CMHZ5259B TR PBFREE Zener Diode 39V 500mW SOD-123 Equivalent & Substitute Parts

Part Overview

The CMHZ5259B TR PBFREE is a surface mount Zener diode manufactured by Central Semiconductor Corp, rated at 39 V nominal Zener voltage with 500 mW maximum power dissipation in SOD-123 package. This component is classified as Active product status with full RoHS3 compliance and REACH unaffected designation. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility within the Zener diode category. Alternative sources become necessary for supply chain continuity, inventory availability, or design flexibility across multiple qualified manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	39	V
Tolerance	±5%	—
Power - Max	500	mW
Impedance (Max)	80	Ohms
Current - Reverse Leakage @ Vr	100 nA @ 30 V	—
Voltage - Forward (Max) @ If	900 mV @ 10 mA	—
Operating Temperature Range	-65 to 150	°C
Package / Case	SOD-123	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution logic for the CMHZ5259B TR PBFREE is based on the following critical parameters that must align for direct replacement:

Primary Matching Criteria:

Voltage - Zener (Nom): 39 V (exact match required)
Tolerance: ±5% (acceptable range for electrical equivalence)
Power - Max: 500 mW (primary power rating for thermal design)
Package / Case: SOD-123 (mechanical and thermal compatibility)
Mounting Type: Surface Mount (PCB assembly compatibility)
Operating Temperature Range: -65°C to 150°C minimum (functional envelope)

Secondary Compatibility Parameters:

Impedance (Max): 80 Ohms (reference specification; substitutes may vary within acceptable circuit performance margins)
Current - Reverse Leakage @ Vr: 100 nA @ 30 V (reference specification)
Voltage - Forward (Max) @ If: 900 mV @ 10 mA (reference specification)

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (500 mW, SOD-123): Parts matching 39 V nominal, 500 mW power rating, SOD-123 package, and -65°C to 150°C operating range. These provide full functional replacement with identical thermal and electrical performance envelope.

Category B - Reduced Power Equivalents (200-410 mW, SOD-123/SOD-323): Parts matching 39 V nominal and SOD-123 package but with reduced power ratings (200-410 mW) or alternative packages (SOD-323). These are suitable only when circuit design permits lower power dissipation or when package footprint alternatives are acceptable.

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Impedance (Max)	Zzt @ Vr	Vf (Max) @ If	Temp Range	Package	Packaging Type
CMHZ5259B TR PBFREE	Central Semiconductor	39 V	±5%	500 mW	80 Ω	100 nA @ 30 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Tape & Reel
BZT52B39-E3-08	Vishay General Semiconductor	39 V	±2%	410 mW	87 Ω	100 nA @ 29 V	—	-55 to 150°C	SOD-123	Tape & Reel
BZT52C39-13-F	Diodes Incorporated	39 V	±5%	500 mW	130 Ω	100 nA @ 27.3 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Tape & Reel
BZT52C39-7-F	Diodes Incorporated	39 V	±5%	500 mW	130 Ω	100 nA @ 27.3 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Cut Tape & Digi-Reel
BZT52C39-E3-08	Vishay General Semiconductor	39 V	±5%	410 mW	87 Ω	100 nA @ 29 V	—	-55 to 150°C	SOD-123	Tape & Reel
BZT52C39-TP	Micro Commercial Co	39 V	±5%	200 mW	130 Ω	100 nA @ 27.3 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Tape & Reel
BZT52C39S-7-F	Diodes Incorporated	39 V	±5%	200 mW	130 Ω	100 nA @ 27.3 V	900 mV @ 10 mA	-65 to 150°C	SOD-323	Tape & Reel
DDZ9716-7	Diodes Incorporated	39 V	±5%	500 mW	—	50 nA @ 29.6 V	900 mV @ 10 mA	-65 to 150°C	SOD-123	Tape & Reel
MMSZ39T1G	onsemi	39 V	±5%	500 mW	130 Ω	50 nA @ 27.3 V	900 mV @ 10 mA	-55 to 150°C	SOD-123	Cut Tape & Digi-Reel
MMSZ4716-E3-08	Vishay General Semiconductor	39 V	±5%	500 mW	—	10 nA @ 29.6 V	—	-55 to 150°C	SOD-123	Tape & Reel
MMSZ5259B-E3-08	Vishay General Semiconductor	39 V	±5%	500 mW	80 Ω	100 nA @ 30 V	—	-55 to 150°C	SOD-123	Tape & Reel

Engineering Selection Recommendations

Category A - Full Electrical Equivalents (Recommended for Direct Replacement):

The following parts provide complete functional equivalence to CMHZ5259B TR PBFREE with matching 39 V nominal voltage, 500 mW power rating, SOD-123 package, and operating temperature range of -65°C to 150°C:

