1N4752A-T Zener Diode 33V 1W Equivalent & Substitute Parts

Part Overview

The 1N4752A-T is a 33 V, 1 W Zener diode manufactured by Diodes Incorporated in DO-41 through-hole package configuration. This component is classified as obsolete, though 6000 pieces remain in stock as new original inventory. The 1N4752A-T is ROHS3 compliant and REACH affected, operating across a temperature range of -65°C to 175°C with ±5% voltage tolerance.

Equivalent and substitute parts are necessary due to the obsolete product status of the 1N4752A-T. Active alternatives from current manufacturers provide continued design support, improved availability, and compliance with evolving regulatory requirements while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	33	V
Power - Maximum	1	W
Tolerance	±5%	—
Impedance (Maximum)	45	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 25.1 V
Voltage - Forward (Maximum) @ If	1.2	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—

Substitute Part Grouping Explanation

Substitution of the 1N4752A-T is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - Zener (Nominal): 33 V
Power - Maximum: 1 W (or higher)
Tolerance: ±5% (or tighter)
Impedance (Maximum): 45 Ohms (or lower)
Current - Reverse Leakage @ Vr: 5 µA @ 25.1 V (or lower)
Voltage - Forward (Maximum) @ If: 1.2 V @ 200 mA (or lower)
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial equivalent

Substitute parts are grouped into three categories:

Direct Equivalents: Parts with identical electrical specifications (33 V, 1 W, ±5% tolerance) and compatible through-hole packaging. These include 1N4752AP/TR8, 1N4752A-T50A, 1N4752ATR, and 1N4752A from Lumimax Optoelectronic Technology.

Upgraded Equivalents: Parts with superior electrical performance (higher power ratings, lower impedance, or lower reverse leakage) while maintaining 33 V nominal voltage and ±5% tolerance. These include 1N5937BP-TP (1.5 W), 1N5937B3P-TP (3 W), and 2EZ33D5 (2 W).

Tolerance Variants: Parts with identical electrical specifications except for voltage tolerance (±10% instead of ±5%). These include 1N4752 G and 1EZ33D5-TP, which maintain functional compatibility but with relaxed tolerance specifications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Power (W)	Tolerance	Zzt (Ohms)	Reverse Leakage (µA @ 25.1V)	Vf Max (V @ 200mA)	Temp Range (°C)	Product Status	RoHS Status
1N4752A-T	Diodes Incorporated	33	1	±5%	45	5	1.2	-65 to 175	Obsolete	ROHS3 Compliant
1N4752AP/TR8	Microchip Technology	33	1	±5%	45	5	1.2	-65 to 150	Active	RoHS non-compliant
1N4752A	Lumimax Optoelectronic Technology	33	1	±5%	45	5	1.2	-65 to 200	Active	RoHS Compliant
1N4752A-T50A	onsemi	33	1	±5%	45	5	—	-65 to 200	Active	ROHS3 Compliant
1N4752ATR	onsemi	33	1	±5%	45	5	—	-65 to 200	Active	ROHS3 Compliant
1EZ33D5-TP	Micro Commercial Co	33	1	±5%	45	5	1.2	-55 to 150	Active	—
1N4752 G	Microsemi Corporation	33	1	±10%	45	5	1.2	-65 to 175	Active	RoHS non-compliant
1N4752A G	Microsemi Corporation	33	1	±5%	45	5	1.2	-65 to 175	Active	RoHS non-compliant
1N5937B3P-TP	Micro Commercial Co	33	3	±5%	33	1	1.5	-55 to 175	Active	—
1N5937BP-TP	Micro Commercial Co	33	1.5	±5%	33	1	1.5	-55 to 175	Active	ROHS3 Compliant
2EZ33D5	Microchip Technology	33	2	±5%	23	0.5	1.2	-65 to 150	Active	RoHS non-compliant

Engineering Selection Recommendations

For Direct Replacement with Active Product Status:

The 1N4752A from Lumimax Optoelectronic Technology provides the most direct substitution path. This part maintains identical electrical specifications (33 V, 1 W, ±5% tolerance) while offering an extended operating temperature range (-65°C to 200°C versus -65°C to 175°C) and RoHS compliance. Product status is active with 18,715 pieces in stock.

The 1N4752A-T50A and 1N4752ATR from onsemi are functionally equivalent alternatives with active product status, ROHS3 compliance, and extended temperature ranges to 200°C. Both parts provide 6,993 and 9,869 pieces in stock respectively.

For RoHS Compliance Requirement:

If RoHS compliance is mandatory, select from: 1N4752A (Lumimax), 1N4752A-T50A (onsemi), 1N4752ATR (onsemi), or 1N5937BP-TP (Micro Commercial Co). The 1N4752A-T from Diodes Incorporated is ROHS3 compliant but obsolete.

