µs) in an axial package. This part is active but RoHS non-compliant.

Frequently Asked Questions (FAQ)

Q: Can I use P5KE24A-TP as a direct replacement for SA24A?

A: Yes. P5KE24A-TP is electrically identical with 24V reverse standoff, 38.9V clamping voltage, 12.8A peak pulse current, and 500W power dissipation. Both use DO-15 through-hole packages. P5KE24A-TP is active, addressing the obsolescence of the original SA24A.

Q: What is the difference between P5KE24A-TP, P5KE24A-BP, and P5KE24A-AP?

A: These three variants are electrically identical. The suffix designates different packaging or tape configurations from Micro Commercial Co. All three maintain the same electrical specifications and DO-15 package format.

Q: Can I use LCE24A instead of SA24A?

A: LCE24A is electrically compatible with identical 24V standoff and 38.9V clamping voltage. However, it uses a DO-201 package instead of DO-15. Mechanical board layout modifications may be required. LCE24A offers higher current (39A) and power (1500W) ratings, providing enhanced protection margin.

Q: Why would I choose P6KE27A over P5KE24A-TP?

A: P6KE27A offers higher peak pulse current (16.8A) and power dissipation (600W) compared to 12.8A and 500W. The reverse standoff is 23.1V versus 24V. Selection depends on whether the circuit requires enhanced transient suppression capability or strict 24V standoff adherence.

Q: Are there RoHS compliance differences between substitutes?

A: Yes. P5KE24A variants and SA24A-TP carry REACH Unaffected status without explicit RoHS certification. LCE24A, LCE26A, and LCE28A are RoHS3 compliant. 1N6465 is RoHS non-compliant. Verify compliance requirements for your application before selection.

Q: Can I use 1N6465 as a substitute?

A: 1N6465 maintains 24V reverse standoff with significantly higher peak pulse current (69A). The axial package format is mechanically different from DO-15. This part is active and suitable for applications requiring enhanced current handling, but board layout changes are necessary.

Q: What happens if I use LCE26A or LCE28A?

A: These parts operate at higher reverse standoff voltages (26V and 28V respectively) and higher clamping voltages (42.1V and 45.5V). They are suitable only if circuit design permits these higher protection thresholds. Both offer superior current and power ratings in DO-201 packages.

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