1N4752AW-TP Equivalent & Substitute Parts

Part Overview

The 1N4752AW-TP is a Zener diode rated at 33 V, 1 W with ±5% tolerance, manufactured by Micro Commercial Co in SOD-123 surface mount package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement. The part maintains ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Key Parameters

Parameter	Value	Unit
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) @ If	1.2	V @ 200 mA
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	SOD-123	-

Substitute Part Grouping Explanation

Substitution of the 1N4752AW-TP is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage: 33 V nominal
Operating temperature range: -55°C to 150°C minimum
Surface mount package: SOD-123 or SOD-123F compatible
RoHS3 compliance
MSL 1 rating

Substitution Categories:

Direct Equivalent (Parametric Match): MM1W33 matches all electrical specifications including 1 W power rating, 33 V zener voltage, ±5% tolerance, 45 Ohms impedance, and 5 µA reverse leakage current. This part is active and maintains identical performance envelope.

Similar Substitutes (Reduced Power Rating): BZT52B33-G3-18, BZT52B33-G3-08, BZT52C33-G3-08, BZT52C33-G3-18, MMSZ5257C-G3-18, and MMSZ5257C-G3-08 operate at 33 V nominal with reduced maximum power dissipation (410 mW to 500 mW). These parts are suitable where power requirements do not exceed their ratings.

Direct Manufacturer Equivalent (Enhanced Performance): DFLZ33-TP from Micro Commercial Co provides improved impedance characteristics (15 Ohms vs. 45 Ohms) and lower reverse leakage (1 µA vs. 5 µA) while maintaining 1 W power rating and 33 V specification. Package variant is SOD-123F.

Alternative Manufacturer (Higher Power Option): CMHZ5257B TR PBFREE from Central Semiconductor Corp offers 500 mW power rating with extended lower temperature limit (-65°C vs. -55°C).

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (W/mW)	Zzt (Ohms)	Ir @ Vr (µA/nA)	Package	Status
1N4752AW-TP	Micro Commercial Co	33	±5%	1 W	45	5 µA @ 25.1 V	SOD-123	Obsolete
MM1W33	NextGen Components	33	±5%	1 W	45	5 µA @ 25 V	SOD-123	Active
DFLZ33-TP	Micro Commercial Co	33	±5%	1 W	15	1 µA @ 24 V	SOD-123F	Active
BZT52B33-G3-18	Vishay General Semiconductor	33	±2%	410 mW	80	100 nA @ 25 V	SOD-123	Active
BZT52B33-G3-08	Vishay General Semiconductor	33	±2%	410 mW	80	100 nA @ 25 V	SOD-123	Active
BZT52C33-E3-08	Vishay General Semiconductor	33	±5%	410 mW	80	100 nA @ 25 V	SOD-123	Active
BZT52C33-G3-08	Vishay General Semiconductor	33	±5%	410 mW	80	100 nA @ 25 V	SOD-123	Active
BZT52C33-G3-18	Vishay General Semiconductor	33	±5%	410 mW	80	100 nA @ 25 V	SOD-123	Active
MMSZ5257C-G3-08	Vishay General Semiconductor	33	±2%	500 mW	58	100 nA @ 25 V	SOD-123	Active
MMSZ5257C-G3-18	Vishay General Semiconductor	33	±2%	500 mW	58	100 nA @ 25 V	SOD-123	Active
CMHZ5257B TR PBFREE	Central Semiconductor Corp	33	±5%	500 mW	58	100 nA @ 25 V	SOD-123	Active

Engineering Selection Recommendations

Primary Selection - Parametric Equivalent: MM1W33 from NextGen Components is the direct parametric equivalent, matching all electrical specifications of the 1N4752AW-TP including 1 W power dissipation, 33 V zener voltage, ±5% tolerance, and identical impedance characteristics. This part is active with ROHS3 compliance and unlimited MSL rating. Selection of MM1W33 requires no circuit redesign or thermal management recalculation.

Secondary Selection - Enhanced Performance from Original Manufacturer: DFLZ33-TP from Micro Commercial Co provides superior performance characteristics with reduced impedance (15 Ohms vs. 45 Ohms) and lower reverse leakage current (1 µA vs. 5 µA) while maintaining 1 W power rating. The SOD-123F package variant is mechanically compatible with SOD-123 footprints. This selection is appropriate for applications requiring improved regulation characteristics.

