DL5240B-TP Equivalent & Substitute Parts

Part Overview

The DL5240B-TP is a Zener diode rated at 10 V nominal voltage with 500 mW maximum power dissipation, manufactured by Micro Commercial Co in a Mini MELF surface mount package. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The part maintains ROHS3 compliance and unlimited moisture sensitivity rating, making it suitable for industrial and commercial applications across the specified operating temperature range of -65°C to 175°C.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	10	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	17	Ohms
Current - Reverse Leakage @ Vr	3	µA @ 8 V
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the DL5240B-TP is determined by electrical parameter equivalence across the following criteria:

Electrical Equivalence Requirements:

Zener voltage: 10 V nominal with ±5% tolerance
Maximum power dissipation: 500 mW
Maximum impedance: 17 Ohms
Reverse leakage current: 3 µA @ 8 V
Surface mount technology

Compliance Requirements:

ROHS3 compliance maintained
Moisture sensitivity level 1 (unlimited)
REACH unaffected status

The MMSZ5240B-TP meets all electrical specifications and compliance requirements. The primary difference is packaging format: the substitute uses SOD-123 instead of Mini MELF (DO-213AC). This packaging change requires physical board layout modification but does not affect electrical performance within the specified parameters.

Parameter Comparison

Parameter	DL5240B-TP (Main)	MMSZ5240B-TP (Substitute)	Match Status
Voltage - Zener (Nom)	10 V	10 V	Equivalent
Tolerance	±5%	±5%	Equivalent
Power - Max	500 mW	500 mW	Equivalent
Impedance (Max)	17 Ohms	17 Ohms	Equivalent
Current - Reverse Leakage @ Vr	3 µA @ 8 V	3 µA @ 8 V	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Package / Case	DO-213AC, MINI-MELF, SOD-80	SOD-123	Different
Operating Temperature	-65°C ~ 175°C	-55°C ~ 150°C	Reduced Range
Product Status	Obsolete	Active	Active Available
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

The MMSZ5240B-TP is the direct electrical equivalent for the obsolete DL5240B-TP. All critical electrical parameters—zener voltage, power rating, impedance, and leakage current—are identical. Both components maintain ROHS3 compliance and unlimited moisture sensitivity rating.

Selection Considerations:

The substitute part is currently in active production status with substantial inventory availability (48,077 pcs), compared to the obsolete main part (4,242 pcs remaining stock). This ensures long-term procurement viability for new designs and production continuity.

The operating temperature range of the substitute (-55°C to 150°C) is narrower than the main part (-65°C to 175°C). Applications requiring operation below -55°C or above 150°C must retain the original DL5240B-TP or identify alternative sources.

Package format change from Mini MELF to SOD-123 requires board layout modification. SOD-123 is a smaller package with different footprint dimensions and lead configuration. PCB redesign and component placement verification are necessary before implementation.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5240B-TP directly replace DL5240B-TP without circuit modification?

A: Electrical substitution is valid. All zener voltage, power rating, impedance, and leakage specifications are identical. Physical board layout modification is required due to package format change from Mini MELF to SOD-123.

Q: What is the primary reason for substitution?

A: The DL5240B-TP is classified as obsolete. The MMSZ5240B-TP is an active production equivalent with identical electrical specifications and superior inventory availability.

Q: Are there temperature range limitations with the substitute?

A: The MMSZ5240B-TP operates from -55°C to 150°C, compared to the original -65°C to 175°C range. Applications requiring extended temperature operation must evaluate alternative sources or retain original stock.

Q: Do both parts meet the same compliance standards?

A: Yes. Both DL5240B-TP and MMSZ5240B-TP are ROHS3 compliant, REACH unaffected, and carry unlimited moisture sensitivity rating (MSL 1).

Q: What is the difference between Mini MELF and SOD-123 packages?

A: Mini MELF (DO-213AC) and SOD-123 are distinct surface mount package formats with different physical dimensions, footprint patterns, and lead configurations. PCB design changes are required for package conversion.

Q: Is the substitute part readily available?

A: Yes. The MMSZ5240B-TP is in active production with 48,077 pcs in stock, providing reliable procurement for current and future applications.

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