1N4752A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The 1N4752A-TP is a 33 V, 1 W Zener diode manufactured by Micro Commercial Co in DO-41G axial through-hole package. This component is classified as obsolete, though 991 pieces remain in stock as new original inventory. The part operates across a temperature range of -65°C to 200°C and maintains ±5% voltage tolerance with a maximum impedance of 45 Ohms.

Due to the obsolete product status, identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term production requirements. Active alternatives with identical or superior electrical characteristics are available from multiple manufacturers.

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 200	°C
Mounting Type	Through Hole
Package / Case	DO-204AL, DO-41, Axial

Substitute Part Grouping Explanation

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

Primary Substitution Criteria:

Zener voltage: 33 V nominal
Power dissipation: 1 W minimum
Voltage tolerance: ±5%
Impedance: 45 Ohms maximum
Reverse leakage current: 5 µA @ 25.1 V
Forward voltage: 1.2 V @ 200 mA maximum
Package type: DO-41 or DO-204AL (axial through-hole)
Mounting: Through-hole configuration

Substitution Categories:

Direct Equivalents maintain all electrical parameters and operating temperature range (-65°C to 200°C). These parts are fully interchangeable without circuit modification.

Parametric Equivalents maintain all critical electrical parameters but may have restricted operating temperature ranges (-65°C to 150°C) or different packaging formats (Tape & Reel vs. Cut Tape). These parts are functionally equivalent for standard applications but require verification of temperature requirements.

Enhanced Alternatives exceed the minimum power specification (1.3 W vs. 1 W) or provide superior electrical characteristics (lower impedance, reduced leakage current). These parts provide additional design margin and are suitable for applications requiring enhanced performance.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (V)	Power (W)	Tolerance (%)	Zzt (Ohms)	Ir @ Vr (µA)	Vf @ If (V)	Temp Range (°C)	Package	Status
1N4752A-TP	Micro Commercial Co	33	1	±5	45	5 @ 25.1	1.2 @ 200	-65 to 200	DO-41G	Obsolete
1N4752AP-TP	Micro Commercial Co	33	1	±5	45	5 @ 25.1	1.2 @ 200	-65 to 150	DO-41	Active
1N4752A-T50A	onsemi	33	1	±5	45	5 @ 25.1	Not specified	-65 to 200	DO-41	Active
1N4752AE3/TR13	Microchip Technology	33	1	±5	45	5 @ 25.1	1.2 @ 200	-65 to 150	DO-204AL	Active
1N4752A	Lumimax Optoelectronic Technology	33	1	±5	45	5 @ 25.1	1.2 @ 200	-65 to 200	DO-41G	Active
1N4752AP/TR8	Microchip Technology	33	1	±5	45	5 @ 25.1	1.2 @ 200	-65 to 150	DO-204AL	Active
ZPY33-TR	Vishay General Semiconductor - Diodes Division	33	1.3	±5	11	0.5 @ 25	Not specified	-65 to 175	DO-204AL	Active
1N4752A TR PBFREE	Central Semiconductor Corp	33	1	±5	45	5 @ 25.1	1.2 @ 200	-65 to 200	DO-41	Active
1N4752ATR	onsemi	33	1	±5	45	5 @ 25.1	Not specified	-65 to 200	DO-41	Active
1N4752G	Taiwan Semiconductor Corporation	33	1	±5	45	5 @ 25.1	1.2 @ 200	-65 to 200	DO-204AL	Active

Engineering Selection Recommendations

Direct Replacement (Full Compatibility):

The following parts provide complete electrical and thermal equivalence to the 1N4752A-TP and are suitable for direct substitution without circuit modification:

1N4752A (Lumimax Optoelectronic Technology): Maintains identical specifications including full -65°C to 200°C operating range. Available in DO-41G package with 18,715 pieces in stock. RoHS compliant.
1N4752A TR PBFREE (Central Semiconductor Corp): Provides full parameter equivalence with -65°C to 200°C operating range. Available in Tape & Reel packaging with 1,096 pieces in stock. ROHS3 compliant.
1N4752ATR (onsemi): Delivers complete electrical equivalence with -65°C to 200°C operating range. Available in Cut Tape format with 9,869 pieces in stock. ROHS3 compliant.
1N4752G (Taiwan Semiconductor Corporation): Maintains all critical parameters with -65°C to 200°C operating range. Available in DO-204AL package with 776 pieces in stock. ROHS3 compliant.

