1N4756AW-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4756AW-TP is a 47 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 active equivalent and substitute parts for ongoing design requirements and procurement needs. The part maintains ROHS3 compliance and unlimited moisture sensitivity rating, making it suitable for industrial and commercial applications requiring voltage regulation and transient protection.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	47	V
Tolerance	±5%	-
Power - Max	1	W
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 35.8 V
Voltage - Forward (Vf) (Max) @ If	1.2	V @ 200 mA
Operating Temperature Range	-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 1N4756AW-TP is determined by the following critical parameters: nominal zener voltage of 47 V, power dissipation rating of 1 W, impedance specification of 80 Ohms maximum, and surface mount SOD-123 package configuration. The tolerance of ±5% on zener voltage and operating temperature range of -55°C to 150°C define the functional boundaries for equivalent parts.

Substitute parts are grouped into two categories:

Direct Equivalent (Active Status): Parts maintaining identical electrical specifications and package type, enabling direct replacement without circuit modification.

Parametric Equivalent (Active Status): Parts with matching zener voltage and power rating but differing in secondary parameters such as impedance, leakage current, or forward voltage characteristics. These parts function within the same application scope but may exhibit different performance characteristics in specific circuit conditions.

Parameter Comparison

Parameter	1N4756AW-TP	DFLZ47-TP	CMHZ5261B TR PBFREE	MM1W47
Manufacturer	Micro Commercial Co	Micro Commercial Co	Central Semiconductor Corp	NextGen Components
Product Status	Obsolete	Active	Active	Active
Voltage - Zener (Nom)	47 V	47 V	47 V	47 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	1 W	1 W	500 mW	1 W
Impedance (Max)	80 Ohms	80 Ohms	105 Ohms	80 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 35.8 V	5 µA @ 35.8 V	100 nA @ 36 V	1 µA @ 35 V
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 200 mA	1.2 V @ 200 mA	900 mV @ 10 mA	1.2 V @ 10 mA
Operating Temperature Range	-55 to 150°C	-55 to 150°C (TJ)	-65 to 150°C	-55 to 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-123	SOD-123F	SOD-123	SOD-123
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

DFLZ47-TP (Micro Commercial Co): This part is the primary direct equivalent, manufactured by the same supplier as the obsolete 1N4756AW-TP. It maintains identical electrical specifications including 47 V zener voltage, 1 W power rating, and 80 Ohms impedance. The package variant SOD-123F is mechanically compatible with SOD-123 footprints. Product status is active with ROHS3 compliance and unlimited moisture sensitivity. This part is recommended for direct replacement in existing designs.

MM1W47 (NextGen Components): This part provides parametric equivalence with matching 47 V zener voltage and 1 W power rating. Impedance and forward voltage characteristics are identical to the original part. Operating temperature range matches the original specification. Product status is active with RoHS compliance. This part is suitable for applications where manufacturer diversification is required.

CMHZ5261B TR PBFREE (Central Semiconductor Corp): This part maintains the 47 V zener voltage and ±5% tolerance but operates at reduced power dissipation of 500 mW compared to the original 1 W rating. Impedance is specified at 105 Ohms maximum, and reverse leakage current is significantly lower at 100 nA. Operating temperature range extends to -65°C minimum. This part is suitable for applications where lower power dissipation and reduced leakage current are beneficial, provided circuit design accommodates the 500 mW power limit. Product status is active with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can DFLZ47-TP directly replace 1N4756AW-TP without circuit modification?

A: Yes. DFLZ47-TP maintains identical electrical specifications and is manufactured by the same supplier. The SOD-123F package is mechanically compatible with SOD-123 footprints. No circuit modification is required.

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

A: SOD-123F is a variant of SOD-123 with modified lead geometry optimized for tape and reel packaging. Both packages are mechanically compatible with standard SOD-123 PCB footprints.

Q: Is CMHZ5261B TR PBFREE a suitable replacement for 1N4756AW-TP?

A: CMHZ5261B TR PBFREE is a parametric equivalent with matching zener voltage and tolerance. However, it operates at 500 mW power dissipation compared to the original 1 W rating. This part is suitable only for applications where circuit design accommodates the reduced power limit. Reverse leakage current is significantly lower, which may be advantageous in certain applications.

Q: What are the key parameters that determine substitution compatibility?

A: The critical parameters are: nominal zener voltage (47 V), tolerance (±5%), power dissipation rating (1 W for direct equivalents), impedance (80 Ohms for direct equivalents), and surface mount SOD-123 package configuration. Operating temperature range and RoHS compliance status are secondary considerations for most applications.

Q: Can MM1W47 be used as a substitute for 1N4756AW-TP?

A: Yes. MM1W47 is a parametric equivalent manufactured by NextGen Components with identical 47 V zener voltage, 1 W power rating, and 80 Ohms impedance. It is suitable for applications requiring manufacturer diversification while maintaining equivalent electrical performance.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed maintain RoHS compliance (ROHS3 or RoHS Compliant status), consistent with the original 1N4756AW-TP specification.

Q: What is the moisture sensitivity level for these parts?

A: All parts, including the original and substitutes, have Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly.

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