Alternative Selection - Reduced Power Applications: BZT52C33-G3-08 or BZT52C33-G3-18 from Vishay General Semiconductor are suitable for applications where power dissipation does not exceed 410 mW. These parts offer ±5% tolerance matching the original specification and are available in high inventory quantities. Selection requires verification that circuit power requirements remain within 410 mW maximum rating.

Alternative Selection - Intermediate Power Rating: MMSZ5257C-G3-08 or MMSZ5257C-G3-18 from Vishay General Semiconductor provide 500 mW power rating with improved impedance (58 Ohms) and are suitable for applications requiring power dissipation between 410 mW and 500 mW. These parts maintain ±2% tolerance and are ROHS3 compliant.

Extended Temperature Range Option: CMHZ5257B TR PBFREE from Central Semiconductor Corp extends the lower operating temperature limit to -65°C (vs. -55°C) while providing 500 mW power rating. This selection is appropriate for applications requiring enhanced low-temperature performance.

All recommended substitutes maintain ROHS3 compliance, MSL 1 rating, and SOD-123 package compatibility.

Frequently Asked Questions (FAQ)

Q: Can MM1W33 be used as a direct replacement for 1N4752AW-TP? A: Yes. MM1W33 is a parametric equivalent with identical electrical specifications: 33 V zener voltage, 1 W power rating, ±5% tolerance, 45 Ohms impedance, and 5 µA reverse leakage current. No circuit modifications are required.

Q: What is the difference between DFLZ33-TP and 1N4752AW-TP? A: DFLZ33-TP maintains the same 33 V, 1 W specifications but offers improved performance with lower impedance (15 Ohms vs. 45 Ohms) and reduced reverse leakage (1 µA vs. 5 µA). The package variant is SOD-123F instead of SOD-123, but both are mechanically compatible with standard SOD-123 footprints.

Q: Can I use BZT52C33-G3-08 in place of 1N4752AW-TP? A: BZT52C33-G3-08 is suitable only if circuit power requirements do not exceed 410 mW. This part has reduced power rating (410 mW vs. 1 W) compared to the original. Verify that your application does not require the full 1 W dissipation capability before substitution.

Q: What is the significance of the ±2% tolerance in BZT52B33-G3-18 compared to the ±5% tolerance of 1N4752AW-TP? A: The ±2% tolerance provides tighter zener voltage regulation compared to ±5%. This is a performance improvement suitable for applications requiring more precise voltage reference characteristics. Circuits designed for ±5% tolerance will operate correctly with ±2% parts.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All recommended substitute parts maintain ROHS3 compliance status, matching the original 1N4752AW-TP specification.

Q: What is the difference between SOD-123 and SOD-123F packages? A: SOD-123F is a variant of SOD-123 with improved lead forming characteristics. Both packages are mechanically and electrically compatible with standard SOD-123 PCB footprints. DFLZ33-TP uses SOD-123F packaging.

Q: Which substitute part has the lowest reverse leakage current? A: DFLZ33-TP has the lowest reverse leakage at 1 µA @ 24 V, compared to 5 µA @ 25.1 V for the original 1N4752AW-TP. All other substitutes specify 100 nA @ 25 V, which is significantly lower than both.

Q: Can I use CMHZ5257B TR PBFREE for applications requiring operation below -55°C? A: Yes. CMHZ5257B TR PBFREE extends the lower operating temperature limit to -65°C, making it suitable for applications requiring enhanced low-temperature performance. The 500 mW power rating must still be verified against circuit requirements.

Q: What inventory availability should I consider for procurement? A: MM1W33 has the highest inventory (100,400 pcs), followed by BZT52C33-E3-08 (15,463 pcs) and CMHZ5257B TR PBFREE (13,351 pcs). DFLZ33-TP from the original manufacturer has 790 pcs available. Inventory levels should be considered for supply chain planning.

Q: Are there any thermal management differences between the 1 W and 410 mW rated parts? A: Yes. The 1 W rated parts (1N4752AW-TP, MM1W33, DFLZ33-TP) can dissipate higher power levels than 410 mW rated parts. Applications requiring sustained power dissipation above 410 mW must use 1 W or 500 mW rated alternatives to prevent thermal stress and component failure.

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