ZMM5243B-7 Equivalent & Substitute Parts

Part Overview

The ZMM5243B-7 is a Zener diode rated at 13 V nominal 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 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, updated packaging options, and active product status from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	13	V
Tolerance	±5%	-
Power - Max	500	mW
Impedance (Max)	13	Ohms
Current - Reverse Leakage @ Vr	500	nA @ 9.9 V
Voltage - Forward (Max) @ If	1.5	V @ 200 mA
Operating Temperature Range	-65 to 175	°C
Mounting Type	Surface Mount	-
Package / Case	DO-213AC, MINI-MELF, SOD-80	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the ZMM5243B-7 is determined by the following critical parameters:

Electrical Equivalence Criteria:

Voltage - Zener (Nom): 13 V
Power - Max: 500 mW
Impedance (Max): 13 Ohms (or 14 Ohms for Vishay parts, within acceptable range)
Current - Reverse Leakage @ Vr: 500 nA @ 9.9 V (or lower)
Operating Temperature Range: -65°C to 175°C minimum

Mechanical Compatibility Criteria:

Mounting Type: Surface Mount
Package / Case: DO-213AC (Mini MELF), SOD-123, or DO-213AB (MELF)

Compliance Criteria:

RoHS3 Compliant preferred for new designs
REACH Unaffected status preferred

Substitute parts are grouped by package type: Mini MELF variants (TLZ series from Vishay), SOD-123 variant (MMSZ5243B-7-F from Diodes Incorporated), and DO-213AB MELF variants (CDLL series from Microchip Technology). All substitutes maintain the 13 V nominal zener voltage and 500 mW power rating. Tolerance variations exist among substitutes (±5%, ±10%, ±20%) and are noted for circuit-specific selection.

Parameter Comparison

Parameter	ZMM5243B-7	MMSZ5243B-7-F	1N5243BUR-1	CDLL5243B	TLZ13A-GS08	TLZ13B-GS08
Manufacturer	Diodes Inc.	Diodes Inc.	Microchip	Microchip	Vishay	Vishay
Voltage - Zener (Nom)	13 V	13 V	13 V	13 V	13 V	13 V
Tolerance	±5%	±5%	±5%	±5%	-	-
Power - Max	500 mW	500 mW	500 mW	-	500 mW	500 mW
Impedance (Max)	13 Ohms	13 Ohms	13 Ohms	13 Ohms	14 Ohms	14 Ohms
Current - Reverse Leakage @ Vr	500 nA @ 9.9 V	500 nA @ 9.9 V	500 nA @ 9.9 V	500 nA @ 9.9 V	40 nA @ 11.5 V	40 nA @ 11.9 V
Voltage - Forward (Max) @ If	1.5 V @ 200 mA	900 mV @ 10 mA	1.1 V @ 200 mA	1.1 V @ 200 mA	1.5 V @ 200 mA	1.5 V @ 200 mA
Operating Temperature	-65 to 175°C	-65 to 150°C	-65 to 175°C	-65 to 175°C	-65 to 175°C	-65 to 175°C
Package / Case	DO-213AC, Mini MELF	SOD-123	DO-213AA	DO-213AB, MELF	DO-213AC, Mini MELF	DO-213AC, Mini MELF
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Non-compliant	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Package Replacement (Mini MELF / SOD-80):

Select TLZ13A-GS08 or TLZ13B-GS08 from Vishay General Semiconductor - Diodes Division. These parts maintain identical package geometry (DO-213AC, Mini MELF, SOD-80) to the ZMM5243B-7, enabling direct PCB substitution without layout modification. Both variants are ROHS3 Compliant and carry Active product status. TLZ13A-GS08 offers the highest inventory availability (112,700 pcs) among Mini MELF options. Reverse leakage current is lower (40 nA @ 11.5 V) compared to the original specification (500 nA @ 9.9 V), representing improved performance characteristics.

For Active Product Status with RoHS3 Compliance:

MMSZ5243B-7-F from Diodes Incorporated provides an alternative in SOD-123 package with Active product status and ROHS3 Compliance. This option requires PCB layout modification due to different package footprint. Operating temperature range is limited to -65°C to 150°C (versus 175°C maximum for the original). Inventory availability is substantial (26,300 pcs).

