SMBJ5929A/TR13 Equivalent & Substitute Parts

Part Overview

The SMBJ5929A/TR13 is a Zener diode rated at 15 V nominal voltage with 2 W maximum power dissipation, manufactured by Microchip Technology. This surface mount component operates across the temperature range of -65°C to 150°C and is supplied in Tape & Reel packaging using the DO-214AA (SMB) package format. The part is currently in active production status with 947 units in stock.

Equivalent and substitute parts are identified when alternative manufacturers offer Zener diodes with matching or superior electrical specifications within the same package category, enabling design flexibility, supply chain optimization, and component availability management.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	15	V
Power - Maximum	2	W
Tolerance	±10%	%
Impedance (Maximum)	9	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 11.4 V
Voltage - Forward (Maximum) @ If	1.2	V @ 200 mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—

Substitute Part Grouping Explanation

Substitution eligibility for the SMBJ5929A/TR13 is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage nominal rating: 15 V
Package format: DO-214AA / SMB surface mount
Operating temperature range: -65°C to 150°C minimum
Impedance (maximum): 9 Ohms
Reverse leakage current: 1 µA @ 11.4 V

Acceptable Variation Parameters:

Power rating: Equal to or greater than 2 W
Tolerance: ±10% or tighter (±5% acceptable)
Forward voltage: Equal to or less than 1.2 V @ 200 mA

The substitute parts identified (1SMB5929B-13 and SZ1SMB5929BT3G) meet all primary matching criteria and offer enhanced power ratings (3 W) with improved voltage tolerance (±5%), making them functionally compatible and electrically superior for direct substitution in applications requiring the SMBJ5929A/TR13.

Parameter Comparison

Parameter	SMBJ5929A/TR13 (Main)	1SMB5929B-13 (Substitute)	SZ1SMB5929BT3G (Substitute)
Manufacturer	Microchip Technology	Diodes Incorporated	onsemi
Voltage - Zener (Nom)	15 V	15 V	15 V
Tolerance	±10%	±5%	±5%
Power - Max	2 W	3 W	3 W
Impedance (Max)	9 Ohms	9 Ohms	9 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 11.4 V	1 µA @ 11.4 V	1 µA @ 11.4 V
Voltage - Forward (Max) @ If	1.2 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Packaging Format	Tape & Reel (TR)	Cut Tape (CT)	Tape & Reel (TR)
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active

Engineering Selection Recommendations

SMBJ5929A/TR13 (Microchip Technology): Select this part for applications where the original design specification explicitly requires Microchip Technology components or where existing inventory and supply chain integration favor this manufacturer. This part is active in production with adequate stock availability (947 units). Note that this part carries RoHS non-compliant status.

1SMB5929B-13 (Diodes Incorporated): This substitute offers improved voltage tolerance (±5% versus ±10%) and increased power rating (3 W versus 2 W) within the same DO-214AA package footprint. The part is ROHS3 compliant and supplied in Cut Tape format. Select this option when enhanced performance specifications and RoHS compliance are required. Inventory availability is 1192 units.

SZ1SMB5929BT3G (onsemi): This substitute provides identical electrical performance to the Diodes Incorporated alternative with the additional qualification of AEC-Q101 automotive-grade certification. The part is ROHS3 compliant and supplied in Tape & Reel format, matching the packaging format of the main part. Select this option for automotive applications, high-reliability requirements, or when onsemi supply chain integration is preferred. Inventory availability is 35100 units.

All three parts share identical zener voltage, impedance, reverse leakage current, and operating temperature specifications, confirming direct functional compatibility at the circuit level.

Frequently Asked Questions (FAQ)

Q: Can the 1SMB5929B-13 or SZ1SMB5929BT3G be used as direct replacements for the SMBJ5929A/TR13?

A: Yes. Both substitute parts maintain the critical electrical parameters: 15 V zener voltage, 9 Ohms maximum impedance, 1 µA reverse leakage current, and -65°C to 150°C operating temperature range. The DO-214AA package footprint is identical across all three parts, enabling direct PCB-level substitution without layout modifications.

Q: What are the differences in power rating between the main part and substitutes?

A: The SMBJ5929A/TR13 is rated at 2 W maximum power dissipation. Both substitute parts (1SMB5929B-13 and SZ1SMB5929BT3G) are rated at 3 W maximum power dissipation. The higher power rating of the substitutes provides additional thermal margin and is fully compatible with applications designed for the 2 W specification.

Q: How do the voltage tolerances differ?

A: The SMBJ5929A/TR13 carries a ±10% tolerance on the 15 V zener voltage. Both substitute parts carry a ±5% tolerance, representing a tighter specification. This improved tolerance provides more precise voltage regulation and is backward-compatible with designs accepting ±10% tolerance.

Q: What is the significance of the AEC-Q101 qualification on the SZ1SMB5929BT3G?

A: AEC-Q101 is an automotive-grade qualification standard. The SZ1SMB5929BT3G meets this qualification, making it suitable for automotive and high-reliability applications. The other two parts do not carry this certification.

Q: Are there RoHS compliance differences?

A: Yes. The SMBJ5929A/TR13 is RoHS non-compliant. Both substitute parts (1SMB5929B-13 and SZ1SMB5929BT3G) are ROHS3 compliant. For applications requiring RoHS compliance, either substitute part is required.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape wound on reels, suitable for high-volume automated assembly. Cut Tape (CT) packaging supplies components on tape segments, suitable for lower-volume or manual assembly operations. The SMBJ5929A/TR13 and SZ1SMB5929BT3G use Tape & Reel format; the 1SMB5929B-13 uses Cut Tape format. The electrical and mechanical specifications are identical; packaging format selection depends on assembly process requirements.

Q: Can forward voltage differences affect circuit performance?

A: The SMBJ5929A/TR13 specifies 1.2 V maximum forward voltage at 200 mA. Both substitutes specify 1.5 V maximum forward voltage at the same current. This 0.3 V difference is within typical circuit design margins for zener diode applications and does not prevent substitution. Forward voltage characteristics are secondary to zener voltage regulation in typical applications.

Q: Which substitute part should be selected for new designs?

A: For new designs without existing supply chain constraints, the SZ1SMB5929BT3G offers the most comprehensive specification set: AEC-Q101 automotive qualification, ROHS3 compliance, 3 W power rating, ±5% tolerance, and highest inventory availability (35100 units). For cost-sensitive applications without automotive requirements, the 1SMB5929B-13 provides equivalent electrical performance with ROHS3 compliance at potentially lower cost.

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