DL5249B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The DL5249B-TP is a 19 V, 500 mW Zener diode 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. The part maintains ROHS3 compliance and unlimited moisture sensitivity rating, making it suitable for industrial and commercial applications requiring voltage regulation and transient protection.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	19 V
Power - Max	500 mW
Tolerance	±5%
Impedance (Max)	23 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 14 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	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DL5249B-TP is determined by the following critical parameters: nominal Zener voltage of 19 V, maximum power dissipation of 500 mW, voltage tolerance of ±5%, impedance specification of 23 Ohms maximum, reverse leakage current of 100 nA at 14 V, forward voltage of 1.1 V at 200 mA, and operating temperature range of -65°C to 175°C. Surface mount mounting type and package compatibility are secondary considerations that may vary between substitutes.

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalent: Parts that maintain identical electrical specifications and operating temperature range while potentially differing in package format or manufacturer.

Parametric Equivalent: Parts that satisfy all critical electrical parameters but may have different package configurations or slightly different operating temperature ranges, provided the specified range encompasses the application requirements.

Parameter Comparison

Parameter	DL5249B-TP	MMSZ5249B-TP	1N5249BUR-1	TZM5249B-GS08	TZM5249B-GS18
Manufacturer	Micro Commercial Co	Micro Commercial Co	Microchip Technology	Vishay General Semiconductor	Vishay General Semiconductor
Voltage - Zener (Nom)	19 V	19 V	19 V	19 V	19 V
Power - Max	500 mW	500 mW	500 mW	500 mW	500 mW
Tolerance	±5%	±5%	±5%	±5%	±5%
Impedance (Max)	23 Ohms	Not specified	23 Ohms	23 Ohms	23 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 14 V	Not specified	100 nA @ 14 V	100 nA @ 14 V	100 nA @ 14 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	Not specified	1.1 V @ 200 mA	1.1 V @ 200 mA	1.1 V @ 200 mA
Operating Temperature Range	-65°C ~ 175°C	-55°C ~ 150°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80	SOD-123	DO-213AA	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Not specified	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Preferred Substitutes (Full Electrical and Compliance Match):

The TZM5249B-GS08 and TZM5249B-GS18 manufactured by Vishay General Semiconductor are the primary recommended substitutes. Both parts satisfy all critical electrical parameters including 19 V nominal Zener voltage, 500 mW power rating, ±5% tolerance, 23 Ohms maximum impedance, 100 nA reverse leakage current, and 1.1 V forward voltage specification. Both maintain the full -65°C to 175°C operating temperature range and are ROHS3 compliant with unlimited moisture sensitivity rating. The primary difference between these two Vishay parts is packaging configuration (tape and reel variants). Both are currently in active production status with substantial inventory availability.

Secondary Substitute (Electrical Match with Package Variation):

The 1N5249BUR-1 manufactured by Microchip Technology provides complete electrical parameter equivalence with identical operating temperature range and all specified electrical characteristics. However, this part carries RoHS non-compliant status, which may restrict use in applications requiring RoHS compliance. The package format is DO-213AA rather than Mini MELF.

Alternative Substitute (Electrical Match with Temperature Range Limitation):

The MMSZ5249B-TP manufactured by Micro Commercial Co maintains the same manufacturer as the original part and provides 19 V, 500 mW specifications with ±5% tolerance. However, this part operates over a reduced temperature range of -55°C to 150°C compared to the original -65°C to 175°C specification. The package format is SOD-123. Detailed electrical parameters including impedance and reverse leakage current are not specified for this part. This substitute is suitable only for applications where the reduced temperature range is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the MMSZ5249B-TP be used as a direct replacement for the DL5249B-TP?

A: The MMSZ5249B-TP shares the same 19 V nominal voltage and 500 mW power rating with ±5% tolerance. However, the operating temperature range is reduced to -55°C to 150°C compared to the original -65°C to 175°C. Use this substitute only if your application operates within the narrower temperature range. The package format also differs (SOD-123 versus Mini MELF).

Q: What is the difference between TZM5249B-GS08 and TZM5249B-GS18?

A: Both parts are manufactured by Vishay and provide identical electrical specifications and operating temperature range. The primary difference is the packaging configuration: GS08 and GS18 represent different tape and reel packaging variants. Selection between these two depends on your procurement and assembly requirements rather than electrical performance.

Q: Why is the 1N5249BUR-1 marked as RoHS non-compliant?

A: The 1N5249BUR-1 does not meet ROHS3 compliance requirements. If your application or regulatory environment mandates RoHS compliance, this part is not suitable. The Vishay TZM5249B series and MMSZ5249B-TP alternatives are ROHS3 compliant.

Q: Are all substitute parts surface mount components?

A: Yes, all substitute parts listed are surface mount devices. The DL5249B-TP and all recommended substitutes use surface mount technology. Package formats vary between Mini MELF (SOD-80), SOD-123, and DO-213AA/DO-213AC, but all are surface mount configurations.

Q: What are the key electrical parameters that must match for substitution?

A: The critical parameters for Zener diode substitution are: nominal Zener voltage (19 V), maximum power dissipation (500 mW), voltage tolerance (±5%), impedance (23 Ohms maximum), reverse leakage current (100 nA @ 14 V), and forward voltage (1.1 V @ 200 mA). Operating temperature range and compliance certifications are secondary considerations that may vary based on application requirements.

Q: Can I use a substitute part with a different package format?

A: Package format changes require PCB layout modifications and assembly process adjustments. While electrical performance remains equivalent, physical dimensions and land patterns differ between Mini MELF, SOD-123, and DO-213AA packages. Confirm PCB compatibility and assembly capability before implementing a package format change.

Q: Is inventory availability a factor in selecting a substitute?

A: Inventory levels are provided for reference. The TZM5249B-GS08 has the highest inventory availability at 5520 pieces. However, inventory status may change over time. Verify current availability with your component supplier for production planning purposes.

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