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Microchip Technology SMAJ4758CE3/TR13
- Part No.:
- SMAJ4758CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4758CE3/TR13.pdf
- Description:
- DIODE ZENER 56V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,809
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Product details
Overview
SMAJ4758CE3/TR13 from Vishay Semiconductor is a 2 W, 56 V ±2% tolerance silicon Zener diode in DO-214AC (SMA) package, rated for 80 A peak surge current and 32 mA maximum regulator current at 100°C, used for precision voltage regulation and overvoltage protection in power supply feedback loops and I/O clamp circuits.
For engineers reviewing the SMAJ4758CE3/TR13 datasheet, SMAJ4758CE3/TR13 pinout, SMAJ4758CE3/TR13 application, or SMAJ4758CE3/TR13 equivalent, key selection criteria include its 2% voltage tolerance, 110 Ω dynamic impedance at 4.5 mA test current, 5 µA reverse leakage at 42.6 V, and UL94V-0 flame-retardant surface-mount compatibility.
Technical Context
This Zener diode operates in reverse breakdown mode with sharp knee characteristics verified by dual-point Zener impedance measurement per Note 2. Its thermal resistance of 25°C/W (junction-to-lead) enables stable regulation under pulsed surge conditions when mounted on 4.0 mm² copper pads per terminal.
The device complies with JEDEC DO-214AC mechanical outline (with note that max dimension A exceeds standard JEDEC by 0.010"), features cathode band polarity marking, and supports soldering at 260°C for 10 seconds per MIL-STD-750 Method 2026.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 56 V ±2% - precise reference for feedback networks requiring tight regulation stability |
| Test Current (IZT) | 4.5 mA - operating point where Zener voltage and dynamic impedance are specified |
| Dynamic Impedance (ZZT) | 110 Ω @ 4.5 mA - low AC impedance ensures minimal voltage deviation under varying load currents |
| Reverse Leakage (IR) | 5 µA @ 42.6 V - low leakage preserves accuracy in high-impedance bias or sensing paths |
| Peak Surge Current (IS) | 80 A - withstands transient overvoltage events per 1/120 sec half-sine pulse |
| Power Dissipation (PAV) | 2.0 W - sustained regulation capability with derating above 100°C ambient |
| Junction Temp Range | –55°C to +150°C - suitable for automotive under-hood and industrial control environments |
Pinout & Package
DO-214AC (SMA) surface-mount package with molded epoxy body, cathode indicated by band-marked end; terminals solderable per MIL-STD-750 Method 2026; compatible with automated pick-and-place and reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage reference node | Connected to ground or lower-potential rail in shunt regulation configuration |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input rail or protected node; voltage clamped to 56 V ±2% |
Key Features
| Feature | Design Value |
|---|---|
| 2% Zener voltage tolerance | Enables tighter closed-loop regulation in SMPS feedback without external trimming |
| UL94V-0 flame-retardant epoxy | Meets safety requirements for consumer and industrial PCBs with high-density layouts |
| 80 A peak surge rating | Provides robust ESD and lightning-induced transient suppression in DC power rails |
| Sharp knee impedance characterization | Guarantees stable regulation onset and eliminates unstable breakdown behavior |
| JEDEC DO-214AC mechanical compliance | Ensures compatibility with standard SMA footprint land patterns and assembly tooling |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Signal Clamping |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 56 V threshold to TL431-like control IC input. Use Value: 2% tolerance and 110 Ω dynamic impedance minimize output voltage drift across line/load/temperature. | Use Scenario: Protecting analog front-end inputs of PLC modules from field-wiring transients. IC Role / Device Role / Timing Role: Bidirectional overvoltage clamp limiting sensor signal swing to ±56 V relative to ground. Use Value: 80 A surge rating absorbs repetitive 1 kV/µs fast transients without degradation. |
| Automotive Body Control Module (BCM) | Telecom DC Power Distribution |
Use Scenario: Stabilizing 12 V rail monitoring circuitry in engine bay electronics exposed to load dump. IC Role / Device Role / Timing Role: Zener clamp absorbing ISO 7637-2 Pulse 5a (load dump) energy before it reaches MCU voltage supervisor. Use Value: –55°C to +150°C operation and 2.0 W steady-state dissipation sustain reliability during thermal cycling. | Use Scenario: Providing secondary overvoltage protection on –48 V telecom rectifier outputs. IC Role / Device Role / Timing Role: Parallel-connected shunt regulator holding bus voltage below 56 V during upstream regulator failure. Use Value: Low 5 µA leakage at 42.6 V prevents unnecessary power loss in always-on backup systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C56LT1G | 300 mW SOT-23 package; 5% tolerance; 100 Ω ZZT @ 5 mA | Limited to low-power signal-level clamping; not rated for 80 A surge | Select for space-constrained PCBs where surge immunity is secondary to footprint size |
| 1N4758A | Through-hole DO-41; 5% tolerance; same 56 V nominal but higher ZZT (120 Ω) | Requires wave soldering; incompatible with automated SMT lines | Select only for legacy through-hole designs or prototyping with breadboard adapters |
Compared with BZX84-C56LT1G and 1N4758A, SMAJ4758CE3/TR13 uniquely delivers 2 W power handling, 2% tolerance, and 80 A surge capability in a surface-mount DO-214AC package-making it the only option for production-grade 56 V shunt regulation in automotive and industrial power systems.
