TZX3V9A-TR Equivalent & Substitute Parts

Part Overview

The TZX3V9A-TR is a 3.9 V Zener diode rated at 500 mW in a DO-35 through-hole package, manufactured by Vishay General Semiconductor - Diodes Division. This component is classified as an active product with automotive-grade qualification (AEC-Q101) and ROHS3 compliance. Substitute parts are identified based on matching electrical specifications, package compatibility, and operational requirements to support design flexibility, inventory optimization, and supply chain continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	3.9	V
Power - Max	500	mW
Package / Case	DO-204AH, DO-35, Axial	—
Mounting Type	Through Hole	—
Operating Temperature Range	-65°C ~ 175°C	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the TZX3V9A-TR are selected based on the following critical parameters:

Primary Matching Criteria:

Zener voltage: 3.9 V nominal (3.8 V acceptable within tolerance)
Power dissipation: 500 mW maximum
Package: DO-35 through-hole axial configuration
Mounting type: Through-hole

Secondary Compatibility Factors:

Operating temperature range (minimum -65°C, maximum ≥175°C)
RoHS compliance status
Impedance and leakage characteristics within acceptable operational limits

All substitute parts listed maintain the core electrical specifications and physical package requirements necessary for direct circuit substitution. Variations in impedance, forward voltage, and leakage current are within acceptable engineering tolerances for Zener diode applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vz (Nom) [V]	Tolerance [%]	Power Max [mW]	Zzt Max [Ω]	Vf Max @ If [V @ mA]	Ir @ Vr [µA @ V]	Temp Range [°C]	Package	RoHS
TZX3V9A-TR	Vishay	3.9	—	500	100	1.5 @ 200	5 @ 1	-65 ~ 175	DO-35	ROHS3
1N5228B TR PBFREE	Central Semiconductor	3.9	±5	500	23	1.1 @ 200	10 @ 1	-65 ~ 200	DO-35	ROHS3
1N5228BTR	Fairchild Semiconductor	3.9	±5	500	23	1.2 @ 200	10 @ 1	-65 ~ 200	DO-35	—
1N748A-1	Microchip Technology	3.9	±5	500	20	1.1 @ 200	2 @ 1	-65 ~ 175	DO-35	Non-compliant
BZX79C3V9	Taiwan Semiconductor	3.9	±5	500	90	1.5 @ 100	10 @ 1	-65 ~ 175	DO-35	ROHS3
BZX79C3V9-T50A	onsemi	3.9	±5	500	90	1.5 @ 100	10 @ 1	-65 ~ 200	DO-35	ROHS3
NZX3V9A,133	Nexperia USA Inc.	3.8	±3	500	100	1.5 @ 200	3 @ 1	-55 ~ 175	ALF2	ROHS3

Engineering Selection Recommendations

Tier 1 - Direct Substitutes (Preferred):

1N5228BTR (Fairchild Semiconductor) and 1N5228B TR PBFREE (Central Semiconductor) are optimal substitutes. Both maintain 3.9 V nominal Zener voltage, 500 mW power rating, DO-35 package, and extended operating temperature to 200°C. Both are ROHS3 compliant. The 1N5228B TR PBFREE variant includes explicit lead-free designation.

BZX79C3V9-T50A (onsemi) is a direct substitute with identical electrical specifications, ROHS3 compliance, and extended temperature range to 200°C. This part is available in higher inventory quantity (16,044 pcs).

Tier 2 - Compatible Substitutes:

BZX79C3V9 (Taiwan Semiconductor) matches all core specifications with ROHS3 compliance and identical temperature range to the main part (-65°C ~ 175°C).

1N748A-1 (Microchip Technology) meets electrical specifications but carries RoHS non-compliance status. Use only in applications where RoHS compliance is not required.

Tier 3 - Limited Compatibility:

NZX3V9A,133 (Nexperia USA Inc.) operates at 3.8 V nominal (within ±3% tolerance) with different package designation (ALF2 vs. DO-35). Minimum operating temperature is -55°C, which does not meet the -65°C requirement of the main part. This part is suitable only for applications with relaxed temperature specifications.

Frequently Asked Questions (FAQ)

Q: Can I use 1N5228BTR as a direct replacement for TZX3V9A-TR?

A: Yes. Both parts share identical nominal Zener voltage (3.9 V), power rating (500 mW), and DO-35 package configuration. The 1N5228BTR operates across an extended temperature range (-65°C ~ 200°C) and is ROHS3 compliant, making it suitable for direct circuit substitution.

Q: What is the difference between the BZX79C3V9 and BZX79C3V9-T50A variants?

A: Both parts are electrically identical with 3.9 V Zener voltage and 500 mW power rating. The BZX79C3V9-T50A is supplied in Cut Tape (CT) packaging and supports extended operating temperature to 200°C, compared to 175°C for the BZX79C3V9. Both are ROHS3 compliant.

Q: Why is NZX3V9A,133 listed as a substitute if it has a different package?

A: NZX3V9A,133 is included because it meets the core electrical requirements (3.9 V nominal Zener voltage, 500 mW power rating, through-hole mounting). However, the ALF2 package differs from the DO-35 standard. Additionally, the minimum operating temperature (-55°C) does not extend to -65°C. This part is suitable only for applications with relaxed thermal and package requirements.

Q: Is RoHS compliance a critical factor for substitution?

A: RoHS compliance status is determined by application requirements and regulatory jurisdiction. The main part (TZX3V9A-TR) and most substitute parts are ROHS3 compliant. The 1N748A-1 is RoHS non-compliant and should be used only in applications where RoHS compliance is not mandated.

Q: What does impedance (Zzt) variation mean for circuit performance?

A: Impedance variation affects Zener diode dynamic response and voltage regulation characteristics. The main part specifies 100 Ω maximum impedance. Substitute parts range from 20 Ω to 100 Ω. Lower impedance values (1N5228B, 1N748A-1) provide improved voltage regulation stability. Higher impedance values (BZX79C3V9, BZX79C3V9-T50A) are acceptable for general-purpose applications. Selection depends on circuit regulation requirements.

Q: Can I substitute based on packaging alone?

A: No. All substitute parts must match the core electrical specifications (Zener voltage, power rating, operating temperature range) in addition to package compatibility. Package matching alone is insufficient for functional equivalence.

Q: What inventory considerations apply to these substitutes?

A: Inventory availability varies significantly. The 1N5228BTR has the highest stock level (30,663 pcs), followed by BZX79C3V9-T50A (16,044 pcs). The main part TZX3V9A-TR has 742 pcs available. Substitute selection may be influenced by supply chain requirements and lead time considerations.

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