Restricted Temperature Range Substitutes (Conditional Compatibility):

The following parts are electrically equivalent but operate only to 150°C maximum. These are suitable for applications where the upper operating temperature does not exceed 150°C:

1N4752AP-TP (Micro Commercial Co): Parametric equivalent with -65°C to 150°C range. Available in Tape & Reel with 821 pieces in stock. ROHS3 compliant.
1N4752AE3/TR13 (Microchip Technology): Parametric equivalent with -65°C to 150°C range. Available in DO-204AL package with 955 pieces in stock. ROHS3 compliant.
1N4752AP/TR8 (Microchip Technology): Parametric equivalent with -65°C to 150°C range. Available in Tape & Reel with 911 pieces in stock. RoHS non-compliant.

Enhanced Performance Alternative:

ZPY33-TR (Vishay General Semiconductor - Diodes Division): Exceeds minimum specifications with 1.3 W power rating, superior impedance (11 Ohms vs. 45 Ohms), and reduced leakage current (0.5 nA vs. 5 µA). Automotive-grade with AEC-Q101 qualification. Operates to 175°C. Available in Cut Tape with 24,024 pieces in stock. ROHS3 compliant. Suitable for applications requiring enhanced performance margin.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, with the exception of 1N4752AP/TR8 which is RoHS non-compliant. Selection should account for end-product compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can 1N4752AP-TP be used as a direct replacement for 1N4752A-TP?

A: 1N4752AP-TP is electrically equivalent but operates only to 150°C maximum, compared to 200°C for the original part. It is suitable for applications where the circuit operates below 150°C. If the design requires operation above 150°C, alternative parts with full temperature range must be selected.

Q: What is the difference between DO-41 and DO-204AL packages?

A: DO-41 and DO-204AL are equivalent designations for the same axial through-hole package. Both refer to the same physical form factor and pin configuration. Parts specified as either package type are mechanically and electrically interchangeable.

Q: Is ZPY33-TR a suitable substitute for 1N4752A-TP?

A: ZPY33-TR meets the core electrical requirements (33 V, 1 W minimum) and provides enhanced performance with lower impedance and reduced leakage current. However, it operates to 175°C maximum, which is lower than the original part's 200°C rating. It is suitable for applications not requiring operation above 175°C and where enhanced performance characteristics are beneficial.

Q: What does "Tape & Reel" packaging mean?

A: Tape & Reel (TR) packaging refers to components supplied on continuous carrier tape wound on reels, suitable for automated assembly equipment. Cut Tape (CT) refers to sections cut from the reel. Both formats contain identical components; the difference is in supply format and handling method.

Q: Are all substitute parts ROHS3 compliant?

A: Most substitute parts are ROHS3 compliant. The exception is 1N4752AP/TR8 (Microchip Technology), which is RoHS non-compliant. Compliance status must be verified against end-product requirements before selection.

Q: Can I use 1N4752A-T50A if forward voltage specifications are not provided?

A: 1N4752A-T50A maintains all critical zener parameters (33 V, 1 W, ±5%, 45 Ohms impedance, 5 µA leakage) and operates across the full -65°C to 200°C range. The absence of forward voltage specification in available documentation does not indicate a deviation from standard 1N4752 characteristics. This part is suitable for direct substitution.

Q: What inventory levels should I consider for long-term supply?

A: Inventory levels vary significantly across manufacturers. 1N4752A (Lumimax) offers the highest stock at 18,715 pieces, while 1N4752G (Taiwan Semiconductor) has the lowest at 776 pieces. For critical applications requiring sustained supply, parts with higher inventory levels provide greater supply security.

Q: Is the original 1N4752A-TP still available for purchase?

A: The 1N4752A-TP is classified as obsolete. While 991 pieces remain in stock as new original inventory, no new production is occurring. For new designs or long-term production, selection of active alternatives is necessary.

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