DL4750A-TP Equivalent & Substitute Parts

Part Overview

The DL4750A-TP is a Zener diode rated at 27 V, 1 W with ±5% tolerance, manufactured by Micro Commercial Co in a Surface Mount MELF (DO-213AB) package. This component is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain identical electrical specifications while accommodating different package configurations and manufacturer sourcing options.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	27	V
Tolerance	±5	%
Power - Maximum	1	W
Impedance (Maximum)	35	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 20.6 V
Voltage - Forward (Maximum) @ If	1.2	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Surface Mount	—
Package / Case	DO-213AB, MELF	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the DL4750A-TP is determined by the following critical parameters:

Electrical Equivalence Criteria:

Voltage - Zener (Nominal): 27 V
Tolerance: ±5%
Power - Maximum: 1 W
Impedance (Maximum): 35 Ohms
Current - Reverse Leakage @ Vr: 5 µA @ 20.6 V
Voltage - Forward (Maximum) @ If: 1.2 V @ 200 mA

Mechanical & Environmental Criteria:

Mounting Type: Surface Mount
Operating Temperature Range: -65°C to 175°C (minimum requirement)
RoHS Compliance: ROHS3 Compliant

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

Category 1 - Direct Package Match (DO-213AB MELF): Parts maintaining the original MELF package footprint for direct PCB replacement without layout modification.

Category 2 - Alternative Package (DO-214AC SMA): Parts with equivalent electrical specifications but different surface mount package, requiring PCB footprint adjustment.

Parameter Comparison

Parameter	DL4750A-TP	SMAJ4750A-TP	1N4750AUR/TR
Manufacturer	Micro Commercial Co	Micro Commercial Co	Microchip Technology
Product Status	Obsolete	Active	Active
Voltage - Zener (Nominal)	27 V	27 V	27 V
Tolerance	±5%	±5%	±5%
Power - Maximum	1 W	1 W	1 W
Impedance (Maximum)	35 Ohms	35 Ohms	35 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 20.6 V	5 µA @ 20.6 V	5 µA @ 20.6 V
Voltage - Forward (Maximum) @ If	1.2 V @ 200 mA	1.2 V @ 100 mA	1.2 V @ 200 mA
Operating Temperature Range	-65 to 175°C	-65 to 150°C	-65 to 175°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AB, MELF	DO-214AC, SMA	DO-213AB, MELF
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

1N4750AUR/TR (Microchip Technology)

This part is the primary substitute for DL4750A-TP applications. It maintains identical electrical specifications including the 27 V nominal zener voltage, 1 W power rating, 35 Ohms maximum impedance, and 5 µA reverse leakage current. The package configuration (DO-213AB MELF) matches the original part exactly, enabling direct PCB replacement without layout modification. Operating temperature range extends to 175°C, matching the original specification. Product status is active with 738 units in stock. RoHS3 compliance and REACH unaffected status align with regulatory requirements.

SMAJ4750A-TP (Micro Commercial Co)

This part provides electrical equivalence with identical zener voltage, tolerance, power rating, and impedance specifications. However, the DO-214AC (SMA) package differs from the original MELF configuration, requiring PCB footprint redesign. Operating temperature range is limited to 150°C, which is 25°C below the original specification. Forward voltage specification differs at 1.2 V @ 100 mA versus 1.2 V @ 200 mA on the original part. This substitute is suitable for new designs where package footprint flexibility exists. Product status is active with 7100 units in stock.

Frequently Asked Questions (FAQ)

Q: Can SMAJ4750A-TP be used as a direct replacement for DL4750A-TP on existing PCBs?

A: No. SMAJ4750A-TP uses a DO-214AC (SMA) package while DL4750A-TP uses DO-213AB (MELF). These packages have different footprints and cannot be substituted without PCB layout modification. 1N4750AUR/TR maintains the identical MELF package and is suitable for direct PCB replacement.

Q: What is the temperature operating range difference between the substitutes?

A: DL4750A-TP and 1N4750AUR/TR both operate from -65°C to 175°C. SMAJ4750A-TP operates from -65°C to 150°C, representing a 25°C reduction in maximum operating temperature. Applications requiring operation above 150°C must use 1N4750AUR/TR.

Q: Are all three parts RoHS3 compliant?

A: Yes. DL4750A-TP, SMAJ4750A-TP, and 1N4750AUR/TR are all ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.

Q: What is the significance of the forward voltage specification difference?

A: DL4750A-TP and 1N4750AUR/TR specify 1.2 V @ 200 mA forward voltage, while SMAJ4750A-TP specifies 1.2 V @ 100 mA. Both meet the 1.2 V maximum at their respective test currents. This difference reflects measurement methodology rather than functional incompatibility for zener diode applications.

Q: Which substitute has the best inventory availability?

A: SMAJ4750A-TP has 7100 units in stock, compared to 1N4750AUR/TR with 738 units. However, inventory availability should not override package compatibility and temperature range requirements for critical applications.

Q: Can these parts be used interchangeably in voltage regulation circuits?

A: 1N4750AUR/TR is the direct functional equivalent with matching package and temperature range. SMAJ4750A-TP requires PCB redesign due to package differences and has a reduced maximum operating temperature of 150°C. Selection depends on circuit requirements and PCB layout constraints.

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