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Diodes Incorporated SMAJ43A-13-F
- Part No.:
- SMAJ43A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ43A-13-F.pdf
- Description:
- TVS DIODE 43VWM 69.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:9,883
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Product details
Overview
SMAJ43A-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 43V reverse standoff voltage (VRWM), 47.8–52.8V breakdown voltage (VBR), 69.4V maximum clamping voltage (VC) at 5.7A peak pulse current, and SMA package with cathode band polarity marking.
For engineers reviewing the SMAJ43A-13-F datasheet, SMAJ43A-13-F pinout, SMAJ43A-13-F application, or SMAJ43A-13-F equivalent, key selection criteria include clamping performance under 8.3ms surge, unidirectional polarity assurance, RoHS-compliant lead-free plating, and compatibility with automated SMT assembly on industrial and automotive PCBs.
Technical Context
This TVS diode operates as a fast-acting shunt clamp, activating when transient voltage exceeds its breakdown threshold to divert surge energy away from protected circuitry. Its glass-passivated die ensures stable VBR and low leakage (<5µA at VRWM), while the SMA package supports thermal dissipation up to 1.0W at TL = +75°C.
The device responds within picoseconds to transients and sustains non-repetitive 8.3ms half-sine surges up to 5.7A without degradation. It is rated for operation from –55°C to +150°C junction temperature and meets J-STD-020 moisture sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - Sustains single 8.3ms surge events without failure under defined test conditions. |
| Reverse Standoff Voltage (VRWM) | 43V - Maximum continuous DC or RMS voltage before significant leakage begins; defines operating margin. |
| Breakdown Voltage (VBR) | 47.8–52.8V @ 1.0mA - Confirmed activation threshold range; ensures reliable clamping onset above normal operating voltage. |
| Clamping Voltage (VC) | 69.4V @ 5.7A IPP - Maximum voltage seen by protected circuit during specified surge; determines downstream component stress. |
| Leakage Current (IR) | <5µA @ 43V - Minimal standby power loss and signal integrity impact in high-impedance circuits. |
| Package | SMA - Standard surface-mount outline (4.00–4.60mm length, 2.29–2.92mm width); compatible with IPC-7351B land patterns. |
Pinout & Package
Package: SMA (Surface Mount Axial) - Molded plastic case, UL 94V-0 rated, 0.064g weight, cathode band marking for unidirectional polarity identification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or lower-potential rail; completes shunt path during clamping. |
| Cathode | High-side connection point | Connected to protected line; polarity band identifies this terminal; blocks reverse current in normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Ensures consistent VBR tolerance and long-term stability under thermal cycling and humidity exposure. |
| 400W peak pulse power rating | Provides robust protection against IEC 61000-4-5 Level 4 (4kV/2Ω) surges in industrial power inputs. |
| Lead-free, RoHS-compliant finish | Matte tin plating enables reliable solder wetting per MIL-STD-202, Method 208; supports Pb-free reflow profiles. |
| Fast response time | Sub-nanosecond turn-on limits voltage overshoot during ESD and lightning-induced transients. |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protecting 24V DC sensor inputs and digital outputs in programmable logic controllers against induced surges from relay switching and nearby motor drives. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between signal line and chassis ground to clamp transients before they reach input buffer ICs. Use Value: Limits clamped voltage to 69.4V, well below typical 75V absolute maximum ratings of industrial interface ICs, preventing latch-up or permanent damage. |
Use Scenario: Safeguarding LIN bus lines and low-voltage power rails (e.g., 12V supply to door module microcontrollers) against load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary front-end clamp on battery-fed lines; works in coordination with secondary ceramic capacitors to filter high-frequency noise. Use Value: Withstands 5.7A 8.3ms surges and operates reliably from –40°C to +125°C ambient, meeting AEC-Q101 stress requirements for discrete TVS devices. |
| Telecom Power Feeds | Medical Diagnostic Equipment Interfaces |
Use Scenario: Overvoltage protection on 48V DC power inputs to remote radio units and base station backhaul equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: First-line defense in multi-stage protection scheme; absorbs bulk surge energy before downstream MOVs or polymer PTCs activate. Use Value: 400W rating enables handling of high-energy transients without thermal runaway; SMA footprint allows dense layout near connectors. |
