SMDJ11 Equivalent & Substitute Parts

Part Overview

The SMDJ11 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features an 11V reverse standoff voltage with a 19.11V maximum clamping voltage and 164.8A peak pulse current capability in a DO-214AB (SMC) package. The SMDJ11 is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	11	V
Voltage - Breakdown (Min)	11.57	V
Voltage - Clamping (Max) @ Ipp	19.11	V
Current - Peak Pulse (10/1000µs)	164.8	A
Power - Peak Pulse	3000	W
Type	Zener	—
Unidirectional Channels	1	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature Range	-65 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMDJ11 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Voltage - Reverse Standoff (Typ): 11V
Unidirectional Channels: 1
Package / Case: DO-214AB, SMC
Type: Zener
Mounting Type: Surface Mount

Allowable Variation Parameters:

Voltage - Clamping (Max) @ Ipp: 18.2V to 19.11V (substitute parts cluster at 18.2V, within acceptable suppression performance)
Current - Peak Pulse (10/1000µs): 82.4A to 164.9A (two distinct current classes identified)
Power - Peak Pulse: 1500W or 3000W (correlates with current rating)
Operating Temperature Range: -55°C to 175°C (all substitutes meet or exceed minimum -55°C requirement)

Substitute parts are grouped into two categories based on peak pulse current capability: 3000W class (164.8A–164.9A) and 1500W class (82.4A–82.5A). Selection depends on circuit requirements for transient energy dissipation.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Product Status	Package
SMDJ11	Littelfuse Inc.	11	11.57	19.11	164.8	3000	-65 to 150	Obsolete	DO-214AB
SMDJ11A	Alpha & Omega Semiconductor Inc.	11	12.2	18.2	164.9	3000	-55 to 150	Active	DO-214AB
SMCJ11A	Fairchild Semiconductor	11	12.2	18.2	82.5	1500	-55 to 150	Active	DO-214AB
SMCJ11A-TP	Micro Commercial Co	11	12.2	18.2	82.5	1500	-55 to 175	Active	DO-214AB
SMCJ11AE3/TR13	Microchip Technology	11	12.2	18.2	82.4	1500	-65 to 150	Active	DO-214AB
SMLJ11A	Bourns Inc.	11	12.2	18.2	164.8	3000	-55 to 150	Active	DO-214AB
SMLJ11A-TP	Micro Commercial Co	11	12.2	18.2	164.8	3000	-55 to 175	Active	DO-214AB
TV15C110J-G	Comchip Technology	11	12.2	18.2	82.42	1500	-55 to 150	Active	DO-214AB
TV15C110J-HF	Comchip Technology	11	12.2	18.2	82.42	1500	-55 to 150	Active	DO-214AB
TV30C110J-G	Comchip Technology	11	12.2	18.2	164.84	3000	-55 to 150	Active	DO-214AB

Engineering Selection Recommendations

Direct Replacement (3000W Class - Highest Compatibility):

SMDJ11A, SMLJ11A, SMLJ11A-TP, and TV30C110J-G are direct functional replacements for the SMDJ11. These parts maintain the 3000W peak pulse power rating and 164.8A–164.9A peak pulse current, matching the original design intent. All are active products with ROHS3 compliance. SMDJ11A from Alpha & Omega Semiconductor Inc. offers the closest electrical match with 164.9A peak pulse current. SMLJ11A and SMLJ11A-TP from Bourns Inc. and Micro Commercial Co respectively provide equivalent performance with extended temperature ranges (SMLJ11A-TP to 175°C).

Alternative Replacement (1500W Class - Reduced Power Dissipation):

SMCJ11A, SMCJ11A-TP, SMCJ11AE3/TR13, TV15C110J-G, and TV15C110J-HF are suitable substitutes where circuit design permits reduced peak pulse power handling (1500W vs. 3000W). These parts maintain the 11V reverse standoff voltage and DO-214AB package but operate at 82.4A–82.5A peak pulse current. Selection from this group depends on temperature range requirements and packaging format (bulk vs. tape & reel).

Temperature Considerations:

For applications requiring extended low-temperature operation below -55°C, SMCJ11AE3/TR13 (Microchip Technology, -65°C minimum) and the original SMDJ11 specification (-65°C minimum) are applicable. For high-temperature applications exceeding 150°C, SMCJ11A-TP and SMLJ11A-TP both support -55°C to 175°C operation.

Compliance and Availability:

All substitute parts are ROHS3 compliant. SMLJ11A carries REACH Affected status; all others are REACH Unaffected or REACH Compliant. Inventory availability ranges from 792 to 15,100 units across suppliers, with SMLJ11A offering the highest stock position (15,100 units).

Frequently Asked Questions (FAQ)

Q: Can I use a 1500W substitute part (SMCJ11A series) in place of the SMDJ11?

A: Yes, if your circuit design does not require the full 3000W peak pulse power dissipation capability. The 1500W class parts maintain identical 11V reverse standoff voltage, 18.2V clamping voltage, and DO-214AB package compatibility. Verify that transient energy levels in your application do not exceed 1500W; if they do, use a 3000W class substitute (SMDJ11A, SMLJ11A, or TV30C110J-G).

Q: What is the difference between SMDJ11A and SMLJ11A?

A: Both are 3000W class substitutes with 164.8A–164.9A peak pulse current and 11V reverse standoff voltage. SMDJ11A is manufactured by Alpha & Omega Semiconductor Inc. with -55°C to 150°C operating range. SMLJ11A is manufactured by Bourns Inc. with identical temperature range but higher inventory availability (15,100 units). Electrical performance is equivalent; selection may depend on supplier preference or lead time.

Q: Are all substitute parts available in tape & reel packaging?

A: No. SMCJ11A (Fairchild Semiconductor) is supplied in bulk packaging. SMDJ11A, SMCJ11A-TP, SMCJ11AE3/TR13, SMLJ11A, SMLJ11A-TP, TV15C110J-G, TV15C110J-HF, and TV30C110J-G are available in tape & reel format. Verify packaging requirements with your procurement process before selection.

Q: Does the clamping voltage difference (19.11V original vs. 18.2V substitutes) affect circuit performance?

A: The clamping voltage difference of 0.91V is within normal manufacturing tolerance for TVS diodes and does not affect functional compatibility. Both values suppress transient overvoltage to safe levels for protected circuitry. The 18.2V clamping voltage of substitute parts is a standard specification across multiple manufacturers for 11V standoff devices.

Q: Which substitute should I choose for high-temperature applications?

A: For operating temperatures up to 175°C, select SMCJ11A-TP or SMLJ11A-TP. Both support -55°C to 175°C operation. SMCJ11A-TP is a 1500W class device; SMLJ11A-TP is a 3000W class device. Choose based on your circuit's peak pulse power requirement.

Q: Is the SMDJ11 truly obsolete, or can I still source it?

A: The SMDJ11 is classified as obsolete by Littelfuse Inc. However, 716 units remain in stock as new original inventory. For new designs or long-term production, transition to an active substitute part. SMDJ11A, SMLJ11A, or TV30C110J-G are recommended direct replacements.

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