NZ9F7V5ST5G Equivalent & Substitute Parts

Part Overview

The NZ9F7V5ST5G is a Zener diode manufactured by onsemi, rated at 7.44 V nominal with 250 mW power dissipation in a surface mount SOD-923 package. This component is classified as obsolete, necessitating identification of equivalent alternatives for ongoing production and maintenance applications. Substitute parts must maintain electrical performance within specified tolerances while accommodating available packaging and sourcing options.

Substiute Parts

NZ9F7V5ST5G

onsemiIn Stock: 19526NZ9F7V5ST5G Datasheet

Current PartRFQ

BZX884-C7V5,315

Nexperia USA Inc.In Stock: 1152BZX884-C7V5,315 Datasheet

SimilarRFQ

CDZFHT2RA7.5B

Rohm SemiconductorIn Stock: 5170CDZFHT2RA7.5B Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

• Zener Voltage (Vz): Nominal voltage must fall within the tolerance band of the original specification or within acceptable circuit design margins
• Power Dissipation (P-Max): Substitute must equal or exceed the 250 mW rating
• Voltage Tolerance: Tighter tolerance specifications are acceptable; looser tolerances require circuit validation
• Operating Temperature Range: Must encompass the original -65°C to 150°C specification
• Package Compatibility: Surface mount packages with equivalent footprints and thermal characteristics
• Reverse Leakage Current: Lower leakage is acceptable; higher leakage requires circuit evaluation
• Forward Voltage: Must not exceed specified maximum at rated current
• RoHS and Environmental Compliance: ROHS3 compliance and MSL rating must be maintained

The identified substitutes meet these criteria with the following considerations:

BZX884-C7V5,315 (Nexperia): Zener voltage of 7.5 V falls within acceptable substitution range (0.06 V deviation from 7.44 V nominal). Maintains 250 mW power rating and superior impedance characteristics. Package transition from SOD-923 to DFN1006-2 (SOD-882) requires PCB layout verification. Active product status with automotive qualification (AEC-Q100).

CDZFHT2RA7.5B (Rohm Semiconductor): Zener voltage of 7.44 V matches original specification exactly. Power rating reduced to 100 mW requires circuit thermal analysis. Maintains identical impedance and leakage characteristics. VMN2 package (SOD-923 equivalent) provides direct footprint compatibility. Automotive qualified (AEC-Q101) but classified as Not For New Designs.

Parameter Comparison

Engineering Selection Recommendations

For Active Production Programs:

BZX884-C7V5,315 is the primary substitute for new designs. This part maintains full 250 mW power capability, operates across the required temperature range, and carries active product status with automotive-grade qualification (AEC-Q100). The 7.5 V nominal voltage represents a 0.06 V deviation from the original 7.44 V specification, which is acceptable within typical circuit design tolerances. The transition from SOD-923 to DFN1006-2 (SOD-882) packaging requires PCB layout modification but provides superior thermal performance through reduced impedance (10 Ohms versus 30 Ohms). ROHS3 compliance and unlimited moisture sensitivity rating are maintained.

For Legacy System Maintenance:

CDZFHT2RA7.5B provides direct electrical and mechanical compatibility with the original NZ9F7V5ST5G. The VMN2 package is footprint-equivalent to SOD-923, eliminating PCB redesign requirements. Zener voltage matches the original specification exactly at 7.44 V. However, the reduced power rating of 100 mW requires thermal analysis to confirm adequate dissipation in the target application. This part is classified as Not For New Designs but remains suitable for replacement in existing systems where power dissipation does not exceed 100 mW. Automotive qualification (AEC-Q101) and ROHS3 compliance are maintained.

Compliance Considerations:

Both substitutes maintain ROHS3 compliance, unlimited moisture sensitivity rating (MSL 1), and environmental compliance status. Selection between alternatives should prioritize application thermal requirements and PCB layout constraints.

Frequently Asked Questions (FAQ)

Q: Can BZX884-C7V5,315 be used as a direct replacement without PCB modification?

A: No. BZX884-C7V5,315 uses DFN1006-2 (SOD-882) packaging, which differs from the original SOD-923 footprint. PCB layout modification is required. CDZFHT2RA7.5B uses VMN2 packaging, which is footprint-compatible with SOD-923 and requires no PCB changes.

Q: What is the significance of the 7.5 V nominal voltage in BZX884-C7V5,315 versus the 7.44 V original?

A: The 0.06 V difference represents a 0.8% deviation from the original specification. This falls within typical circuit design tolerances for voltage regulation and protection applications. The ±5% tolerance band of BZX884-C7V5,315 (7.125 V to 7.875 V) overlaps substantially with the ±2% band of the original (7.291 V to 7.589 V).

Q: Why is CDZFHT2RA7.5B rated at only 100 mW when the original is 250 mW?

A: CDZFHT2RA7.5B is a lower-power variant within the same voltage class. Substitution is valid only if circuit thermal analysis confirms that actual power dissipation does not exceed 100 mW under worst-case operating conditions.

Q: Are both substitutes suitable for automotive applications?

A: Yes. BZX884-C7V5,315 carries AEC-Q100 qualification. CDZFHT2RA7.5B carries AEC-Q101 qualification. Both meet automotive-grade reliability standards.

Q: What is the impact of impedance differences between the parts?

A: BZX884-C7V5,315 has lower impedance (10 Ohms) compared to the original and CDZFHT2RA7.5B (both 30 Ohms). Lower impedance provides faster transient response and better voltage regulation characteristics. This is a performance advantage in most applications.

Q: Can these substitutes be used interchangeably in the same circuit?

A: No. Selection depends on specific application requirements. BZX884-C7V5,315 is preferred for new designs requiring full 250 mW dissipation and active product support. CDZFHT2RA7.5B is suitable for legacy system maintenance where power dissipation is limited to 100 mW and PCB redesign is not feasible.

Q: What is the reverse leakage current difference, and does it matter?

A: BZX884-C7V5,315 has 1 µA leakage at 5 V, compared to 500 nA at 4 V for the original and CDZFHT2RA7.5B. Higher leakage may affect precision voltage reference circuits but is typically acceptable for protection and regulation applications.