P6SMB24C Equivalent & Substitute Parts

Part Overview

The P6SMB24C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a reverse standoff voltage of 20.5V and provides clamping at 34.86V with a peak pulse current of 18.4A. The P6SMB24C is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Reverse Standoff Voltage (Typ)	20.5V
Breakdown Voltage (Min)	21.6V
Clamping Voltage (Max) @ Ipp	34.86V
Peak Pulse Current (10/1000µs)	18.4A
Peak Pulse Power	600W
Operating Temperature Range	-55°C to 150°C (TJ)
Package Type	DO-214AA (SMB)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the P6SMB24C is determined by the following critical parameters:

Reverse Standoff Voltage: Must be 20.5V (Typ)
Breakdown Voltage (Min): Must be within 21.6V to 22.8V range
Clamping Voltage (Max) @ Ipp: Acceptable range 33.2V to 34.86V
Peak Pulse Current: Minimum 18.0A (10/1000µs pulse)
Peak Pulse Power: 600W
Package: DO-214AA (SMB) surface mount
Operating Temperature: Minimum -55°C to 150°C
Bidirectional Channels: 1 channel
Type: Zener diode

Substitute parts are grouped into two categories based on clamping voltage performance:

Group A (Lower Clamping Voltage 33.2V): P6SMB24CA, P6SMB24CA-M3/52, P6SMB24CA-M3/5B, SZP6SMB24CAT3G, SM6T24CA-E3/52, SMBJP6KE24CA-TP

Group B (Higher Clamping Voltage 42.8V): SM6T24CA, SM6T24CAY

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Breakdown Min (V)	Clamping Max @ Ipp (V)	Peak Pulse Current (A)	Operating Temp (°C)	Product Status	Package
P6SMB24C	Littelfuse Inc.	20.5	21.6	34.86	18.4	-55 to 150	Obsolete	DO-214AA (SMB)
P6SMB24CA	Eaton - Electronics Division	20.5	22.8	33.2	18.4	-55 to 150	Active	DO-214AA (SMB)
P6SMB24CA-M3/52	Vishay General Semiconductor	20.5	22.8	33.2	18.1	-65 to 150	Active	DO-214AA (SMB)
P6SMB24CA-M3/5B	Vishay General Semiconductor	20.5	22.8	33.2	18.1	-65 to 150	Active	DO-214AA (SMB)
SZP6SMB24CAT3G	Littelfuse Inc.	20.5	22.8	33.2	18.0	-65 to 150	Active	DO-214AA (SMB)
SM6T24CA-E3/52	Vishay General Semiconductor	20.5	22.8	33.2	18.0	-65 to 150	Active	DO-214AA (SMB)
SMBJP6KE24CA-TP	Micro Commercial Co	20.5	22.8	33.2	18.4	-55 to 175	Active	DO-214AA (SMB)
SM6T24CA	STMicroelectronics	20.5	22.8	42.8	93 (8/20µs)	-55 to 150	Active	DO-214AA (SMB)
SM6T24CAY	STMicroelectronics	20.5	22.8	42.8	93 (8/20µs)	-55 to 150	Active	DO-214AA (SMB)

Engineering Selection Recommendations

Primary Substitutes (Group A - 33.2V Clamping)

P6SMB24CA, P6SMB24CA-M3/52, P6SMB24CA-M3/5B, SZP6SMB24CAT3G, SM6T24CA-E3/52, and SMBJP6KE24CA-TP are direct functional equivalents with clamping voltages of 33.2V. All are active products with ROHS3 compliance. The Vishay parts (P6SMB24CA-M3/52, P6SMB24CA-M3/5B, SM6T24CA-E3/52) and SZP6SMB24CAT3G offer extended operating temperature ranges (-65°C to 150°C) compared to the original part. SMBJP6KE24CA-TP extends the upper temperature limit to 175°C. The Eaton P6SMB24CA maintains the original temperature range of -55°C to 150°C.

Secondary Substitutes (Group B - 42.8V Clamping)

SM6T24CA and SM6T24CAY from STMicroelectronics provide higher clamping voltage (42.8V) and significantly higher peak pulse current (93A at 8/20µs pulse). These parts are suitable only when the application can tolerate higher clamping voltage. SM6T24CAY includes automotive-grade qualification (AEC-Q101). Both maintain the 600W peak pulse power rating and ROHS3 compliance.

Compliance and Certification

All substitute parts are ROHS3 compliant with MSL rating of 1 (Unlimited). SZP6SMB24CAT3G and SM6T24CAY carry automotive-grade qualification (AEC-Q101). All parts are classified as active products, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can I use SM6T24CA or SM6T24CAY as direct replacements for P6SMB24C?

A: SM6T24CA and SM6T24CAY have higher clamping voltage (42.8V vs. 34.86V) and significantly higher peak pulse current (93A vs. 18.4A). These parts are functionally compatible only if your circuit design can accommodate the higher clamping voltage. They are not pin-for-pin electrical equivalents in terms of voltage performance.

Q: What is the difference between P6SMB24CA-M3/52 and P6SMB24CA-M3/5B?

A: Both parts are manufactured by Vishay General Semiconductor with identical electrical specifications (20.5V standoff, 33.2V clamping, 18.1A peak current). The difference lies in packaging: P6SMB24CA-M3/52 uses Tape & Box (TB) packaging, while P6SMB24CA-M3/5B also uses Tape & Box (TB). Both support the same DO-214AA (SMBJ) supplier device package.

Q: Are there temperature range differences between substitutes?

A: Yes. The original P6SMB24C operates from -55°C to 150°C. Vishay parts (P6SMB24CA-M3/52, P6SMB24CA-M3/5B, SM6T24CA-E3/52) and SZP6SMB24CAT3G extend the lower limit to -65°C. SMBJP6KE24CA-TP extends the upper limit to 175°C. Select based on your application's thermal requirements.

Q: Which substitute offers the best availability?

A: SM6T24CA-E3/52 from Vishay has the highest inventory (30,200 pcs), followed by P6SMB24CA from Eaton (19,668 pcs). Both are active products with established supply chains.

Q: Is SZP6SMB24CAT3G suitable for automotive applications?

A: SZP6SMB24CAT3G carries automotive-grade qualification (AEC-Q101) and is manufactured by Littelfuse Inc. It is suitable for automotive applications requiring transient voltage suppression with 20.5V standoff and 33.2V clamping specifications.

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

A: All Group A substitutes (33.2V clamping) are electrically interchangeable within the specified parameter tolerances. However, maintain consistency within a single PCB assembly to ensure uniform protection characteristics across all protected circuits.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message