ZMM5247B-7 Equivalent & Substitute Parts

Part Overview

The ZMM5247B-7 is a Zener diode rated at 17 V, 500 mW, manufactured by Diodes Incorporated in a Mini MELF surface mount package. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design and procurement requirements. The part is ROHS3 compliant and suitable for applications requiring voltage regulation and transient protection in the 17 V range.

Key Parameters

Parameter	Value
Voltage - Zener (Nom)	17 V
Tolerance	±5%
Power - Max	500 mW
Impedance (Max)	19 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 13 V
Voltage - Forward (Vf) (Max) @ If	1.5 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
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the ZMM5247B-7 is determined by the following critical parameters:

Electrical Parameters (Must Match):

Zener voltage: 17 V nominal
Power dissipation: 500 mW maximum
Impedance: 19 Ohms maximum
Reverse leakage current: 100 nA @ 13 V
Operating temperature range: -65°C to 175°C minimum

Mechanical Parameters (Must Match):

Mounting type: Surface Mount
Package compatibility: DO-213AC, MINI-MELF, or SOD-80

Tolerance Consideration: The ZMM5247B-7 specifies ±5% tolerance. Substitute parts with ±5% or tighter tolerance (±10%, ±20%) are functionally equivalent for applications where the original tolerance is acceptable. Parts with looser tolerance may be used where circuit design permits.

Compliance Parameters: ROHS3 compliance is preferred for new designs but not mandatory for substitution.

Substitute parts are grouped into two categories: Manufacturer Recommended (direct replacements with active product status) and Parametric Equivalents (parts meeting all electrical and mechanical specifications).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Vf (Max) @ If	Temp Range	Package	Product Status	RoHS Status
ZMM5247B-7	Diodes Incorporated	17 V	±5%	500 mW	19 Ω	1.5 V @ 200 mA	-65°C ~ 175°C	DO-213AC, MINI-MELF, SOD-80	Obsolete	ROHS3 Compliant
1N5247BUR-1	Microchip Technology	17 V	±5%	500 mW	19 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	DO-213AA	Active	RoHS non-compliant
CDLL5247	Microchip Technology	17 V	±20%	Not specified	19 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	DO-213AB, MELF	Active	RoHS non-compliant
CDLL5247A	Microchip Technology	17 V	±10%	Not specified	19 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	DO-213AB, MELF	Active	RoHS non-compliant
CDLL5247B	Microchip Technology	17 V	±5%	Not specified	19 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	DO-213AB, MELF	Active	RoHS non-compliant
CLL5247B TR PBFREE	Central Semiconductor Corp	17 V	±5%	500 mW	19 Ω	1.25 V @ 200 mA	-65°C ~ 200°C	DO-213AC, MINI-MELF, SOD-80	Active	ROHS3 Compliant
TZM5247B-GS08	Vishay General Semiconductor - Diodes Division	17 V	±5%	500 mW	19 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	DO-213AC, MINI-MELF, SOD-80	Active	ROHS3 Compliant
TZM5247B-GS18	Vishay General Semiconductor - Diodes Division	17 V	±5%	500 mW	19 Ω	1.1 V @ 200 mA	-65°C ~ 175°C	DO-213AC, MINI-MELF, SOD-80	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

The TZM5247B-GS08 and TZM5247B-GS18 from Vishay General Semiconductor are the preferred substitutes. Both parts maintain identical electrical specifications (17 V, ±5%, 500 mW, 19 Ω impedance) and package compatibility (DO-213AC, MINI-MELF, SOD-80). Both are active products with ROHS3 compliance, matching the original part's compliance status. The TZM5247B-GS08 offers higher inventory availability (30,100 units) compared to TZM5247B-GS18 (676 units).

The CLL5247B TR PBFREE from Central Semiconductor Corp is an alternative primary substitute. It matches all critical electrical parameters and package specifications, maintains ROHS3 compliance, and extends the operating temperature range to 200°C. This part has substantial inventory availability (14,597 units).

