DL5242B-TP Equivalent & Substitute Parts

Part Overview

The DL5242B-TP is a Zener diode rated at 12 V with 500 mW power dissipation in a Mini MELF surface mount package. Manufactured by Micro Commercial Co, this component is classified as obsolete. Due to its obsolete status and limited availability, equivalent substitute parts are necessary to maintain design continuity and ensure procurement reliability for new production runs and field replacements.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	12 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max)	30 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 9.1 V
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DL5242B-TP is determined by electrical parameter equivalence and mechanical compatibility. All substitute parts must satisfy the following criteria:

Electrical Parameters (Critical):

Zener voltage: 12 V nominal
Tolerance: ±5%
Power rating: 500 mW
Impedance (Max): 30 Ohms
Reverse leakage current: 1 µA @ 9.1 V

Mechanical Parameters:

Mounting type: Surface Mount
Package compatibility with circuit board design

Compliance Parameters:

RoHS3 compliance status
REACH unaffected status

The substitute parts MMSZ5242B-TP and 1N5242BUR-1 meet all electrical specifications. Package differences (Mini MELF vs. SOD-123 vs. DO-213AA) require circuit board layout verification but do not affect electrical performance when properly integrated.

Parameter Comparison

Parameter	DL5242B-TP	MMSZ5242B-TP	1N5242BUR-1
Manufacturer	Micro Commercial Co	Micro Commercial Co	Microchip Technology
Voltage - Zener (Nom)	12 V	12 V	12 V
Tolerance	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW
Impedance (Max)	30 Ohms	30 Ohms	30 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 9.1 V	1 µA @ 9.1 V	1 µA @ 9.1 V
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80	SOD-123	DO-213AA
Operating Temperature	-65°C ~ 175°C	-55°C ~ 150°C	-65°C ~ 175°C
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

MMSZ5242B-TP (Micro Commercial Co): This substitute is electrically identical to the DL5242B-TP across all critical parameters. It maintains ROHS3 compliance and is currently in active production status with 4400 units in stock. The primary difference is the package format (SOD-123 versus Mini MELF). This substitute is suitable for new designs and production runs where PCB layout can accommodate the SOD-123 footprint.

1N5242BUR-1 (Microchip Technology): This substitute meets all electrical specifications and maintains the same operating temperature range (-65°C ~ 175°C) as the original DL5242B-TP. However, it is RoHS non-compliant, which may restrict its use in applications subject to RoHS regulations. The DO-213AA package is mechanically similar to Mini MELF. This substitute is available in limited quantity (937 units) and is suitable only for applications where RoHS compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5242B-TP be used as a direct replacement for DL5242B-TP?

A: MMSZ5242B-TP is electrically equivalent and meets all electrical specifications. However, it uses a different package format (SOD-123 instead of Mini MELF). Direct PCB substitution requires footprint compatibility verification. If the circuit board is designed for Mini MELF, the SOD-123 package will not fit without layout modification.

Q: What is the difference between the operating temperature ranges?

A: DL5242B-TP and 1N5242BUR-1 both operate from -65°C to 175°C. MMSZ5242B-TP has a narrower range of -55°C to 150°C. For applications requiring operation below -55°C or above 150°C, MMSZ5242B-TP is not suitable.

Q: Why is 1N5242BUR-1 marked as RoHS non-compliant?

A: The 1N5242BUR-1 does not meet ROHS3 compliance requirements. Applications subject to RoHS regulations (EU Directive 2011/65/EU or equivalent) cannot use this part. MMSZ5242B-TP is the compliant alternative.

Q: Are all three parts electrically interchangeable?

A: Yes, all three parts have identical electrical specifications: 12 V zener voltage, ±5% tolerance, 500 mW power rating, 30 Ohms maximum impedance, and 1 µA reverse leakage current at 9.1 V. Interchangeability is limited only by package format and compliance requirements.

Q: What should be verified before selecting a substitute?

A: Verify PCB footprint compatibility with the selected package format (Mini MELF, SOD-123, or DO-213AA). Confirm RoHS compliance requirements for the application. Validate operating temperature range requirements. Confirm availability and lead time from the selected manufacturer.

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