1N4734AW-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4734AW-TP is a 5.6 V, 1 W surface mount zener diode manufactured by Micro Commercial Co in SOD-123 package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. The part maintains ROHS3 compliance and operates across the industrial temperature range of -55°C to 150°C.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	5.6 V
Tolerance	±5%
Power - Max	1 W
Impedance (Max)	5 Ohms
Current - Reverse Leakage @ Vr	10 µA @ 2 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA
Operating Temperature	-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 1N4734AW-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage: 5.6 V nominal
Package type: SOD-123 or SOD-123F surface mount
Operating temperature range: -55°C to 150°C minimum
RoHS3 compliance
Moisture sensitivity level: 1 (Unlimited)

Secondary Compatibility Factors:

Power dissipation capacity: 1 W or greater
Voltage tolerance: ±5% or tighter
Impedance characteristics: 5 Ohms or lower preferred
Reverse leakage current: 10 µA @ 2 V or lower

Substitute parts are grouped into two categories:

Direct Equivalent (Active Status): DFLZ5V6-TP maintains identical electrical specifications and active product status, differing only in package variant (SOD-123FL) and supplier packaging format.

Functional Equivalents (Lower Power Rating): Vishay BZT52 series and Diodes Incorporated BZT52C series parts provide 5.6 V zener voltage with reduced power ratings (250 mW to 500 mW). These parts are suitable for applications where the full 1 W dissipation capacity is not required. All maintain SOD-123 package compatibility and required compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Zzt (Max)	Package	Status	Temp Range
1N4734AW-TP	Micro Commercial Co	5.6 V	±5%	1 W	5 Ohms	SOD-123	Obsolete	-55°C ~ 150°C
DFLZ5V6-TP	Micro Commercial Co	5.6 V	±5%	1 W	5 Ohms	SOD-123F	Active	-55°C ~ 150°C
BZT52B5V6-E3-08	Vishay General Semiconductor	5.6 V	±2%	410 mW	40 Ohms	SOD-123	Active	-55°C ~ 150°C
BZT52B5V6-E3-18	Vishay General Semiconductor	5.6 V	±2%	410 mW	40 Ohms	SOD-123	Active	-55°C ~ 150°C
BZT52C5V6-13-F	Diodes Incorporated	5.6 V	±7%	370 mW	40 Ohms	SOD-123	Active	-65°C ~ 150°C
BZT52C5V6-7-F	Diodes Incorporated	5.6 V	±7%	500 mW	40 Ohms	SOD-123	Active	-65°C ~ 150°C
BZT52C5V6-G3-08	Vishay General Semiconductor	5.6 V	±5%	410 mW	40 Ohms	SOD-123	Active	-55°C ~ 150°C
BZT52C5V6-G3-18	Vishay General Semiconductor	5.6 V	±5%	410 mW	40 Ohms	SOD-123	Active	-55°C ~ 150°C
BZT52C5V6-HE3-08	Vishay General Semiconductor	5.6 V	±5%	410 mW	40 Ohms	SOD-123	Obsolete	-55°C ~ 150°C
BZT52C5V6-HE3-18	Vishay General Semiconductor	5.6 V	±5%	410 mW	40 Ohms	SOD-123	Obsolete	-55°C ~ 150°C
BZT52C5V6LP-7	Diodes Incorporated	5.6 V	±7%	250 mW	40 Ohms	0402 (1006 Metric)	Active	-65°C ~ 150°C

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

DFLZ5V6-TP is the primary recommended substitute. This part is manufactured by the same supplier (Micro Commercial Co), maintains identical electrical specifications (5.6 V, 1 W, ±5% tolerance), and holds active product status. The only difference is the package variant (SOD-123F versus SOD-123), which is mechanically compatible with standard SOD-123 footprints. This part is ROHS3 compliant with unlimited moisture sensitivity rating.

For Power-Constrained Applications:

When the full 1 W dissipation capacity is not required, the following active parts provide suitable alternatives:

BZT52C5V6-7-F (Diodes Incorporated): 500 mW power rating, ±7% tolerance, active status, extended temperature range to -65°C
BZT52C5V6-G3-08 and BZT52C5V6-G3-18 (Vishay): 410 mW power rating, ±5% tolerance, active status, matching temperature range
BZT52B5V6-E3-08 and BZT52B5V6-E3-18 (Vishay): 410 mW power rating, ±2% tolerance (tighter), active status

All recommended substitutes maintain SOD-123 package compatibility, ROHS3 compliance, and unlimited moisture sensitivity rating.

Obsolete Parts to Avoid:

BZT52C5V6-HE3-08 and BZT52C5V6-HE3-18 are classified as obsolete and should not be selected for new designs, despite their automotive qualification (AEC-Q101).

Package Consideration:

BZT52C5V6LP-7 uses a 0402 (1006 Metric) package and is not recommended as a direct substitute due to incompatible footprint with SOD-123 designs.

Frequently Asked Questions (FAQ)

Q: Can DFLZ5V6-TP be used as a direct replacement for 1N4734AW-TP?

A: Yes. DFLZ5V6-TP is electrically identical with matching 5.6 V zener voltage, 1 W power rating, ±5% tolerance, and operating temperature range. The SOD-123F package is mechanically compatible with SOD-123 footprints. Both parts are ROHS3 compliant with unlimited moisture sensitivity.

Q: What is the difference between the 1 W rated 1N4734AW-TP and the 410 mW rated BZT52 series parts?

A: The primary difference is maximum power dissipation capacity. The 1N4734AW-TP can dissipate up to 1 W continuously, while BZT52 series parts are rated for 410 mW maximum. Selection depends on the application's thermal requirements. If the circuit dissipates less than 410 mW, BZT52 series parts are suitable. For applications requiring higher power dissipation, the 1 W rated DFLZ5V6-TP is necessary.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), matching the original 1N4734AW-TP specifications.

Q: What is the significance of the tolerance differences (±2%, ±5%, ±7%)?

A: Tolerance indicates the allowable deviation from the nominal 5.6 V zener voltage. Tighter tolerances (±2%) provide more precise voltage regulation. The original part specifies ±5%. Parts with ±2% tolerance (BZT52B5V6 series) offer improved precision. Parts with ±7% tolerance (BZT52C5V6 series from Diodes Incorporated) provide acceptable performance for applications with less stringent voltage regulation requirements.

Q: Can I use BZT52C5V6LP-7 as a substitute?

A: No. While BZT52C5V6LP-7 maintains the 5.6 V zener voltage and active product status, it uses a 0402 (1006 Metric) package instead of SOD-123. This package is physically incompatible with SOD-123 PCB footprints and requires circuit board redesign.

Q: Why are BZT52C5V6-HE3-08 and BZT52C5V6-HE3-18 listed if they are obsolete?

A: These parts are included for reference purposes only, documenting the complete substitution landscape. Both parts are classified as obsolete and should not be selected for new designs or production. Active alternatives with identical or superior specifications are available.

Q: What is the operating temperature range difference between parts?

A: Most substitute parts operate from -55°C to 150°C, matching the original 1N4734AW-TP. Diodes Incorporated BZT52C5V6 series parts extend the lower temperature limit to -65°C, providing enhanced cold-temperature performance. This extended range does not affect compatibility for applications within the -55°C to 150°C window.

Q: Are there packaging format differences I should consider?

A: Yes. The original 1N4734AW-TP uses standard tape and reel packaging. DFLZ5V6-TP also uses tape and reel format. Vishay and Diodes Incorporated parts are available in both cut tape (CT) and tape & reel (TR) formats. Verify packaging format availability with your supplier to ensure compatibility with your assembly process.

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