1N4740AW-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4740AW-TP is a 10 V, 1 W surface mount zener diode in SOD-123 package manufactured by Micro Commercial Co. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. The part maintains ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	10 V
Power - Max	1 W
Tolerance	±5%
Impedance (Max)	7 Ohms
Current - Reverse Leakage @ Vr	10 µA @ 7.6 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA
Operating Temperature Range	-55°C ~ 150°C
Mounting Type	Surface Mount
Package / Case	SOD-123
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 1N4740AW-TP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 10 V nominal
Package type: SOD-123 or SOD-123F surface mount
RoHS3 compliance
Operating temperature range compatibility: minimum -55°C to 150°C

Secondary Compatibility Factors:

Power dissipation rating (1 W or higher)
Tolerance specification (±5% or tighter)
Impedance characteristics
Reverse leakage current specifications

Substitute parts are grouped into two categories: direct replacements with equivalent or superior electrical characteristics, and functional alternatives with reduced power ratings that remain suitable for applications not requiring full 1 W dissipation.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Power (Max)	Tolerance	Zzt (Max)	Package	Status	Temp Range
1N4740AW-TP	Micro Commercial Co	10 V	1 W	±5%	7 Ohms	SOD-123	Obsolete	-55°C ~ 150°C
DFLZ10-TP	Micro Commercial Co	10 V	1 W	±6%	4 Ohms	SOD-123F	Active	-55°C ~ 150°C
BZT52B10-E3-18	Vishay General Semiconductor	10 V	410 mW	±2%	15 Ohms	SOD-123	Active	-65°C ~ 150°C
BZT52B10-G3-08	Vishay General Semiconductor	10 V	410 mW	±2%	15 Ohms	SOD-123	Active	-65°C ~ 150°C
BZT52B10-G3-18	Vishay General Semiconductor	10 V	410 mW	±2%	15 Ohms	SOD-123	Active	-65°C ~ 150°C
BZT52C10-7-F	Diodes Incorporated	10 V	500 mW	±6%	20 Ohms	SOD-123	Active	-65°C ~ 150°C
BZT52C10-E3-08	Vishay General Semiconductor	10 V	410 mW	±5%	15 Ohms	SOD-123	Active	-55°C ~ 150°C
BZT52C10-E3-18	Vishay General Semiconductor	10 V	410 mW	±5%	15 Ohms	SOD-123	Active	-55°C ~ 150°C
BZT52C10-G3-08	Vishay General Semiconductor	10 V	410 mW	±5%	15 Ohms	SOD-123	Active	-55°C ~ 150°C
BZT52C10-G3-18	Vishay General Semiconductor	10 V	410 mW	±5%	15 Ohms	SOD-123	Active	-55°C ~ 150°C
CMHZ5240B TR PBFREE	Central Semiconductor Corp	10 V	500 mW	±5%	17 Ohms	SOD-123	Active	-65°C ~ 150°C

Engineering Selection Recommendations

Direct Replacement (Preferred):

DFLZ10-TP from Micro Commercial Co is the primary direct replacement. This part maintains the same manufacturer lineage, 1 W power rating, 10 V nominal zener voltage, and identical operating temperature range. The SOD-123F package is mechanically compatible with SOD-123 footprints. ROHS3 compliance and MSL 1 rating are maintained. The ±6% tolerance is marginally wider than the original ±5%, and impedance is improved at 4 Ohms versus 7 Ohms.

Active Alternatives with Reduced Power Rating:

The BZT52 series from Vishay General Semiconductor (BZT52B10-E3-18, BZT52B10-G3-08, BZT52B10-G3-18, BZT52C10-E3-08, BZT52C10-E3-18, BZT52C10-G3-08, BZT52C10-G3-18) and BZT52C10-7-F from Diodes Incorporated are suitable for applications where power dissipation does not exceed 410 mW to 500 mW. These parts maintain 10 V nominal zener voltage, SOD-123 package compatibility, and ROHS3 compliance. Operating temperature ranges extend to -65°C, providing enhanced low-temperature performance. Tolerance specifications range from ±2% to ±5%.

Extended Temperature Alternative:

CMHZ5240B TR PBFREE from Central Semiconductor Corp provides 500 mW power rating with ±5% tolerance and extended temperature range to -65°C. This part is suitable for applications requiring improved low-temperature performance while maintaining 10 V zener voltage and SOD-123 package compatibility.

Frequently Asked Questions (FAQ)

Q: Can BZT52 series parts with 410 mW rating replace the 1 W 1N4740AW-TP?

A: BZT52 series substitution is valid only for applications where maximum power dissipation does not exceed 410 mW. The 1N4740AW-TP is rated for 1 W continuous dissipation. Applications requiring full 1 W capability must use DFLZ10-TP, BZT52C10-7-F, or CMHZ5240B TR PBFREE.

Q: What is the difference between SOD-123 and SOD-123F packages?

A: SOD-123F is a variant of SOD-123 with improved thermal characteristics. Both packages are mechanically compatible with standard SOD-123 PCB footprints. DFLZ10-TP uses SOD-123F packaging.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant. Compliance status is maintained across all active alternatives.

Q: What tolerance specification should be selected for voltage-critical applications?

A: BZT52B10 series parts offer ±2% tolerance, providing the tightest voltage specification among available substitutes. BZT52C10 series and CMHZ5240B provide ±5% tolerance, matching the original 1N4740AW-TP specification.

Q: Does operating temperature range affect substitution suitability?

A: The 1N4740AW-TP operates from -55°C to 150°C. All substitute parts maintain the upper limit of 150°C. BZT52 series and CMHZ5240B extend the lower limit to -65°C, providing enhanced performance in low-temperature environments. Applications limited to -55°C minimum may use any listed substitute.

Q: Which substitute offers the lowest impedance?

A: DFLZ10-TP provides the lowest impedance at 4 Ohms maximum, compared to the original 7 Ohms. This characteristic improves voltage regulation performance in zener diode applications.

Q: Are packaging options limited to SOD-123?

A: All substitute parts use SOD-123 or SOD-123F surface mount packages. No through-hole alternatives are provided in this substitution list.

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