CD214C-T33ALF Equivalent & Substitute Parts

Part Overview

The CD214C-T33ALF is a 33V Transient Voltage Suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. This unidirectional Zener diode features a 53.3V maximum clamping voltage and 28.1A peak pulse current capability in the DO-214AB (SMC) package. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	CD214C-T33ALF
Manufacturer	Bourns Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	33V
Voltage - Breakdown (Min)	36.7V
Voltage - Clamping (Max) @ Ipp	53.3V
Current - Peak Pulse (10/1000µs)	28.1A
Power - Peak Pulse	1500W
Package / Case	DO-214AB, SMC
Operating Temperature	-55°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the CD214C-T33ALF is determined by strict electrical and mechanical compatibility criteria:

Primary Substitution Criteria (Direct Equivalents):

Voltage - Reverse Standoff: 33V
Voltage - Breakdown (Min): 36.7V
Voltage - Clamping (Max) @ Ipp: 53.3V
Current - Peak Pulse (10/1000µs): 28.1A to 28.2A
Power - Peak Pulse: 1500W
Package / Case: DO-214AB, SMC
Unidirectional Channels: 1

Secondary Substitution Criteria (Higher Power Alternatives):

Same voltage parameters (33V standoff, 36.7V breakdown, 53.3V clamping)
Higher peak pulse current and power ratings (5000W series)
Same package / case: DO-214AB, SMC
Unidirectional configuration

Parts are grouped as Direct Equivalents (matching all electrical specifications) or Similar Parts (matching voltage parameters with higher power ratings for applications requiring increased transient energy absorption).

Parameter Comparison

Parameter	CD214C-T33ALF (Main)	SMCJ33A (MDD)	5.0SMDJ33A (TSC)	5.0SMDJ33A-T7 (Littelfuse)	SMCJ33A-HR (Littelfuse)	SMCJ33A-HRA (Littelfuse)	SMCJ33A-HRAT7 (Littelfuse)	SMCJ33A-TR (STMicroelectronics)	SMDJ33A (AOS)
Voltage - Reverse Standoff (Typ)	33V	33V	33V	33V	33V	33V	33V	33V	33V
Voltage - Breakdown (Min)	36.7V	36.7V	36.7V	36.7V	36.7V	36.7V	36.7V	36.7V	36.7V
Voltage - Clamping (Max) @ Ipp	53.3V	53.3V	53.3V	53.3V	53.3V	53.3V	53.3V	69.7V	53.3V
Current - Peak Pulse (10/1000µs)	28.1A	28.2A	93.9A	93.9A	28.2A	28.2A	28.2A	143A (8/20µs)	56.3A
Power - Peak Pulse	1500W	1500W	5000W	5000W	1500W	1500W	1500W	1500W	3000W
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC
Operating Temperature	-55°C ~ 150°C	-50°C ~ 150°C	-55°C ~ 175°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-55°C ~ 150°C	-55°C ~ 150°C
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

SMCJ33A (MDD), SMCJ33A-HR (Littelfuse), SMCJ33A-HRA (Littelfuse), and SMCJ33A-HRAT7 (Littelfuse) provide electrical and mechanical equivalence to the CD214C-T33ALF. All are active products with ROHS3 compliance and identical voltage specifications (33V standoff, 36.7V breakdown, 53.3V clamping) and 1500W power rating. Peak pulse current specifications are 28.2A, matching the original 28.1A within acceptable engineering tolerance. These parts are suitable for direct replacement in existing designs without circuit modification.

Higher Power Alternatives (For Enhanced Transient Protection):

5.0SMDJ33A (Taiwan Semiconductor Corporation) and 5.0SMDJ33A-T7 (Littelfuse) maintain identical voltage parameters while providing 5000W peak pulse power and 93.9A peak pulse current. These are applicable when circuit requirements demand increased transient energy absorption capability. SMDJ33A (Alpha & Omega Semiconductor Inc.) offers 3000W power with 56.3A peak pulse current as an intermediate option.

Voltage Deviation Consideration:

SMCJ33A-TR (STMicroelectronics) exhibits a higher clamping voltage of 69.7V and peak pulse current of 143A (8/20µs), representing a deviation from the primary specification. This part is suitable only for applications where the higher clamping voltage is acceptable and does not violate circuit protection thresholds.

All substitute parts maintain DO-214AB (SMC) package compatibility, ROHS3 compliance, and active product status, ensuring long-term availability and regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can SMCJ33A (MDD) directly replace CD214C-T33ALF without circuit modification?

A: Yes. SMCJ33A matches all critical electrical parameters: 33V reverse standoff voltage, 36.7V breakdown voltage, 53.3V clamping voltage, and 28.2A peak pulse current. The DO-214AB (SMC) package is identical. No circuit changes are required.

Q: What is the difference between the 1500W and 5000W TVS diode options?

A: The 1500W series (SMCJ33A variants) and 5000W series (5.0SMDJ33A variants) share identical voltage specifications but differ in peak pulse current and power dissipation capability. The 5000W series absorbs greater transient energy, suitable for applications with higher surge current exposure. Voltage clamping performance remains equivalent at 53.3V.

Q: Are Littelfuse SMCJ33A-HR, SMCJ33A-HRA, and SMCJ33A-HRAT7 interchangeable?

A: Yes. These three Littelfuse variants are electrically equivalent with identical voltage and current specifications. The suffix designations (-HR, -HRA, -HRAT7) indicate packaging and tape configuration differences. Selection depends on procurement and assembly requirements rather than electrical performance.

Q: Why does SMCJ33A-TR (STMicroelectronics) show 69.7V clamping voltage instead of 53.3V?

A: SMCJ33A-TR exhibits a higher clamping voltage due to different internal design characteristics while maintaining the same 33V reverse standoff specification. This part is suitable only when the circuit design accommodates the higher clamping voltage without exceeding component voltage ratings downstream.

Q: Is the operating temperature range difference significant between substitutes?

A: Operating temperature ranges vary from -50°C to -65°C minimum and 150°C to 175°C maximum across the substitute options. For applications operating within -55°C to 150°C, all substitutes are suitable. Applications requiring extended temperature operation should select parts with matching or superior temperature ratings.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts maintain ROHS3 compliance and are classified under ECCN EAR99 with HTSUS code 8541.10.0080. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts, indicating no special moisture handling requirements during storage or assembly.

Q: Can I use a higher power-rated TVS diode in place of the 1500W original?

A: Yes, if circuit design permits. Higher power-rated parts (3000W or 5000W) provide enhanced transient protection without degrading circuit performance. Verify that the substitute part's voltage specifications remain compatible with downstream component ratings and circuit protection thresholds.

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