1N4750AW-TP Zener Diode 27V 1W Equivalent & Substitute Parts

Part Overview

The 1N4750AW-TP is a surface mount zener diode rated at 27 V nominal with 1 W maximum power dissipation in SOD-123 package. Manufactured by Micro Commercial Co, this component is classified as obsolete product status. Due to obsolescence, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute components maintain the core 27 V zener voltage specification while offering variations in power rating, tolerance, and package configurations to accommodate different application requirements.

Key Parameters

Parameter	1N4750AW-TP
Voltage - Zener (Nom)	27 V
Power - Max	1 W
Tolerance	±5%
Impedance (Max)	35 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 20.6 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)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 1N4750AW-TP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 27 V nominal
Mounting type: Surface mount
Operating temperature range: -55°C to 150°C minimum
RoHS3 compliance
MSL rating: 1 (Unlimited)

Secondary Variation Parameters:

Power rating: 1 W (primary), with lower-power alternatives acceptable for reduced dissipation applications
Tolerance: ±5% (primary), with tighter tolerances (±2%, ±2.5%) or wider tolerances (±7%) available
Package: SOD-123 (primary), with SOD-123F and SOD-323 as alternative packages
Impedance: 35 Ohms (primary), with alternatives ranging 15–80 Ohms

Substitute parts are grouped into three categories based on power rating alignment: full 1 W equivalents, reduced-power alternatives (410–500 mW), and ultra-compact alternatives (200–310 mW). All listed substitutes maintain the 27 V zener voltage specification and surface mount configuration required for direct replacement or design adaptation.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Power (Max)	Tolerance	Zzt (Max)	Package	Status	Temp Range
1N4750AW-TP	Micro Commercial Co	27 V	1 W	±5%	35 Ohms	SOD-123	Obsolete	-55°C ~ 150°C
DFLZ27-TP	Micro Commercial Co	27 V	1 W	±7%	15 Ohms	SOD-123F	Active	-55°C ~ 150°C
BZT52B27-E3-08	Vishay General Semiconductor	27 V	410 mW	±2%	80 Ohms	SOD-123	Active	-55°C ~ 150°C
BZT52B27-E3-18	Vishay General Semiconductor	27 V	410 mW	±2%	80 Ohms	SOD-123	Active	-55°C ~ 150°C
BZT52B27-G3-08	Vishay General Semiconductor	27 V	410 mW	±2%	80 Ohms	SOD-123	Active	-55°C ~ 150°C
BZT52C27-7-F	Diodes Incorporated	27 V	500 mW	±7%	80 Ohms	SOD-123	Active	-65°C ~ 150°C
BZT52C27-G3-08	Vishay General Semiconductor	27 V	410 mW	±5%	80 Ohms	SOD-123	Active	-55°C ~ 150°C
BZT52C27-G3-18	Vishay General Semiconductor	27 V	410 mW	±5%	80 Ohms	SOD-123	Active	-55°C ~ 150°C
DDZ27D-7	Diodes Incorporated	27 V	310 mW	±2.5%	45 Ohms	SOD-123	Active	-65°C ~ 150°C
DDZ27DS-7	Diodes Incorporated	27 V	200 mW	±2.5%	45 Ohms	SOD-323	Active	-65°C ~ 150°C
DDZ9711-7	Diodes Incorporated	27 V	500 mW	±5%	Not specified	SOD-123	Active	-65°C ~ 150°C

Engineering Selection Recommendations

Direct Replacement (Same Power Rating): The DFLZ27-TP from Micro Commercial Co is the primary direct replacement for the 1N4750AW-TP. Both components are rated at 1 W maximum power dissipation and maintain the 27 V zener voltage specification. The DFLZ27-TP is active product status with ROHS3 compliance and MSL 1 rating. The primary difference is package variant (SOD-123F versus SOD-123) and tolerance specification (±7% versus ±5%). This substitution is suitable for applications where the 1 W power rating is required and package footprint compatibility can be accommodated.

