CD214A-T33ALF Equivalent & Substitute Parts

Part Overview

The CD214A-T33ALF is a transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. This unidirectional Zener diode operates with a 33V reverse standoff voltage and provides 53.3V maximum clamping voltage at 7.5A peak pulse current. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

CD214A-T33ALF

Bourns Inc.In Stock: 1195CD214A-T33ALF Datasheet

Current PartRFQ

SMAJ33A

MDDIn Stock: 65153SMAJ33A Datasheet

DirectRFQ

SMAJ33A

MDDIn Stock: 65153SMAJ33A Datasheet

DirectRFQ

SM4T39AY

STMicroelectronicsIn Stock: 4543SM4T39AY Datasheet

SimilarRFQ

SMA6J33A-TR

STMicroelectronicsIn Stock: 5456SMA6J33A-TR Datasheet

SimilarRFQ

SMAJ33A-TP

Micro Commercial CoIn Stock: 4841SMAJ33A-TP Datasheet

SimilarRFQ

SMAJ33A-TR

STMicroelectronicsIn Stock: 20378SMAJ33A-TR Datasheet

SimilarRFQ

SMAJ36A-M3/61

Vishay General Semiconductor - Diodes DivisionIn Stock: 9675SMAJ36A-M3/61 Datasheet

SimilarRFQ

SZ1SMA33AT3G

Littelfuse Inc.In Stock: 16889SZ1SMA33AT3G Datasheet

SimilarRFQ

TV04A330J-G

Comchip TechnologyIn Stock: 6201TV04A330J-G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CD214A-T33ALF is determined by the following critical parameters:

• Voltage - Reverse Standoff: 33V (primary specification)
• Voltage - Clamping (Max) @ Ipp: 53.3V (maximum allowable clamp voltage)
• Current - Peak Pulse (10/1000µs): 7.5A (minimum pulse current rating)
• Power - Peak Pulse: 400W (minimum power dissipation)
• Package / Case: DO-214AC, SMA (physical and electrical interface)
• Mounting Type: Surface Mount (assembly compatibility)

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical electrical specifications (33V standoff, 53.3V clamp, 7.5A peak pulse, 400W power) and active product status. These provide one-to-one replacement capability.

Similar Alternatives: Parts with the same 33V standoff voltage and DO-214AC/SMA package but with different clamping voltages or peak pulse currents. These are suitable only when circuit design permits higher clamping voltages or current ratings.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

SMAJ33A-TP (Micro Commercial Co), SZ1SMA33AT3G (Littelfuse Inc.), and TV04A330J-G (Comchip Technology) are direct electrical equivalents with identical 33V standoff, 53.3V clamping, and 7.5A peak pulse specifications. All three are active products with ROHS3 compliance. SMAJ33A-TP offers the widest operating temperature range (-55°C ~ 175°C), while SZ1SMA33AT3G includes AEC-Q101 automotive qualification. SMAJ33A (MDD) is also a direct equivalent but operates at a reduced minimum temperature (-50°C vs. -55°C).

Alternative Substitutes (Higher Performance):

SMAJ33A-TR, SM4T39AY (both STMicroelectronics), and SMA6J33A-TR (STMicroelectronics) maintain the 33V standoff voltage but feature higher clamping voltages (69.7V or 60.8V) and significantly higher peak pulse currents (33A or 57A). These parts are suitable only when circuit design permits higher clamping voltages without exceeding component voltage ratings. SMA6J33A-TR provides the highest power dissipation (600W) and extended temperature range (-55°C ~ 175°C).

Not Recommended:

SMAJ36A-M3/61 (Vishay) has a 36V standoff voltage, which exceeds the CD214A-T33ALF specification and is not a suitable substitute for applications requiring 33V protection.

Frequently Asked Questions (FAQ)

Q: Can SMAJ33A-TR be used as a direct replacement for CD214A-T33ALF?

A: SMAJ33A-TR shares the same 33V standoff voltage and DO-214AC/SMA package but has a higher clamping voltage (69.7V vs. 53.3V) and significantly higher peak pulse current (33A vs. 7.5A). It is suitable only if the circuit design permits the higher clamping voltage without exceeding downstream component voltage ratings.

Q: What is the difference between the direct equivalents (SMAJ33A-TP, SZ1SMA33AT3G, TV04A330J-G)?

A: All three are electrically identical with 33V standoff, 53.3V clamping, and 7.5A peak pulse. Differences are in operating temperature ranges and certifications: SMAJ33A-TP extends to 175°C, SZ1SMA33AT3G includes AEC-Q101 automotive qualification, and TV04A330J-G operates -55°C ~ 150°C. Selection depends on application temperature requirements and automotive qualification needs.

Q: Is the CD214A-T33ALF package compatible with all substitute parts listed?

A: All substitute parts use the DO-214AC (SMA) surface-mount package, ensuring physical and electrical interface compatibility. Footprint and reflow soldering parameters remain consistent across all listed alternatives.

Q: Why is SMAJ36A-M3/61 listed if it has a different standoff voltage?

A: SMAJ36A-M3/61 has a 36V standoff voltage, which does not meet the 33V specification of the CD214A-T33ALF. It is not a suitable substitute and should not be selected for this application.

Q: Which substitute offers the best compliance and qualification for automotive applications?

A: SZ1SMA33AT3G (Littelfuse Inc.) includes AEC-Q101 automotive qualification and operates across an extended temperature range (-65°C ~ 150°C), making it the preferred choice for automotive-grade applications requiring direct electrical equivalence.