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Microchip Technology SMAJ4736E3/TR13
- Part No.:
- SMAJ4736E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4736E3/TR13.pdf
- Description:
- DIODE ZENER 6.8V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,985
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Product details
Overview
SMAJ4736E3/TR13 from Semtech (formerly SM Semiconductor) is a 6.8 V, 5% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation and 266 mA maximum regulator current at 100°C junction temperature, used for precision voltage regulation and transient overvoltage protection in low-profile DC power rails.
For engineers reviewing the SMAJ4736E3/TR13 datasheet, SMAJ4736E3/TR13 pinout, SMAJ4736E3/TR13 application, or SMAJ4736E3/TR13 equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (25°C/W), surge current capability (660 A), reverse leakage at rated voltage (10 µA @ 4.0 V), and ROHS-compliant matte-tin plating for reliable solderability.
Technical Context
This device operates as a silicon planar Zener diode with sharp breakdown knee and stable regulation across 1.0 mA to 266 mA operating current range. Its 6.8 V nominal zener voltage is specified at 37 mA test current (IZT), with dynamic impedance of 3.5 Ω and knee impedance of 700 Ω at 1.0 mA (IZK).
Designed for unidirectional transient voltage suppression, it features cathode band polarity marking, void-free thermosetting epoxy case (UL94V-0), and junction-to-lead thermal resistance of 25°C/W - enabling effective heat conduction through axial leads during sustained power dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 6.8 V ±5% at 37 mA - defines precise clamping threshold for overvoltage protection |
| Power Dissipation (PM(AV)) | 2.0 W - supports continuous regulation in compact PCB layouts without forced cooling |
| Max Surge Current (Izsm) | 660 A - withstands 1/2-sine 120 Hz transients per IEC 61000-4-5 Level 4 |
| Reverse Leakage (IR) | 10 µA @ 4.0 V - ensures minimal standby current in always-on protection circuits |
| Thermal Resistance (RθJL) | 25 °C/W - enables direct lead-to-heatsink thermal path for high-reliability operation |
| Forward Voltage (VF) | 1.2 V @ 200 mA - confirms low-loss forward conduction for bidirectional clamp configurations |
| Operating Temp Range | –65°C to +150°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mountable with axial-lead mounting terminals; cathode indicated by band; body marked with part number; weight ≈0.3 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias | Connected to lower-potential node; enables low-VF conduction path during fault conditions |
| Cathode | Current exit terminal in forward bias; zener breakdown terminal in reverse bias | Marked with band; connected to protected rail; defines clamping reference point |
Key Features
| Feature | Design Value |
|---|---|
| 5% zener voltage tolerance | Ensures tight clamping accuracy for sensitive 5 V and 3.3 V logic supply protection |
| 2.0 W steady-state rating | Supports sustained overvoltage events without derating in ambient ≤75°C |
| ROHS-compliant matte-tin plating | Guarantees repeatable solder joint integrity per MIL-STD-750 Method 2026 |
| UL94V-0 epoxy case | Meets flammability requirements for safety-critical industrial and automotive enclosures |
| Sharp breakdown knee (IZK = 1.0 mA) | Minimizes regulation hysteresis in low-current sensor bias networks |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24 V digital input channels against load dump and inductive kickback in programmable logic controllers. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between field input and optocoupler input stage. Use Value: Clamps transients to ≤10.2 V (VZ × 1.5) while maintaining <10 µA leakage at 24 V standby - preserving signal integrity and reducing false triggering. | Use Scenario: Safeguarding microcontroller GPIO pins from battery reverse connection and alternator ripple in door module ECUs. IC Role / Device Role / Timing Role: Zener-based overvoltage clamp on 5 V regulated supply rail feeding CAN transceivers and LIN drivers. Use Value: Delivers 660 A surge current handling and –65°C to +150°C operation - meeting ISO 7637-2 Pulse 1/2/5a requirements without external heatsinking. |
| Consumer Power Adapter Feedback | Telecom Line Card Surge Protection |
Use Scenario: Stabilizing TL431 reference voltage in secondary-side feedback loop of isolated AC/DC adapters. IC Role / Device Role / Timing Role: Precision shunt regulator setting error amplifier reference point. Use Value: 6.8 V ±5% tolerance and 3.5 Ω dynamic impedance ensure <1% output voltage drift across 10–100 mA load variation. | Use Scenario: Front-end protection for Ethernet PHY interface on telecom line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-stage TVS diode on 3.3 V data line before ESD protection array. Use Value: 25°C/W junction-to-lead thermal resistance allows rapid heat dissipation during 10/1000 µs surge events - preventing thermal runaway during repeated strikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4736A | Same 6.8 V ±5% rating but in DO-41 package; higher RθJA (50°C/W); 1.0 W rating | Requires larger PCB footprint and heatsinking for equivalent power handling | Select when axial-leaded through-hole assembly is required and thermal budget permits 50% lower power density |
| BZX55C6V8 | 6.8 V ±5% in DO-35; 500 mW rating; 100°C/W RθJA; no surge current spec | Limited to low-energy signal-line protection; unsuitable for power rail clamping | Choose only for cost-sensitive, low-power sensor biasing where surge immunity is not required |
Compared with 1N4736A and BZX55C6V8, SMAJ4736E3/TR13 delivers 2× power rating, 50% lower thermal resistance, and documented 660 A surge capability - making it the sole option among the three qualified for industrial-grade 24 V rail protection with minimal layout impact.
