DDZ2V4ASF-7 Equivalent & Substitute Parts

Part Overview

The DDZ2V4ASF-7 is a Zener diode manufactured by Diodes Incorporated, rated at 2.43 V nominal with 500 mW maximum 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.

The DDZ2V4ASF-7 is currently discontinued at DiGi Electronics. Equivalent and substitute parts are available from active product lines that maintain functional compatibility within specified electrical and mechanical parameters. Substitute parts must satisfy the core electrical requirements: Zener voltage tolerance, maximum power rating, impedance characteristics, and surface mount packaging compatibility.

Substiute Parts

DDZ2V4ASF-7

Diodes IncorporatedIn Stock: 2565DDZ2V4ASF-7 Datasheet

Current PartRFQ

BZT52C2V4S-TP

Micro Commercial CoIn Stock: 3863BZT52C2V4S-TP Datasheet

MFR RecommendedRFQ

MMXZ5221B-TP

Micro Commercial CoIn Stock: 717MMXZ5221B-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the DDZ2V4ASF-7 is based on the following criteria:

Electrical Compatibility Requirements:

• Zener voltage nominal value within 2.4 V range (accounting for ±4% to ±6% tolerance bands)
• Maximum power dissipation of 200 mW or greater (substitutes may have lower ratings if application permits)
• Impedance maximum of 100 Ohms or lower
• Forward voltage characteristics compatible with 900 mV @ 10 mA reference

Mechanical Compatibility Requirements:

• Surface mount package format (SOD-323 or SOD-323F)
• Moisture sensitivity level MSL 1 (Unlimited)
• Operating temperature range encompassing -65°C to 150°C

Regulatory Compliance Requirements:

• ROHS3 compliant
• REACH unaffected status
• EAR99 classification

The substitute parts identified (BZT52C2V4S-TP and MMXZ5221B-TP) satisfy these criteria with the following trade-offs:

• BZT52C2V4S-TP: Maintains 2.4 V nominal voltage with ±6% tolerance, reduces power rating to 200 mW, maintains 100 Ohms impedance maximum
• MMXZ5221B-TP: Maintains 2.4 V nominal voltage with ±5% tolerance, reduces power rating to 200 mW, improves impedance to 30 Ohms maximum

Parameter Comparison

Engineering Selection Recommendations

BZT52C2V4S-TP Selection Criteria:

This substitute is appropriate for applications where the 200 mW power rating is sufficient and voltage tolerance of ±6% is acceptable. The part maintains electrical parameter parity with the original DDZ2V4ASF-7 in impedance (100 Ohms maximum) and forward voltage characteristics. Product status is active with substantial inventory availability (3765 pieces). Full ROHS3 compliance and REACH unaffected status ensure regulatory alignment. Operating temperature range (-65°C to 150°C) matches the original specification.

MMXZ5221B-TP Selection Criteria:

This substitute offers superior impedance performance (30 Ohms maximum versus 100 Ohms), resulting in improved voltage regulation characteristics. Voltage tolerance of ±5% provides tighter control than BZT52C2V4S-TP. The 200 mW power rating applies the same constraint as the alternative substitute. Product status is active with lower inventory availability (706 pieces). ROHS3 compliance and REACH unaffected status are maintained. Operating temperature range is -55°C to 150°C, which does not extend to the -65°C lower limit of the original specification; this represents a constraint for applications requiring full temperature range coverage.

Selection Logic:

Choose BZT52C2V4S-TP for applications requiring full -65°C to 150°C temperature coverage with standard impedance characteristics. Choose MMXZ5221B-TP for applications where improved voltage regulation (lower impedance) is beneficial and the -55°C to 150°C temperature range is acceptable.

Frequently Asked Questions (FAQ)

Q: Can BZT52C2V4S-TP or MMXZ5221B-TP be used as direct replacements for DDZ2V4ASF-7?

A: Both parts are functionally compatible substitutes within specified electrical and mechanical parameters. The primary consideration is power dissipation: both substitutes are rated at 200 mW versus the original 500 mW. Substitution is valid only if the application power requirement does not exceed 200 mW. Verify circuit design margins accordingly.

Q: What is the difference between SOD-323 and SOD-323F packaging?

A: Both are surface mount packages in the same physical footprint category. SOD-323F is a variant designation used by Diodes Incorporated. The substitute parts use SOD-323 designation from Micro Commercial Co. These packages are mechanically and electrically compatible for PCB assembly purposes.

Q: How do tolerance differences affect circuit performance?

A: The DDZ2V4ASF-7 specifies ±4% tolerance, while BZT52C2V4S-TP specifies ±6% and MMXZ5221B-TP specifies ±5%. At 2.4 V nominal, this translates to voltage variation bands of ±0.096 V (±4%), ±0.144 V (±6%), and ±0.120 V (±5%) respectively. Applications with tight voltage regulation requirements should account for these tolerance differences in design margin calculations.

Q: Why does MMXZ5221B-TP have a lower operating temperature minimum?

A: MMXZ5221B-TP specifies -55°C to 150°C versus the original -65°C to 150°C. This represents a design difference between manufacturers. Applications requiring operation below -55°C must use BZT52C2V4S-TP or the original DDZ2V4ASF-7 (if available from inventory).

Q: What is the significance of impedance differences between substitutes?

A: Impedance (Zzt) affects dynamic voltage regulation. MMXZ5221B-TP provides 30 Ohms maximum impedance versus 100 Ohms for both the original and BZT52C2V4S-TP. Lower impedance results in better voltage stability under transient load conditions. Applications sensitive to voltage ripple or transient response benefit from the lower impedance characteristic.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. Both BZT52C2V4S-TP and MMXZ5221B-TP are ROHS3 compliant with REACH unaffected status, matching the regulatory compliance profile of the original DDZ2V4ASF-7.

Q: What inventory considerations apply to these substitutes?

A: BZT52C2V4S-TP has the highest inventory availability at 3765 pieces. MMXZ5221B-TP has lower availability at 706 pieces. The original DDZ2V4ASF-7 remains available at 2480 pieces but is discontinued at DiGi Electronics, indicating no future restocking.