SMAJ4740A-TP Equivalent & Substitute Parts

Part Overview

The SMAJ4740A-TP is a surface mount Zener diode manufactured by Micro Commercial Co, rated at 10 V nominal voltage with 1 W maximum power dissipation in a DO-214AC (SMA) package. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	10	V
Tolerance	±5%	—
Power - Max	1	W
Impedance (Max)	7	Ohms
Current - Reverse Leakage @ Vr	10	µA @ 7.6 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 100 mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMAJ4740A-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nom): 10 V (exact match required)
Package / Case: DO-214AC or SMA (mechanical compatibility)
Mounting Type: Surface Mount (assembly compatibility)
Operating Temperature Range: -65°C to 150°C minimum (thermal envelope)
RoHS3 Compliance: Required for regulatory alignment

Secondary Compatibility Parameters:

Power - Max: 1 W (full-power equivalents) or 500 mW (reduced-power alternatives)
Tolerance: ±5% (preferred) or ±10% (acceptable with design verification)
Impedance (Max): 7 Ohms (primary) or 4–5 Ohms (improved performance)
Current - Reverse Leakage: 10 µA or lower (acceptable)
Voltage - Forward (Vf): 1.2–1.5 V @ 100–200 mA (acceptable range)

Substitute parts are classified as Direct (full electrical and mechanical equivalence) or Similar (acceptable parameter variations within design tolerance).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range	Package	RoHS3
SMAJ4740A-TP	Micro Commercial Co	10 V	±5%	1 W	7 Ω	10 µA @ 7.6 V	1.2 V @ 100 mA	-65 to 150°C	DO-214AC (SMA)	Yes
SMAZ10-TP	Micro Commercial Co	10 V	±5%	1 W	4 Ω	1 µA @ 7.6 V	1.2 V @ 200 mA	-65 to 150°C	DO-214AC (SMAJ)	Yes
SMAZ10-13-F	Diodes Incorporated	10 V	±5%	1 W	4 Ω	1 µA @ 7.6 V	1.2 V @ 200 mA	-65 to 150°C	DO-214AC (SMA)	Yes
CMZ5925B TR13 PBFREE	Central Semiconductor Corp	10 V	±5%	500 mW	4.5 Ω	5 µA @ 8 V	1.5 V @ 200 mA	-65 to 150°C	DO-214AC (SMA)	Yes
SMAZ5925B-E3/61	Vishay General Semiconductor - Diodes Division	10 V	±5%	500 mW	5 Ω	10 µA @ 8 V	1.5 V @ 200 mA	-65 to 150°C	DO-214AC (SMA)	Yes
SML4740-E3/5A	Vishay General Semiconductor - Diodes Division	10 V	±10%	1 W	7 Ω	10 µA @ 7.6 V	Not specified	-65 to 150°C	DO-214AC (SMA)	Yes
SML4740-E3/61	Vishay General Semiconductor - Diodes Division	10 V	±10%	1 W	7 Ω	10 µA @ 7.6 V	Not specified	-65 to 150°C	DO-214AC (SMA)	Yes

Engineering Selection Recommendations

Direct Substitutes (Full Equivalence):

SMAZ10-TP and SMAZ10-13-F are direct substitutes for SMAJ4740A-TP. Both maintain 10 V nominal voltage, ±5% tolerance, 1 W power rating, and -65°C to 150°C operating temperature. Both are RoHS3 compliant and packaged in DO-214AC (SMA). SMAZ10-TP is manufactured by Micro Commercial Co (same manufacturer as the primary part). SMAZ10-13-F is manufactured by Diodes Incorporated. These parts demonstrate improved reverse leakage characteristics (1 µA versus 10 µA) and lower impedance (4 Ω versus 7 Ω), representing enhanced performance within the same electrical class.

Similar Substitutes (Acceptable Variations):

CMZ5925B TR13 PBFREE and SMAZ5925B-E3/61 are similar substitutes with reduced power rating (500 mW versus 1 W). These parts maintain 10 V nominal voltage, ±5% tolerance, and full operating temperature range. Both are RoHS3 compliant. CMZ5925B TR13 PBFREE is manufactured by Central Semiconductor Corp; SMAZ5925B-E3/61 is manufactured by Vishay General Semiconductor - Diodes Division. These parts are suitable for applications where 500 mW power dissipation is sufficient.

SML4740-E3/5A and SML4740-E3/61 are similar substitutes manufactured by Vishay General Semiconductor - Diodes Division. Both maintain 10 V nominal voltage, 1 W power rating, and full operating temperature range. Tolerance is ±10% (versus ±5% for the primary part). Both are RoHS3 compliant. These parts are suitable for applications where ±10% voltage tolerance is acceptable.

All substitute parts are Active product status and RoHS3 compliant, meeting current regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can SMAZ10-TP be used as a direct replacement for SMAJ4740A-TP?

A: Yes. SMAZ10-TP is a direct substitute. Both parts share identical nominal voltage (10 V), tolerance (±5%), power rating (1 W), operating temperature range (-65°C to 150°C), and package type (DO-214AC, SMA). SMAZ10-TP demonstrates superior performance with lower reverse leakage (1 µA versus 10 µA) and lower impedance (4 Ω versus 7 Ω).

Q: What is the difference between SMAZ10-TP and SMAZ10-13-F?

A: Both parts are direct substitutes with identical electrical specifications: 10 V nominal voltage, ±5% tolerance, 1 W power rating, and -65°C to 150°C operating temperature. The primary difference is manufacturer: SMAZ10-TP is manufactured by Micro Commercial Co, while SMAZ10-13-F is manufactured by Diodes Incorporated. Both are RoHS3 compliant.

Q: Can I use CMZ5925B TR13 PBFREE in place of SMAJ4740A-TP?

A: CMZ5925B TR13 PBFREE is a similar substitute with reduced power rating (500 mW versus 1 W). It maintains 10 V nominal voltage, ±5% tolerance, and full operating temperature range. This part is suitable only if the application requires 500 mW or less power dissipation. Verify thermal and electrical requirements before substitution.

Q: What does the ±10% tolerance on SML4740-E3/5A and SML4740-E3/61 mean for circuit design?

A: The ±10% tolerance indicates that the actual Zener voltage may vary between 9 V and 11 V, compared to ±5% tolerance (9.5 V to 10.5 V) on the primary part. These parts are suitable for applications where ±10% voltage variation is acceptable. Verify circuit performance across this wider tolerance band before substitution.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant, matching the compliance status of SMAJ4740A-TP.

Q: What is the significance of lower impedance (4 Ω) in SMAZ10-TP compared to the primary part (7 Ω)?

A: Lower impedance indicates improved dynamic response and reduced voltage variation under load changes. SMAZ10-TP with 4 Ω impedance provides tighter voltage regulation compared to SMAJ4740A-TP with 7 Ω impedance. This represents enhanced performance within the same electrical class.

Q: Can I mix different substitute parts in the same circuit board?

A: All listed substitute parts are electrically compatible within their specified parameter ranges. However, design consistency and supply chain management typically favor using a single part number per design. Verify that mixed parts meet circuit performance requirements across all specified operating conditions.

Q: What is the difference between DO-214AC and SMA package designations?

A: DO-214AC and SMA are equivalent package designations for the same physical form factor. Both refer to the same surface mount package used by these Zener diodes. The designations are interchangeable for mechanical and electrical compatibility purposes.

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