P6KE20A-TP Transient Voltage Suppressor Diode: Equivalent & Substitute Parts

Part Overview

The P6KE20A-TP is an active Transient Voltage Suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in through-hole applications. This unidirectional Zener diode operates with a reverse standoff voltage of 17.1V and provides clamping at 27.7V with a peak pulse current capability of 22A. The component is housed in a DO-15 (DO-204AC) axial package and is ROHS3 compliant with unlimited moisture sensitivity rating. Equivalent and substitute parts are identified based on matching or superior electrical performance within compatible package configurations, ensuring functional interchangeability for circuit protection applications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	17.1	V
Voltage - Breakdown (Min)	19	V
Voltage - Clamping (Max) @ Ipp	27.7	V
Current - Peak Pulse (10/1000µs)	22	A
Power - Peak Pulse	600	W
Operating Temperature Range	-55 to 175	°C (TJ)
Package / Case	DO-204AC, DO-15, Axial	—
Mounting Type	Through Hole	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the P6KE20A-TP is determined by the following critical parameters: voltage rating (reverse standoff and clamping voltage), peak pulse current capability, power dissipation rating, package type, and mounting configuration. Parts are classified into two substitution categories:

Direct Equivalents maintain identical electrical specifications (17.1V standoff, 27.7V clamping, 22A peak pulse, 600W power rating) within the same DO-15 package footprint. These parts are fully interchangeable without circuit modification.

Similar Substitutes provide equivalent or superior voltage protection with different package configurations or enhanced current/power ratings. These parts are suitable when circuit board layout permits alternative package types (DO-201) or when higher transient current handling is required. Voltage ratings must remain within the 15.3V to 17.1V standoff range and 25.2V to 27.7V clamping range to maintain circuit protection integrity.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Operating Temp (°C)	Product Status
P6KE20A-TP	Micro Commercial Co	17.1	27.7	22	600	DO-15	-55 to 175	Active
P6KE20A	Fairchild Semiconductor	17.1	27.7	22	600	DO-15	-50 to 175	Active
P6KE20A-B	Littelfuse	17.1	27.7	22	600	DO-15	-55 to 175	Active
P6KE18A	Fairchild Semiconductor	15.3	25.2	25	600	DO-15	-50 to 175	Active
1.5KE18A	Taiwan Semiconductor Corporation	15.3	25.5	60	1500	DO-201	-55 to 175	Active
1.5KE20A	Taiwan Semiconductor Corporation	17.1	27.7	56	1500	DO-201	-55 to 175	Active
SLD15U-017	Littelfuse Inc.	15	24.4	209	5000	P600	-55 to 175	Active
SLD15U-017-B	Littelfuse Inc.	15	24.4	209	5000	P600	-55 to 175	Active

Engineering Selection Recommendations

For Direct Replacement (Same Electrical and Package Specifications):

The P6KE20A from Fairchild Semiconductor and P6KE20A-B from Littelfuse are direct equivalents to the P6KE20A-TP. Both maintain identical voltage ratings (17.1V standoff, 27.7V clamping), current capability (22A peak pulse), and power dissipation (600W) within the DO-15 package. All three parts are ROHS3 compliant and carry Active product status. The Fairchild variant operates across -50°C to 175°C, while both Micro Commercial Co and Littelfuse variants extend to -55°C. Selection between these three parts depends on availability, packaging preference (Cut Tape vs. Bulk), and supply chain requirements.

For Enhanced Current Handling (Same Voltage, Higher Power Rating):

The 1.5KE20A from Taiwan Semiconductor Corporation provides identical voltage protection (17.1V standoff, 27.7V clamping) with significantly enhanced transient current capacity (56A vs. 22A) and power dissipation (1500W vs. 600W). This part requires a DO-201 package footprint and is suitable for applications experiencing higher transient energy levels. The 1.5KE20A maintains the full -55°C to 175°C operating range and ROHS3 compliance.

