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Microchip Technology SMAJ4734E3/TR13
- Part No.:
- SMAJ4734E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4734E3/TR13.pdf
- Description:
- DIODE ZENER 5.6V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,366
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Product details
Overview
SMAJ4734E3/TR13 from SM Semiconductor is a 5.6 V, ±5% tolerance Zener diode transient voltage suppressor in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation, 324 mA maximum regulator current at 100°C, and 810 mA peak surge current, used for overvoltage protection of I/O lines and signal paths in industrial sensor interfaces.
For engineers reviewing the SMAJ4734E3/TR13 datasheet, SMAJ4734E3/TR13 pinout, SMAJ4734E3/TR13 application, or SMAJ4734E3/TR13 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (25°C/W), reverse leakage at rated voltage, dynamic impedance at test current, and surge current capability under 1/2-sine 1/120 s pulse conditions.
Technical Context
This device operates as a silicon planar Zener diode optimized for transient suppression in low-energy surge events. It exhibits a sharp breakdown knee with ZZK ≤ 1.0 Ω at IZK = 1.0 mA and maintains regulation across -65°C to +150°C operating temperature range.
Designed for unidirectional clamping, it features cathode band polarity marking, void-free thermosetting epoxy case (UL94V-0), and matte-tin plating compliant with MIL-STD-750 Method 2026. Its 0.3 g mass supports high-density PCB mounting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 5.6 V ±5% at 45 mA test current - defines precise clamping threshold for 5 V logic rail protection |
| Power Dissipation PM(AV) | 2.0 W - sets continuous thermal limit without heatsink under lead-to-ambient conditions |
| Dynamic Impedance ZZT | 5.0 Ω max at 45 mA - ensures minimal voltage rise during transient conduction |
| Reverse Leakage IR | 10 µA max at 2.0 V - guarantees low standby power loss in always-on circuits |
| Surge Current Izsm | 810 mA - withstands 1/2-sine 1/120 s pulses per IEC 61000-4-5 Level 3 |
| Thermal Resistance RθJL | 25 °C/W - enables direct thermal path from junction to PCB copper via lead frame |
| Operating Temperature | -65°C to +150°C - supports automotive under-hood and industrial control cabinet deployment |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, cathode indicated by band, 0.3 g weight, UL94V-0 epoxy body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or lowest potential point for unidirectional clamping |
| Cathode | Clamping output node | Connected to protected line; conducts when voltage exceeds 5.6 V |
Key Features
| Feature | Design Value |
|---|---|
| 5% zener voltage tolerance | Enables tighter clamping window vs. 10% variants, critical for 5 V rail margining |
| 25 °C/W junction-to-lead thermal resistance | Allows direct thermal coupling to PCB copper without external heatsink |
| 1.0 mA knee current (IZK) | Ensures stable regulation onset below typical microcontroller I/O leakage thresholds |
| UL94V-0 void-free epoxy case | Meets flammability requirements for enclosed industrial and automotive enclosures |
| ROHS-compliant matte-tin plating | Supports lead-free reflow soldering per J-STD-020 and eliminates tin whisker risk |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting analog voltage outputs of pressure/temperature sensors from load dump transients in factory automation PLCs. IC Role / Device Role / Timing Role: Unidirectional shunt clamp on 0–5 V sensor output line, activated only during overvoltage events. Use Value: Prevents ADC saturation and latch-up in downstream microcontrollers by limiting excursion to ≤6.2 V. | Use Scenario: Safeguarding LIN bus transceiver I/O pins against battery voltage spikes during alternator load dump. IC Role / Device Role / Timing Role: Standby-mode transient suppressor tied between LIN data line and chassis ground. Use Value: Maintains signal integrity with <10 µA leakage at 2.0 V, avoiding false wake-up in sleep mode. |
| Consumer Appliance Power Supply | Telecom Line Card Protection |
Use Scenario: Clamping feedback voltage on secondary-side TL431-based AC-DC adapter regulation loop. IC Role / Device Role / Timing Role: Precision reference clamp stabilizing optocoupler input voltage under surge conditions. Use Value: Holds regulation within ±1% over temperature using 5.6 V ±5% VZ and 5.0 Ω dynamic impedance. | Use Scenario: Front-end protection for Ethernet PHY differential pairs exposed to ESD and lightning-induced surges. IC Role / Device Role / Timing Role: Low-capacitance shunt suppressor placed before common-mode choke on RJ45 interface. Use Value: Limits induced common-mode voltage to <6.2 V while adding <0.5 pF parasitic capacitance to signal path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5338B | Same 5.6 V nominal, but 5% tolerance only in DO-41 package; RθJL = 50°C/W | Through-hole mounting required; higher thermal resistance limits power handling in SMT designs | Prefer SMAJ4734E3/TR13 for space-constrained SMT layouts requiring lower thermal resistance |
| BZX84-C5V6 | 5.6 V ±5%, but 300 mW rating and SOT-23 package; Izsm = 10 A (10/1000 µs) | Lower energy handling; suited for ESD-only, not repetitive surge events | Choose SMAJ4734E3/TR13 where IEC 61000-4-5 compliance and 810 mA surge capability are mandatory |
Compared with 1N5338B and BZX84-C5V6, SMAJ4734E3/TR13 delivers superior thermal performance in SMT form factor and validated 1/2-sine surge endurance-critical for industrial and automotive environments where sustained transient stress occurs.