BZT52C39-13-F (Diodes Incorporated): Matches all primary electrical parameters. RoHS3 compliant, MSL 1, REACH unaffected. Impedance specification (130 Ω) differs from main part (80 Ω) but remains within acceptable circuit performance margins for 39 V Zener applications.
BZT52C39-7-F (Diodes Incorporated): Identical electrical specifications to BZT52C39-13-F. Packaging format is Cut Tape & Digi-Reel rather than Tape & Reel; verify reel compatibility with assembly equipment before selection.
DDZ9716-7 (Diodes Incorporated): Matches 39 V, 500 mW, SOD-123, -65 to 150°C envelope. Reverse leakage specification (50 nA @ 29.6 V) is lower than main part reference (100 nA @ 30 V), indicating superior leakage performance. RoHS3 compliant, MSL 1, REACH unaffected.
MMSZ39T1G (onsemi): Matches 39 V, 500 mW, SOD-123 electrical specifications. Operating temperature range is -55 to 150°C (lower minimum than main part). Packaging format is Cut Tape & Digi-Reel. RoHS3 compliant, MSL 1, REACH unaffected.
MMSZ4716-E3-08 (Vishay General Semiconductor): Matches 39 V, 500 mW, SOD-123 specifications. Reverse leakage specification (10 nA @ 29.6 V) is significantly lower than main part reference, indicating superior leakage performance. Operating temperature range is -55 to 150°C. RoHS3 compliant, MSL 1, REACH unaffected.
MMSZ5259B-E3-08 (Vishay General Semiconductor): Matches main part specifications with identical impedance (80 Ω) and reverse leakage (100 nA @ 30 V). Operating temperature range is -55 to 150°C (lower minimum than main part). RoHS3 compliant, MSL 1, REACH unaffected.

Category B - Reduced Power Equivalents (Application-Dependent Selection):

The following parts match 39 V nominal voltage and SOD-123 package but with reduced power ratings or alternative packages. Selection requires circuit design verification that power dissipation requirements do not exceed specified ratings:

BZT52B39-E3-08 (Vishay General Semiconductor): 39 V nominal, 410 mW power rating (reduced from 500 mW). Tolerance ±2% (tighter than main part ±5%). Operating temperature range -55 to 150°C. Suitable only when circuit thermal design permits 410 mW maximum dissipation.
BZT52C39-TP (Micro Commercial Co): 39 V nominal, 200 mW power rating (significantly reduced). Operating temperature range -65 to 150°C matches main part. Suitable only for low-power applications where 200 mW dissipation is sufficient.
BZT52C39S-7-F (Diodes Incorporated): 39 V nominal, 200 mW power rating, but package is SOD-323 (SC-76) instead of SOD-123. Footprint and thermal characteristics differ; PCB layout and assembly compatibility must be verified before selection.

Compliance and Certification Status:

All listed substitute parts maintain RoHS3 compliance, MSL 1 (Unlimited) moisture sensitivity rating, and REACH unaffected status, matching the regulatory profile of the main part. All parts are classified as Active product status with current manufacturing support.

Frequently Asked Questions (FAQ)

Q1: Can BZT52C39-13-F be used as a direct replacement for CMHZ5259B TR PBFREE?

A: Yes. BZT52C39-13-F provides full electrical equivalence with matching 39 V nominal voltage, 500 mW power rating, SOD-123 package, and -65 to 150°C operating temperature range. The impedance specification differs (130 Ω vs. 80 Ω), but this variation remains within acceptable performance margins for 39 V Zener diode applications. Verify packaging format (Tape & Reel) compatibility with your assembly equipment.

Q2: What is the difference between BZT52C39-7-F and BZT52C39-13-F?

A: Both parts are manufactured by Diodes Incorporated with identical electrical specifications (39 V, 500 mW, SOD-123, ±5% tolerance, -65 to 150°C). The primary difference is packaging format: BZT52C39-13-F is supplied in Tape & Reel, while BZT52C39-7-F is supplied in Cut Tape & Digi-Reel format. Select based on your assembly line's reel handling capability.

Q3: Why does MMSZ5259B-E3-08 have a lower minimum operating temperature (-55°C vs. -65°C)?

A: MMSZ5259B-E3-08 is specified with a minimum operating temperature of -55°C, while CMHZ5259B TR PBFREE is specified at -65°C. If your application requires operation below -55°C, MMSZ5259B-E3-08 is not suitable. Select alternatives such as BZT52C39-13-F, BZT52C39-7-F, or DDZ9716-7, which maintain the -65°C minimum.

Q4: Can I use BZT52C39S-7-F (SOD-323 package) instead of the SOD-123 package main part?

A: BZT52C39S-7-F uses SOD-323 (SC-76) package instead of SOD-123. While electrical specifications match (39 V, 200 mW, ±5%), the package footprint and thermal characteristics are different. This substitution requires PCB layout redesign and assembly process verification. Use only if your design can accommodate SOD-323 package dimensions and thermal performance is acceptable for 200 mW dissipation.

Q5: What is the significance of reverse leakage current differences between substitute parts?

A: Reverse leakage current (Izr) specifications vary among substitutes. The main part specifies 100 nA @ 30 V. DDZ9716-7 and MMSZ39T1G specify 50 nA, while MMSZ4716-E3-08 specifies 10 nA. Lower leakage current indicates superior performance in high-impedance circuits or applications sensitive to standby current. Higher leakage (within specification) is acceptable for most standard applications. Select based on your circuit's leakage sensitivity requirements.

Q6: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating and REACH unaffected status, matching the regulatory profile of CMHZ5259B TR PBFREE. All parts are classified as Active product status.

Q7: Which substitute offers the best thermal performance for high-power applications?

A: For maximum thermal performance, select parts with 500 mW power rating: BZT52C39-13-F, BZT52C39-7-F, DDZ9716-7, MMSZ39T1G, MMSZ4716-E3-08, or MMSZ5259B-E3-08. All provide identical 500 mW dissipation capability. If operating temperature range below -55°C is required, select BZT52C39-13-F, BZT52C39-7-F, or DDZ9716-7 (all rated to -65°C).

Q8: What packaging format should I specify for high-volume production?

A: For high-volume surface mount assembly, Tape & Reel (TR) packaging is standard. Most substitutes are available in this format. Cut Tape & Digi-Reel format (BZT52C39-7-F, MMSZ39T1G) is suitable for lower-volume or mixed-component assembly. Verify your pick-and-place equipment compatibility before finalizing packaging selection.

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