PZM7.5NB1,115 Equivalent & Substitute Parts

Part Overview

The PZM7.5NB1,115 is a Zener diode manufactured by NXP USA Inc., rated at 7.5 V nominal voltage with 300 mW power dissipation capability. This component is designed for surface mount applications in the SMT3/MPAK package configuration. The part is currently classified as obsolete, making identification of functionally equivalent substitutes essential for ongoing design support and production continuity. Equivalent alternatives must maintain the same electrical specifications while accommodating modern active product availability.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	7.5	V
Tolerance	±2%	-
Power - Max	300	mW
Impedance (Max)	10	Ohms
Current - Reverse Leakage @ Vr	1	µA @ 4 V
Voltage - Forward (Max) @ If	1.1	V @ 100 mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	-
Package / Case	TO-236-3, SC-59, SOT-23-3	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the PZM7.5NB1,115 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Criteria:

Zener voltage: 7.5 V nominal with ±2% tolerance
Package compatibility: TO-236-3, SC-59, or SOT-23-3 surface mount configurations
Operating temperature range: -65°C to 150°C minimum
RoHS3 compliance and REACH unaffected status
Reverse leakage current: 1 µA maximum at specified reverse voltage

Allowable Variation Parameters:

Power dissipation: Minimum 300 mW (higher ratings acceptable)
Impedance (Zzt): Up to 15 Ohms (original specification 10 Ohms maximum)
Forward voltage: Variations acceptable within standard diode characteristics
Product status: Active products preferred for obsolete part replacement

Two substitute parts meet these criteria and are listed below.

Parameter Comparison

Parameter	PZM7.5NB1,115 (NXP)	BZX84B7V5-7-F (Diodes Inc.)	BZX84-B7V5,215 (Nexperia)
Voltage - Zener (Nom)	7.5 V	7.5 V	7.5 V
Tolerance	±2%	±2%	±2%
Power - Max	300 mW	300 mW	250 mW
Impedance (Max)	10 Ohms	15 Ohms	15 Ohms
Current - Reverse Leakage @ Vr	1 µA @ 4 V	1 µA @ 5 V	1 µA @ 5 V
Operating Temperature	-65°C to 150°C	-65°C to 150°C	-65°C to 150°C
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active

Engineering Selection Recommendations

BZX84B7V5-7-F (Diodes Incorporated) is the primary substitute for PZM7.5NB1,115. This part maintains full electrical equivalence with 300 mW power rating, identical zener voltage and tolerance specifications, and compatible SOT-23-3 packaging. The part is in active production status with high inventory availability (44,828 pcs), ensuring supply chain continuity. RoHS3 compliance and REACH unaffected status match the original specification.

BZX84-B7V5,215 (Nexperia USA Inc.) is an alternative substitute with automotive-grade qualification (AEC-Q101). This part meets all critical electrical parameters with the exception of power dissipation, rated at 250 mW versus the original 300 mW specification. Selection of this part is appropriate for applications where power dissipation does not exceed 250 mW. The automotive qualification provides additional reliability assurance for demanding environments. Active production status and substantial inventory (40,750 pcs) support production requirements.

Both substitutes are compatible with existing PCB layouts designed for TO-236-3/SOT-23-3 packages and require no circuit modifications.

Frequently Asked Questions (FAQ)

Q: Can BZX84B7V5-7-F directly replace PZM7.5NB1,115 without PCB modifications?

A: Yes. Both parts use identical TO-236-3/SOT-23-3 surface mount packages with the same pinout and footprint. No PCB layout changes are required.

Q: What is the significance of the impedance difference (10 Ohms vs. 15 Ohms)?

A: Impedance (Zzt) represents the dynamic resistance of the zener diode at specified test conditions. The substitute parts with 15 Ohms impedance remain within acceptable engineering tolerances for standard zener applications. This parameter does not affect pin compatibility or basic circuit function.

Q: Why does BZX84-B7V5,215 have lower power rating (250 mW vs. 300 mW)?

A: The BZX84-B7V5,215 is rated for 250 mW maximum power dissipation. This part is suitable for applications where actual power dissipation remains below 250 mW. For applications requiring the full 300 mW capability, BZX84B7V5-7-F is the appropriate selection.

Q: Are both substitute parts RoHS3 compliant?

A: Yes. Both BZX84B7V5-7-F and BZX84-B7V5,215 are ROHS3 compliant and REACH unaffected, matching the environmental compliance status of the original PZM7.5NB1,115.

Q: What is the difference between standard and automotive-grade versions?

A: BZX84-B7V5,215 carries AEC-Q101 automotive qualification, indicating compliance with automotive reliability and testing standards. This qualification is optional for non-automotive applications but provides additional assurance for high-reliability environments.

Q: Can I use these substitutes interchangeably in the same design?

A: BZX84B7V5-7-F is the direct equivalent with no power rating compromise. BZX84-B7V5,215 is suitable when application power dissipation does not exceed 250 mW. Verify actual circuit power requirements before selecting between these options.

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