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Microchip Technology SMAJ4734AE3/TR13
- Part No.:
- SMAJ4734AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4734AE3/TR13.pdf
- Description:
- DIODE ZENER 5.6V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,258
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Product details
Overview
SMAJ4734AE3/TR13 from SM Semiconductor is a 5.6 V, ±5% tolerance Zener diode 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. It serves as a precision voltage reference and transient overvoltage clamp in low-profile DC power rails and signal line protection circuits.
For engineers reviewing the SMAJ4734AE3/TR13 datasheet, SMAJ4734AE3/TR13 pinout, SMAJ4734AE3/TR13 application, or SMAJ4734AE3/TR13 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (25°C/W), reverse leakage at rated voltage (10 µA @ 2.0 V), knee impedance (600 Ω), and surge current capability under 1/2-sine 1/120 s pulse conditions.
Technical Context
This device operates as a silicon planar Zener diode with sharp breakdown knee and stable regulation across -65°C to +150°C ambient range. Its 5.6 V nominal breakdown voltage is specified at 45 mA test current (IZT), with dynamic impedance of 5.0 Ω measured at that condition.
The SMAJ4734AE3/TR13 exhibits 10 µA maximum reverse leakage at VR = 2.0 V and maintains regulation down to 1.0 mA knee current (IZK), where knee impedance is 600 Ω - confirming suitability for low-current biasing and precision clamping applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 5.6 V ±5% at 45 mA - defines precise clamping threshold for overvoltage protection |
| Power Dissipation (PM(AV)) | 2.0 W - supports continuous regulation in compact PCB layouts with adequate heat sinking |
| Peak Surge Current (Izsm) | 810 mA - withstands 1/2-sine 1/120 s transients induced by inductive switching |
| Dynamic Impedance (ZZT) | 5.0 Ω at IZT - ensures minimal voltage deviation under varying load current |
| Reverse Leakage (IR) | 10 µA max at VR = 2.0 V - guarantees low standby power loss in always-on protection circuits |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables thermal design with discrete lead soldering and minimal copper area |
| Operating Temperature | -65°C to +150°C - validated for automotive under-hood and industrial control environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, void-free thermosetting epoxy case with cathode band marking and matte-tin ROHS-compliant plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-side reference node | Connected to ground or lower-potential rail during reverse-biased clamping operation |
| Cathode | Zener breakdown terminal / high-side clamping node | Connected to protected line; conducts when voltage exceeds 5.6 V, shunting surge to ground |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables tighter clamping accuracy than 10% variants, reducing margin overhead in safety-critical rails |
| 2.0 W steady-state rating | Supports sustained dissipation without derating in standard FR-4 with 25 mm² copper pad |
| Knee current of 1.0 mA | Allows effective regulation even in ultra-low-power sensor bias networks |
| Cathode band polarity indicator | Ensures unambiguous orientation during automated placement and visual inspection |
| UL94V-0 epoxy encapsulation | Meets flammability requirements for enclosed industrial and automotive enclosures |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Clamping |
|---|---|
Use Scenario: Protecting analog input pins of engine control unit (ECU) sensors against load dump and alternator ripple. IC Role / Device Role / Timing Role: Zener clamping diode placed between sensor signal line and ground, conducting above 5.6 V to limit voltage excursion. Use Value: Prevents damage to 5 V ADC inputs while maintaining signal integrity below clamp threshold due to low ZZT (5.0 Ω). | Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers from field-wiring transients. IC Role / Device Role / Timing Role: Reverse-biased transient voltage suppressor on input channel, clamping surges to ≤5.6 V before reaching optocoupler input. Use Value: Withstands 810 mA surge per IEC 61000-4-5 Level 3 without degradation, extending module service life. |
| Consumer Power Adapter Feedback | Telecom Line Interface Protection |
Use Scenario: Providing stable 5.6 V reference for TL431-based feedback loop in AC/DC flyback adapters. IC Role / Device Role / Timing Role: Precision Zener reference source setting secondary-side error amplifier threshold. Use Value: ±5% tolerance and 5.0 Ω dynamic impedance ensure consistent output regulation across line/load variations. | Use Scenario: Shielding RS-485 transceiver data lines from ESD and lightning-induced surges in base station backhaul links. IC Role / Device Role / Timing Role: Low-capacitance (≈30 pF typical) clamping diode placed differential-mode across A/B lines to ground. Use Value: Fast response (<1 ns turn-on) and 25 °C/W RθJL enable reliable protection without signal distortion at 10 Mbps. |
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 |
|---|---|---|---|
| 1N4734A | Same 5.6 V nominal, but DO-41 through-hole package; higher RθJA (500 °C/W vs. 25 °C/W junction-to-lead) | Requires axial-leaded board layout and larger thermal relief; unsuitable for high-density SMT designs | Select SMAJ4734AE3/TR13 for surface-mount reliability and thermal performance in space-constrained systems |
| BZX55C5V6 | 5.6 V ±5%, but 500 mW rating and 600 Ω ZZT - significantly lower surge and regulation capability | Limited to low-energy signal-level clamping; cannot replace in power rail protection roles | Choose SMAJ4734AE3/TR13 where 2.0 W dissipation and 810 mA surge handling are required |
Compared with 1N4734A and BZX55C5V6, the SMAJ4734AE3/TR13 delivers superior thermal management via its SMA package, higher surge robustness, and tighter regulation stability - making it the preferred choice for automotive and industrial SMT applications demanding long-term reliability under repetitive transients.
