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Diodes Incorporated SMAJ48A-13
- Part No.:
- SMAJ48A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48A-13.pdf
- Description:
- TVS DIODE 48VWM 77.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:8,531
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Product details
Overview
SMAJ48A-13 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 48V reverse standoff voltage (VRWM), 53.3–58.9V breakdown range (VBR @ 1mA), 77.4V max clamping voltage at 5.2A 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 SMAJ48A-13 datasheet, SMAJ48A-13 pinout, SMAJ48A-13 application, or SMAJ48A-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD tolerance, peak pulse current handling under ISO 7637-2 Pulse 1/2a, unidirectional polarity alignment with DC rail topology, and SMA package thermal performance under sustained surge duty.
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for fast response (<1 ps) to ESD and lightning-induced transients. Its unidirectional configuration provides low-leakage forward blocking while enabling robust clamping during negative-going surges on grounded-return systems.
Rated for 400W non-repetitive peak pulse power (8.3ms half-sine), it derates linearly above 25°C ambient and supports steady-state dissipation of 1.0W at 75°C lead temperature. Clamping occurs at ≤77.4V when subjected to 5.2A IPP, ensuring safe operation below typical 60V-rated downstream components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - sustains single 8.3ms transients per JEDEC without failure |
| Reverse Standoff Voltage | 48 V - maximum continuous DC operating voltage before leakage exceeds 5 µA |
| Breakdown Voltage | 53.3–58.9 V @ 1 mA - ensures reliable triggering above system nominal voltage |
| Clamping Voltage | 77.4 V @ 5.2 A - limits voltage seen by protected ICs during surge events |
| Peak Pulse Current | 5.2 A - maximum surge current handled at rated clamping voltage |
| Operating Temperature | –55°C to +150°C - supports under-hood automotive and industrial ambient conditions |
| Package | SMA (DO-214AC) - surface-mount footprint compatible with automated assembly and 1.0W thermal dissipation at TL = 75°C |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode band marking for polarity identification, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to system ground in unidirectional configuration | Provides low-impedance path to ground during negative transients on the protected line |
| Cathode | Current exit point in forward bias; connected to protected line (e.g., 48V rail) | Blocks normal forward current but avalanches into conduction when reverse voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enables stable VBR and low leakage across temperature and lifetime, critical for long-term reliability in sealed enclosures |
| 400W peak pulse rating | Meets IEC 61000-4-5 Level 4 (4kV) surge immunity requirements for industrial equipment ports |
| Fast response time | <1 ps junction response ensures clamping initiates before sensitive ICs experience overstress |
| RoHS-compliant matte tin plating | Supports lead-free reflow profiles (J-STD-020C) without solder joint degradation or whisker risk |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24V/48V DC input terminals exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Primary clamping device placed upstream of DC-DC converter input. Use Value: Limits transient voltage to ≤77.4V, preventing damage to 80V-rated input MOSFETs and maintaining system uptime. |
Use Scenario: LIN bus or sensor supply lines subject to ISO 7637-2 Pulse 1 (–100V/2Ω) and Pulse 2a (+100V/50Ω). IC Role / Device Role / Timing Role: Unidirectional TVS tied between supply rail and chassis ground. Use Value: Clamps negative transients within 1 ps while adding <10 pF capacitance - no signal integrity impact on 20 kbps LIN timing. |
| Telecom Power Feeds | Renewable Energy Charge Controllers |
Use Scenario: -48V DC telecom power distribution boards encountering lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-stage protection before bulk capacitors and hot-swap controllers. Use Value: Absorbs 400W pulses without thermal runaway, verified per Telcordia GR-1089-CORE Zone 3 requirements. |
Use Scenario: PV array input stage of MPPT charge controller exposed to rapid voltage reversals and grid-switching transients. IC Role / Device Role / Timing Role: Reverse-polarity and surge protection on battery-side DC link. Use Value: Withstands repeated 5.2A surges at 77.4V clamp, preserving MOSFET gate oxide integrity during field deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48CA-13 | Bi-directional version; symmetric clamping for AC-coupled or floating rails | Required where bidirectional transients (e.g., RS-485 data lines) or undefined polarity exist | Select only if system lacks defined ground reference or handles bipolar signals |
| SMBJ48A-13 | Same VRWM/VBR/VC specs but in larger SMB (DO-214AA) package; 600W PPK rating | Better thermal mass for higher average surge duty cycles or elevated ambient temperatures | Prefer when board layout allows SMB footprint and >400W single-pulse headroom is needed |
Compared with SMAJ48CA-13, the SMAJ48A-13 offers lower capacitance and tighter leakage for DC rail use; versus SMBJ48A-13, it trades 200W pulse headroom for 30% smaller PCB area and faster assembly throughput.
Availability
SMAJ48A-13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, telecom power feeds, and renewable energy charge controllers requiring stable component supply across extended product lifecycles.
Supply support for SMAJ48A-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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and protection.
The SMAJ series targets high-reliability transient suppression in space-constrained, thermally demanding environments - engineered specifically for automotive, industrial, and telecom infrastructure applications requiring AEC-Q200 alignment and long-term parametric stability.
FAQ
What is the maximum clamping voltage of SMAJ48A-13 at its rated peak pulse current?
The maximum clamping voltage (VC) is 77.4 V at 5.2 A peak pulse current (IPP), measured under 8.3 ms half-sine waveform conditions per JEDEC standards. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events.
Can SMAJ48A-13 be used in bidirectional signal lines like RS-485?
No - SMAJ48A-13 is unidirectional and conducts only during reverse-biased transients. For RS-485 or other AC-coupled or floating differential lines, the bi-directional variant SMAJ48CA-13 must be used to clamp both positive and negative excursions relative to common-mode voltage.
How does the SMA package affect thermal performance in continuous operation?
The SMA (DO-214AC) package delivers 1.0 W steady-state power dissipation at 75°C lead temperature. In PCB layouts with ≥1 cm² copper pour per pad and 2 oz copper, it achieves ~40°C/W junction-to-ambient; derating curves show 50% power capability at 100°C ambient.
Is SMAJ48A-13 compliant with RoHS and lead-free assembly requirements?
Yes - SMAJ48A-13 features matte tin plating qualified to J-STD-020C for lead-free reflow. It meets RoHS Directive 2011/65/EU (including exemptions for high-melting-temperature solders), with full compliance documentation available from Diodes Incorporated upon request.
SMAJ48A-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 5.2A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMAJ)
SMAJ48A-13 FAQ
1.How can I place an order for SMAJ48A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48A-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 SMAJ48A-13 reliable?
The price and inventory of SMAJ48A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ48A-13 is usually 5 days.
3.What payment methods are accepted for SMAJ48A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48A-13?
SMAJ48A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48A-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 SMAJ48A-13?
For technical support, including SMAJ48A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48A-13 requirements.
6.How does Aetrix verify that SMAJ48A-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ48A-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 SMAJ48A-13 meets industry standards.
7.What is the process for return or replacement of SMAJ48A-13?
All SMAJ48A-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48A-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 SMAJ48A-13 part is unused and in its original packaging.
Return procedure for SMAJ48A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ48A-13 Tags
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