DL5248B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The DL5248B-TP is an 18 V, 500 mW surface mount zener diode manufactured by Micro Commercial Co in Mini MELF packaging. This component is classified as obsolete, indicating discontinued production and limited availability. The part is supplied in Tape & Reel packaging format with 2086 pieces currently in stock. Identification of equivalent and substitute parts is necessary due to the obsolete product status and potential future supply constraints. Substitute components must maintain electrical equivalence across voltage regulation, power dissipation, and thermal characteristics while accommodating different package formats and manufacturing sources.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	18	V
Tolerance	±5	%
Power - Maximum	500	mW
Impedance (Maximum)	21	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 14 V
Voltage - Forward (Maximum) @ 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 DL5248B-TP is determined by strict electrical and mechanical parameter matching. The following criteria establish valid equivalence:

Electrical Equivalence Requirements:

Voltage - Zener (Nominal): 18 V
Tolerance: ±5%
Power - Maximum: 500 mW
Impedance (Maximum): 21 Ohms
Current - Reverse Leakage @ Vr: 100 nA @ 14 V

Mechanical Compatibility Considerations:

Mounting Type: Surface Mount
Package / Case formats: DO-213AC, MINI-MELF, SOD-80, or SOD-123
Supplier Device Package: Mini MELF, SOD-123, or SOD-80

Compliance Requirements:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

All identified substitute parts maintain the core electrical specifications. Variations in forward voltage characteristics and operating temperature ranges are secondary parameters that do not preclude substitution when primary electrical parameters are matched. Package format differences (Mini MELF versus SOD-123 versus SOD-80) require board-level design verification but do not affect electrical function.

Parameter Comparison

Parameter	DL5248B-TP (Main)	MMSZ5248B-TP	CLL5248B BK PBFREE	CLL5248B TR PBFREE
Manufacturer	Micro Commercial Co	Micro Commercial Co	Central Semiconductor Corp	Central Semiconductor Corp
Voltage - Zener (Nom)	18 V	18 V	18 V	18 V
Tolerance	±5%	±5%	±5%	±5%
Power - Max	500 mW	500 mW	500 mW	500 mW
Impedance (Max)	21 Ohms	21 Ohms	21 Ohms	21 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 14 V	100 nA @ 14 V	100 nA @ 14 V	100 nA @ 14 V
Voltage - Forward (Max) @ If	1.1 V @ 200 mA	900 mV @ 10 mA	1.25 V @ 200 mA	1.25 V @ 200 mA
Operating Temperature	-65°C to 175°C	-55°C to 150°C	-65°C to 200°C	-65°C to 200°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80	SOD-123	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

MMSZ5248B-TP (Micro Commercial Co)

This substitute maintains identical electrical specifications and originates from the same manufacturer as the main part. The component is in active production status, ensuring long-term availability. The primary design consideration is package format: MMSZ5248B-TP uses SOD-123 packaging instead of Mini MELF. This package change requires verification of board layout compatibility, including footprint dimensions and land pattern specifications. All compliance certifications (ROHS3, MSL 1) are maintained. Operating temperature range is reduced to -55°C to 150°C compared to the main part's -65°C to 175°C; this narrower range must be evaluated against application requirements.

CLL5248B BK PBFREE (Central Semiconductor Corp)

This substitute is supplied in bulk packaging and maintains identical electrical specifications with extended operating temperature range (-65°C to 200°C). The manufacturer is different from the main part, and the package format remains DO-213AC/MINI-MELF/SOD-80, matching the original. All compliance certifications are maintained. Bulk packaging format requires integration into tape and reel systems for automated assembly processes.

CLL5248B TR PBFREE (Central Semiconductor Corp)

This substitute is supplied in Tape & Reel packaging, matching the original packaging format of DL5248B-TP. Electrical specifications are identical, and the package format is DO-213AC/MINI-MELF/SOD-80, maintaining compatibility with original board designs. Operating temperature range extends to 200°C. All compliance certifications are maintained. This option provides the most direct substitution path with minimal design modification requirements.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5248B-TP directly replace DL5248B-TP on existing circuit boards?

A: Electrical substitution is valid; however, package format differs. MMSZ5248B-TP uses SOD-123 packaging while DL5248B-TP uses Mini MELF. Board-level footprint compatibility must be verified before implementation. SOD-123 and Mini MELF have different physical dimensions and land patterns.

Q: What is the primary advantage of CLL5248B TR PBFREE over other substitutes?

A: CLL5248B TR PBFREE maintains the original Tape & Reel packaging format and Mini MELF package case, requiring no board redesign. It also provides extended operating temperature range to 200°C and is in active production status.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All identified substitute parts (MMSZ5248B-TP, CLL5248B BK PBFREE, and CLL5248B TR PBFREE) maintain ROHS3 compliance status, matching the original DL5248B-TP specification.

Q: Does the operating temperature range difference between DL5248B-TP and MMSZ5248B-TP affect substitution validity?

A: Operating temperature range is a secondary parameter. DL5248B-TP operates from -65°C to 175°C while MMSZ5248B-TP operates from -55°C to 150°C. Substitution is valid only if the application's thermal environment falls within the narrower MMSZ5248B-TP range.

Q: What packaging considerations apply when switching from Mini MELF to SOD-123?

A: SOD-123 and Mini MELF packages have different physical dimensions, footprint areas, and land pattern specifications. PCB layout modifications are required. Verify component placement density and thermal management characteristics before implementation.

Q: Are moisture sensitivity levels identical across all substitute parts?

A: Yes. All parts, including the main component and all substitutes, have Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity precautions are required during storage or handling.

Q: Can bulk-packaged CLL5248B BK PBFREE be used in automated assembly processes?

A: Bulk packaging requires conversion to tape and reel format for automated pick-and-place equipment. CLL5248B TR PBFREE is the preferred option for automated assembly as it is supplied in Tape & Reel format.

Q: What is the significance of the ±5% tolerance specification?

A: The ±5% tolerance applies to the nominal 18 V zener voltage. All substitute parts maintain this tolerance, ensuring consistent voltage regulation performance across the specified range (17.1 V to 18.9 V).

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