DDZ27CSF-7 Equivalent & Substitute Parts

Part Overview

The DDZ27CSF-7 is an active Zener diode manufactured by Diodes Incorporated, rated at 26.29 V nominal with 500 mW power dissipation in a surface mount SOD-323F package. This component is designed for voltage regulation and protection applications requiring precise Zener voltage characteristics in compact form factors. Substitute parts are identified based on matching electrical parameters within acceptable tolerance ranges and compatible mechanical packaging specifications.

Substiute Parts

DDZ27CSF-7

Diodes IncorporatedIn Stock: 9326DDZ27CSF-7 Datasheet

Current PartRFQ

BZT52C27S-TP

Micro Commercial CoIn Stock: 3463BZT52C27S-TP Datasheet

MFR RecommendedRFQ

MMXZ5254B-TP

Micro Commercial CoIn Stock: 3804MMXZ5254B-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DDZ27CSF-7 is determined by the following critical parameters:

Primary Substitution Criteria:

• Zener voltage nominal rating within acceptable deviation from 26.29 V
• Power dissipation capacity of 500 mW or greater
• Surface mount package compatibility (SOD-323 or SOD-323F)
• Operating temperature range encompassing -65°C to 150°C
• RoHS3 compliance and MSL rating of 1

Secondary Compatibility Factors:

• Impedance characteristics (Zzt maximum)
• Reverse leakage current specifications
• Forward voltage characteristics
• Tolerance band (±3%, ±5%, ±7%)

The identified substitute parts BZT52C27S-TP and MMXZ5254B-TP share the same nominal Zener voltage of 27 V, which falls within the operational tolerance of the original specification. Both substitutes are surface mount devices in SOD-323 packaging with full RoHS3 compliance and MSL 1 rating. However, both substitute parts have reduced maximum power ratings of 200 mW compared to the 500 mW specification of the DDZ27CSF-7, which represents a significant design constraint for applications requiring higher power dissipation.

Parameter Comparison

Engineering Selection Recommendations

DDZ27CSF-7 (Primary Component)

The DDZ27CSF-7 remains the specified component for applications requiring 500 mW power dissipation with ±3% voltage tolerance. This part is active, in stock, and fully compliant with ROHS3 and REACH requirements. The tighter tolerance band and higher power rating provide superior performance in precision voltage regulation circuits.

BZT52C27S-TP (Substitute - Limited Application)

The BZT52C27S-TP is suitable for applications where power dissipation does not exceed 200 mW and the wider ±7% tolerance is acceptable. This part maintains full temperature range compatibility (-65°C to 150°C) and RoHS3 compliance. The higher impedance (80 Ohms maximum) may affect circuit performance in applications sensitive to dynamic impedance characteristics.

MMXZ5254B-TP (Substitute - Limited Application)

The MMXZ5254B-TP is suitable for applications where power dissipation does not exceed 200 mW and ±5% tolerance is acceptable. This part offers superior impedance characteristics (41 Ohms maximum) compared to BZT52C27S-TP. The minimum operating temperature is -55°C, which excludes this part from applications requiring operation below -55°C. Forward voltage characteristics differ significantly at higher current levels (1.2 V @ 100 mA versus 900 mV @ 10 mA).

Frequently Asked Questions (FAQ)

Q: Can BZT52C27S-TP or MMXZ5254B-TP replace DDZ27CSF-7 in all applications?

A: No. Both substitute parts have maximum power ratings of 200 mW, compared to 500 mW for the DDZ27CSF-7. Substitution is only valid for applications where power dissipation remains below 200 mW. Applications requiring the full 500 mW rating must use the DDZ27CSF-7.

Q: What is the voltage difference between DDZ27CSF-7 (26.29 V) and the substitutes (27 V)?

A: The DDZ27CSF-7 nominal voltage is 26.29 V with ±3% tolerance, yielding a range of 25.50 V to 27.08 V. The substitute parts are rated at 27 V nominal, which falls within the upper tolerance band of the original specification. However, BZT52C27S-TP has ±7% tolerance (25.11 V to 28.89 V) and MMXZ5254B-TP has ±5% tolerance (25.65 V to 28.35 V), both providing wider tolerance bands than the original ±3%.

Q: Are the SOD-323 and SOD-323F packages mechanically compatible?

A: Both SOD-323 and SOD-323F are surface mount packages with identical lead spacing and footprint dimensions. The packages are mechanically interchangeable on PCB layouts designed for SOD-323 components. However, the DDZ27CSF-7 is specified as SOD-323F, while substitutes are SOD-323. Verify with component datasheets for any application-specific package requirements.

Q: What is the impact of impedance differences on circuit performance?

A: The DDZ27CSF-7 has 70 Ohms maximum impedance. BZT52C27S-TP has 80 Ohms maximum impedance, while MMXZ5254B-TP has 41 Ohms maximum impedance. Lower impedance (MMXZ5254B-TP) provides better transient response and lower output impedance. Higher impedance (BZT52C27S-TP) may result in increased output impedance and slower transient response. Circuit performance depends on application-specific requirements for dynamic impedance characteristics.

Q: Can MMXZ5254B-TP be used in applications operating below -55°C?

A: No. MMXZ5254B-TP has a minimum operating temperature of -55°C, while DDZ27CSF-7 operates from -65°C. Applications requiring operation at temperatures below -55°C must use DDZ27CSF-7 or BZT52C27S-TP, which both support -65°C minimum temperature.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. DDZ27CSF-7, BZT52C27S-TP, and MMXZ5254B-TP are all ROHS3 compliant with MSL rating of 1 (Unlimited). All parts are suitable for applications with RoHS3 compliance requirements.