DL5221B-TP Zener Diode Equivalent & Substitute Parts

Part Overview

The DL5221B-TP is a 2.4 V, 500 mW surface mount zener diode manufactured by Micro Commercial Co in Mini MELF (DO-213AC/SOD-80) package. This part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs or production continuity.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	2.4 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max)	30 Ohms
Current - Reverse Leakage @ Vr	100 µA @ 1 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 DL5221B-TP is determined by the following critical parameters:

Electrical Parameters (Must Match):

Zener voltage: 2.4 V nominal
Tolerance: ±5%
Power dissipation: 500 mW maximum
Reverse leakage current: 100 µA @ 1 V
Forward voltage: 1.1 V @ 200 mA

Mechanical Parameters (Must Match):

Mounting type: Surface Mount
Package: DO-213AC / MINI-MELF / SOD-80

Compliance Parameters (Must Match):

RoHS3 Compliant
MSL 1 (Unlimited)

Substitute parts are grouped into two categories:

Category 1: Direct Electrical & Package Equivalents — Parts maintaining identical electrical specifications and Mini MELF packaging (TZM5221B-GS08, TZM5221B-GS18).

Category 2: Functional Equivalents with Package Variation — Parts meeting all electrical specifications but in alternative surface mount packages (MMSZ5221B-TP in SOD-123).

Category 3: Automotive-Grade Alternatives — Parts meeting electrical specifications with automotive qualification (TZMC2V4-M-08, TZMC2V4-M-18).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power Max	Impedance (Max)	Reverse Leakage @ Vr	Vf (Max) @ If	Operating Temp	Package	Status
DL5221B-TP	Micro Commercial Co	2.4 V	±5%	500 mW	30 Ohms	100 µA @ 1 V	1.1 V @ 200 mA	-65°C ~ 175°C	DO-213AC, MINI-MELF, SOD-80	Obsolete
TZM5221B-GS08	Vishay General Semiconductor	2.4 V	±5%	500 mW	30 Ohms	100 µA @ 1 V	1.1 V @ 200 mA	-65°C ~ 175°C	DO-213AC, MINI-MELF, SOD-80	Active
TZM5221B-GS18	Vishay General Semiconductor	2.4 V	±5%	500 mW	30 Ohms	100 µA @ 1 V	1.1 V @ 200 mA	-65°C ~ 175°C	DO-213AC, MINI-MELF, SOD-80	Active
MMSZ5221B-TP	Micro Commercial Co	2.4 V	±5%	500 mW	30 Ohms	100 µA @ 1 V	900 mV @ 10 mA	-55°C ~ 150°C	SOD-123	Active
TZMC2V4-M-08	Vishay General Semiconductor	2.4 V	±5%	500 mW	85 Ohms	50 µA @ 1 V	1.5 V @ 200 mA	-65°C ~ 175°C	DO-213AC, MINI-MELF, SOD-80	Active
TZMC2V4-M-18	Vishay General Semiconductor	2.4 V	±5%	500 mW	85 Ohms	50 µA @ 1 V	1.5 V @ 200 mA	-65°C ~ 175°C	DO-213AC, MINI-MELF, SOD-80	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

TZM5221B-GS08 and TZM5221B-GS18 are direct parametric equivalents to the DL5221B-TP. Both parts maintain identical electrical specifications (2.4 V, 500 mW, 30 Ohms impedance, 100 µA reverse leakage) and identical Mini MELF packaging. Both are active products from Vishay General Semiconductor with ROHS3 compliance and MSL 1 rating. Selection between GS08 and GS18 variants is determined by reel configuration requirements.

Secondary Substitute (Package Variation):

MMSZ5221B-TP from Micro Commercial Co provides electrical equivalence with identical impedance and reverse leakage specifications. This part is packaged in SOD-123 instead of Mini MELF. Forward voltage specification differs (900 mV @ 10 mA versus 1.1 V @ 200 mA), and operating temperature range is reduced (-55°C ~ 150°C versus -65°C ~ 175°C). This substitute is suitable for applications where SOD-123 package footprint is acceptable and the reduced temperature range does not conflict with system requirements.

Automotive-Grade Alternatives (TZMC2V4-M-08, TZMC2V4-M-18):

These Vishay parts maintain Mini MELF packaging and full temperature range (-65°C ~ 175°C) with AEC-Q101 automotive qualification. Electrical parameters differ: impedance is 85 Ohms (versus 30 Ohms), reverse leakage is 50 µA @ 1 V (versus 100 µA), and forward voltage is 1.5 V @ 200 mA (versus 1.1 V). These parts are suitable for applications requiring automotive-grade components where the specified electrical parameter variations are acceptable.

Frequently Asked Questions (FAQ)

Q: Can TZM5221B-GS08 and TZM5221B-GS18 be used interchangeably with DL5221B-TP?

A: Yes. Both parts are parametric equivalents with identical zener voltage (2.4 V), tolerance (±5%), power rating (500 mW), impedance (30 Ohms), reverse leakage (100 µA @ 1 V), forward voltage (1.1 V @ 200 mA), and operating temperature range (-65°C ~ 175°C). Both use identical Mini MELF packaging. The GS08 and GS18 designations refer to reel configuration only.

Q: What is the difference between MMSZ5221B-TP and the Mini MELF alternatives?

A: MMSZ5221B-TP is packaged in SOD-123, a smaller surface mount package than Mini MELF. Electrical specifications are equivalent for zener voltage, tolerance, power, and impedance. However, forward voltage is specified at different test conditions (900 mV @ 10 mA versus 1.1 V @ 200 mA), and the operating temperature range is narrower (-55°C ~ 150°C versus -65°C ~ 175°C). Package selection depends on PCB layout constraints and temperature requirements.

Q: Are TZMC2V4-M-08 and TZMC2V4-M-18 suitable replacements?

A: These parts maintain the Mini MELF package and full temperature range. However, electrical specifications differ: impedance is 85 Ohms (not 30 Ohms), reverse leakage is 50 µA @ 1 V (not 100 µA), and forward voltage is 1.5 V @ 200 mA (not 1.1 V). These parts are suitable only if circuit design accommodates these parameter variations. The automotive qualification (AEC-Q101) is beneficial for automotive applications.

Q: What does the GS08 and GS18 designation mean?

A: The GS08 and GS18 suffixes on Vishay TZM5221B parts indicate different reel configurations for tape and reel packaging. Both provide identical electrical and mechanical specifications. Selection is based on manufacturing equipment compatibility and reel quantity requirements.

Q: Can I use MMSZ5221B-TP in a design originally specified for Mini MELF packaging?

A: Package substitution from Mini MELF to SOD-123 requires PCB layout modification. SOD-123 is a smaller package with different footprint dimensions. Electrical performance is equivalent for the primary zener specifications, but forward voltage test conditions differ and operating temperature range is reduced. Verify that the reduced temperature range (-55°C ~ 150°C) meets system requirements before substitution.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (TZM5221B-GS08, TZM5221B-GS18, MMSZ5221B-TP, TZMC2V4-M-08, TZMC2V4-M-18) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the original DL5221B-TP specification.

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