Secondary Substitutes (Package or Compliance Variations):

The CDLL5247B from Microchip Technology provides electrical equivalence (17 V, ±5%, 19 Ω impedance) but uses a different package (DO-213AB, MELF) and is not ROHS3 compliant. This part is suitable only where package change is acceptable and RoHS compliance is not required.

The 1N5247BUR-1 from Microchip Technology maintains electrical equivalence but uses DO-213AA packaging and is not ROHS3 compliant. Selection of this part requires verification of PCB layout compatibility with the DO-213AA package.

The CDLL5247A from Microchip Technology offers ±10% tolerance (tighter than the ±20% CDLL5247) but does not specify maximum power rating and uses DO-213AB packaging.

Not Recommended for Direct Substitution:

The CDLL5247 from Microchip Technology specifies ±20% tolerance, which exceeds the original part's ±5% specification and may not meet circuit requirements for voltage regulation accuracy.

Frequently Asked Questions (FAQ)

Q: Can I use TZM5247B-GS08 or TZM5247B-GS18 as direct replacements for ZMM5247B-7?

A: Yes. Both Vishay parts maintain identical zener voltage (17 V), tolerance (±5%), power rating (500 mW), impedance (19 Ω), and operating temperature range (-65°C to 175°C). Both use compatible surface mount packages (DO-213AC, MINI-MELF, SOD-80) and are ROHS3 compliant. No circuit modifications are required.

Q: What is the difference between the Microchip CDLL5247, CDLL5247A, and CDLL5247B parts?

A: These parts differ in tolerance specification. CDLL5247 specifies ±20% tolerance, CDLL5247A specifies ±10% tolerance, and CDLL5247B specifies ±5% tolerance. All three use DO-213AB packaging. For applications requiring ±5% accuracy, only CDLL5247B is equivalent to the original ZMM5247B-7.

Q: Why is the 1N5247BUR-1 listed as a substitute if it uses a different package?

A: The 1N5247BUR-1 meets all electrical specifications (17 V, ±5%, 500 mW, 19 Ω impedance) and operating temperature range. However, it uses DO-213AA packaging instead of the original DO-213AC/MINI-MELF/SOD-80. This part is suitable only if PCB layout can accommodate the DO-213AA package footprint.

Q: Does the CLL5247B TR PBFREE offer any advantages over the Vishay TZM5247B parts?

A: The CLL5247B TR PBFREE extends the maximum operating temperature to 200°C compared to 175°C for the Vishay parts. All other electrical parameters are identical. Selection depends on application temperature requirements. The CLL5247B also offers higher inventory availability.

Q: Are all substitute parts ROHS3 compliant?

A: No. Only the TZM5247B-GS08, TZM5247B-GS18, and CLL5247B TR PBFREE are ROHS3 compliant. The Microchip parts (1N5247BUR-1, CDLL5247, CDLL5247A, CDLL5247B) are RoHS non-compliant. For applications requiring ROHS3 compliance, use only the Vishay or Central Semiconductor parts.

Q: Can I substitute a part with ±10% or ±20% tolerance for the original ±5% part?

A: Substitution with looser tolerance is possible only if circuit design permits the wider voltage variation. The CDLL5247A (±10%) and CDLL5247 (±20%) may be used where the application can tolerate greater zener voltage deviation. Verify circuit performance requirements before selecting these parts.

Q: What is the significance of the different Vishay part numbers (TZM5247B-GS08 vs. TZM5247B-GS18)?

A: Both parts are electrically and mechanically identical. The suffix designates different packaging configurations or tape specifications. Both are suitable for the ZMM5247B-7 application. Selection may be based on inventory availability or existing supply chain preferences.

Q: Is forward voltage (Vf) a critical parameter for substitution?

A: Forward voltage differences (ranging from 1.1 V to 1.5 V @ 200 mA across the substitute parts) are not critical for zener diode applications where the device operates in reverse bias. These specifications are provided for reference but do not affect substitution suitability for voltage regulation and transient protection circuits.

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