CD214A-T8.5ALF Equivalent & Substitute Parts

Part Overview

The CD214A-T8.5ALF is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Bourns Inc., rated for 8.5V reverse standoff voltage with 14.4V maximum clamping voltage at peak pulse current. Designed for general-purpose transient protection in surface mount DO-214AC (SMA) packaging, this component is currently obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure continued availability for production and repair applications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	8.5	V
Voltage - Breakdown (Min)	9.44	V
Voltage - Clamping (Max) @ Ipp	14.4	V
Current - Peak Pulse (10/1000µs)	27.7	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 150	°C
Package / Case	DO-214AC (SMA)	—
Type	Zener	—
Unidirectional Channels	1	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the CD214A-T8.5ALF is determined by matching the following critical electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 8.5V
Voltage - Clamping (Max) @ Ipp: 14.4V
Current - Peak Pulse (10/1000µs): 27.7A (±tolerance)
Power - Peak Pulse: 400W
Package / Case: DO-214AC (SMA)
Type: Zener, Unidirectional
Operating Temperature Range: -55°C minimum to 150°C minimum

Substitute parts are classified into two categories:

Direct Equivalents: Parts with identical electrical specifications and matching clamping voltage, peak pulse current, and power rating.

Similar Alternatives: Parts with the same reverse standoff voltage and package but variations in clamping voltage, peak pulse current, or power rating within acceptable design margins. These require circuit-level validation to confirm compatibility.

Parameter Comparison

Part Number	Manufacturer	VWM (V)	Vc (V)	Ipp (A)	Power (W)	Temp Range (°C)	Package	Status
CD214A-T8.5ALF	Bourns Inc.	8.5	14.4	27.7	400	-55 to 150	DO-214AC (SMA)	Obsolete
SMAJ8.5A	Meritek	8.5	14.4	27.78	400	-55 to 150	DO-214AC (SMA)	Active
SMAJ8.5A-TP	Micro Commercial Co	8.5	14.4	27.7	400	-55 to 175	DO-214AC (SMA)	Active
TV04A8V5J-G	Comchip Technology	8.5	14.4	27.78	400	-55 to 150	DO-214AC (SMA)	Active
P4SMA10A	Eaton - Electronics Division	8.55	14.5	28.3	400	-55 to 150	DO-214AC (SMA)	Active
SM4T10AY	STMicroelectronics	8.5	19.5	124 (8/20µs)	400	-55 to 150	DO-214AC (SMA)	Active
SMA6J8.5A-TR	STMicroelectronics	8.5	18.7	205 (8/20µs)	600	-55 to 175	DO-214AC (SMA)	Active
SMAJ8.0A-M3/5A	Vishay General Semiconductor - Diodes Division	8.0	13.6	29.4	400	-55 to 150	DO-214AC (SMA)	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

SMAJ8.5A (Meritek), SMAJ8.5A-TP (Micro Commercial Co), and TV04A8V5J-G (Comchip Technology) are direct functional equivalents with matching reverse standoff voltage (8.5V), clamping voltage (14.4V), and peak pulse current specifications. All three are RoHS3 compliant and rated for the same operating temperature minimum (-55°C). SMAJ8.5A-TP offers extended upper temperature rating to 175°C, providing additional thermal margin. These parts are recommended as first-choice replacements due to electrical parameter alignment and active product status.

Secondary Alternatives (Similar Parameters):

P4SMA10A (Eaton) presents minimal deviation with 8.55V standoff voltage and 14.5V clamping voltage, representing less than 1% variance from the original specification. Peak pulse current of 28.3A is within acceptable tolerance. This part is suitable for applications where slight parameter variation is acceptable.

SM4T10AY (STMicroelectronics) and SMA6J8.5A-TR (STMicroelectronics) share the 8.5V standoff voltage but feature elevated clamping voltages (19.5V and 18.7V respectively) and significantly higher peak pulse current ratings. These are suitable only for applications where higher clamping voltage and enhanced transient energy absorption are beneficial or tolerable. SMA6J8.5A-TR additionally provides 600W peak pulse power and extended temperature range to 175°C.

Not Recommended:

SMAJ8.0A-M3/5A (Vishay) operates at 8.0V standoff voltage with 13.6V clamping voltage, representing a 0.5V reduction in standoff voltage and 0.8V reduction in clamping voltage. This part is suitable only for applications with lower voltage thresholds and should not be used as a direct replacement without circuit validation.

All recommended substitutes maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage practices.

Frequently Asked Questions (FAQ)

Q: Can SMAJ8.5A directly replace CD214A-T8.5ALF without circuit modification?

A: Yes. SMAJ8.5A matches all critical electrical parameters: 8.5V reverse standoff voltage, 14.4V clamping voltage, 27.78A peak pulse current, and 400W power rating. Both use DO-214AC (SMA) packaging. The part is RoHS3 compliant and rated for -55°C to 150°C operation, meeting the original specification.

Q: What is the difference between SMAJ8.5A-TP and SMAJ8.5A?

A: Both parts are electrically identical with matching voltage and current ratings. The primary difference is operating temperature range: SMAJ8.5A-TP is rated to 175°C (upper limit) compared to 150°C for SMAJ8.5A. SMAJ8.5A-TP is manufactured by Micro Commercial Co, while SMAJ8.5A is from Meritek. Select SMAJ8.5A-TP for applications requiring extended thermal performance.

Q: Why do SM4T10AY and SMA6J8.5A-TR have higher clamping voltages?

A: These parts are designed for higher transient energy absorption with clamping voltages of 19.5V and 18.7V respectively, compared to 14.4V in the original. They are suitable for applications requiring greater overvoltage protection margin or where circuit design permits higher clamping voltage. Use only if your application can tolerate the elevated clamping voltage without affecting downstream components.

Q: Are all substitute parts available in the same packaging?

A: Yes. All listed substitutes use DO-214AC (SMA) surface mount packaging, ensuring mechanical and footprint compatibility with the original CD214A-T8.5ALF design.

Q: What does RoHS3 compliance mean for component selection?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. All recommended substitutes are RoHS3 compliant, ensuring compatibility with modern manufacturing standards and regulatory requirements.

Q: Can SMAJ8.0A-M3/5A be used as a substitute?

A: SMAJ8.0A-M3/5A operates at 8.0V standoff voltage with 13.6V clamping voltage, representing a 0.5V reduction in standoff and 0.8V reduction in clamping voltage. This part is not recommended as a direct replacement. Use only if circuit analysis confirms that lower voltage thresholds are acceptable for your application.

Q: What is the significance of peak pulse current measurement standards (10/1000µs vs 8/20µs)?

A: Different measurement standards apply to different part families. The original CD214A-T8.5ALF and most direct substitutes use 10/1000µs pulse measurement. STMicroelectronics parts (SM4T10AY, SMA6J8.5A-TR) use 8/20µs measurement, which typically results in higher reported current values for the same energy absorption capability. Ensure your circuit design accounts for the applicable measurement standard when selecting parts.

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