Reduced-Power Alternatives (410–500 mW): The BZT52 series from Vishay General Semiconductor (BZT52B27-E3-08, BZT52B27-E3-18, BZT52B27-G3-08, BZT52C27-G3-08, BZT52C27-G3-18) and Diodes Incorporated (BZT52C27-7-F, DDZ9711-7) offer 410–500 mW power ratings. These components are suitable for applications where power dissipation does not exceed the specified maximum. All are active product status with ROHS3 compliance and MSL 1 rating. The BZT52 series offers tighter tolerance specifications (±2% to ±5%) compared to the original part. These alternatives are compatible with SOD-123 package footprints.

Ultra-Compact Alternatives (200–310 mW): The DDZ27D-7 (310 mW, SOD-123) and DDZ27DS-7 (200 mW, SOD-323) from Diodes Incorporated provide lower power ratings in compact packages. These components are active product status with ROHS3 compliance and extended operating temperature range (-65°C to 150°C). The DDZ27DS-7 uses SOD-323 package, which differs from the original SOD-123 footprint and requires layout modification. These alternatives are suitable for low-power applications where space and thermal constraints are critical.

Compliance and Certification: All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage requirements. All active substitutes carry EAR99 ECCN classification and REACH Unaffected status where specified.

Frequently Asked Questions (FAQ)

Q: Can the DFLZ27-TP directly replace the 1N4750AW-TP in existing PCB designs?

A: The DFLZ27-TP maintains the same 27 V zener voltage, 1 W power rating, and surface mount configuration. However, the package variant differs (SOD-123F versus SOD-123). PCB footprint compatibility must be verified before substitution. If the SOD-123F footprint is compatible with the existing design, direct replacement is feasible.

Q: What is the difference between the BZT52B27 and BZT52C27 series?

A: Both series are 27 V zener diodes in SOD-123 package with 410 mW power rating. The primary difference is tolerance specification: BZT52B27 offers ±2% tolerance, while BZT52C27 offers ±5% tolerance. The BZT52B27 series provides tighter voltage regulation at the cost of higher component cost. Selection depends on application voltage tolerance requirements.

Q: Are the reduced-power alternatives (410–500 mW) suitable for all applications using the 1N4750AW-TP?

A: Reduced-power alternatives are suitable only for applications where maximum power dissipation does not exceed the specified rating of the substitute component. Applications requiring sustained 1 W dissipation must use the DFLZ27-TP or equivalent 1 W rated component. Thermal analysis of the specific application is required to determine acceptable power rating.

Q: What is the significance of the SOD-323 package used in the DDZ27DS-7?

A: The SOD-323 package is a smaller form factor compared to SOD-123, offering reduced board space. However, this package change requires PCB layout modification and is not a direct footprint replacement. The DDZ27DS-7 is suitable only for new designs where the compact package is advantageous and the 200 mW power rating is sufficient.

Q: How do tolerance specifications affect component selection?

A: Tolerance specifications define the allowable deviation from the nominal 27 V zener voltage. The original 1N4750AW-TP specifies ±5% tolerance. Tighter tolerances (±2%, ±2.5%) provide more precise voltage regulation but may increase component cost. Wider tolerances (±7%) reduce cost but allow greater voltage variation. Application voltage regulation requirements determine acceptable tolerance range.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed in this reference are ROHS3 compliant. This compliance status ensures compatibility with current manufacturing standards and regulatory requirements. The original 1N4750AW-TP is also ROHS3 compliant.

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

A: The original 1N4750AW-TP and most Vishay BZT52 series components specify -55°C to 150°C operating range. Diodes Incorporated components (DDZ27D-7, DDZ27DS-7, DDZ9711-7) extend the lower temperature limit to -65°C. This extended range provides additional margin for applications operating in extreme cold environments. Applications operating within -55°C to 150°C range are compatible with all listed substitutes.

Q: Can multiple lower-power zener diodes be used in parallel to achieve 1 W equivalent dissipation?

A: Parallel connection of zener diodes is not addressed in this reference and requires separate thermal and electrical analysis. Component selection should be based on single-device ratings specified in manufacturer datasheets.

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