DL5231B-TP Equivalent & Substitute Parts

Part Overview

The DL5231B-TP is a Zener diode rated at 5.1 V nominal voltage with 500 mW power dissipation, manufactured by Micro Commercial Co in a Mini MELF surface mount package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. Equivalent parts maintain identical electrical specifications and performance characteristics, while substitute parts provide functional alternatives with modified package configurations or operational parameters within acceptable tolerance ranges.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	5.1	V
Tolerance	±5%	%
Power - Max	500	mW
Impedance (Max)	17	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 2 V
Voltage - Forward (Vf) (Max) @ If	1.1	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Surface Mount	—
Package / Case	DO-213AC, MINI-MELF, SOD-80	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the DL5231B-TP is determined by strict equivalence of the following critical electrical parameters: nominal Zener voltage (5.1 V), voltage tolerance (±5%), maximum power dissipation (500 mW), impedance (17 Ohms maximum), reverse leakage current (5 µA @ 2 V), and forward voltage characteristics (1.1 V @ 200 mA). All substitute parts must maintain surface mount mounting type and operate within the specified temperature range or an extended range that encompasses the original specification.

Substitutes are grouped into two categories:

Similar Manufacturer Part (Package Variant): MMSZ5231B-TP maintains all critical electrical parameters but uses a SOD-123 package instead of Mini MELF. This part is active in production and represents a direct functional equivalent with modified form factor.

Direct Manufacturer Part (Package Equivalent): 1N5231BUR-1 maintains all critical electrical parameters including forward voltage characteristics and operating temperature range, using a DO-213AA package. This part is active in production and represents a direct functional equivalent with identical electrical performance.

Parameter Comparison

Parameter	DL5231B-TP (Main)	MMSZ5231B-TP (Similar)	1N5231BUR-1 (Direct)
Manufacturer	Micro Commercial Co	Micro Commercial Co	Microchip Technology
Voltage - Zener (Nom)	5.1 V	5.1 V	5.1 V
Tolerance	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW
Impedance (Max)	17 Ohms	17 Ohms	17 Ohms
Current - Reverse Leakage @ Vr	5 µA @ 2 V	5 µA @ 2 V	5 µA @ 2 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	900 mV @ 10 mA	1.1 V @ 200 mA
Operating Temperature Range	-65°C to 175°C	-55°C to 150°C	-65°C to 175°C
Package / Case	DO-213AC, MINI-MELF, SOD-80	SOD-123	DO-213AA
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant

Engineering Selection Recommendations

For applications requiring identical electrical performance and extended temperature range: The 1N5231BUR-1 from Microchip Technology provides direct equivalence with the DL5231B-TP, maintaining the full -65°C to 175°C operating temperature range and identical forward voltage characteristics. This part is active in production. Note that 1N5231BUR-1 is RoHS non-compliant; applications subject to RoHS requirements must use alternative selections.

For applications with reduced temperature range requirements: The MMSZ5231B-TP from Micro Commercial Co maintains all critical electrical parameters with a reduced operating temperature range of -55°C to 150°C. This part is active in production and ROHS3 compliant. The SOD-123 package requires PCB layout modification compared to the Mini MELF original. Forward voltage is specified at different test conditions (900 mV @ 10 mA versus 1.1 V @ 200 mA).

For RoHS-compliant applications: Only the MMSZ5231B-TP meets ROHS3 compliance requirements among active production alternatives.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5231B-TP directly replace DL5231B-TP without PCB modification?

A: No. MMSZ5231B-TP uses SOD-123 package while DL5231B-TP uses Mini MELF (DO-213AC). These packages have different footprints and land patterns. PCB layout modification is required.

Q: What is the difference in forward voltage specifications between DL5231B-TP and MMSZ5231B-TP?

A: DL5231B-TP specifies 1.1 V maximum at 200 mA forward current. MMSZ5231B-TP specifies 900 mV maximum at 10 mA forward current. These are measured at different test conditions and represent equivalent performance characteristics for the respective package types.

Q: Is 1N5231BUR-1 suitable for applications requiring RoHS compliance?

A: No. 1N5231BUR-1 is RoHS non-compliant. For RoHS-compliant applications, use MMSZ5231B-TP.

Q: What is the temperature range limitation of MMSZ5231B-TP compared to the original DL5231B-TP?

A: MMSZ5231B-TP operates from -55°C to 150°C, while DL5231B-TP operates from -65°C to 175°C. Applications requiring operation below -55°C or above 150°C must use 1N5231BUR-1.

Q: Are all three parts electrically equivalent for Zener voltage and power dissipation?

A: Yes. All three parts maintain 5.1 V nominal Zener voltage, ±5% tolerance, 500 mW maximum power dissipation, 17 Ohms maximum impedance, and 5 µA reverse leakage current at 2 V. Differences exist only in package configuration, temperature range, and forward voltage test conditions.

Q: Which substitute part should be selected for new designs?

A: Selection depends on application requirements. For RoHS compliance and active production status, use MMSZ5231B-TP. For extended temperature range and identical electrical characteristics, use 1N5231BUR-1. Verify package compatibility with PCB layout before final selection.

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