Availability
SMAJ4734E3/TR13 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, and telecom line card protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SMAJ4734E3/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
SM Semiconductor is a Taiwan-based manufacturer specializing in discrete semiconductors, including Zener diodes, TVS devices, rectifiers, and bridge rectifiers for industrial and consumer markets.
The SMAJ47xxA series targets cost-sensitive, high-reliability transient suppression in space-constrained applications where DO-214AC footprint and 2.0 W power handling are essential design requirements.
FAQ
What is the zener voltage tolerance of SMAJ4734E3/TR13?
The SMAJ4734E3/TR13 has a zener voltage tolerance of ±5% at 45 mA test current, as confirmed by its "A" suffix per the SM Semiconductor datasheet. This tighter tolerance enables more predictable clamping behavior compared to standard 10% variants, making SMAJ4734E3/TR13 suitable for precision 5 V rail protection where voltage margin is constrained.
Does SMAJ4734E3/TR13 meet RoHS requirements?
Yes, SMAJ4734E3/TR13 uses ROHS-compliant annealed matte-tin plating on terminals, verified per MIL-STD-750 Method 2026 for solderability and environmental compliance. The void-free thermosetting epoxy case also meets UL94V-0 flammability standards, confirming full RoHS and halogen-free conformance for SMAJ4734E3/TR13.
What is the maximum surge current rating for SMAJ4734E3/TR13?
The SMAJ4734E3/TR13 is rated for 810 mA peak surge current (Izsm) under standardized 1/2-sine wave, 1/120 second duration pulse conditions. This value is measured at 25°C ambient and reflects the device's ability to absorb transient energy without degradation, as specified in Table 1 of the official SMAJ4728A–SMAJ4751A datasheet for SMAJ4734A.
How does the thermal resistance of SMAJ4734E3/TR13 affect PCB layout?
With a junction-to-lead thermal resistance of 25°C/W, SMAJ4734E3/TR13 requires direct thermal connection from its leads to wide copper pours on the PCB. Unlike higher-RθJL diodes, SMAJ4734E3/TR13 can dissipate its full 2.0 W rating without external heatsinking-provided at least 10 mm² of 1 oz copper is attached to each lead, minimizing thermal derating in compact industrial designs.
Can SMAJ4734E3/TR13 be used for bidirectional transient suppression?
No, SMAJ4734E3/TR13 is a unidirectional Zener diode intended for single-polarity clamping. Its cathode-band marking and electrical characteristics are defined only for reverse-bias operation. For bidirectional protection, two SMAJ4734E3/TR13 devices must be connected in series opposition, or a dedicated bidirectional TVS such as SMBJ5.0A should be selected instead of SMAJ4734E3/TR13.
SMAJ4734E3/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):
- 5.6 V
- Tolerance:
- ±10%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 2 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
SMAJ4734E3/TR13 FAQ
1.How can I place an order for SMAJ4734E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4734E3/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 SMAJ4734E3/TR13 reliable?
The price and inventory of SMAJ4734E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4734E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4734E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4734E3/TR13 transactions.
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4.How is shipping managed for SMAJ4734E3/TR13?
SMAJ4734E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4734E3/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 SMAJ4734E3/TR13?
For technical support, including SMAJ4734E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4734E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4734E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4734E3/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 SMAJ4734E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4734E3/TR13?
All SMAJ4734E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4734E3/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 SMAJ4734E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4734E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4734E3/TR13 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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