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SMAJ5943B-TP
Micro Commercial Co
Interface
75237 Pcs New Original In Stock
Zener Diode 56 V 1.5 W ±5% Surface Mount DO-214AC (SMA)
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5.0 / 5.0
- (137 Ratings)
SMAJ5943B-TP
Product Overview
12994770
DiGi Electronics Part Number
SMAJ5943B-TP-DGManufacturer
Micro Commercial Co
SMAJ5943B-TP
Description
InterfaceInventory
75237 Pcs New Original In Stock
Zener Diode 56 V 1.5 W ±5% Surface Mount DO-214AC (SMA)
Quantity
Minimum 1
Minimum 1
Purchase and inquiry
Warranty & Returns
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SMAJ5943B-TP Technical Specifications
Category
Diodes, Zener, Single Zener Diodes
Packaging
Bulk
Series
-
Product Status
Active
Voltage - Zener (Nom) (Vz)
56 V
Tolerance
±5%
Power - Max
1.5 W
Impedance (Max) (Zzt)
86 Ohms
Current - Reverse Leakage @ Vr
1 µA @ 42.6 V
Voltage - Forward (Vf) (Max) @ If
1.5 V @ 200 mA
Operating Temperature
150°C (TJ)
Mounting Type
Surface Mount
Package / Case
DO-214AC, SMA
Supplier Device Package
DO-214AC (SMA)
Base Product Number
SMAJ5943
Datasheet & Documents
HTML Datasheet
SMAJ5943B-TP-DG
Environmental & Export Classification
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8541.10.0050
Additional Information
Other Names
353-SMAJ5943B-TP
Standard Package
1
Alternative Parts
PART NUMBER
MANUFACTURER
QUANTITY AVAILABLE
DiGi PART NUMBER
UNIT PRICE
SUBSTITUTE TYPE
SML4758HE3/5A
Vishay General Semiconductor - Diodes Division
861
SML4758HE3/5A-DG
0.0865
MFR Recommended
SML4758HE3/61
Vishay General Semiconductor - Diodes Division
971
SML4758HE3/61-DG
0.0865
MFR Recommended
Reviews
5.0/5.0-(Show up to 5 Ratings)
Dec 02, 2025
手頃な価格と迅速配送により、買い替えもスムーズに行えました。
Dec 02, 2025
問い合わせに対し、即座に対応してくれる点が非常に信頼できます。
Dec 02, 2025
The team is always proactive in follow-up, ensuring that I am completely satisfied with my purchase.
Dec 02, 2025
Their inventory management minimizes delays and maximizes efficiency.
Dec 02, 2025
Support staff is fantastic, addressing concerns immediately.
Dec 02, 2025
Great prices and an easy-to-navigate site—what more could I ask for?
Dec 02, 2025
They always ship my orders the same day I place them, which is fantastic.
Dec 02, 2025
The high durability of their components means I rarely need to swap out parts prematurely.
Dec 02, 2025
The consistency of their products is unmatched in the industry.
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Frequently Asked Questions (FAQ)
Can I use the SMAJ5943B-TP Zener diode as a direct replacement for the BZX84C56LT1G in a 48V industrial power supply clamping circuit?
The SMAJ5943B-TP (56V ±5%, 1.5W) can technically replace the BZX84C56LT1G (56V ±5%, 0.3W) in voltage regulation or transient clamping applications, but only if power dissipation and thermal management are carefully evaluated. The SMAJ5943B-TP’s higher power rating (1.5W vs. 0.3W) makes it more robust for surge events, but its larger SMA package may not fit compact PCB layouts designed for the SOT-23-packaged BZX84C56LT1G. Additionally, the SMAJ5943B-TP has a higher dynamic impedance (86Ω max vs. ~20Ω typical for the BZX84C), which may affect regulation accuracy under varying load currents. Always verify thermal derating at your operating ambient temperature and ensure adequate copper pour for heat dissipation.
What are the risks of using the SMAJ5943B-TP in a high-frequency switching node snubber circuit operating at 200 kHz?
Using the SMAJ5943B-TP in a 200 kHz snubber circuit introduces risk due to its relatively slow reverse recovery characteristics and higher junction capacitance typical of 1.5W Zener diodes in SMA packages. While it can clamp voltage transients, repeated high-frequency switching may cause localized heating and premature failure due to accumulated switching losses. The 86Ω max impedance also limits its effectiveness in fast transient suppression compared to TVS diodes or fast-recovery Zeners. For reliable operation, consider a dedicated high-speed TVS like the SMAJ58A or evaluate thermal rise under worst-case duty cycle—especially since the SMAJ5943B-TP’s 150°C TJ max leaves limited margin in enclosed environments.
How does the SMAJ5943B-TP perform under sustained overvoltage conditions near its 56V Zener threshold in a 48V automotive load dump scenario?
The SMAJ5943B-TP is rated for 1.5W continuous power, but sustained overvoltage near 56V—such as during an ISO 7637-2 load dump event—can push it beyond safe operating limits if not current-limited. At 56V, even 27mA of current exceeds its 1.5W rating (P = V × I). Without a series resistor or active current limiting, the diode may thermally runaway and fail short-circuit, potentially compromising downstream circuitry. Designers should include a current-limiting resistor sized for worst-case input voltage and verify thermal performance with transient duration in mind. For robust automotive applications, consider pairing the SMAJ5943B-TP with a fuse or using a higher-energy TVS diode rated specifically for load dump (e.g., SMAJ58CA).
Is the SMAJ5943B-TP suitable for precision voltage reference applications in a 12-bit ADC analog front-end?
The SMAJ5943B-TP is not recommended for precision voltage reference roles in 12-bit ADC systems due to its ±5% tolerance, relatively high dynamic impedance (86Ω max), and sensitivity to temperature and bias current variations. Even minor fluctuations in leakage current (1µA @ 42.6V) or self-heating can introduce reference drift exceeding 1 LSB in a 3.3V system. For such applications, use a dedicated low-noise, temperature-stabilized reference IC like the REF5050 (5.0V, ±0.05%) or a precision Zener with tighter specs. The SMAJ5943B-TP is better suited for overvoltage protection or coarse clamping where absolute accuracy is less critical.
Can I parallel two SMAJ5943B-TP diodes to increase power handling in a 60V rail protection circuit, and what are the reliability concerns?
Paralleling two SMAJ5943B-TP diodes to share power in a 60V protection circuit is risky and generally not advised due to inherent mismatches in Zener voltage (±5% tolerance) and thermal coupling. The diode with slightly lower Vz will conduct more current, leading to thermal imbalance and potential thermal runaway—even with matched parts. Without individual ballast resistors (which add complexity and reduce response speed), current sharing will be uneven, negating the benefit of higher power handling. Instead, select a single higher-power device like the SMCJ56A (15W peak) or use a properly rated TVS array. If you must parallel, include 1–2Ω series resistors per diode and ensure tight thermal coupling on the PCB, but this approach still reduces overall reliability and is not recommended for mission-critical designs.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
SMAJ5943B-TP CAD Models
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