DL4752A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The DL4752A-TP is a 33 V, 1 W surface mount zener diode manufactured by Micro Commercial Co in MELF (DO-213AB) package configuration. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and production continuity. Equivalent and substitute parts maintain identical or compatible electrical specifications while offering alternative packaging formats or active product status from qualified manufacturers.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	33 V
Tolerance	±5%
Power - Max	1 W
Impedance (Max)	45 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 25.1 V
Voltage - Forward (Vf) (Max)	1.2 V
Operating Temperature Range	-65°C ~ 175°C
Mounting Type	Surface Mount
Package / Case	DO-213AB, MELF
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the DL4752A-TP are classified based on electrical parameter equivalence and mechanical compatibility. The substitution logic is determined by the following criteria:

Electrical Equivalence Parameters:

Zener voltage: 33 V nominal
Tolerance: ±5%
Maximum power dissipation: 1 W
Impedance (Max): 45 Ohms
Reverse leakage current: 5 µA @ 25.1 V
Forward voltage: 1.2 V maximum

Mechanical Compatibility Parameters:

Surface mount mounting type
Package format: DO-213AB (MELF) or DO-214AC (SMA)
Tape & Reel packaging availability

Compliance Parameters:

ROHS3 compliance
REACH unaffected status
EAR99 classification

Substitute parts are grouped into two categories: direct package equivalents and alternative package formats that maintain full electrical compatibility.

Parameter Comparison

Parameter	DL4752A-TP (Main)	1N4752AUR/TR (Substitute)	SMAJ4752A-TP (Substitute)
Manufacturer	Micro Commercial Co	Microchip Technology	Micro Commercial Co
Voltage - Zener (Nom)	33 V	33 V	33 V
Tolerance	±5%	±5%	±5%
Power - Max	1 W	1 W	1 W
Impedance (Max)	45 Ohms	45 Ohms	45 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 25.1 V	5 µA @ 25.1 V	5 µA @ 25.1 V
Voltage - Forward (Vf) (Max)	1.2 V @ 200 mA	1.2 V @ 200 mA	1.2 V @ 100 mA
Operating Temperature Range	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AB, MELF	DO-213AB, MELF	DO-214AC, SMA
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

1N4752AUR/TR (Microchip Technology)

This part is a parametric equivalent with identical electrical specifications and matching DO-213AB MELF package format. The 1N4752AUR/TR maintains the full operating temperature range of -65°C to 175°C and supports forward voltage measurement at 200 mA, matching the main part specification. Product status is active, ensuring long-term availability. This substitute is recommended for direct replacement in applications requiring MELF package retention and extended temperature performance.

SMAJ4752A-TP (Micro Commercial Co)

This part provides electrical equivalence with alternative DO-214AC (SMA) package format. The SMAJ4752A-TP operates within -65°C to 150°C temperature range, which is suitable for applications not requiring the extended upper temperature limit of 175°C. Forward voltage is specified at 100 mA rather than 200 mA. Product status is active with higher inventory availability. This substitute is applicable for designs that can accommodate SMA package footprint changes and do not require the full temperature operating range of the original part.

Both substitutes maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility with the original DL4752A-TP specification.

Frequently Asked Questions (FAQ)

Q: Can the 1N4752AUR/TR directly replace the DL4752A-TP in existing PCB designs?

A: Yes. The 1N4752AUR/TR maintains identical DO-213AB MELF package format, electrical specifications, and operating temperature range. No PCB layout modifications are required for direct substitution.

Q: What is the primary difference between the 1N4752AUR/TR and SMAJ4752A-TP substitutes?

A: The 1N4752AUR/TR uses DO-213AB MELF packaging identical to the main part, while the SMAJ4752A-TP uses DO-214AC SMA packaging. The SMAJ4752A-TP also operates to 150°C maximum versus 175°C for the other parts. Both maintain identical zener voltage, power rating, and impedance specifications.

Q: Does the SMAJ4752A-TP require PCB layout changes?

A: Yes. The SMAJ4752A-TP uses DO-214AC SMA package format, which differs from the DO-213AB MELF package of the main part. PCB footprint modification is necessary for this substitution.

Q: Are all three parts RoHS3 compliant?

A: Yes. The DL4752A-TP, 1N4752AUR/TR, and SMAJ4752A-TP are all ROHS3 compliant and REACH unaffected.

Q: Which substitute should be selected for applications requiring maximum operating temperature?

A: The 1N4752AUR/TR supports the full -65°C to 175°C operating range matching the original DL4752A-TP. The SMAJ4752A-TP is limited to -65°C to 150°C and is not suitable for applications requiring 175°C operation.

Q: What is the inventory status of available substitutes?

A: The 1N4752AUR/TR has 793 pieces in stock. The SMAJ4752A-TP has 7600 pieces in stock. Both are active products with ongoing availability.

Q: Are the electrical specifications identical across all three parts?

A: Zener voltage (33 V), tolerance (±5%), power rating (1 W), impedance (45 Ohms), and reverse leakage current (5 µA @ 25.1 V) are identical. Forward voltage specification differs: the main part and 1N4752AUR/TR specify 1.2 V @ 200 mA, while the SMAJ4752A-TP specifies 1.2 V @ 100 mA.

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