For Lower Voltage Applications (15.3V Standoff Range):

The P6KE18A from Fairchild Semiconductor and 1.5KE18A from Taiwan Semiconductor Corporation are suitable for circuits requiring lower voltage protection thresholds (15.3V standoff, 25.2V to 25.5V clamping). The P6KE18A maintains the DO-15 package with 600W power rating, while the 1.5KE18A offers enhanced performance in a DO-201 package with 1500W capability and 60A peak pulse current.

For High-Energy Transient Protection (Automotive Grade):

The SLD15U-017 and SLD15U-017-B from Littelfuse Inc. are automotive-grade TVS diodes (AEC-Q101 qualified) with exceptional transient handling capability (209A peak pulse, 5000W power dissipation) in a P600 package. These parts operate at 15V standoff with 24.4V clamping and are suitable for high-energy transient environments. Both variants are ROHS3 compliant with Active product status.

Frequently Asked Questions (FAQ)

Q: Can I use P6KE20A from Fairchild Semiconductor as a direct replacement for P6KE20A-TP?

A: Yes. Both parts share identical electrical specifications (17.1V standoff, 27.7V clamping, 22A peak pulse, 600W power rating) and the same DO-15 package configuration. The only difference is the operating temperature minimum: Fairchild extends to -50°C while Micro Commercial Co extends to -55°C. For applications not requiring the extended lower temperature range, this substitution is fully compatible.

Q: What is the difference between DO-15 and DO-201 packages?

A: DO-15 and DO-201 are both axial through-hole packages for diodes, but differ in physical dimensions and power dissipation capability. DO-15 is a smaller package suitable for 600W applications, while DO-201 is larger and designed for higher power dissipation (1500W and above). Circuit board layout and thermal management requirements determine which package is appropriate. Both are through-hole mounted with compatible lead spacing for standard PCB designs.

Q: Can I substitute the P6KE20A-TP with the 1.5KE20A for higher transient current protection?

A: Yes, with package footprint consideration. The 1.5KE20A maintains identical voltage ratings (17.1V standoff, 27.7V clamping) but requires a DO-201 package instead of DO-15. This substitution is suitable when circuit board layout permits the larger package and when higher transient current handling (56A vs. 22A) and power dissipation (1500W vs. 600W) are required. Verify PCB pad spacing compatibility before implementation.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant. The SLD15U-017-B variant carries REACH Unaffected status, while SLD15U-017 is REACH Affected. Verify compliance requirements for your specific application and supply chain regulations.

Q: What is the difference between P6KE20A-B and P6KE20A-TP?

A: Both parts are electrically identical (17.1V standoff, 27.7V clamping, 22A peak pulse, 600W power rating) in DO-15 packages with ROHS3 compliance and -55°C to 175°C operating range. The primary difference is packaging: P6KE20A-TP is supplied in Cut Tape (CT) format, while P6KE20A-B is supplied in Bulk format. Selection depends on assembly process requirements and tape-and-reel vs. bulk component handling.

Q: Can I use the SLD15U-017 in place of the P6KE20A-TP?

A: The SLD15U-017 is not a direct substitute due to different voltage ratings (15V standoff vs. 17.1V) and package type (P600 vs. DO-15). However, it provides superior transient protection capability (209A peak pulse, 5000W power dissipation) and is automotive-grade qualified. Use this part only if circuit protection requirements permit the lower voltage threshold and if the P600 package footprint is compatible with your PCB design.

Q: What parameters must match for a TVS diode to be considered a substitute?

A: Critical matching parameters are: reverse standoff voltage (within the 15.3V to 17.1V range for this application), clamping voltage (within 25.2V to 27.7V range), peak pulse current capability (minimum 22A for equivalent protection), and power dissipation rating (minimum 600W for equivalent protection). Package type and mounting configuration must be compatible with circuit board layout. Operating temperature range should meet or exceed application requirements.

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