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Diodes Incorporated SMAJ45A-13-F
- Part No.:
- SMAJ45A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45A-13-F.pdf
- Description:
- TVS DIODE 45VWM 72.7VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:8,955
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Product details
Overview
SMAJ45A-13-F from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power lines and signal interfaces. It features a 45V reverse standoff voltage (VRWM), 50.0–55.3V breakdown voltage (VBR), 72.7V maximum clamping voltage (VC) at 5.5A peak pulse current, and SMA package with cathode band polarity indicator.
For engineers reviewing the SMAJ45A-13-F datasheet, SMAJ45A-13-F pinout, SMAJ45A-13-F application, or SMAJ45A-13-F equivalent, key selection criteria include clamping performance under 8.3ms surge, unidirectional polarity for DC rail protection, RoHS-compliant lead-free plating, and compatibility with automated SMT assembly on PCBs requiring IEC 61000-4-2/4-4/4-5 level compliance.
Technical Context
This TVS diode operates as a fast-acting shunt protector that clamps transient voltages above its breakdown threshold while maintaining low leakage (<5µA at VRWM) and low forward voltage drop (VF = 3.5V at 35A). Its glass-passivated junction ensures stable VBR tolerance and robust surge handling across -55°C to +150°C operating range.
The device responds within picoseconds to transients and sustains 400W non-repetitive peak pulse power per the 10/1000µs waveform standard. Its SMA package supports thermal dissipation up to 1.0W at TL = +75°C and meets J-STD-020 moisture sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - Supports IEC 61000-4-5 4kV surge immunity without degradation |
| Reverse Standoff Voltage | 45V - Sets maximum continuous DC operating voltage before clamping initiates |
| Breakdown Voltage | 50.0–55.3V @ 1mA - Defines precise clamping onset window for predictable protection margin |
| Clamping Voltage | 72.7V @ 5.5A - Limits downstream circuit stress during worst-case 8.3ms half-sine surge |
| Leakage Current | <5µA @ 45V - Minimizes standby power loss in battery-powered or high-impedance circuits |
| Package | SMA - Standardized surface-mount footprint compatible with IPC-7351B land pattern |
Pinout & Package
The SMAJ45A-13-F uses a 2-terminal SMA (DO-214AC) package with cathode band marking on the top surface indicating the cathode terminal. The device has no internal leads or substrate connections beyond the two external metallized terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path | Connected to ground or low-impedance reference plane to complete clamping loop |
| Cathode | Protected line input | Connected to the line being protected (e.g., 45V supply rail); marked by visible band |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Enables single-device protection against severe lightning-induced surges per IEC 61000-4-5 Level 4 |
| Glass Passivated Junction | Ensures stable VBR over temperature and lifetime, reducing parameter drift in automotive/industrial environments |
| Lead-Free & RoHS Compliant | Meets global environmental regulations and supports Pb-free reflow soldering profiles (JEDEC J-STD-020) |
| Fast Response Time | Sub-nanosecond clamping action prevents ESD or EFT transients from propagating into sensitive IC inputs |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24V/48V digital input channels in programmable logic controllers from induced surges on long field wiring. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between input terminal and chassis ground to clamp transients before reaching optocoupler or MCU GPIO. Use Value: Clamps 4kV surges to ≤72.7V, preserving signal integrity and preventing latch-up in downstream isolation components. | Use Scenario: Safeguarding LIN bus or sensor supply lines in body control modules exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12V auxiliary rails feeding door module microcontrollers and Hall-effect sensors. Use Value: Withstands 40A surge current (IFSM) and maintains <5µA leakage at 45V, minimizing battery drain in always-on domains. |
| Telecom Power Feeds | Medical Diagnostic Equipment |