Availability
SMAJ4758CE3/TR13 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, automotive body control modules, and telecom DC distribution systems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ4758CE3/TR13 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay Semiconductor is a global leader in discrete semiconductors and passive components, specializing in high-reliability devices for automotive, industrial, and computing markets.
SMAJ4758CE3/TR13 belongs to Vishay's SMAJ series of 2 W Zener diodes engineered for precision voltage reference and transient overvoltage protection in demanding surface-mount power applications.
FAQ
What is the Zener voltage tolerance of SMAJ4758CE3/TR13?
The SMAJ4758CE3/TR13 has a Zener voltage tolerance of ±2%, denoted by the 'C' suffix in its part number. This is confirmed in the datasheet Note 1, which states that 'C' signifies 2% tolerance, and the Electrical Characteristics table lists VZ = 56 V for SMAJ4758A (base part), with the 'C' variant maintaining that nominal value at tighter tolerance. This enables high-accuracy regulation in feedback circuits where ±5% parts would introduce unacceptable error.
What is the maximum steady-state power dissipation for SMAJ4758CE3/TR13?
The SMAJ4758CE3/TR13 has a steady-state power dissipation rating of 2.0 W at 25°C, as specified in the Maximum Ratings table. Derating is linear above 100°C ambient, reaching zero power at 150°C junction temperature. This rating assumes mounting on 4.0 mm² copper pads per terminal, per Note 2 and Note 3 in the datasheet, and defines the continuous DC power-handling capability for shunt regulation use cases.
Does SMAJ4758CE3/TR13 meet UL94V-0 flammability requirements?
Yes, SMAJ4758CE3/TR13 uses flame-retardant epoxy meeting UL94V-0, as explicitly stated in the Mechanical Data section. This certification ensures the package material self-extinguishes within 10 seconds after flame removal and does not drip flaming particles-critical for safety compliance in consumer electronics, industrial controls, and automotive modules where fire risk mitigation is mandated.
What is the peak surge current rating for SMAJ4758CE3/TR13?
The peak surge current rating for SMAJ4758CE3/TR13 is 80 A, measured using a ½ sine-wave pulse of 1/120 second duration at 25°C ambient, as defined in Note 3 of the Electrical Characteristics table. This rating reflects the device's ability to absorb transient energy from events like ESD, load dump, or inductive switching without failure, making it suitable for primary overvoltage protection in DC power rails.
How is polarity marked on SMAJ4758CE3/TR13?
Polarity on SMAJ4758CE3/TR13 is indicated by a cathode band-a visible molded ring near one end of the DO-214AC (SMA) package. As stated in the Mechanical Data section, this band identifies the cathode terminal, which must be connected to the higher-potential node (e.g., input rail or protected signal line) in Zener regulation or clamping configurations, while the anode connects to ground or lower potential.
SMAJ4758CE3/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 56 V
- Tolerance:
- ±2%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 110 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 42.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC
SMAJ4758CE3/TR13 FAQ
1.How can I place an order for SMAJ4758CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4758CE3/TR13 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMAJ4758CE3/TR13 reliable?
The price and inventory of SMAJ4758CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4758CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4758CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4758CE3/TR13 transactions.
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4.How is shipping managed for SMAJ4758CE3/TR13?
SMAJ4758CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4758CE3/TR13 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMAJ4758CE3/TR13?
For technical support, including SMAJ4758CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4758CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4758CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4758CE3/TR13 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMAJ4758CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4758CE3/TR13?
All SMAJ4758CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4758CE3/TR13, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMAJ4758CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4758CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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