SA5.0 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA5.0 is a 5V Zener transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in through-hole applications. The device features a 9.66V maximum clamping voltage and 55.4A peak pulse current capability in a DO-204AC (DO-15) axial package. The SA5.0 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. Active alternatives with comparable electrical characteristics and identical mounting form factors are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	5	V
Voltage - Breakdown (Min)	6.03	V
Voltage - Clamping (Max) @ Ipp	9.66	V
Current - Peak Pulse (10/1000µs)	55.4	A
Power - Peak Pulse	500	W
Operating Temperature Range	-55 to 175	°C
Mounting Type	Through Hole	-
Package / Case	DO-204AC, DO-15, Axial	-
Type	Zener	-
Unidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitution eligibility for the SA5.0 is determined by the following critical parameters:

Electrical Compatibility Criteria:

Voltage - Reverse Standoff (Typ): 5V (exact match required)
Voltage - Clamping (Max) @ Ipp: 9.2V to 10V (acceptable range for general-purpose protection)
Current - Peak Pulse (10/1000µs): 44A minimum (SA5.0 baseline is 55.4A)
Power - Peak Pulse: 500W minimum
Operating Temperature Range: -55°C to 175°C (minimum requirement)

Mechanical Compatibility Criteria:

Mounting Type: Through Hole (required)
Package / Case: DO-204AC, DO-15, or Axial equivalent (required for PCB compatibility)
Type: Zener (required)
Unidirectional Channels: 1 (required)

Compliance Criteria:

RoHS3 Compliant (preferred for regulatory alignment)
Product Status: Active (preferred for long-term availability)

Substitute parts are grouped into two categories: direct electrical equivalents with identical clamping voltage (9.2V) and functional alternatives with slightly higher clamping voltage (10V) that remain within acceptable protection parameters for general-purpose applications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Package	Product Status
SA5.0	Littelfuse Inc.	5	9.66	55.4	500	-55 to 175	DO-204AC	Obsolete
SA5.0A	Taiwan Semiconductor Corporation	5	9.2	57	500	-55 to 175	DO-204AC	Active
5KP5.0A	Littelfuse Inc.	5	9.2	554.3	5000	-55 to 175	P600	Active
P5KE5.0A-AP	Micro Commercial Co	5	9.2	54.3	500	-65 to 175	DO-15	Active
P5KE5.0A-TP	Micro Commercial Co	5	9.2	54.3	500	-65 to 175	DO-15	Active
SA5.0A-TP	Micro Commercial Co	5	9.2	55.4	500	-55 to 175	DO-15	Active
SAC5.0-AP	Micro Commercial Co	5	10	44	500	-55 to 175	DO-15	Active
SAC5.0-BP	Micro Commercial Co	5	10	44	500	-55 to 175	DO-15	Active
SAC5.0-E3/54	Vishay General Semiconductor - Diodes Division	5	10	44	500	-55 to 175	DO-204AC	Active
SAC5.0-E3/73	Vishay General Semiconductor - Diodes Division	5	10	44	500	-55 to 175	DO-204AC	Active
SAC5.0-TP	Micro Commercial Co	5	10	44	500	-55 to 175	DO-15	Active

Engineering Selection Recommendations

Direct Electrical Equivalents (9.2V Clamping):

SA5.0A (Taiwan Semiconductor Corporation) and SA5.0A-TP (Micro Commercial Co) provide the closest electrical match to the SA5.0, with 9.2V clamping voltage and comparable peak pulse current. Both are active products with RoHS3 compliance and identical operating temperature ranges. SA5.0A offers higher peak pulse current (57A) than the original specification. SA5.0A-TP maintains the exact 55.4A specification and is available in higher volume (7,297 pcs).

P5KE5.0A-AP and P5KE5.0A-TP (Micro Commercial Co) are functionally equivalent with 9.2V clamping and 54.3A peak pulse current. Both support extended low-temperature operation (-65°C minimum) and are active products. These parts are suitable for applications requiring enhanced cold-temperature performance.

Functional Alternatives (10V Clamping):

SAC5.0-E3/54 and SAC5.0-E3/73 (Vishay General Semiconductor - Diodes Division) are active TransZorb® series devices with 10V clamping voltage and 44A peak pulse current. Both maintain DO-204AC packaging compatibility with the original SA5.0 and include RoHS3 compliance. The 0.34V increase in clamping voltage remains within acceptable protection parameters for general-purpose applications.

SAC5.0-AP, SAC5.0-BP, and SAC5.0-TP (Micro Commercial Co) offer 10V clamping with 44A peak pulse current in DO-15 packaging. All three are active products with full compliance certifications. SAC5.0-TP is available in Tape & Reel format for automated assembly.

High-Power Alternative:

5KP5.0A (Littelfuse Inc.) is a P600-packaged device with significantly higher power dissipation capability (5000W vs. 500W) and peak pulse current (554.3A). This part is suitable only for applications requiring substantially higher transient energy absorption and is not recommended as a direct replacement for standard general-purpose protection circuits.

Frequently Asked Questions (FAQ)

Q: Can I use SAC5.0 series parts as direct replacements for SA5.0?

A: SAC5.0 series parts are functionally compatible substitutes with a 0.34V higher clamping voltage (10V vs. 9.66V). This difference remains within acceptable limits for general-purpose overvoltage protection. All SAC5.0 variants maintain the required 5V reverse standoff voltage, 500W peak pulse power, and through-hole mounting compatibility. Product status is active across all SAC5.0 variants, ensuring long-term availability.

Q: What is the difference between SA5.0A and SA5.0A-TP?

A: Both parts are electrically identical with 5V reverse standoff, 9.2V clamping voltage, and 500W peak pulse power. SA5.0A is manufactured by Taiwan Semiconductor Corporation, while SA5.0A-TP is manufactured by Micro Commercial Co. SA5.0A-TP is available in higher volume (7,297 pcs) and is packaged in Cut Tape format. Selection depends on procurement availability and assembly process requirements.

Q: Why does 5KP5.0A have such different specifications?

A: The 5KP5.0A is a higher-power variant designed for applications requiring substantially greater transient energy absorption. With 5000W peak pulse power and 554.3A peak pulse current, it is not a direct replacement for the SA5.0 in standard general-purpose circuits. Use this part only when circuit requirements explicitly demand higher power dissipation capability.

Q: Are all substitute parts RoHS3 compliant?

A: Most substitute parts listed are RoHS3 compliant. SAC5.0-AP and SAC5.0-BP do not specify RoHS status in the provided data. Verify RoHS compliance with the manufacturer if regulatory certification is required for your application.

Q: Can I use parts with -65°C minimum operating temperature in place of -55°C minimum?

A: Yes. P5KE5.0A-AP and P5KE5.0A-TP support -65°C minimum operating temperature, which exceeds the SA5.0 specification of -55°C. These parts are suitable for applications requiring enhanced cold-temperature performance and are fully backward compatible with circuits designed for -55°C operation.

Q: What packaging considerations apply when selecting a substitute?

A: The SA5.0 uses DO-204AC (DO-15) axial packaging. Direct mechanical replacements include SA5.0A, SAC5.0-E3/54, and SAC5.0-E3/73, which maintain identical DO-204AC packaging. P5KE5.0A-AP, P5KE5.0A-TP, SA5.0A-TP, SAC5.0-AP, SAC5.0-BP, and SAC5.0-TP use DO-15 packaging, which is mechanically compatible with DO-204AC footprints. The 5KP5.0A uses P600 packaging and requires PCB layout modification.

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