SMDJ8.5C Equivalent & Substitute Parts

Part Overview

The SMDJ8.5C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This part operates with an 8.5V reverse standoff voltage and provides 15.12V maximum clamping voltage at peak pulse current of 208.3A, delivering 3000W peak pulse power dissipation in a DO-214AB (SMC) package. The SMDJ8.5C is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Reverse Standoff Voltage (Typ)	8.5	V
Breakdown Voltage (Min)	8.93	V
Clamping Voltage (Max) @ Ipp	15.12	V
Peak Pulse Current (10/1000µs)	208.3	A
Peak Pulse Power	3000	W
Bidirectional Channels	1	—
Package / Case	DO-214AB, SMC	—
Operating Temperature Range	-65 to 150	°C (TJ)
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMDJ8.5C is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Reverse standoff voltage: 8.5V (±tolerance)
Clamping voltage range: 13.6V to 15.12V maximum
Peak pulse current capability: minimum 103A (lower ratings acceptable for reduced power applications)
Peak pulse power: 1500W minimum (3000W preferred for direct replacement)
Package type: DO-214AB / SMC surface mount
Bidirectional channels: 1
Type: Zener TVS diode

Secondary Compatibility Factors:

Operating temperature range: -55°C to 150°C minimum
RoHS3 compliance required
Moisture sensitivity level: 1 (Unlimited) preferred

Parts are grouped into two categories: Direct Replacements (matching 3000W power rating and 208A+ peak current) and Functional Equivalents (meeting voltage and package requirements with reduced power ratings of 1500W).

Parameter Comparison

Part Number	Manufacturer	Vwm (V)	Vc Max (V)	Ipp (A)	Power (W)	Temp Range (°C)	Status
SMDJ8.5C	Littelfuse Inc.	8.5	15.12	208.3	3000	-65 to 150	Obsolete
SMDJ8.5CA	Alpha & Omega Semiconductor Inc.	8.5	14.4	208.4	3000	-55 to 150	Active
1.5SMC10CA-E3/57T	Vishay General Semiconductor	8.55	14.5	103	1500	-65 to 150	Active
SMCJ11CA-13-F	Diodes Incorporated	11	18.2	82.4	1500	-55 to 150	Active
SMCJ8.5CA	Taiwan Semiconductor Corporation	8.5	14.4	109	1500	-55 to 150	Active
SMCJ8.5CA-TP	Micro Commercial Co	8.5	14.4	104.2	1500	-55 to 175	Active
SMCJ8.5CAE3/TR13	Microchip Technology	8.5	13.6	110.3	1500	-65 to 150	Active
SMCJ8V5CA	Fairchild Semiconductor	8.5	14.4	104.2	1500	—	Active
SMLJ8.5CA	Bourns Inc.	8.5	14.4	208.4	3000	-55 to 150	Active
SMLJ8.5CA-TP	Micro Commercial Co	8.5	14.4	208.4	3000	-55 to 175	Active
SMLJ8.5CAE3/TR13	Microchip Technology	8.5	14.4	208.4	300	-55 to 150	Active

Engineering Selection Recommendations

Tier 1 — Direct Replacements (Preferred)

SMDJ8.5CA (Alpha & Omega Semiconductor Inc.) and SMLJ8.5CA (Bourns Inc.) are the primary direct replacements. Both maintain the 3000W peak pulse power rating and 208A+ peak current specification of the original SMDJ8.5C. SMDJ8.5CA is available in higher inventory (12,200 pcs) and is actively produced. SMLJ8.5CA offers equivalent electrical performance with 925 pcs in stock. Both are RoHS3 compliant and operate within the required temperature range.

SMLJ8.5CA-TP (Micro Commercial Co) provides identical electrical specifications with extended operating temperature range (-55°C to 175°C) and 9,100 pcs inventory availability. This option is suitable for applications requiring higher temperature operation.

