DL4745A-TP Equivalent & Substitute Parts

Part Overview

The DL4745A-TP is a Zener diode rated at 16 V, 1 W, manufactured by Micro Commercial Co in a surface mount MELF package. This component is classified as obsolete, which necessitates identification of equivalent substitute parts for ongoing design requirements and production continuity. The part operates across a temperature range of -65°C to 175°C and maintains ROHS3 compliance with unlimited moisture sensitivity rating.

Substiute Parts

DL4745A-TP

Micro Commercial CoIn Stock: 1111DL4745A-TP Datasheet

Current PartRFQ

SMAJ4745A-TP

Micro Commercial CoIn Stock: 16188SMAJ4745A-TP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DL4745A-TP is determined by electrical parameter equivalence and surface mount compatibility. The primary substitute, SMAJ4745A-TP, maintains identical electrical specifications across the critical parameters: 16 V nominal Zener voltage, ±5% tolerance, 1 W maximum power rating, 16 Ohms maximum impedance, and 5 µA reverse leakage current at 12.2 V. Both parts are manufactured by Micro Commercial Co and share the same base product number series (4745).

The key differentiator between these parts is the package format. The DL4745A-TP uses a MELF (DO-213AB) package, while the SMAJ4745A-TP uses a DO-214AC (SMA) package. Both are surface mount configurations suitable for automated assembly. The substitute part operates across a temperature range of -65°C to 150°C, which encompasses the lower end of the main part's operating range but does not extend to the full 175°C maximum.

Substitution is valid when circuit design requirements do not mandate the extended upper temperature limit of 175°C and when PCB layout can accommodate the DO-214AC package footprint.

Parameter Comparison

Engineering Selection Recommendations

The SMAJ4745A-TP is the direct electrical equivalent to the DL4745A-TP and is the appropriate substitute for applications where the DL4745A-TP is no longer available. The substitute part carries Active product status, ensuring continued availability and supply chain reliability.

Both parts maintain ROHS3 compliance and carry identical moisture sensitivity ratings, eliminating compliance concerns during substitution. The substitute part's lower maximum operating temperature (150°C versus 175°C) must be evaluated against actual circuit operating conditions. Applications operating continuously above 150°C require retention of the original DL4745A-TP specification or identification of alternative sources.

The package change from MELF to SMA requires PCB layout modification. The DO-214AC (SMA) package is a standard surface mount format with established footprint definitions and is widely supported in PCB design libraries.

Frequently Asked Questions (FAQ)

Q: Can SMAJ4745A-TP directly replace DL4745A-TP without circuit modification?

A: Electrical substitution is direct. The Zener voltage, power rating, impedance, and leakage current specifications are identical. PCB layout modification is required due to package format differences (MELF to SMA).

Q: What is the primary difference between these two parts?

A: The DL4745A-TP uses a MELF package with an operating temperature range to 175°C. The SMAJ4745A-TP uses a DO-214AC (SMA) package with an operating temperature range to 150°C. Electrical performance is equivalent.

Q: Is the temperature range difference significant for substitution?

A: The temperature range difference is significant only for applications requiring sustained operation above 150°C. Standard industrial and commercial applications operating within -65°C to 150°C are unaffected.

Q: Are there any compliance or certification differences?

A: Both parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity ratings. No compliance barriers exist for substitution.

Q: What is the forward voltage difference between these parts?

A: The DL4745A-TP specifies 1.2 V maximum at 200 mA forward current. The SMAJ4745A-TP specifies 1.2 V maximum at 100 mA forward current. Both maintain the same maximum forward voltage specification at their respective rated currents.

Q: Is the SMAJ4745A-TP available in higher quantities?

A: The SMAJ4745A-TP carries 16,178 pieces in stock versus 1,036 pieces for the obsolete DL4745A-TP, providing superior supply chain availability.

Q: Can I use SMAJ4745A-TP in existing designs without redesign?

A: Electrical substitution is direct. Physical PCB redesign is required to accommodate the different package footprint (SMA versus MELF).