DL5238B-TP Equivalent & Substitute Parts

Part Overview

The DL5238B-TP is a Zener diode manufactured by Micro Commercial Co, rated at 8.7 V nominal with 500 mW maximum power dissipation. This component is packaged in the DO-213AC Mini MELF surface mount configuration and is designed for voltage regulation and protection applications in electronic circuits. The part is currently classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support, maintenance, and production continuity.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	8.7 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max) (Zzt)	8 Ohms
Current - Reverse Leakage @ Vr	3 µA @ 6.5 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA
Operating Temperature Range	-65°C ~ 175°C
Mounting Type	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DL5238B-TP is determined by strict equivalence across the following critical parameters:

Zener Voltage (Vz): 8.7 V nominal with ±5% tolerance
Power Rating: 500 mW maximum dissipation
Impedance (Zzt): 8 Ohms maximum
Reverse Leakage Current: 3 µA @ 6.5 V
Operating Temperature Range: -65°C to 175°C
Mounting Configuration: Surface mount in DO-213AC / Mini MELF / SOD-80 package
Regulatory Compliance: ROHS3 compliance and MSL Level 1

All identified substitute parts meet these electrical and mechanical specifications. Variations in forward voltage (Vf) and packaging format (tape & reel versus bulk) do not disqualify parts from substitution when all primary parameters align.

Parameter Comparison

Parameter	DL5238B-TP	TZM5238B-GS08	TZM5238B-GS18	ZMM5238B-7
Manufacturer	Micro Commercial Co	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Diodes Incorporated
Voltage - Zener (Nom) (Vz)	8.7 V	8.7 V	8.7 V	8.7 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW
Impedance (Max) (Zzt)	8 Ohms	8 Ohms	8 Ohms	8 Ohms
Current - Reverse Leakage @ Vr	3 µA @ 6.5 V	3 µA @ 6.5 V	3 µA @ 6.5 V	3 µA @ 6.5 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature Range	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80
Product Status	Obsolete	Active	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

The TZM5238B-GS08 and TZM5238B-GS18 manufactured by Vishay General Semiconductor - Diodes Division are the preferred substitutes for the obsolete DL5238B-TP. Both parts maintain active product status, ensuring long-term availability and supply chain continuity. These components are supplied in tape & reel packaging format and are fully compliant with ROHS3 and REACH requirements. Electrical parameters are identical to the DL5238B-TP across all critical specifications.

Secondary Substitute (Obsolete Status):

The ZMM5238B-7 manufactured by Diodes Incorporated is an electrical equivalent but carries obsolete product status. This part is suitable for legacy system support and maintenance applications where existing inventory exists. The forward voltage specification (1.5 V @ 200 mA) differs from the primary part and substitutes, which may affect circuit performance in forward-biased applications. REACH status is listed as affected, requiring compliance verification for specific regulatory jurisdictions.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard surface mount assembly processes and storage requirements. Selection between active and obsolete alternatives depends on production timeline requirements and long-term supply chain strategy.

Frequently Asked Questions (FAQ)

Q: Can TZM5238B-GS08 and TZM5238B-GS18 be used interchangeably with DL5238B-TP?

A: Yes. Both Vishay parts are parametric equivalents with identical electrical specifications across zener voltage, power rating, impedance, reverse leakage current, and operating temperature range. The primary difference is packaging format (tape & reel versus bulk) and active product status, which supports long-term availability.

Q: What is the significance of the forward voltage difference in ZMM5238B-7?

A: The ZMM5238B-7 specifies a maximum forward voltage of 1.5 V @ 200 mA, compared to 1.1 V @ 200 mA for the DL5238B-TP and Vishay substitutes. This 0.4 V difference affects forward-biased circuit operation and power dissipation calculations. Substitution is valid for zener regulation applications but requires circuit analysis for forward-biased scenarios.

Q: Are there packaging differences between substitute parts?

A: All parts use the DO-213AC / Mini MELF / SOD-80 surface mount package. The TZM5238B-GS08 and TZM5238B-GS18 are supplied in tape & reel format, while DL5238B-TP and ZMM5238B-7 are supplied in bulk packaging. Both formats are compatible with standard pick-and-place assembly equipment.

Q: Why is DL5238B-TP classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Active substitutes (TZM5238B-GS08 and TZM5238B-GS18) are available from Vishay and provide equivalent functionality with ongoing supply chain support.

Q: Do all substitute parts meet the same regulatory requirements?

A: All parts are ROHS3 compliant and MSL Level 1 rated. The ZMM5238B-7 carries REACH Affected status, while DL5238B-TP and Vishay parts are REACH Unaffected. Regulatory requirements vary by application and jurisdiction; compliance verification is necessary for specific end-use applications.

Q: What is the impedance specification and why does it matter?

A: Maximum impedance (Zzt) is specified at 8 Ohms for all parts. This parameter defines the dynamic resistance of the zener diode at the specified test current and affects voltage regulation stability and transient response in protection circuits.

Q: Can these parts be used in high-temperature applications?

A: Yes. All parts are rated for -65°C to 175°C operating temperature range, supporting extended temperature applications. Thermal management and power dissipation calculations remain necessary for sustained operation at elevated temperatures.

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