Use Scenario: Protecting analog front-end signal paths (e.g., ECG electrode inputs) from ESD events during patient handling or cable disconnection. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS placed at connector entry point to prevent ESD coupling into precision amplifiers. Use Value: Sub-5µA leakage preserves DC accuracy of µV-level biomedical signals; fast response prevents amplifier saturation during ±8kV contact discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43CA-13-F | Bidirectional version; symmetric clamping in both polarities; same VRWM, VBR, VC, and IPP ratings. | Required where AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN) need protection without polarity constraints. | Select only if bidirectional clamping is required; otherwise unidirectional SMAJ43A-13-F offers tighter leakage control and simpler biasing. |
| SMBJ43A-13-F | Same electrical specs but SMB package (larger footprint, higher PM(AV) = 1.5W, higher IPP = 6.2A). | Better suited for higher-power or thermally constrained designs where board space permits larger package. | Choose when thermal margin is critical or when existing SMB land pattern is standardized; SMAJ43A-13-F preferred for space-constrained layouts. |
Compared with SMAJ43CA-13-F and SMBJ43A-13-F, SMAJ43A-13-F delivers optimal balance of compact size, precise unidirectional clamping, and production-ready SMT compatibility-making it ideal for high-density industrial and automotive PCBs where polarity is fixed and board area is premium.
Availability
SMAJ43A-13-F is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, telecom power feeds, and medical diagnostic equipment interfaces requiring stable component supply across extended product lifecycles.
Supply support for SMAJ43A-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.
SMAJxxA series belongs to Diodes' transient voltage suppressor portfolio, engineered specifically for high-reliability overvoltage protection in harsh environments-including industrial automation, automotive electronics, and infrastructure equipment.
FAQ
What is the maximum clamping voltage of SMAJ43A-13-F and under what test condition?
The maximum clamping voltage (VC) is 69.4V, measured at a peak pulse current (IPP) of 5.7A using a 10/1000µs double-exponential waveform per IEC 61000-4-5. This value represents the worst-case voltage imposed on protected circuitry during a standardized surge event and is guaranteed across the full operating temperature range.
Is SMAJ43A-13-F suitable for automotive applications?
Yes-SMAJ43A-13-F meets AEC-Q101 stress test requirements for discrete semiconductors and is manufactured in IATF 16949-certified facilities. While not qualified to full AEC-Q200 for passive components, its thermal and surge robustness make it widely deployed in non-safety-critical automotive subsystems such as body control modules and infotainment power supplies.
How does the SMA package affect thermal performance compared to SMB or SMC?
The SMA package has a lower steady-state power dissipation rating (PM(AV) = 1.0W at TL = +75°C) versus SMB (1.5W) and SMC (2.0W). Its smaller footprint limits copper pour area for heat spreading, so thermal design must prioritize short, wide traces to internal ground planes and avoid placement near heat sources to maintain junction temperature within –55°C to +150°C limits.
Can SMAJ43A-13-F be used in bidirectional signal lines like RS-485?
No-SMAJ43A-13-F is unidirectional and will conduct continuously if reverse-biased beyond its forward voltage (~3.5V at 35A), potentially damaging the line driver. For RS-485 or other AC-coupled interfaces, use the bidirectional variant SMAJ43CA-13-F, which clamps symmetrically in both directions without forward conduction.
SMAJ43A-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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 5.7A
- 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
SMAJ43A-13-F FAQ
1.How can I place an order for SMAJ43A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ43A-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 SMAJ43A-13-F reliable?
The price and inventory of SMAJ43A-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 SMAJ43A-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ43A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ43A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ43A-13-F?
SMAJ43A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ43A-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 SMAJ43A-13-F?
For technical support, including SMAJ43A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ43A-13-F requirements.
6.How does Aetrix verify that SMAJ43A-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ43A-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 SMAJ43A-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ43A-13-F?
All SMAJ43A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ43A-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 SMAJ43A-13-F part is unused and in its original packaging.
Return procedure for SMAJ43A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ43A-13-F Tags
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Diodes Incorporated
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