CMPZ5249B TR PBFREE Equivalent & Substitute Parts

Part Overview

The CMPZ5249B TR PBFREE is a 19 V Zener diode manufactured by Central Semiconductor Corp, rated for 350 mW maximum power dissipation in a surface mount SOT-23 package. This component is classified as Active and RoHS3 compliant. Substitute parts are identified to address inventory availability, extended lead times, or specific application requirements while maintaining electrical and mechanical compatibility within the defined parameter tolerances for 19 V Zener diode applications.

Substiute Parts

CMPZ5249B TR PBFREE

Central Semiconductor CorpIn Stock: 1048CMPZ5249B TR PBFREE Datasheet

Current PartRFQ

MMBZ5249BLT1G

onsemiIn Stock: 21115MMBZ5249BLT1G Datasheet

MFR RecommendedRFQ

SZMMBZ5249BLT1G

onsemiIn Stock: 38508SZMMBZ5249BLT1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CMPZ5249B TR PBFREE is determined by strict equivalence in the following critical parameters:

Electrical Equivalence Criteria:

• Voltage - Zener (Nominal): 19 V
• Tolerance: ±5%
• Impedance (Maximum): 23 Ohms
• Current - Reverse Leakage @ Vr: 100 nA @ 14 V
• Voltage - Forward (Maximum) @ If: 900 mV @ 10 mA
• Operating Temperature Range: -65°C to 150°C

Mechanical Equivalence Criteria:

• Mounting Type: Surface Mount
• Package / Case: TO-236-3, SC-59, SOT-23-3
• Moisture Sensitivity Level: 1 (Unlimited)

Compliance Criteria:

• RoHS Status: ROHS3 Compliant
• REACH Status: REACH Unaffected

The identified substitute parts maintain all critical electrical parameters and package specifications. Differences in maximum power rating (350 mW vs. 225 mW) represent a derating condition and do not prevent substitution in applications where the lower power rating is acceptable.

Parameter Comparison

Engineering Selection Recommendations

MMBZ5249BLT1G (onsemi): This part is the manufacturer-recommended substitute for the CMPZ5249B TR PBFREE. It maintains all critical electrical parameters and package specifications. The maximum power rating is 225 mW compared to 350 mW for the original part. This part is suitable for applications where the lower power dissipation rating does not exceed circuit requirements. ROHS3 compliance and MSL 1 rating confirm environmental and handling compatibility.

SZMMBZ5249BLT1G (onsemi): This part is functionally equivalent to MMBZ5249BLT1G with the addition of Automotive grade qualification and AEC-Q101 certification. All electrical parameters and package specifications remain identical. This part is specified for automotive applications requiring AEC-Q101 qualification. The maximum power rating is 225 mW. ROHS3 compliance and MSL 1 rating are maintained.

Selection Basis:

• Both substitute parts are Active status components from onsemi
• Both maintain the 19 V nominal Zener voltage with ±5% tolerance
• Both preserve the SOT-23-3 package and surface mount configuration
• Both comply with ROHS3 and REACH requirements
• SZMMBZ5249BLT1G is selected for automotive applications; MMBZ5249BLT1G for general industrial applications
• Power rating derating from 350 mW to 225 mW must be evaluated against circuit thermal requirements

Frequently Asked Questions (FAQ)

Q: Can MMBZ5249BLT1G replace CMPZ5249B TR PBFREE in all applications?

A: MMBZ5249BLT1G is electrically and mechanically equivalent for all parameters except maximum power dissipation. The substitute part is rated for 225 mW versus 350 mW for the original. Substitution is valid when circuit power dissipation does not exceed 225 mW. Thermal analysis of the application is required to confirm compatibility.

Q: What is the difference between MMBZ5249BLT1G and SZMMBZ5249BLT1G?

A: Both parts are identical in electrical specifications and package configuration. SZMMBZ5249BLT1G carries Automotive grade designation and AEC-Q101 qualification, making it suitable for automotive applications. MMBZ5249BLT1G is specified for general industrial use. Selection depends on application requirements.

Q: Are the substitute parts pin-compatible with the original CMPZ5249B TR PBFREE?

A: Yes. All three parts use the TO-236-3 / SOT-23-3 package with identical pinout. Physical and electrical pin compatibility is confirmed.

Q: Do the substitute parts meet the same compliance standards?

A: Yes. Both MMBZ5249BLT1G and SZMMBZ5249BLT1G are ROHS3 compliant and REACH unaffected, matching the original part's compliance status. SZMMBZ5249BLT1G adds AEC-Q101 automotive qualification.

Q: What is the impact of the lower power rating on circuit design?

A: The substitute parts are rated for 225 mW maximum power dissipation compared to 350 mW for the original. In applications where the Zener diode dissipates more than 225 mW, thermal management or circuit redesign may be necessary. Power dissipation is calculated as P = Vz × Iz, where Iz is the Zener current. Circuit analysis must confirm that operating conditions remain within the 225 mW limit.

Q: Are there inventory or lead time advantages to using the substitute parts?

A: MMBZ5249BLT1G has 21,084 pcs in stock and SZMMBZ5249BLT1G has 38,400 pcs in stock, compared to 980 pcs for the original CMPZ5249B TR PBFREE. Substitute parts offer significantly higher inventory availability.