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Diodes Incorporated SMAJ45A-13
- Part No.:
- SMAJ45A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ45A-13.pdf
- Description:
- TVS DIODE 45VWM 72.7VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:4,376
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Product details
Overview
SMAJ45A-13 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 45V reverse standoff voltage (VRWM), 50.0–55.3V breakdown voltage (VBR) at 1mA, 72.7V maximum clamping voltage (VC) at 5.5A peak pulse current (IPP), and operates from –55°C to +150°C - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMAJ45A-13 datasheet, SMAJ45A-13 pinout, SMAJ45A-13 application, or SMAJ45A-13 equivalent, key selection criteria include clamping performance under 8.3ms surge, unidirectional polarity handling, SMA package thermal limits, and compliance with IEC 61000-4-2/4-4/4-5 system-level ESD/EFT/surge immunity requirements.
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for fast response (<1 ps) to transient overvoltages. Its unidirectional configuration enables integration into polarized DC circuits where reverse conduction must be blocked during normal operation.
The device sustains 400W non-repetitive peak pulse power (PPK) with derating above 25°C ambient, supports 40A forward surge current (IFSM) at 8.3ms half-sine, and maintains <5.0µA reverse leakage (IR) at VRWM - critical for low-power standby circuit integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - withstands single high-energy transients per JEDEC test conditions without failure |
| Reverse Standoff Voltage | 45V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage | 50.0–55.3V @ 1mA - precise VBR window ensures reliable turn-on margin above VRWM |
| Clamping Voltage | 72.7V @ 5.5A IPP - limits downstream voltage stress during 8.3ms surge events |
| Operating Temperature | –55°C to +150°C - qualified for under-hood automotive and industrial environments |
| Package | SMA (DO-214AC) - surface-mount footprint compatible with automated PCB assembly |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode band marking for polarity identification. Dimensions: 4.00–4.60mm length × 2.29–2.92mm width × 1.27–1.63mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during clamping | Connected to protected line; conducts surge current toward ground when V > VBR |
| Cathode | Current exit during clamping | Marked with band; tied to system ground or lower-potential rail for unidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enhances long-term reliability and moisture resistance vs. epoxy-passivated alternatives |
| Fast response time | Sub-nanosecond turn-on ensures clamping before sensitive ICs experience overvoltage damage |
| RoHS-compliant finish | Matte tin plating meets EU Directive Annex exemptions for high-temp soldering |
| Steady-state power rating | 1.0W @ TL = 75°C - supports thermal design in compact layouts with limited copper area |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 48V DC input rail in programmable logic controller (PLC) power stage exposed to load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converter input to limit transient voltage to ≤72.7V. Use Value: Prevents MOSFET gate oxide rupture and regulator latch-up by clamping 400W surges within 1ps response window. | Use Scenario: LIN bus transceiver power line in door module subjected to ISO 7637-2 Pulse 5a (load dump). IC Role / Device Role / Timing Role: Unidirectional TVS connected between VBAT and GND to absorb 100V/100ms transients. Use Value: Maintains <5µA leakage at 45V VRWM to avoid battery drain while clamping to 72.7V at 5.5A. |
| Telecom DC Feeder Protection | Smart Meter Power Input Stage |
Use Scenario: 24V DC power feed to remote base station radio unit experiencing lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-line transient suppressor on main DC input before fuse and filtering stage. Use Value: Withstands 40A 8.3ms surge (IFSM) without degradation, enabling robust field deployment. | Use Scenario: M-Bus interface power input in utility meter exposed to EFT bursts per IEC 61000-4-4. IC Role / Device Role / Timing Role: Clamping device across VCC-GND to protect metrology IC and RTC during fast transients. Use Value: 72.7V VC ensures downstream 3.3V LDO input remains below absolute maximum rating during 5.5A transient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CA-13 | Bi-directional version; symmetric clamping for AC or floating lines | Required where bidirectional surges occur (e.g., RS-485 data lines) | Select only if circuit lacks defined polarity or handles AC-coupled signals |
| SMBJ45A-13 | Same electrical specs but SMB package (higher PPK = 600W, larger footprint) | Used where higher surge margin or thermal mass is needed | Choose when board layout allows larger package and 600W rating is required |
Compared with SMAJ45CA-13, this unidirectional part avoids unnecessary capacitance in DC rails; compared with SMBJ45A-13, it saves PCB area while maintaining full 400W capability in space-constrained designs.
Availability
SMAJ45A-13 is available at Aetrix Electronics and suitable for industrial power supply protection, automotive body control modules, telecom DC feeder protection, and smart meter power input stages requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMAJ45A-13 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 and manufacturing operations across Asia and the Americas.
The SMAJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability, surface-mount overvoltage protection in automotive, industrial, and communications infrastructure applications.
FAQ
What is the polarity configuration of SMAJ45A-13?
SMAJ45A-13 is a unidirectional TVS diode, indicated by the absence of the "C" suffix. It conducts only when anode voltage exceeds cathode voltage by ≥50V, blocking reverse current during normal operation. The cathode is marked with a band on the SMA package body.
How does SMAJ45A-13 perform under repeated surge stress?
SMAJ45A-13 is rated for non-repetitive pulses only - maximum 4 pulses per minute at 25°C ambient. Repeated surges require thermal derating per Figure 1 in DS19005, and cumulative energy must stay below 400W·ms to prevent junction overheating and parametric shift.
Is SMAJ45A-13 compatible with lead-free reflow processes?
Yes - SMAJ45A-13 uses matte tin plating and is qualified for standard Pb-free reflow profiles (JEDEC J-STD-020C Level 1). Its maximum lead temperature rating is 260°C for 10 seconds, and it meets RoHS Directive 2011/65/EU with applicable exemptions.
What is the typical junction capacitance of SMAJ45A-13 at 0V bias?
Per Figure 2 in DS19005, the typical junction capacitance is ~120pF at 0V bias and 25°C. This value decreases with increasing reverse bias and is relevant for high-speed signal line protection where capacitive loading affects signal integrity.
SMAJ45A-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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 FAQ
1.How can I place an order for SMAJ45A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ45A-13 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 reliable?
The price and inventory of SMAJ45A-13 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 is usually 5 days.
3.What payment methods are accepted for SMAJ45A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ45A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ45A-13?
SMAJ45A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ45A-13 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?
For technical support, including SMAJ45A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ45A-13 requirements.
6.How does Aetrix verify that SMAJ45A-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ45A-13 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 meets industry standards.
7.What is the process for return or replacement of SMAJ45A-13?
All SMAJ45A-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ45A-13, 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 part is unused and in its original packaging.
Return procedure for SMAJ45A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ45A-13 Tags
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