BZT52C39LP-TP Equivalent & Substitute Parts

Part Overview

The BZT52C39LP-TP is a Zener diode rated at 39 V nominal with 250 mW power dissipation, manufactured by Micro Commercial Co in SOD-882 surface mount package. This component is classified as obsolete, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical performance within the specified voltage, power, and thermal operating parameters while accommodating package and compliance requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	39	V
Power - Max	250	mW
Tolerance	±5%	—
Impedance (Max)	130	Ohms
Current - Reverse Leakage @ Vr	100	nA @ 27.3 V
Voltage - Forward (Vf) (Max) @ If	900	mV @ 10 mA
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOD-882	—

Substitute Part Grouping Explanation

Substitution of the BZT52C39LP-TP is determined by equivalence across the following critical parameters:

Electrical Equivalence Criteria:

Zener voltage: 39 V nominal
Power rating: 250 mW maximum
Impedance: 130 Ohms maximum
Reverse leakage current: within specified limits
Forward voltage: 900 mV maximum at 10 mA

Mechanical & Environmental Criteria:

Surface mount technology
SOD-882 package compatibility
Operating temperature range: -65°C to 150°C
RoHS3 compliance
Moisture sensitivity level 1 (unlimited)

Tolerance Consideration: Substitute parts with ±2% tolerance (tighter than the original ±5%) provide enhanced precision while maintaining backward compatibility with circuits designed for ±5% tolerance specifications.

The identified substitutes (BZX884-B39,315 and BZX884-C39,315) from Nexperia USA Inc. satisfy all electrical and mechanical parameters. Both are active products with automotive-grade qualification (AEC-Q100), providing superior availability and long-term supply assurance compared to the obsolete original part.

Parameter Comparison

Parameter	BZT52C39LP-TP	BZX884-B39,315	BZX884-C39,315
Manufacturer	Micro Commercial Co	Nexperia USA Inc.	Nexperia USA Inc.
Voltage - Zener (Nom)	39 V	39 V	39 V
Tolerance	±5%	±2%	±5%
Power - Max	250 mW	250 mW	250 mW
Impedance (Max)	130 Ohms	130 Ohms	130 Ohms
Current - Reverse Leakage @ Vr	100 nA @ 27.3 V	50 nA @ 27.3 V	50 nA @ 27.3 V
Voltage - Forward (Vf) (Max) @ If	900 mV @ 10 mA	900 mV @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-882	SOD-882	SOD-882
Product Status	Obsolete	Active	Active
Grade	—	Automotive	Automotive
Qualification	—	AEC-Q100	AEC-Q100
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

BZX884-C39,315 (Primary Substitute): This part is the direct functional equivalent with matching ±5% tolerance specification. It is an active product with automotive-grade qualification and AEC-Q100 certification, ensuring long-term availability and supply chain stability. Inventory availability (41,064 pcs) supports immediate procurement. This part is suitable for direct replacement in existing designs without circuit modification.

BZX884-B39,315 (Alternative Substitute): This part offers tighter ±2% tolerance specification while maintaining all other electrical and mechanical parameters. It is also an active automotive-grade product with AEC-Q100 qualification. The improved tolerance specification provides enhanced circuit precision for applications requiring tighter voltage regulation. Inventory availability (29,636 pcs) supports procurement requirements. This part is suitable for new designs or applications where improved tolerance performance is beneficial.

Both substitutes are manufactured by Nexperia USA Inc., an established semiconductor supplier with automotive qualification credentials. The transition from the obsolete BZT52C39LP-TP to either active substitute eliminates supply chain risk while maintaining full electrical and mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can BZX884-B39,315 or BZX884-C39,315 be used as direct replacements for BZT52C39LP-TP?

A: Yes. Both parts are electrically and mechanically equivalent. They share identical zener voltage (39 V), power rating (250 mW), impedance (130 Ohms), forward voltage characteristics, operating temperature range (-65°C to 150°C), and SOD-882 package configuration. Both are RoHS3 compliant with MSL 1 rating.

Q: What is the difference between BZX884-B39,315 and BZX884-C39,315?

A: The primary difference is tolerance specification. BZX884-B39,315 has ±2% tolerance, while BZX884-C39,315 has ±5% tolerance matching the original part. Both have identical electrical performance and reverse leakage characteristics (50 nA @ 27.3 V, which is lower than the original 100 nA specification). Both are automotive-grade with AEC-Q100 qualification.

Q: Why are the substitute parts automotive-grade when the original part is not specified as such?

A: Automotive-grade qualification (AEC-Q100) and active product status indicate superior manufacturing process control, reliability testing, and long-term supply commitment. These characteristics provide additional assurance for applications requiring consistent performance and availability.

Q: Are there any package compatibility concerns?

A: No. All three parts use SOD-882 surface mount package with identical mechanical dimensions and land pattern requirements. PCB layout and assembly processes require no modification.

Q: What is the significance of the lower reverse leakage current in the substitute parts?

A: The substitute parts specify 50 nA @ 27.3 V reverse leakage compared to 100 nA for the original part. This represents improved leakage performance and is fully compatible with circuits designed for the original specification, as the substitute parts perform within tighter limits.

Q: Which substitute should be selected for new designs?

A: BZX884-C39,315 is recommended for new designs as it maintains the original ±5% tolerance specification while providing active product status and automotive qualification. BZX884-B39,315 is suitable when improved ±2% tolerance performance is required by circuit specifications.

Q: Are compliance certifications equivalent across all three parts?

A: All three parts are RoHS3 compliant with MSL 1 (unlimited moisture sensitivity level). The substitute parts carry additional automotive-grade qualification and AEC-Q100 certification, which exceeds the original part's compliance profile.

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