PZM24NB,115 Equivalent & Substitute Parts

Part Overview

The PZM24NB,115 is a Zener diode rated at 24 V nominal voltage with 300 mW maximum power dissipation, manufactured by NXP USA Inc. in Surface Mount Technology (SMT3/MPAK package). This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across a temperature range of -65°C to 150°C and maintains ±5% voltage tolerance with ROHS3 compliance.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	24	V
Tolerance	±5%	%
Power - Max	300	mW
Impedance (Max)	30	Ohms
Current - Reverse Leakage @ Vr	70 nA @ 19 V	nA
Voltage - Forward (Max) @ If	1.1 V @ 100 mA	V
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	—
MSL Rating	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the PZM24NB,115 are qualified based on the following electrical and mechanical parameters:

Primary Substitution Criteria:

Zener voltage: 24 V nominal with ±5% tolerance
Power rating: 300 mW maximum (or higher)
Package compatibility: TO-236-3, SC-59, SOT-23-3 surface mount packages
Operating temperature range: -65°C to 150°C minimum
Regulatory compliance: ROHS3 compliant

Secondary Compatibility Parameters:

Impedance (Zzt): Maximum 30 Ohms (or lower for improved regulation)
Reverse leakage current: Specified at rated reverse voltage
Forward voltage: Specified at rated forward current
Moisture sensitivity: MSL 1 or equivalent

Parts meeting all primary criteria are classified as direct substitutes. Variations in secondary parameters (impedance, leakage current, forward voltage) remain within acceptable engineering tolerances for Zener diode applications.

Parameter Comparison

Parameter	PZM24NB,115 (Main)	CZRT5252B-G (Comchip)	BZX84-C24,215 (NXP)
Manufacturer	NXP USA Inc.	Comchip Technology	NXP Semiconductors
Voltage - Zener (Nom)	24 V	24 V	24 V
Tolerance	±5%	±5%	±5%
Power - Max	300 mW	300 mW	250 mW
Impedance (Max)	30 Ohms	33 Ohms	70 Ohms
Current - Reverse Leakage @ Vr	70 nA @ 19 V	100 nA @ 18 V	50 nA @ 16.8 V
Voltage - Forward (Max) @ If	1.1 V @ 100 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65 to 150°C	-65 to 150°C	-65 to 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
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
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Automotive Grade	—	—	AEC-Q101

Engineering Selection Recommendations

CZRT5252B-G (Comchip Technology) - Primary Substitute

The CZRT5252B-G is an active product with electrical specifications closely matching the PZM24NB,115. Both parts share identical zener voltage (24 V), tolerance (±5%), power rating (300 mW), and operating temperature range (-65°C to 150°C). Package compatibility is confirmed across TO-236-3, SC-59, and SOT-23-3 formats. The impedance specification (33 Ohms maximum) is marginally higher than the original (30 Ohms maximum) but remains within acceptable engineering tolerances for Zener regulation applications. ROHS3 compliance and MSL 1 rating match the original part requirements. Current inventory availability (726 Pcs) supports production continuity.

BZX84-C24,215 (NXP Semiconductors) - Secondary Substitute

The BZX84-C24,215 is an active NXP product with AEC-Q101 automotive qualification. This part maintains the 24 V nominal zener voltage, ±5% tolerance, and full operating temperature range. Package compatibility is confirmed. The power rating is specified at 250 mW, which is 50 mW lower than the original 300 mW specification. The impedance specification (70 Ohms maximum) is significantly higher than the original part. These differences indicate the BZX84-C24,215 is suitable for applications where the lower power dissipation and higher impedance are acceptable. The automotive qualification (AEC-Q101) provides additional reliability assurance for qualified applications. Current inventory availability (470,901 Pcs) ensures supply continuity.

Selection Basis:

Both substitute parts are active products, eliminating obsolescence risk
Both maintain the critical 24 V zener voltage specification with ±5% tolerance
Both support the full -65°C to 150°C operating temperature range
Both are ROHS3 compliant and carry MSL 1 ratings
Package compatibility is confirmed for all three parts
CZRT5252B-G provides closest electrical match to the original specification
BZX84-C24,215 offers automotive-grade qualification for applicable designs

Frequently Asked Questions (FAQ)

Q: Can CZRT5252B-G directly replace PZM24NB,115 in existing designs?

A: Yes. The CZRT5252B-G meets all primary substitution criteria: 24 V nominal zener voltage, ±5% tolerance, 300 mW power rating, identical operating temperature range (-65°C to 150°C), and compatible TO-236-3/SC-59/SOT-23-3 packages. The impedance specification (33 Ohms maximum) is marginally higher than the original (30 Ohms maximum) but remains within acceptable tolerances for Zener regulation circuits. ROHS3 compliance and MSL 1 rating match the original part.

Q: What are the key differences between CZRT5252B-G and BZX84-C24,215?

A: Both parts share the 24 V nominal zener voltage and ±5% tolerance. The CZRT5252B-G matches the original 300 mW power rating, while BZX84-C24,215 is rated at 250 mW. The CZRT5252B-G impedance (33 Ohms maximum) is lower than BZX84-C24,215 (70 Ohms maximum), providing better voltage regulation. BZX84-C24,215 includes AEC-Q101 automotive qualification. Both support the full -65°C to 150°C operating temperature range and are ROHS3 compliant.

Q: Is the impedance difference between PZM24NB,115 (30 Ohms) and CZRT5252B-G (33 Ohms) significant?

A: The 3 Ohm difference represents a 10% increase in maximum impedance. For most Zener regulation applications, this variation remains within acceptable engineering tolerances. Applications requiring impedance specifications tighter than ±10% should evaluate circuit performance with the substitute part's impedance value.

Q: Can BZX84-C24,215 be used in applications requiring 300 mW power dissipation?

A: BZX84-C24,215 is rated at 250 mW maximum power dissipation, which is 50 mW lower than the original PZM24NB,115 specification. This part is suitable only for applications where the actual power dissipation does not exceed 250 mW. Applications requiring the full 300 mW capability should use CZRT5252B-G.

Q: Are all three parts available in the same package format?

A: Yes. PZM24NB,115, CZRT5252B-G, and BZX84-C24,215 are all available in TO-236-3, SC-59, and SOT-23-3 surface mount packages. Physical footprint compatibility is confirmed across all three parts.

Q: What is the significance of AEC-Q101 qualification on BZX84-C24,215?

A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. BZX84-C24,215 carries this qualification, indicating it meets automotive reliability and performance requirements. This qualification is relevant only for applications requiring automotive-grade components. Non-automotive applications do not require this qualification.

Q: Are there any regulatory compliance differences between the substitute parts?

A: All three parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings. REACH status is unaffected for all parts. No regulatory compliance differences exist between PZM24NB,115, CZRT5252B-G, and BZX84-C24,215.

Q: Which substitute part should be selected for new designs?

A: CZRT5252B-G is recommended for new designs requiring direct electrical equivalence to PZM24NB,115. This part maintains the 300 mW power rating, lower impedance specification (33 Ohms), and active product status. BZX84-C24,215 is recommended for automotive-qualified applications where the 250 mW power rating and AEC-Q101 qualification are acceptable.

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