DZ2S05100L Zener Diode Equivalent & Substitute Parts

Part Overview

The DZ2S05100L is a 5.1 V, 150 mW surface mount zener diode manufactured by Panasonic Electronic Components in the SC-79/SOD-523 package. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active manufacturers. The part operates with ±5% voltage tolerance and is RoHS compliant with unlimited moisture sensitivity rating (MSL 1).

Substitute parts are required due to the discontinued status of the original component. Active alternatives maintain the core electrical specifications while offering improved availability and, in some cases, enhanced performance characteristics or automotive qualification.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nominal)	5.1	V
Tolerance	±5%	—
Power - Maximum	150	mW
Impedance (Maximum)	60	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 2 V
Voltage - Forward (Maximum) @ If	1	V @ 10 mA
Mounting Type	Surface Mount	—
Package / Case	SC-79, SOD-523	—
RoHS Status	RoHS Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the DZ2S05100L is determined by the following critical parameters:

Primary Matching Criteria:

Zener voltage nominal: 5.1 V (tolerance range 4.845 V to 5.355 V at ±5%)
Power dissipation: 150 mW minimum
Package type: SC-79 or SOD-523 surface mount
Mounting configuration: Surface mount

Secondary Compatibility Factors:

Impedance (Zzt): Maximum 60 Ohms to 80 Ohms acceptable
Reverse leakage current: 1 µA to 2 µA @ specified voltage
Forward voltage: 900 mV to 1 V @ 10 mA
RoHS compliance status

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (150 mW Power Rating):

EDZVT2R5.1B (Rohm Semiconductor): Exact 5.1 V nominal, 150 mW, improved ±2% tolerance, active status
EDZVFHT2R5.1B (Rohm Semiconductor): 5.09 V nominal, 150 mW, automotive qualified, active status

Category B - Enhanced Performance Alternatives (500 mW Power Rating):

MM5Z5V1T1G (onsemi): 5.1 V nominal, 500 mW, ±5.9% tolerance, active status
MM5Z5V1ST1G (onsemi): 5.1 V nominal, 500 mW, ±2% tolerance, active status
SZMM5Z5V1T1G (onsemi): 5.1 V nominal, 500 mW, ±5.9% tolerance, automotive qualified, active status

All substitute parts maintain SC-79/SOD-523 package compatibility and surface mount configuration.

Parameter Comparison

Part Number	Manufacturer	Vz (Nominal)	Tolerance	Power (Max)	Zzt (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Package	Status	Automotive
DZ2S05100L	Panasonic	5.1 V	±5%	150 mW	60 Ω	1 µA @ 2 V	1 V @ 10 mA	SC-79, SOD-523	Discontinued	—
EDZVT2R5.1B	Rohm	5.1 V	±2%	150 mW	80 Ω	2 µA @ 1.5 V	—	SC-79, SOD-523	Active	—
EDZVFHT2R5.1B	Rohm	5.09 V	±2.16%	150 mW	80 Ω	2 µA @ 1.5 V	—	SC-79, SOD-523	Active	AEC-Q101
MM5Z5V1T1G	onsemi	5.1 V	±5.9%	500 mW	60 Ω	2 µA @ 2 V	900 mV @ 10 mA	SC-79, SOD-523	Active	—
MM5Z5V1ST1G	onsemi	5.1 V	±2%	500 mW	60 Ω	2 µA @ 2 V	900 mV @ 10 mA	SC-79, SOD-523	Active	—
SZMM5Z5V1T1G	onsemi	5.1 V	±5.9%	500 mW	60 Ω	2 µA @ 2 V	900 mV @ 10 mA	SC-79, SOD-523	Active	AEC-Q101

Engineering Selection Recommendations

For Direct Replacement (150 mW Applications):

EDZVT2R5.1B is the primary direct substitute. This Rohm Semiconductor part maintains the 150 mW power rating and 5.1 V nominal zener voltage. The improved ±2% tolerance provides tighter voltage regulation compared to the original ±5% specification. The part is active with full availability and ROHS3 compliance. Operating temperature range of -55°C to 150°C supports standard industrial applications.

EDZVFHT2R5.1B offers an alternative with automotive qualification (AEC-Q101). The 5.09 V nominal voltage remains within the original ±5% tolerance band (4.845 V to 5.355 V). This part is suitable for applications requiring automotive-grade components.

For Enhanced Thermal Performance (500 mW Applications):

MM5Z5V1ST1G provides 500 mW power dissipation with ±2% tolerance and active status. This part accommodates applications with higher power requirements while maintaining the 5.1 V nominal specification. The extended operating temperature range (-65°C to 150°C) supports demanding environments.

SZMM5Z5V1T1G offers the same 500 mW capability with automotive qualification (AEC-Q101). This variant is appropriate for automotive or mission-critical applications requiring enhanced reliability.

MM5Z5V1T1G provides 500 mW capability with ±5.9% tolerance, matching the original tolerance band more closely than other onsemi alternatives.

All recommended substitutes maintain RoHS3 compliance, MSL 1 rating, and SC-79/SOD-523 package compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use a 500 mW zener diode as a substitute for the 150 mW DZ2S05100L?

A: Yes. A 500 mW part is electrically compatible and provides additional thermal margin. The higher power rating does not create incompatibility; it only increases the component's ability to dissipate heat. Circuit performance remains unchanged when zener voltage and tolerance specifications are met.

Q: What is the difference between EDZVT2R5.1B and EDZVFHT2R5.1B?

A: Both are Rohm 150 mW zener diodes with 5.1 V nominal voltage. EDZVFHT2R5.1B includes automotive qualification (AEC-Q101) and operates to 150°C maximum junction temperature. EDZVT2R5.1B operates across -55°C to 150°C. Select EDZVFHT2R5.1B for automotive applications; use EDZVT2R5.1B for standard industrial applications.

Q: Are the onsemi MM5Z5V1T1G and MM5Z5V1ST1G interchangeable?

A: Both parts are electrically compatible with identical 5.1 V nominal voltage, 500 mW power rating, and SC-79/SOD-523 package. The primary difference is tolerance: MM5Z5V1ST1G offers ±2% tolerance versus ±5.9% for MM5Z5V1T1G. Select MM5Z5V1ST1G for applications requiring tighter voltage regulation.

Q: Does the package designation SC-79 or SOD-523 affect substitution?

A: No. SC-79 and SOD-523 are equivalent designations for the same physical package. All listed substitutes use this package and are mechanically and electrically interchangeable in the same PCB footprint.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive industry standard qualification for discrete semiconductors. Parts bearing this qualification (EDZVFHT2R5.1B and SZMM5Z5V1T1G) meet enhanced reliability, temperature cycling, and stress testing requirements. Use these parts in automotive applications or when automotive-grade reliability is specified.

Q: Can I substitute based on tolerance alone?

A: No. Tolerance is one of several critical parameters. Zener voltage nominal, power rating, package type, and impedance must all match or exceed the original specification. Tolerance improvement (from ±5% to ±2%) is beneficial but does not substitute for other parameter mismatches.

Q: What is the significance of impedance (Zzt) differences between 60 Ω and 80 Ω?

A: Impedance affects voltage regulation under load changes. The original DZ2S05100L specifies 60 Ω maximum. Rohm substitutes specify 80 Ω maximum, which is acceptable as it represents a relaxed specification. Lower impedance provides better regulation; higher impedance is not a limitation for standard applications.

Q: Are all listed substitutes RoHS compliant?

A: Yes. All substitute parts carry ROHS3 compliance status. The original DZ2S05100L is RoHS compliant. All alternatives maintain or exceed this environmental standard.

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