DL5243B-TP Equivalent & Substitute Parts

Part Overview

The DL5243B-TP is a Zener diode rated at 13 V, 500 mW with ±5% tolerance, manufactured by Micro Commercial Co in a Mini MELF surface mount package. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and production continuity. Substitute parts maintain the core electrical specifications while offering alternative package configurations and enhanced availability through active product lines.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	13 V
Power - Max	500 mW
Tolerance	±5%
Impedance (Max)	13 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 9.9 V
Mounting Type	Surface Mount
Operating Temperature Range	-65°C ~ 175°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the DL5243B-TP is determined by the following critical parameters:

Primary Electrical Specifications:

Zener voltage: 13 V nominal
Power dissipation: 500 mW maximum
Mounting type: Surface mount

Secondary Compatibility Factors:

Tolerance specification (±5% or tighter)
Impedance characteristics
Reverse leakage current
Operating temperature range
Package compatibility (Mini MELF/SOD-80 form factors)

Substitute parts are grouped into two categories:

Category 1: Direct Electrical Equivalents (Same Tolerance) Parts maintaining ±5% tolerance with identical electrical performance: MMSZ5243B-TP, CLL5243B BK PBFREE, CLL5243B TR PBFREE, TLZ13-GS08, and TLZ13-GS18.

Category 2: Enhanced Performance Alternatives (Tighter Tolerance) Parts with ±2% tolerance offering improved voltage regulation accuracy: TZMB13-GS08 and TZMB13-GS18. These include automotive-grade qualification (AEC-Q101) and reduced reverse leakage current.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Impedance (Max)	Leakage @ Vr	Temp Range	Package	Status
DL5243B-TP	Micro Commercial Co	13 V	±5%	500 mW	13 Ω	500 nA @ 9.9 V	-65°C ~ 175°C	Mini MELF	Obsolete
MMSZ5243B-TP	Micro Commercial Co	13 V	±5%	500 mW	13 Ω	500 nA @ 9.9 V	-55°C ~ 150°C	SOD-123	Active
CLL5243B BK PBFREE	Central Semiconductor Corp	13 V	±5%	500 mW	13 Ω	500 nA @ 9.9 V	-65°C ~ 200°C	SOD-80	Active
CLL5243B TR PBFREE	Central Semiconductor Corp	13 V	±5%	500 mW	13 Ω	500 nA @ 9.9 V	-65°C ~ 200°C	SOD-80	Active
TLZ13-GS08	Vishay General Semiconductor	13 V	Not specified	500 mW	14 Ω	Not specified	-65°C ~ 175°C	SOD-80	Active
TLZ13-GS18	Vishay General Semiconductor	13 V	Not specified	500 mW	14 Ω	Not specified	-65°C ~ 175°C	SOD-80	Active
TZMB13-GS08	Vishay General Semiconductor	13 V	±2%	500 mW	26 Ω	100 nA @ 10 V	-65°C ~ 175°C	SOD-80	Active
TZMB13-GS18	Vishay General Semiconductor	13 V	±2%	500 mW	26 Ω	100 nA @ 10 V	-65°C ~ 175°C	SOD-80	Active

Engineering Selection Recommendations

For Direct Replacement with Identical Specifications:

MMSZ5243B-TP (Micro Commercial Co) provides electrical equivalence with the original DL5243B-TP. This part maintains ±5% tolerance, 13 Ω impedance, and 500 nA reverse leakage. The primary difference is package format (SOD-123 versus Mini MELF) and reduced operating temperature range (-55°C to 150°C versus -65°C to 175°C). Selection of MMSZ5243B-TP is appropriate for applications where the narrower temperature range is acceptable and SOD-123 package compatibility exists.

For Extended Temperature Performance:

CLL5243B BK PBFREE or CLL5243B TR PBFREE (Central Semiconductor Corp) extend the operating temperature range to -65°C to 200°C while maintaining electrical equivalence. Both variants preserve ±5% tolerance and 13 Ω impedance. The BK variant is supplied in bulk packaging; the TR variant is supplied in tape and reel. Selection depends on production volume and assembly process requirements.

For Automotive and Enhanced Regulation Applications:

TZMB13-GS08 and TZMB13-GS18 (Vishay General Semiconductor) offer tighter ±2% tolerance and AEC-Q101 automotive qualification. These parts feature reduced reverse leakage (100 nA @ 10 V) and higher impedance (26 Ω). Selection is appropriate for automotive applications, high-reliability systems, or designs requiring improved voltage regulation accuracy. TZMB13-GS08 is supplied in tape and reel; TZMB13-GS18 is supplied in cut tape.

For General-Purpose Substitution:

TLZ13-GS08 and TLZ13-GS18 (Vishay General Semiconductor) provide active-status alternatives with 13 V nominal rating and 500 mW power rating. Impedance is specified at 14 Ω. These parts are suitable for applications where tolerance specification is not critical and automotive qualification is not required.

All substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and EAR99 export classification consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5243B-TP directly replace DL5243B-TP in all applications?

A: MMSZ5243B-TP provides electrical equivalence with identical voltage, power, tolerance, and impedance specifications. However, the operating temperature range is reduced from -65°C to 175°C to -55°C to 150°C. Applications operating below -55°C or above 150°C require alternative selections. Additionally, the SOD-123 package differs from the Mini MELF package; PCB layout and assembly compatibility must be verified.

Q: What is the difference between CLL5243B BK PBFREE and CLL5243B TR PBFREE?

A: Both parts are electrically identical with 13 V nominal voltage, ±5% tolerance, and 500 mW power rating. The difference is packaging format: BK denotes bulk packaging for high-volume applications, while TR denotes tape and reel packaging for automated assembly. Selection depends on production volume, inventory management, and assembly equipment compatibility.

Q: When should TZMB13-GS08 or TZMB13-GS18 be selected over other substitutes?

A: TZMB13-GS08 and TZMB13-GS18 are selected when tighter voltage tolerance (±2% versus ±5%) is required for improved regulation accuracy, or when automotive-grade qualification (AEC-Q101) is mandated by design or customer requirements. These parts also feature lower reverse leakage current (100 nA versus 500 nA), beneficial for low-power or precision applications. The higher impedance (26 Ω versus 13 Ω) must be evaluated for circuit performance.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts listed maintain ROHS3 compliance and are REACH unaffected, consistent with the original DL5243B-TP specification.

Q: What is the significance of impedance differences between substitute parts?

A: Impedance (Zzt) affects the dynamic resistance of the Zener diode under transient conditions. The original DL5243B-TP and most direct equivalents specify 13 Ω impedance. TZMB13 series parts specify 26 Ω impedance. Higher impedance results in greater voltage variation under load changes. Circuit designs relying on specific impedance characteristics must account for this parameter when selecting substitutes.

Q: Can TLZ13-GS08 and TLZ13-GS18 be used interchangeably?

A: TLZ13-GS08 and TLZ13-GS18 are electrically identical with the same voltage, power, impedance, and temperature specifications. The difference is packaging format: GS08 denotes tape and reel packaging, while GS18 denotes cut tape packaging. Selection depends on assembly process and equipment compatibility.

Q: What is the impact of reduced operating temperature range in MMSZ5243B-TP?

A: MMSZ5243B-TP operates from -55°C to 150°C, compared to the original part's -65°C to 175°C range. Applications requiring operation below -55°C or above 150°C must select alternative parts such as CLL5243B variants or TZMB13 series, which maintain the full -65°C to 175°C range.

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