Tier 2 — Functional Equivalents (Reduced Power Applications)

SMCJ8.5CA (Taiwan Semiconductor Corporation), SMCJ8.5CA-TP (Micro Commercial Co), and SMCJ8.5CAE3/TR13 (Microchip Technology) meet the 8.5V standoff voltage and DO-214AB package requirements with 1500W peak pulse power ratings. These parts are suitable for applications where peak pulse power does not exceed 1500W. SMCJ8.5CA offers the highest inventory (15,200 pcs). SMCJ8.5CAE3/TR13 maintains the -65°C lower temperature limit of the original part.

Tier 3 — Voltage-Shifted Alternatives

1.5SMC10CA-E3/57T (Vishay General Semiconductor) operates at 8.55V standoff voltage with 1500W power rating and 103A peak current. This part is suitable only for applications tolerating the slightly higher clamping voltage (14.5V) and reduced current capability.

SMCJ11CA-13-F (Diodes Incorporated) operates at 11V standoff voltage and is not recommended as a direct substitute due to the significant voltage shift, which may affect circuit protection thresholds.

Compliance and Availability

All recommended substitutes maintain RoHS3 compliance. Parts with REACH Unaffected status (SMDJ8.5CA, SMCJ8.5CA, SMCJ8.5CA-TP, SMCJ8.5CAE3/TR13, SMLJ8.5CA-TP, SMLJ8.5CAE3/TR13) are preferred for supply chain stability. SMLJ8.5CA carries REACH Affected status and requires verification for specific applications.

Frequently Asked Questions (FAQ)

Q: Can SMCJ8.5CA replace SMDJ8.5C directly?

A: SMCJ8.5CA is electrically compatible with matching 8.5V standoff voltage and DO-214AB package. However, it provides 1500W peak pulse power versus the original 3000W rating. Direct substitution is acceptable only if the application's transient energy does not exceed 1500W. For applications requiring full 3000W capability, use SMDJ8.5CA or SMLJ8.5CA instead.

Q: What is the difference between SMDJ and SMCJ series?

A: Both SMDJ and SMCJ series are bidirectional TVS diodes in DO-214AB (SMC) packages with identical electrical specifications for the 8.5V rating. The series designation reflects different manufacturer product lines. Electrical performance and package compatibility are equivalent.

Q: Why does SMCJ11CA-13-F have a different voltage rating?

A: SMCJ11CA-13-F operates at 11V standoff voltage, which is outside the 8.5V specification of the SMDJ8.5C. This part is not suitable as a substitute because it will not provide protection at the same voltage threshold, potentially allowing higher transient voltages to reach protected circuitry.

Q: Is the SMLJ8.5CAE3/TR13 a valid substitute despite the 300W power rating discrepancy?

A: The SMLJ8.5CAE3/TR13 specification shows 300W peak pulse power, which is significantly lower than the original 3000W rating. This part is not recommended as a direct substitute for applications requiring full power dissipation capability. Verify actual datasheet specifications before selection.

Q: What packaging options are available for substitutes?

A: All substitute parts are available in DO-214AB (SMC) surface-mount package, matching the original SMDJ8.5C. Packaging options include Tape & Reel (TR) for automated assembly and Bulk for manual handling. Select based on assembly process requirements.

Q: Are there temperature range considerations for substitute selection?

A: The original SMDJ8.5C operates from -65°C to 150°C. Most substitutes operate from -55°C to 150°C, which is acceptable for most applications. SMCJ8.5CAE3/TR13 and SMLJ8.5CAE3/TR13 maintain the -65°C lower limit. SMCJ8.5CA-TP and SMLJ8.5CA-TP extend to 175°C for high-temperature applications.

Q: Which substitute offers the best inventory availability?

A: SMCJ8V5CA (Fairchild Semiconductor) has the highest inventory at 30,100 pcs, followed by SMCJ8.5CA (Taiwan Semiconductor Corporation) at 15,200 pcs. For 3000W power rating, SMDJ8.5CA (12,200 pcs) and SMLJ8.5CA-TP (9,100 pcs) are the best-stocked options.

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