DL4740A-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The DL4740A-TP is a 10 V, 1 W surface mount zener diode manufactured by Micro Commercial Co in MELF (DO-213AB) package configuration. This component is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. The part maintains ROHS3 compliance and unlimited moisture sensitivity rating, making it suitable for industrial and commercial applications across the -65°C to 175°C operating temperature range.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	10	V
Tolerance	±5	%
Power - Maximum	1	W
Impedance (Maximum)	7	Ohms
Current - Reverse Leakage @ Vr	10	µA @ 7.6 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 DL4740A-TP is determined by the following critical parameters: zener voltage (10 V nominal), power rating (1 W maximum), impedance specification (7 Ohms maximum), reverse leakage current (10 µA @ 7.6 V), and forward voltage characteristics (1.2 V @ 200 mA). All identified substitutes maintain these core electrical specifications within the stated tolerances.

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

MELF Package Group (DO-213AB): Parts maintaining identical MELF surface mount package geometry, enabling direct PCB footprint compatibility without layout modification.

SMA Package Group (DO-214AC): Parts utilizing alternative surface mount package configuration, requiring PCB footprint redesign but offering equivalent electrical performance and active product status.

Parameter Comparison

Parameter	DL4740A-TP	SMAJ4740A-TP	GLL4740A-E3/96	1N4740AUR/TR
Manufacturer	Micro Commercial Co	Micro Commercial Co	Vishay General Semiconductor	Microchip Technology
Voltage - Zener (Nom)	10 V	10 V	10 V	10 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	1 W	1 W	1 W	1 W
Impedance (Max)	7 Ohms	7 Ohms	7 Ohms	7 Ohms
Current - Reverse Leakage @ Vr	10 µA @ 7.6 V	10 µA @ 7.6 V	10 µA @ 7.6 V	10 µA @ 7.6 V
Voltage - Forward (Max) @ If	1.2 V @ 200 mA	1.2 V @ 100 mA	Not specified	1.2 V @ 200 mA
Operating Temperature	-65 to 175°C	-65 to 150°C	-65 to 150°C	-65 to 175°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AB, MELF	DO-214AC, SMA	DO-213AB, MELF	DO-213AB, MELF
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Footprint Replacement (MELF Package):

The GLL4740A-E3/96 manufactured by Vishay General Semiconductor and the 1N4740AUR/TR manufactured by Microchip Technology both maintain DO-213AB MELF package compatibility with the DL4740A-TP. Both alternatives are active products with ROHS3 compliance. The GLL4740A-E3/96 offers the highest inventory availability (65,593 units) and unlimited moisture sensitivity rating. The 1N4740AUR/TR maintains the full -65°C to 175°C operating temperature range matching the original part specification.

For Alternative Package Configuration (SMA Package):

The SMAJ4740A-TP manufactured by Micro Commercial Co provides electrical equivalence with active product status and ROHS3 compliance. This part utilizes DO-214AC (SMA) surface mount package, requiring PCB layout modification. Operating temperature range is -65°C to 150°C. Forward voltage specification differs at 1.2 V @ 100 mA versus the original 1.2 V @ 200 mA.

Compliance and Regulatory Considerations:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's regulatory posture. ECCN classification (EAR99) and HTSUS code (8541.10.0050) remain consistent across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can SMAJ4740A-TP replace DL4740A-TP without PCB modification?

A: No. SMAJ4740A-TP uses DO-214AC (SMA) package while DL4740A-TP uses DO-213AB (MELF) package. These packages have different footprints and cannot occupy the same PCB location without layout redesign.

Q: What is the primary difference between GLL4740A-E3/96 and 1N4740AUR/TR?

A: Both parts maintain identical electrical specifications and MELF package compatibility. The primary difference is operating temperature range: GLL4740A-E3/96 operates -65°C to 150°C, while 1N4740AUR/TR operates -65°C to 175°C, matching the original DL4740A-TP specification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitute parts (SMAJ4740A-TP, GLL4740A-E3/96, and 1N4740AUR/TR) maintain ROHS3 compliance and REACH unaffected status.

Q: What does the ±5% tolerance specification mean?

A: The zener voltage nominal value of 10 V carries a ±5% tolerance, indicating the actual zener voltage will fall between 9.5 V and 10.5 V across the specified operating temperature range and production lot variations.

Q: Which substitute part has the highest inventory availability?

A: GLL4740A-E3/96 has 65,593 units in stock, significantly exceeding availability of SMAJ4740A-TP (7,268 units) and 1N4740AUR/TR (989 units).

Q: Can forward voltage differences between substitutes affect circuit performance?

A: Forward voltage specifications apply to forward bias operation. In zener diode voltage regulation applications, the diode operates in reverse bias mode where zener voltage characteristics dominate. Forward voltage differences are not relevant to typical zener regulation circuits.

Q: What is the significance of the 7 Ohms impedance specification?

A: Impedance (Zzt) of 7 Ohms maximum defines the dynamic resistance of the zener diode in the reverse bias region. This parameter affects voltage regulation quality and load response characteristics. All substitutes maintain this specification.

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