For Enhanced Performance:

The 1N5937BP-TP (1.5 W) and 2EZ33D5 (2 W) provide higher power dissipation capability with lower impedance and reverse leakage characteristics. These upgrades are suitable for applications requiring improved thermal performance or tighter leakage specifications while maintaining 33 V nominal voltage.

For Temperature Range Consideration:

Applications requiring operation above 175°C should select 1N4752A (Lumimax), 1N4752A-T50A (onsemi), or 1N4752ATR (onsemi), all rated to 200°C. Applications with lower temperature requirements (-55°C minimum) may use 1EZ33D5-TP, 1N5937BP-TP, or 1N5937B3P-TP from Micro Commercial Co.

For Packaging Preference:

Tape & Reel packaging is available in 1N4752AP/TR8 (Microchip) and 1N5937BP-TP (Micro Commercial Co). Cut Tape packaging is available in 1N4752A-T50A, 1N4752ATR (onsemi), and 2EZ33D5 (Microchip). Bulk packaging is available in 1EZ33D5-TP and 1N5937B3P-TP (Micro Commercial Co).

Frequently Asked Questions (FAQ)

Q: Can 1N4752A-T be directly replaced with 1N4752A from Lumimax?

A: Yes. Both parts share identical electrical specifications: 33 V nominal voltage, 1 W power rating, ±5% tolerance, 45 Ohms maximum impedance, and 5 µA reverse leakage at 25.1 V. The Lumimax part offers extended temperature range (-65°C to 200°C) and active product status. Through-hole DO-41 packaging is compatible.

Q: What is the difference between 1N4752A-T50A and 1N4752ATR?

A: Both are onsemi products with identical electrical specifications and active status. The primary difference is packaging: 1N4752A-T50A is supplied in Cut Tape (CT) format with 6,993 pieces in stock, while 1N4752ATR is also Cut Tape with 9,869 pieces in stock. Electrical performance and temperature range (-65°C to 200°C) are identical.

Q: Why would I select 1N5937BP-TP over 1N4752A-T?

A: The 1N5937BP-TP provides 1.5 W power rating versus 1 W, lower impedance (33 Ohms versus 45 Ohms), and lower reverse leakage (1 µA versus 5 µA). These characteristics provide improved thermal performance and tighter leakage specifications. Both maintain 33 V nominal voltage and ±5% tolerance. Selection depends on application thermal requirements.

Q: Is 1N4752 G (±10% tolerance) acceptable as a substitute?

A: The 1N4752 G is electrically compatible with relaxed voltage tolerance (±10% versus ±5%). It maintains 33 V nominal voltage, 1 W power rating, and identical impedance and leakage specifications. Substitution is acceptable only if the application circuit design tolerates ±10% voltage variation. This part is RoHS non-compliant.

Q: What is the temperature range limitation for 1N4752AP/TR8?

A: The 1N4752AP/TR8 operates from -65°C to 150°C, which is 25°C lower than the original 1N4752A-T (-65°C to 175°C). Applications requiring operation above 150°C should select alternatives with extended temperature ratings: 1N4752A (Lumimax), 1N4752A-T50A, or 1N4752ATR (onsemi), all rated to 200°C.

Q: Can 2EZ33D5 be used as a direct replacement?

A: The 2EZ33D5 is functionally compatible with superior specifications: 2 W power rating, 23 Ohms impedance, and 0.5 µA reverse leakage. It maintains 33 V nominal voltage and ±5% tolerance. This part is suitable for applications requiring enhanced thermal performance. Operating temperature range is -65°C to 150°C. RoHS status is non-compliant.

Q: What packaging options are available for equivalent parts?

A: Tape & Reel (TR) packaging: 1N4752AP/TR8, 1N5937BP-TP. Cut Tape (CT) packaging: 1N4752A-T50A, 1N4752ATR, 2EZ33D5. Bulk packaging: 1EZ33D5-TP, 1N5937B3P-TP. Standard packaging (unspecified): 1N4752A (Lumimax), 1N4752 G, 1N4752A G. Selection depends on procurement and assembly requirements.

Q: Are all substitute parts REACH compliant?

A: REACH status varies. REACH Unaffected parts include: 1N4752A (Lumimax), 1N4752A-T50A, 1N4752ATR, 1EZ33D5-TP, 1N4752 G, 1N4752A G, 1N5937B3P-TP, 1N5937BP-TP, and 2EZ33D5. The original 1N4752A-T is REACH Affected. The 1N4752AP/TR8 status is not specified in available data.

Q: Which substitute offers the best inventory availability?

A: The 1N4752A from Lumimax Optoelectronic Technology has the highest inventory with 18,715 pieces in stock. onsemi alternatives (1N4752A-T50A with 6,993 pieces and 1N4752ATR with 9,869 pieces) also provide substantial availability. The original 1N4752A-T has 6,000 pieces remaining.

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