For DO-213AB MELF Package:

CDLL5243B from Microchip Technology offers ±5% tolerance matching in DO-213AB MELF package with Active product status. This part is RoHS non-compliant and carries REACH Unaffected status. Inventory is available (900 pcs). This option is suitable for applications where RoHS compliance is not required and package footprint compatibility with DO-213AB is acceptable.

For Extended Temperature Range:

1N5243BUR-1 from Microchip Technology maintains the full -65°C to 175°C operating range in DO-213AA package. This part is RoHS non-compliant. Inventory is limited (826 pcs). Selection is appropriate for applications requiring maximum temperature performance where RoHS compliance is not mandated.

Frequently Asked Questions (FAQ)

Q: Can I use MMSZ5243B-7-F as a direct replacement for ZMM5243B-7 without PCB modification?

A: No. MMSZ5243B-7-F uses SOD-123 package while ZMM5243B-7 uses Mini MELF (DO-213AC). The footprints are different and require PCB layout changes. For direct replacement without layout modification, use TLZ13A-GS08 or TLZ13B-GS08, which maintain the Mini MELF package.

Q: What is the difference between TLZ13A-GS08 and TLZ13B-GS08?

A: Both parts are electrically equivalent with identical electrical specifications. The primary difference is reverse leakage current measurement point: TLZ13A-GS08 is measured at 11.5 V while TLZ13B-GS08 is measured at 11.9 V. Both deliver 40 nA maximum leakage. Selection between these variants depends on circuit-specific leakage requirements at the measurement voltage.

**Q: Why do some substitute parts show "-" for tolerance while the original specifies ±5%?

A: Vishay TLZ series parts (TLZ13-GS18, TLZ13A-GS08, TLZ13A-GS18, TLZ13B-GS08, TLZ13B-GS18) do not specify tolerance in the provided data. These parts maintain 13 V nominal zener voltage and are electrically compatible. Tolerance information should be obtained from the manufacturer datasheet if circuit design requires explicit tolerance specification.

Q: Is the ZMM5243B-7 still available for purchase?

A: ZMM5243B-7 is classified as Obsolete with 10,100 pcs in stock. While current inventory exists, long-term availability is not assured. Active substitute parts (MMSZ5243B-7-F, TLZ13A-GS08, TLZ13B-GS08, CDLL5243B) offer superior availability and ongoing manufacturer support.

Q: What is the impact of the operating temperature difference between ZMM5243B-7 (-65 to 175°C) and MMSZ5243B-7-F (-65 to 150°C)?

A: MMSZ5243B-7-F has a 25°C lower maximum operating temperature. For applications operating at temperatures above 150°C, this substitute is not suitable. For applications with maximum operating temperature at or below 150°C, MMSZ5243B-7-F is acceptable.

Q: Are all substitute parts RoHS3 Compliant?

A: No. TLZ13A-GS08, TLZ13B-GS08, and MMSZ5243B-7-F are ROHS3 Compliant. CDLL5243B, CDLL5243A, CDLL5243, and 1N5243BUR-1 are RoHS non-compliant. For designs requiring RoHS3 compliance, select from the compliant group.

Q: Can I substitute CDLL5243 (±20% tolerance) for ZMM5243B-7 (±5% tolerance)?

A: CDLL5243 maintains the 13 V nominal zener voltage and 500 mW power rating but with ±20% tolerance instead of ±5%. This wider tolerance may not be acceptable for circuits requiring tight voltage regulation. CDLL5243B (±5% tolerance) or CDLL5243A (±10% tolerance) are more appropriate alternatives if DO-213AB package is required.

Q: What is the significance of the impedance specification (13 Ohms vs. 14 Ohms)?

A: Impedance affects dynamic resistance and voltage regulation performance. ZMM5243B-7 specifies 13 Ohms maximum impedance. Vishay TLZ series parts specify 14 Ohms maximum impedance. This 1 Ohm difference is within acceptable range for most applications but should be verified against circuit design requirements for precision voltage reference applications.

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