ZMM5250B-7 Equivalent & Substitute Parts

Part Overview

The ZMM5250B-7 is a Zener diode rated at 20 V nominal voltage with 500 mW power dissipation in a Mini MELF surface mount package. Manufactured by Diodes Incorporated, this component is classified as obsolete. Due to its obsolete status and limited inventory availability relative to active alternatives, equivalent substitute parts are necessary for ongoing design support and production continuity. Substitute parts maintain the core electrical specifications while offering improved availability through active product lines or alternative packaging formats.

Substiute Parts

ZMM5250B-7

Diodes IncorporatedIn Stock: 8154ZMM5250B-7 Datasheet

Current PartRFQ

MMSZ5250B-7-F

Diodes IncorporatedIn Stock: 113761MMSZ5250B-7-F Datasheet

MFR RecommendedRFQ

1N5250BUR-1

Microchip TechnologyIn Stock: 10741N5250BUR-1 Datasheet

MFR RecommendedRFQ

CDLL5250

Microchip TechnologyIn Stock: 1080CDLL5250 Datasheet

MFR RecommendedRFQ

CDLL5250A

Microchip TechnologyIn Stock: 999CDLL5250A Datasheet

MFR RecommendedRFQ

CDLL5250B

Microchip TechnologyIn Stock: 914CDLL5250B Datasheet

MFR RecommendedRFQ

TZMC20-M-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 1170TZMC20-M-08 Datasheet

MFR RecommendedRFQ

DL5250B-TP

Micro Commercial CoIn Stock: 779DL5250B-TP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZMM5250B-7 is determined by the following critical parameters:

Electrical Equivalence Criteria:

• Voltage - Zener (Nom): 20 V (exact match required)
• Tolerance: ±5% (acceptable tolerance band)
• Power - Max: 500 mW (exact match required)
• Impedance (Max): 25 Ohms (acceptable range)
• Current - Reverse Leakage @ Vr: 100 nA @ 15 V (acceptable range)
• Operating Temperature Range: -65°C to 175°C (acceptable range)

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount (required)
• Package / Case: DO-213AC, MINI-MELF, SOD-80 or equivalent surface mount packages

Substitute parts are grouped into two categories:

Category 1: Manufacturer Recommended Substitutes (Active Status) Parts that maintain identical electrical specifications with active product status and improved availability. These include MMSZ5250B-7-F (SOD-123 package), 1N5250BUR-1 (DO-213AA package), and CDLL5250B (DO-213AB package with ±5% tolerance).

Category 2: Parametric Equivalents (Obsolete Status) Parts that maintain identical electrical specifications but retain obsolete status. DL5250B-TP serves as a parametric equivalent with Mini MELF packaging identical to the main part.

Category 3: Tolerance Variants (Active Status) Parts with relaxed tolerance specifications (±10% or ±20%) that maintain all other electrical parameters. CDLL5250A (±10%) and CDLL5250 (±20%) are suitable where tolerance requirements permit.

Category 4: Automotive Grade Alternatives (Active Status) TZMC20-M-08 provides automotive qualification (AEC-Q101) with identical electrical specifications in SOD-80 MiniMELF packaging, suitable for applications requiring automotive-grade components.

Parameter Comparison

Engineering Selection Recommendations

For Direct Package Compatibility (Mini MELF / SOD-80): Select TZMC20-M-08 (Vishay) or DL5250B-TP (Micro Commercial Co) to maintain identical Mini MELF packaging. TZMC20-M-08 is preferred due to active product status and automotive-grade qualification (AEC-Q101), providing long-term availability and suitability for automotive applications. DL5250B-TP maintains obsolete status and should be used only when Mini MELF packaging is mandatory and TZMC20-M-08 is unavailable.

For Active Product Status with RoHS3 Compliance: Select MMSZ5250B-7-F (Diodes Incorporated) for SOD-123 packaging or TZMC20-M-08 (Vishay) for Mini MELF packaging. Both are active products with ROHS3 compliance. MMSZ5250B-7-F offers the highest inventory availability (113,690 pcs) and maintains Diodes Incorporated manufacturing continuity. Operating temperature range is -65°C to 150°C, which is acceptable for most applications within the -65°C to 175°C range.

