1N4739AW-TP Equivalent & Substitute Parts

Part Overview

The 1N4739AW-TP is a Zener diode rated at 9.1 V nominal voltage with 1 W maximum power dissipation in a surface mount SOD-123 package. Manufactured by Micro Commercial Co, this component is classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute components maintain the core electrical specifications while offering improved availability and active product support.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	9.1	V
Tolerance	±5%	—
Power - Max	1	W
Impedance (Max)	5	Ohms
Current - Reverse Leakage @ Vr	10	µA @ 7 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
Operating Temperature	-55 to 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 1N4739AW-TP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 9.1 V nominal
Operating temperature range: -55°C to 150°C minimum
Surface mount technology
RoHS3 compliance
Moisture sensitivity level 1

Secondary Compatibility Factors:

Power dissipation capacity (1 W or greater)
Voltage tolerance (±5% or tighter)
Package compatibility (SOD-123 or equivalent footprint)
Impedance characteristics (5 Ohms or lower preferred)

Substitute parts are grouped into two categories: direct replacements with identical or superior electrical performance in the same package, and functional equivalents with different package options that maintain electrical specifications within acceptable parameters.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (W/mW)	Zzt (Ohms)	Package	Status
1N4739AW-TP	Micro Commercial Co	9.1	±5%	1 W	5	SOD-123	Obsolete
DFLZ9V1-TP	Micro Commercial Co	9.1	±5%	1 W	4	SOD-123F	Active
BZT52B9V1-G3-08	Vishay General Semiconductor	9.1	±2%	410 mW	10	SOD-123	Active
BZT52B9V1-G3-18	Vishay General Semiconductor	9.1	±2%	410 mW	10	SOD-123	Active
BZT52C9V1-13-F	Diodes Incorporated	9.1	±6%	500 mW	15	SOD-123	Active
BZT52C9V1-7-F	Diodes Incorporated	9.1	±6%	500 mW	15	SOD-123	Active
BZT52C9V1-E3-08	Vishay General Semiconductor	9.1	±5%	410 mW	10	SOD-123	Active
BZT52C9V1-G3-08	Vishay General Semiconductor	9.1	±5%	410 mW	10	SOD-123	Active
BZT52C9V1-G3-18	Vishay General Semiconductor	9.1	±5%	410 mW	10	SOD-123	Active
BZT52C9V1LP-7	Diodes Incorporated	9.1	±6%	250 mW	15	0402 (1006 Metric)	Active
BZT52C9V1T-7	Diodes Incorporated	9.1	±6%	300 mW	15	SOD-523	Active

Engineering Selection Recommendations

Direct Replacement (Same Package - SOD-123):

The DFLZ9V1-TP from Micro Commercial Co is the primary direct replacement. It maintains the same 9.1 V nominal voltage, ±5% tolerance, 1 W power rating, and SOD-123 package footprint as the 1N4739AW-TP. The DFLZ9V1-TP features improved impedance (4 Ohms versus 5 Ohms) and lower reverse leakage current (5 µA @ 5 V versus 10 µA @ 7 V). This part is active and ROHS3 compliant with unlimited moisture sensitivity rating.

Alternative Replacements (SOD-123 Package):

The BZT52C9V1-E3-08 and BZT52C9V1-G3-08 from Vishay General Semiconductor are functionally equivalent in the SOD-123 package. Both maintain 9.1 V nominal voltage and ±5% tolerance matching the original specification. These parts are rated at 410 mW, which is lower than the original 1 W rating. Selection of these alternatives is appropriate for applications where power dissipation does not exceed 410 mW. Both are active products with ROHS3 compliance and REACH unaffected status.

The BZT52C9V1-G3-18 provides identical electrical specifications to the BZT52C9V1-G3-08 with higher inventory availability (10,907 pieces versus 863 pieces).

Lower Power Alternatives:

The BZT52C9V1-13-F and BZT52C9V1-7-F from Diodes Incorporated are rated at 500 mW in the SOD-123 package. These parts maintain 9.1 V nominal voltage but feature ±6% tolerance (versus ±5% of the original). Selection is appropriate for applications with power dissipation up to 500 mW. Both are active with ROHS3 compliance and REACH unaffected status.

Compact Package Alternatives:

The BZT52C9V1LP-7 offers a miniaturized 0402 (1006 Metric) package with 250 mW power rating, suitable for space-constrained applications. The BZT52C9V1T-7 provides a SOD-523 package option with 300 mW power rating. Both maintain 9.1 V nominal voltage and are active products with full compliance certifications.

All substitute parts listed are ROHS3 compliant with moisture sensitivity level 1 (unlimited), matching the environmental specifications of the original component.

Frequently Asked Questions (FAQ)

Q: Can the DFLZ9V1-TP directly replace the 1N4739AW-TP in all applications?

A: The DFLZ9V1-TP is a direct functional replacement with identical electrical specifications (9.1 V, ±5%, 1 W) and the same SOD-123 package footprint. The primary difference is the package designation (SOD-123F versus SOD-123), which represents a minor variant of the same physical package. Direct substitution is applicable without circuit modification.

Q: What is the difference between the BZT52C9V1-E3-08 and BZT52C9V1-G3-08?

A: Both parts are manufactured by Vishay General Semiconductor with identical electrical specifications (9.1 V, ±5%, 410 mW, SOD-123 package). The designations E3-08 and G3-08 represent different manufacturing codes or tape configurations. Electrical performance and package compatibility are equivalent.

Q: Can I use a 410 mW rated part (BZT52C9V1-E3-08) instead of the original 1 W part?

A: The 410 mW rated parts are suitable for applications where actual power dissipation does not exceed 410 mW. If the circuit design requires the full 1 W dissipation capability, the DFLZ9V1-TP (1 W rated) or BZT52C9V1-13-F (500 mW rated) are more appropriate selections. Circuit analysis is required to determine actual power dissipation requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed in this reference are ROHS3 compliant. The original 1N4739AW-TP is also ROHS3 compliant. All parts maintain moisture sensitivity level 1 (unlimited).

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

A: SOD-123F is a variant designation of the SOD-123 package. Both represent the same physical footprint and are mechanically and electrically compatible. The "F" designation typically indicates a specific manufacturing or tape configuration variant. PCB layout and component placement are identical.

Q: Can I use the BZT52C9V1LP-7 (0402 package) as a replacement?

A: The BZT52C9V1LP-7 maintains the same 9.1 V nominal voltage and ±6% tolerance but uses a different package footprint (0402/1006 Metric versus SOD-123). This part is suitable only if the PCB layout can accommodate the 0402 package. The 250 mW power rating is lower than the original 1 W specification and must be verified against circuit requirements.

Q: What does the tolerance specification (±5% versus ±6%) mean for zener diode selection?

A: Zener voltage tolerance specifies the acceptable variation range of the nominal zener voltage. The original 1N4739AW-TP has ±5% tolerance, meaning the actual zener voltage can range from 8.64 V to 9.56 V. Substitute parts with ±6% tolerance have a slightly wider acceptable range (8.55 V to 9.65 V). For voltage regulation applications requiring tighter control, the ±5% tolerance parts (DFLZ9V1-TP, BZT52C9V1-E3-08, BZT52C9V1-G3-08, BZT52C9V1-G3-18) are preferred.

Q: Is the BZT52C9V1T-7 (SOD-523 package) compatible with my existing PCB?

A: The BZT52C9V1T-7 uses the SOD-523 package, which has a different footprint than the original SOD-123 package. This part is not a direct PCB replacement without layout modification. Selection is appropriate only if the PCB design can be updated to accommodate the SOD-523 footprint.

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