SMAJ8.5CA-TP Equivalent & Substitute Parts

Part Overview

The SMAJ8.5CA-TP is a transient voltage suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode operates with an 8.5V reverse standoff voltage and provides 14.4V maximum clamping voltage at peak pulse current of 27.7A. The component is housed in a DO-214AC (SMA) package and is ROHS3 compliant with unlimited moisture sensitivity rating.

Substitute parts are necessary when the primary part becomes unavailable, when alternative manufacturers offer equivalent electrical performance, or when design flexibility requires component sourcing from multiple suppliers while maintaining circuit protection specifications.

Substiute Parts

SMAJ8.5CA-TP

Micro Commercial CoIn Stock: 6070SMAJ8.5CA-TP Datasheet

Current PartRFQ

SMAJ8.5CA

MDDIn Stock: 72471SMAJ8.5CA Datasheet

DirectRFQ

SMAJ8.5CA

MDDIn Stock: 72471SMAJ8.5CA Datasheet

DirectRFQ

SMAJ8.5CA-13-F

Diodes IncorporatedIn Stock: 130280SMAJ8.5CA-13-F Datasheet

DirectRFQ

SMA6J8.5CA-TR

STMicroelectronicsIn Stock: 3797SMA6J8.5CA-TR Datasheet

SimilarRFQ

SMAJ8.5CA-13

Diodes IncorporatedIn Stock: 1127SMAJ8.5CA-13 Datasheet

SimilarRFQ

SMAJ8.5CA-TR

STMicroelectronicsIn Stock: 6298SMAJ8.5CA-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMAJ8.5CA-TP is determined by the following critical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 8.5V
• Voltage - Clamping (Max) @ Ipp: 14.4V
• Current - Peak Pulse (10/1000µs): 27.7A (±0.1A tolerance acceptable)
• Package / Case: DO-214AC, SMA
• Type: Zener, Bidirectional
• Mounting Type: Surface Mount

Compliance Requirements:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level: 1 (Unlimited)
• Product Status: Active

Parts are grouped into two categories:

Direct Equivalents: Parts with identical electrical specifications (voltage, current, power ratings) and active product status. These parts are interchangeable without circuit redesign.

Similar Parts: Parts with the same reverse standoff voltage (8.5V) but different clamping voltages or peak pulse currents. These require circuit evaluation before substitution.

Discontinued Parts: Parts meeting electrical specifications but with discontinued or non-compliant status. These are not recommended for new designs.

Parameter Comparison

Engineering Selection Recommendations

Recommended Direct Substitutes:

SMAJ8.5CA (MDD) and SMAJ8.5CA-13-F (Diodes Incorporated) are the primary alternatives to SMAJ8.5CA-TP. Both maintain identical clamping voltage (14.4V) and equivalent peak pulse current specifications. SMAJ8.5CA-13-F offers the closest thermal performance match with operating temperature range of -55°C ~ 150°C. Both parts are ROHS3 compliant and carry active product status, making them suitable for new designs and production environments.

Alternative Consideration:

SMAJ8.5CA (MDD) provides equivalent electrical performance with a slightly higher peak pulse current rating (27.8A vs 27.7A). The operating temperature range is narrower (-50°C ~ 150°C vs -55°C ~ 175°C), which may require thermal evaluation in extreme cold environments.

Not Recommended for Direct Substitution:

SMA6J8.5CA-TR and SMAJ8.5CA-TR (STMicroelectronics) exhibit higher clamping voltages (18.7V and 19.5V respectively) and different peak pulse current specifications. These parts are suitable only when circuit design permits higher clamping voltage tolerance.

SMAJ8.5CA-13 (Diodes Incorporated) is discontinued and RoHS non-compliant, making it unsuitable for new designs and restricted supply environments.

Frequently Asked Questions (FAQ)

Q: Can SMAJ8.5CA-13-F replace SMAJ8.5CA-TP directly in production?

A: Yes. SMAJ8.5CA-13-F meets all critical electrical parameters: 8.5V reverse standoff voltage, 14.4V clamping voltage, and 27.7A peak pulse current. Both are ROHS3 compliant and active products. The only consideration is the operating temperature range, which is -55°C ~ 150°C (TJ) versus -55°C ~ 175°C (TA) for the original part. Verify your application's maximum junction temperature requirement.

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

A: Both parts share identical electrical specifications (8.5V standoff, 14.4V clamping, 27.7A peak pulse current) and DO-214AC SMA packaging. The primary difference is the operating temperature range: SMAJ8.5CA operates -50°C ~ 150°C while SMAJ8.5CA-TP operates -55°C ~ 175°C. Select SMAJ8.5CA only if your application does not require operation below -50°C or above 150°C.

Q: Why are SMA6J8.5CA-TR and SMAJ8.5CA-TR listed as similar but not direct substitutes?

A: These STMicroelectronics parts maintain the same 8.5V reverse standoff voltage but feature higher clamping voltages (18.7V and 19.5V respectively) and significantly higher peak pulse current ratings. Higher clamping voltage means greater voltage stress on protected circuits. Substitution requires circuit redesign and validation to confirm the higher clamping voltage is acceptable for your application.

Q: Is SMAJ8.5CA-13 available for new designs?

A: No. SMAJ8.5CA-13 is discontinued at DiGi Electronics and RoHS non-compliant. Use SMAJ8.5CA-13-F instead, which is the active, compliant equivalent from the same manufacturer.

Q: Do all substitute parts use the same DO-214AC SMA package?

A: Yes. All listed parts use DO-214AC (SMA) surface-mount packaging, ensuring mechanical and footprint compatibility on PCBs designed for SMAJ8.5CA-TP.

Q: What compliance certifications apply to recommended substitutes?

A: SMAJ8.5CA (MDD) and SMAJ8.5CA-13-F (Diodes Incorporated) are both ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1), matching the original SMAJ8.5CA-TP specifications. Both carry EAR99 export classification and REACH unaffected status.