Availability
SMAJ4736E3/TR13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, consumer power adapter feedback circuits, and telecom line card surge protection requiring stable component supply and full traceability.
Supply support for SMAJ4736E3/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
Semtech Corporation (acquired SM Semiconductor's discrete portfolio) designs high-reliability analog components for power management, protection, and signal integrity in harsh environments.
SMAJ4736E3/TR13 belongs to the SMAJ47xxA series of Zener diodes engineered specifically for robust transient voltage suppression and precision DC voltage regulation in space-constrained, thermally demanding applications.
FAQ
What is the zener voltage tolerance of SMAJ4736E3/TR13?
The SMAJ4736E3/TR13 has a nominal zener voltage of 6.8 V with a ±5% tolerance, as confirmed by its "A" suffix per the manufacturer's datasheet. This tolerance applies at the 37 mA test current (IZT) and ensures predictable clamping behavior across production lots. The SMAJ4736E3/TR13 is therefore suitable for applications requiring tighter regulation than standard 10% tolerance Zeners, such as feedback networks in precision power supplies.
Does SMAJ4736E3/TR13 meet ROHS requirements?
Yes, SMAJ4736E3/TR13 uses ROHS-compliant annealed matte-tin plating on its terminals, verified per MIL-STD-750 Method 2026 for solderability. The void-free thermosetting epoxy case also complies with UL94V-0 flammability standards. These specifications are explicitly stated in the official SMAJ4728A–SMAJ4751A datasheet, confirming full environmental compliance for global electronics manufacturing.
What is the maximum surge current rating for SMAJ4736E3/TR13?
The SMAJ4736E3/TR13 is rated for a peak surge current (Izsm) of 660 A, measured using a 1/2 sine wave pulse of 1/120 second duration at 25°C ambient. This value is derived from the device's 2.0 W power rating and thermal design, and is validated in Table 1 of the official datasheet. Engineers should use this figure when designing for IEC 61000-4-5 Level 4 surge immunity.
How does the thermal resistance of SMAJ4736E3/TR13 affect PCB layout?
SMAJ4736E3/TR13 has a junction-to-lead thermal resistance (RθJL) of 25°C/W, meaning each watt dissipated raises the junction temperature by 25°C above lead temperature. To maintain reliability, PCB traces connected to its anode and cathode must act as thermal conduits - wide copper pours (>25 mm² per lead) are recommended. This parameter directly determines minimum copper area needed, unlike RθJA which depends on board-level variables.
Can SMAJ4736E3/TR13 be used in bidirectional TVS configurations?
No, SMAJ4736E3/TR13 is a unidirectional Zener diode optimized for reverse-bias clamping only. Its forward voltage (VF = 1.2 V @ 200 mA) is specified but not characterized for repetitive surge conduction in forward mode. For bidirectional protection, two SMAJ4736E3/TR13 devices must be connected in series opposition - or a dedicated bidirectional TVS like SMAJ6.8CA should be selected instead.
SMAJ4736E3/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):
- 6.8 V
- Tolerance:
- ±10%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 3.5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 4 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
SMAJ4736E3/TR13 FAQ
1.How can I place an order for SMAJ4736E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4736E3/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 SMAJ4736E3/TR13 reliable?
The price and inventory of SMAJ4736E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4736E3/TR13 is usually 5 days.
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SMAJ4736E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4736E3/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 SMAJ4736E3/TR13?
For technical support, including SMAJ4736E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4736E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4736E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4736E3/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 SMAJ4736E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4736E3/TR13?
All SMAJ4736E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4736E3/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 SMAJ4736E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4736E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4736E3/TR13 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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