Use Scenario: Protecting PoE-powered Ethernet ports and auxiliary DC feeds in network switches and base stations. IC Role / Device Role / Timing Role: Secondary-level TVS on 48V DC input stage upstream of DC-DC converters to absorb residual transients after primary MOV suppression. Use Value: 72.7V clamping ensures converter ICs (e.g., TPS54302) remain within absolute maximum ratings during combined surge events. | Use Scenario: Shielding analog front-end power rails in portable ultrasound or patient monitor systems from ESD and defibrillator-induced transients. IC Role / Device Role / Timing Role: Low-leakage unidirectional TVS on regulated ±15V and +5V supplies feeding precision ADCs and op-amps. Use Value: Sub-5µA IR at VRWM avoids offset errors in µV-level signal chains while delivering 400W surge absorption capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45A-E3/5A (Vishay) | Identical VRWM (45V), VC = 72.7V, but rated for 1.5kW peak pulse power (10/1000µs) | Higher surge rating suits harsher industrial environments with repeated exposure to high-energy transients | Select when system-level testing requires >400W margin or when used alongside lower-clamping secondary protectors |
| P6SMB45A (ON Semiconductor) | Same SMA package and VRWM, but PM(AV) = 1.0W and VC = 73.0V - functionally identical clamping behavior | Qualified to AEC-Q101; preferred for automotive production where PPAP documentation is mandatory | Choose for automotive OEM programs requiring full change control and IATF 16949 traceability |
Compared with SMAJ45A-13-F, SMAJ45A-E3/5A offers higher surge headroom without footprint change, while P6SMB45A provides automotive qualification at nearly identical electrical performance-enabling design reuse across industrial and automotive platforms with minimal validation overhead.
Availability
SMAJ45A-13-F is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and telecom power feed applications requiring stable component supply, consistent parametric performance, and full RoHS compliance.
Supply support for SMAJ45A-13-F 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for cost-effective, high-reliability overvoltage protection in space-constrained surface-mount applications across industrial, automotive, and communications markets.
FAQ
What is the maximum clamping voltage of SMAJ45A-13-F and under what test condition?
The maximum clamping voltage is 72.7V, measured at a peak pulse current (IPP) of 5.5A using the standardized 10/1000µs double-exponential waveform. This value is guaranteed across the full operating temperature range (-55°C to +150°C) and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SMAJ45A-13-F suitable for bidirectional signal line protection?
No - SMAJ45A-13-F is a unidirectional TVS diode, indicated by the absence of the "C" suffix. It conducts only during positive transients on the cathode relative to anode and must be oriented with cathode toward the protected line. For bidirectional protection (e.g., RS-485), use SMAJ45CA-13-F instead.
Does this part meet automotive qualification standards?
The standard SMAJ45A-13-F is not AEC-Q101 qualified. Diodes offers an automotive-grade variant, SMAJ45AQ-13-F, documented separately and manufactured in IATF 16949-certified facilities with PPAP support. That version is required for production automotive applications.
What is the thermal derating behavior above +25°C ambient?
Peak pulse power derates linearly from 100% at +25°C to approximately 50% at +100°C, per Figure 1 in DS19005 Rev. 19-2. Steady-state power dissipation is limited to 1.0W at TL = +75°C, with linear derating to zero at +150°C case temperature, as shown in Figure 6.
SMAJ45A-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 5.5A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAJ45A-13-F FAQ
1.How can I place an order for SMAJ45A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45A-13-F 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 SMAJ45A-13-F reliable?
The price and inventory of SMAJ45A-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ45A-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ45A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45A-13-F?
SMAJ45A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45A-13-F 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 SMAJ45A-13-F?
For technical support, including SMAJ45A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45A-13-F requirements.
6.How does Aetrix verify that SMAJ45A-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ45A-13-F 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 SMAJ45A-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ45A-13-F?
All SMAJ45A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45A-13-F, 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 SMAJ45A-13-F part is unused and in its original packaging.
Return procedure for SMAJ45A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ45A-13-F Tags
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ESD9B5.0ST5G
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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