DL4755A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The DL4755A-TP is a 43 V, 1 W surface mount zener diode manufactured by Micro Commercial Co in MELF (DO-213AB) package format. This component is classified as obsolete, though 10,085 pieces remain in stock as new original inventory. The obsolete status necessitates identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for ongoing design support and production requirements.

Substiute Parts

DL4755A-TP

Micro Commercial CoIn Stock: 10170DL4755A-TP Datasheet

Current PartRFQ

SMAJ4755A-TP

Micro Commercial CoIn Stock: 5938SMAJ4755A-TP Datasheet

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GLL4755-E3/97

Vishay General Semiconductor - Diodes DivisionIn Stock: 1082GLL4755-E3/97 Datasheet

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GLL4755A-E3/96

Vishay General Semiconductor - Diodes DivisionIn Stock: 1034GLL4755A-E3/96 Datasheet

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GLL4755A-E3/97

Vishay General Semiconductor - Diodes DivisionIn Stock: 945GLL4755A-E3/97 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DL4755A-TP is determined by the following critical parameters:

Electrical Parameters (Must Match):

• Zener voltage: 43 V nominal
• Power dissipation: 1 W maximum
• Impedance: 70 Ohms maximum
• Reverse leakage current: 5 µA @ 32.7 V
• Voltage tolerance: ±5% or tighter

Mechanical Parameters (Must Match):

• Surface mount technology
• Package format: DO-213AB MELF or equivalent footprint-compatible package

Compliance Parameters (Must Match):

• RoHS3 compliance
• Moisture sensitivity level 1

Substitute parts are grouped into two categories based on package compatibility:

Category 1 - MELF Package (DO-213AB): Parts maintaining identical MELF package format with active product status and ±5% tolerance specification.

Category 2 - Alternative Package (DO-214AC/SMA): Parts with identical electrical specifications but different surface mount package, requiring PCB layout modification.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (MELF Package - Direct Replacement):

The Vishay GLL4755A-E3/97 and GLL4755A-E3/96 are the preferred substitutes for the DL4755A-TP. Both parts maintain the DO-213AB MELF package format, enabling direct PCB footprint compatibility without layout modification. Both are active products with ROHS3 compliance and ±5% tolerance specification matching the original component. The GLL4755A-E3/97 and GLL4755A-E3/96 differ only in manufacturing date code designation (E3/97 and E3/96 respectively) and are electrically and mechanically identical. Operating temperature range is reduced to -65°C ~ 150°C compared to the original -65°C ~ 175°C specification.

Secondary Substitute (MELF Package - Tolerance Consideration):

The Vishay GLL4755-E3/97 maintains MELF package compatibility and active product status but specifies ±10% voltage tolerance compared to the ±5% tolerance of the original part. This substitute is applicable only in applications where the wider tolerance band is acceptable within circuit design margins.

Alternative Substitute (SMA Package - Layout Modification Required):

The Micro Commercial Co SMAJ4755A-TP provides electrical equivalence with identical 43 V, 1 W, ±5% specifications but uses the DO-214AC (SMA) package format. This substitute requires PCB layout modification and is applicable only when package footprint change is feasible. Operating temperature range is -65°C ~ 150°C.

Frequently Asked Questions (FAQ)

Q: Can GLL4755A-E3/97 replace DL4755A-TP in all applications?

A: GLL4755A-E3/97 is electrically and mechanically compatible for direct substitution in MELF package footprints. The operating temperature range is reduced from -65°C ~ 175°C to -65°C ~ 150°C. Verify that the application's maximum junction temperature requirement does not exceed 150°C.

Q: What is the difference between GLL4755A-E3/97 and GLL4755A-E3/96?

A: Both parts are electrically and mechanically identical. The designations E3/97 and E3/96 represent different manufacturing date codes from Vishay. Selection between these parts is based on inventory availability and procurement lead time.

Q: Why does GLL4755-E3/97 have ±10% tolerance instead of ±5%?

A: GLL4755-E3/97 is a different tolerance grade within the Vishay GLL4755 product family. This part is substitutable only when circuit design margins accommodate the wider ±10% voltage tolerance band.

Q: Can SMAJ4755A-TP be used as a direct replacement without PCB modification?

A: No. SMAJ4755A-TP uses the DO-214AC (SMA) package, which has a different footprint than the DO-213AB (MELF) package of the original DL4755A-TP. PCB layout modification is required for this substitution.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (GLL4755A-E3/97, GLL4755A-E3/96, GLL4755-E3/97, and SMAJ4755A-TP) are ROHS3 compliant with moisture sensitivity level 1 (unlimited).

Q: What is the impact of the reduced operating temperature range on substitute parts?

A: Substitute parts specify -65°C ~ 150°C operating range compared to the original -65°C ~ 175°C. Applications operating above 150°C junction temperature require thermal analysis to confirm compatibility. The original DL4755A-TP remains the only option for applications requiring operation above 150°C.

Q: Are there inventory differences between substitute parts?

A: Yes. GLL4755A-E3/97 has 913 pieces in stock, GLL4755A-E3/96 has 988 pieces, GLL4755-E3/97 has 1,036 pieces, and SMAJ4755A-TP has 5,926 pieces. Procurement decisions should account for lead time and availability requirements.