DL5257B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The DL5257B-TP is a 33 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 operates across a temperature range of -65°C to 175°C and maintains RoHS3 compliance with unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	33 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max)	58 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 25 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA
Operating Temperature	-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 DL5257B-TP is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage: 33 V nominal
Power dissipation: 500 mW maximum
Tolerance: ±5%
Impedance: 58 Ohms maximum
Reverse leakage current: 100 nA @ 25 V
Forward voltage: 1.1 V @ 200 mA
Operating temperature range: -65°C to 175°C minimum
Surface mount configuration
RoHS3 compliance

Package Compatibility: Substitute parts are grouped by package type. The original DL5257B-TP uses Mini MELF (SOD-80) packaging. Substitutes in identical or compatible packages are listed as direct replacements. Parts in alternative surface mount packages (SOD-123) are listed as similar alternatives with package-specific considerations.

Product Status Consideration: Active status substitutes are prioritized over obsolete components to ensure long-term availability and production continuity.

Parameter Comparison

Part Number	Manufacturer	Vz (V)	Tolerance	Power (mW)	Zzt (Ohms)	Reverse Leakage @ Vr	Vf (Max) @ If	Temp Range (°C)	Package	Status
DL5257B-TP	Micro Commercial Co	33	±5%	500	58	100 nA @ 25 V	1.1 V @ 200 mA	-65 ~ 175	Mini MELF	Obsolete
MMSZ5257B-TP	Micro Commercial Co	33	±5%	500	58	100 nA @ 25 V	900 mV @ 10 mA	-55 ~ 150	SOD-123	Active
CLL5257B TR PBFREE	Central Semiconductor Corp	33	±5%	500	58	100 nA @ 25 V	1.25 V @ 200 mA	-65 ~ 200	Mini MELF	Active
TLZ33B-GS18	Vishay General Semiconductor	33	—	500	65	40 nA @ 28.8 V	1.5 V @ 200 mA	-65 ~ 175	Mini MELF	Active
TLZ33C-GS08	Vishay General Semiconductor	33	—	500	65	40 nA @ 29.4 V	1.5 V @ 200 mA	-65 ~ 175	Mini MELF	Active
TLZ33C-GS18	Vishay General Semiconductor	33	—	500	65	40 nA @ 29.4 V	1.5 V @ 200 mA	-65 ~ 175	Mini MELF	Active
TLZ33D-GS08	Vishay General Semiconductor	33	—	500	65	40 nA @ 29.9 V	1.5 V @ 200 mA	-65 ~ 175	Mini MELF	Active
TZM5257B-GS08	Vishay General Semiconductor	33	±5%	500	58	100 nA @ 25 V	1.1 V @ 200 mA	-65 ~ 175	Mini MELF	Active
TZM5257B-GS18	Vishay General Semiconductor	33	±5%	500	58	100 nA @ 25 V	1.1 V @ 200 mA	-65 ~ 175	Mini MELF	Active

Engineering Selection Recommendations

Direct Parametric Equivalents (Highest Compatibility):

The TZM5257B-GS08 and TZM5257B-GS18 manufactured by Vishay General Semiconductor are parametric equivalents to the DL5257B-TP. These parts match all critical electrical specifications including 33 V zener voltage, ±5% tolerance, 500 mW power rating, 58 Ohms impedance, 100 nA reverse leakage, and 1.1 V forward voltage. Both maintain the identical -65°C to 175°C operating temperature range and Mini MELF package configuration. Both parts carry active product status and RoHS3 compliance.

Primary Substitute (Same Manufacturer, Enhanced Temperature Range):

The CLL5257B TR PBFREE from Central Semiconductor Corp provides functional equivalence with identical electrical specifications and Mini MELF packaging. This part extends the maximum operating temperature to 200°C, exceeding the original specification. Forward voltage is specified at 1.25 V @ 200 mA, representing a minor deviation within acceptable circuit design margins. Active product status ensures availability.

Alternative Package Option:

The MMSZ5257B-TP from Micro Commercial Co maintains electrical equivalence with 33 V zener voltage, ±5% tolerance, and 500 mW power rating. This part is packaged in SOD-123 surface mount configuration rather than Mini MELF. The operating temperature range is reduced to -55°C to 150°C. This substitute is suitable for applications where package footprint constraints permit SOD-123 implementation and temperature requirements do not exceed 150°C. Active product status provides long-term availability.

Similar Alternatives (Vishay TLZ Series):

The TLZ33B-GS18, TLZ33C-GS08, TLZ33C-GS18, and TLZ33D-GS08 from Vishay General Semiconductor maintain 33 V zener voltage and 500 mW power rating in Mini MELF packaging. These parts exhibit impedance of 65 Ohms and reduced reverse leakage current of 40 nA, representing improved performance characteristics. Forward voltage is specified at 1.5 V @ 200 mA. Operating temperature range matches the original at -65°C to 175°C. All parts carry active status and RoHS3 compliance. These alternatives are suitable where improved leakage characteristics provide circuit design benefits.

Frequently Asked Questions (FAQ)

Q: Can the MMSZ5257B-TP replace the DL5257B-TP in all applications?

A: The MMSZ5257B-TP provides electrical equivalence but uses SOD-123 packaging instead of Mini MELF. Substitution is valid only if the circuit board layout accommodates SOD-123 footprint and the operating temperature requirement does not exceed 150°C. The original DL5257B-TP supports -65°C to 175°C operation.

Q: What is the difference between the TZM5257B series and the TLZ33 series?

A: Both series maintain 33 V zener voltage and 500 mW power rating in Mini MELF packages. The TZM5257B-GS08 and TZM5257B-GS18 provide parametric equivalence with 58 Ohms impedance and 100 nA reverse leakage, matching the original DL5257B-TP specifications exactly. The TLZ33 variants exhibit 65 Ohms impedance and 40 nA reverse leakage, representing improved leakage performance. Forward voltage differs: TZM5257B at 1.1 V versus TLZ33 at 1.5 V @ 200 mA.

Q: Is the CLL5257B TR PBFREE suitable for high-temperature applications?

A: Yes. The CLL5257B TR PBFREE extends maximum operating temperature to 200°C, exceeding the original DL5257B-TP specification of 175°C. This part is suitable for applications requiring operation above 175°C while maintaining all other electrical specifications.

Q: What does the GS08 and GS18 designation indicate in Vishay part numbers?

A: The GS08 and GS18 designations indicate different tape and reel configurations for surface mount packaging. Both TZM5257B-GS08 and TZM5257B-GS18 are electrically identical; the designation reflects packaging and quantity per reel specifications for manufacturing and procurement purposes.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry RoHS3 compliance certification, matching the original DL5257B-TP compliance status. All parts maintain unlimited moisture sensitivity level (MSL 1).

Q: Can the TLZ33 series be used as a direct replacement for the DL5257B-TP?

A: The TLZ33 series provides functional equivalence with 33 V zener voltage and 500 mW power rating in compatible Mini MELF packaging. However, impedance is specified at 65 Ohms versus 58 Ohms for the original, and reverse leakage is 40 nA versus 100 nA. Forward voltage is 1.5 V versus 1.1 V @ 200 mA. These differences are within acceptable substitution parameters for most circuit applications but should be evaluated against specific circuit design requirements.

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