Availability
SMAJ4734AE3/TR13 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, consumer power adapter feedback networks, and telecom line interface protection requiring stable component supply and traceable sourcing.
Supply support for SMAJ4734AE3/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 semiconductor components including Zener diodes, TVS devices, rectifiers, and bridge rectifiers for industrial and automotive markets.
The SMAJ47xxA series was designed specifically for surface-mount transient voltage suppression and precision DC voltage regulation in high-reliability power and signal conditioning applications.
FAQ
What is the Zener voltage tolerance of SMAJ4734AE3/TR13?
The SMAJ4734AE3/TR13 has a nominal Zener voltage of 5.6 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 5.32 V and 5.88 V at 45 mA test current. This tighter tolerance compared to non-A suffix variants improves accuracy in voltage reference and clamping applications where margin control is critical. The SMAJ4734AE3/TR13 datasheet confirms this specification in Table 1 under "Zener Voltage VZ @ IZT".
Does SMAJ4734AE3/TR13 support high-temperature operation?
Yes, SMAJ4734AE3/TR13 is rated for operation from -65°C to +150°C, with full electrical specifications guaranteed at 25°C and thermal performance validated across this full range. Its 25°C/W junction-to-lead thermal resistance allows stable regulation at 100°C ambient when mounted with adequate copper thermal relief. This makes SMAJ4734AE3/TR13 suitable for under-hood automotive and industrial control environments.
How does the surge current rating of SMAJ4734AE3/TR13 compare to standard Zener diodes?
SMAJ4734AE3/TR13 delivers 810 mA peak surge current under 1/2-sine 1/120 s pulse conditions - more than double the capability of typical 500 mW Zeners like BZX55C5V6. This is enabled by its 2.0 W steady-state rating and optimized SMA package thermal path. Engineers selecting SMAJ4734AE3/TR13 benefit from robust protection against IEC 61000-4-5 Level 3 transients without external heat sinking.
What is the maximum reverse leakage current for SMAJ4734AE3/TR13?
The SMAJ4734AE3/TR13 specifies a maximum reverse leakage current of 10 µA at VR = 2.0 V, measured at 25°C. This low leakage ensures minimal power loss in always-on protection circuits and preserves signal integrity in high-impedance sensor bias networks. The value is confirmed in Table 1 of the official SM Semiconductor datasheet for SMAJ4728A–SMAJ4751A, which explicitly lists IR = 10 µA for SMAJ4734A.
Is SMAJ4734AE3/TR13 RoHS compliant?
Yes, SMAJ4734AE3/TR13 features ROHS-compliant annealed matte-tin plating on terminals, as stated in the "Mechanical Data" section of the official datasheet. The device meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements and is compatible with lead-free reflow profiles. All manufacturing and plating processes for SMAJ4734AE3/TR13 adhere to EU RoHS Directive 2011/65/EU and subsequent amendments.
SMAJ4734AE3/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:
- ±5%
- 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
SMAJ4734AE3/TR13 FAQ
1.How can I place an order for SMAJ4734AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4734AE3/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 SMAJ4734AE3/TR13 reliable?
The price and inventory of SMAJ4734AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4734AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4734AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4734AE3/TR13 transactions.
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4.How is shipping managed for SMAJ4734AE3/TR13?
SMAJ4734AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4734AE3/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 SMAJ4734AE3/TR13?
For technical support, including SMAJ4734AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4734AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4734AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4734AE3/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 SMAJ4734AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4734AE3/TR13?
All SMAJ4734AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4734AE3/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 SMAJ4734AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4734AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4734AE3/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
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
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