For Extended Temperature Range (-65°C to 175°C): Select 1N5250BUR-1 (Microchip), CDLL5250B (Microchip), or TZMC20-M-08 (Vishay). All maintain the full -65°C to 175°C operating range. Note that 1N5250BUR-1 and CDLL5250B are RoHS non-compliant; verify compliance requirements before selection.

For Relaxed Tolerance Applications (±10% or ±20%): CDLL5250A (±10% tolerance) and CDLL5250 (±20% tolerance) are suitable where tighter tolerance is not required. Both are active products with -65°C to 175°C operating range and RoHS non-compliant status.

For Automotive Applications: TZMC20-M-08 is the only substitute with automotive qualification (AEC-Q101). Select this part for automotive-grade requirements.

Frequently Asked Questions (FAQ)

Q: Can MMSZ5250B-7-F replace ZMM5250B-7 directly? A: MMSZ5250B-7-F is electrically equivalent with identical voltage, tolerance, power rating, and impedance specifications. The primary difference is packaging: MMSZ5250B-7-F uses SOD-123 while ZMM5250B-7 uses Mini MELF. Direct replacement is possible if PCB layout accommodates SOD-123 footprint. Operating temperature range differs slightly (MMSZ5250B-7-F: -65°C to 150°C vs. ZMM5250B-7: -65°C to 175°C).

Q: What is the difference between DL5250B-TP and TZMC20-M-08? A: Both maintain identical Mini MELF packaging and electrical specifications. DL5250B-TP is obsolete (Micro Commercial Co), while TZMC20-M-08 is active (Vishay) with automotive qualification (AEC-Q101). TZMC20-M-08 is preferred for new designs due to active status and long-term availability. Impedance differs slightly: DL5250B-TP is 25 Ω while TZMC20-M-08 is 55 Ω.

Q: Are CDLL5250, CDLL5250A, and CDLL5250B interchangeable? A: These parts are electrically similar but differ in tolerance specifications: CDLL5250 (±20%), CDLL5250A (±10%), and CDLL5250B (±5%). All use DO-213AB packaging and maintain identical voltage, impedance, leakage current, and operating temperature range. Selection depends on tolerance requirements for the application. CDLL5250B matches the ±5% tolerance of ZMM5250B-7.

Q: Why does TZMC20-M-08 have higher impedance (55 Ω vs. 25 Ω)? A: Impedance is a specified parameter that varies by manufacturer design. The 55 Ω impedance of TZMC20-M-08 remains within acceptable operating parameters for 20 V Zener diodes and does not prevent functional substitution. Verify impedance requirements in circuit design specifications before selection.

Q: Is RoHS compliance important for substitute selection? A: RoHS compliance depends on application requirements and regulatory jurisdiction. ZMM5250B-7 is ROHS3 compliant. MMSZ5250B-7-F and TZMC20-M-08 are also ROHS3 compliant. 1N5250BUR-1, CDLL5250, CDLL5250A, and CDLL5250B are RoHS non-compliant. Verify compliance requirements before selecting non-compliant alternatives.

Q: Can I use a substitute with a different operating temperature range? A: Operating temperature range substitution is application-dependent. If the application operates within -65°C to 150°C, MMSZ5250B-7-F is acceptable. If the application requires the full -65°C to 175°C range, select 1N5250BUR-1, CDLL5250B, TZMC20-M-08, or DL5250B-TP. Verify actual operating conditions before selecting a part with a narrower temperature range.

Q: What packaging options are available for 20 V 500 mW Zener substitutes? A: Available packages include Mini MELF / SOD-80 (ZMM5250B-7, DL5250B-TP, TZMC20-M-08), SOD-123 (MMSZ5250B-7-F), and DO-213AB / MELF (CDLL5250, CDLL5250A, CDLL5250B). DO-213AA is also available (1N5250BUR-1). Package selection depends on PCB layout and design constraints.

Q: Which substitute has the highest inventory availability? A: MMSZ5250B-7-F has the highest inventory with 113,690 pcs in stock. This active product from Diodes Incorporated offers superior availability compared to other substitutes and the obsolete ZMM5250B-7 (8,109 pcs).