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Diodes Incorporated SMAJ48CA-13-F
- Part No.:
- SMAJ48CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CA-13-F.pdf
- Description:
- TVS DIODE 48VWM 77.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:262,654
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Product details
Overview
SMAJ48CA-13-F from Diodes Incorporated is a bidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for overvoltage protection in DC power lines and signal interfaces. It features a 48V reverse standoff voltage (VRWM), 53.3V minimum breakdown voltage (VBR), 77.4V maximum clamping voltage (VC) at 5.2A peak pulse current (IPP), and operates across –55°C to +150°C. It is used in automotive infotainment power rails to suppress load dump and ESD transients.
For engineers reviewing the SMAJ48CA-13-F datasheet, SMAJ48CA-13-F pinout, SMAJ48CA-13-F application, or SMAJ48CA-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, unidirectional vs. bidirectional polarity requirements, IEC 61000-4-2/4-5 compliance readiness, and SMA package thermal derating above +25°C ambient.
Technical Context
This bidirectional TVS diode uses glass-passivated silicon junction construction to achieve sub-nanosecond response time and stable clamping under repetitive 8.3ms half-sine surge pulses. Its symmetrical avalanche structure enables equal clamping in both polarities without external biasing.
It is rated for 400W non-repetitive peak pulse power (PPK) with 1.0W steady-state dissipation at TL = +75°C, and supports up to 40A peak forward surge current (IFSM) - enabling robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 4 surges when properly PCB-layout optimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single high-energy transients without failure (e.g., automotive load dump) |
| Reverse Standoff Voltage | 48V - maximum continuous DC voltage before significant leakage; sets upper limit of protected circuit operating range |
| Clamping Voltage @ IPP | 77.4V @ 5.2A - peak voltage seen by downstream circuit during worst-case 8.3ms surge; must stay below IC absolute max rating |
| Breakdown Voltage | 53.3–58.9V - onset of avalanche conduction; ensures reliable turn-on before clamping threshold exceeded |
| Operating Temperature | –55°C to +150°C - qualified for under-hood automotive environments and industrial power supplies |
| Package | SMA (DO-214AC) - standardized surface-mount footprint with 2.29–2.92mm height and 4.00–4.60mm width; compatible with automated reflow |
Pinout & Package
The SMAJ48CA-13-F is housed in an SMA (DO-214AC) plastic package with two terminals: Cathode Band omitted (bidirectional device). Polarity is not applicable; both terminals are functionally identical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient Conduction Path | Both terminals conduct identically during positive or negative overvoltage events; no orientation required on PCB |
| Case | Thermal Interface | Molded plastic body rated UL 94V-0; heat dissipation relies on copper pad area and trace width per JEDEC standards |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional Clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| Glass Passivation | Ensures long-term reliability and stable VBR/VC performance under humidity and thermal cycling stress |
| RoHS & Halogen-Free | Meets EU RoHS 3 (2015/863/EU) and Diodes' "Green" definition (<900ppm Br/Cl, <1000ppm Sb) |
| Moisture Sensitivity Level | MSL Level 1 - no dry-pack or bake requirement prior to assembly; simplifies manufacturing flow |
Applications
| Automotive Infotainment Power Rail | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protects 12V supply input of head unit MCU and audio amplifier from battery line transients including ISO 7637-2 Pulse 5a (load dump). IC Role / Device Role: Primary overvoltage clamp placed upstream of DC-DC converter input. Use Value: Limits voltage excursion to ≤77.4V, preventing damage to 36V-rated input capacitors and enabling use of lower-cost 50V-rated downstream components. | Use Scenario: Shields CAN transceiver PHY pins from ESD (IEC 61000-4-2 ±8kV contact) and fast transient bursts on vehicle chassis-ground-referenced bus lines. IC Role / Device Role: Bidirectional shunt protector tied between CANH/CANL and ground. Use Value: Symmetrical clamping maintains differential integrity during ± transients while adding <1.5pF capacitance per line - negligible impact on 1Mbps CAN signal integrity. |
| Smart Meter AC/DC Power Supply | Telecom DSL Line Card Protection |
Use Scenario: Guards primary-side rectifier output in switch-mode power supply against lightning-induced surges coupled via AC mains (IEC 61000-4-5 Level 3, 2kV line-earth). IC Role / Device Role: Secondary-stage TVS after MOV, providing precise clamping where MOV let-through voltage exceeds downstream rectifier rating. Use Value: 77.4V clamping allows use of 100V-rated electrolytic capacitors instead of 160V-rated units - reducing board space and cost. | Use Scenario: Protects ADSL/VDSL line driver/receiver ICs from induced surges on twisted-pair telephone lines exposed to outdoor wiring. IC Role / Device Role: Common-mode TVS connected between tip/ring and ground in front-end filter network. Use Value: 400W peak power rating handles multiple 10/1000µs surges without degradation; low leakage (<5µA @ 48V) prevents baseline signal distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48CA-E3/5A (Vishay) | Identical VRWM (48V), VC (77.4V), IPP (5.2A); same SMA package; MSL Level 1 | No AEC-Q200 qualification; not automotive PPAP-capable | Select for cost-sensitive industrial designs where automotive change control is unnecessary |
| P6SMB48CA (ON Semiconductor) | Same electrical specs but SMB package (larger footprint, higher thermal mass); 1.5W PM(AV) | Higher steady-state power handling enables longer surge duty cycles | Choose when board layout allows SMB and thermal design requires >1.0W continuous dissipation margin |
Compared with SMAJ48CA-13-F, the Vishay part offers identical protection performance in the same footprint but lacks automotive qualification support, while the ON Semiconductor SMB variant trades compactness for enhanced thermal endurance - making the Diodes device optimal for space-constrained AEC-Q200-compliant systems.
Availability
SMAJ48CA-13-F is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial CAN networks, smart meter power supplies, and telecom line card protection requiring stable component supply and full traceability.
Supply support for SMAJ48CA-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 high-reliability automotive and industrial surge protection where consistent clamping, low leakage, and AEC-Q200-compliant variants (SMAJxQ) are required.
FAQ
What is the meaning of the 'C' in SMAJ48CA?
The 'C' suffix denotes a bidirectional configuration - meaning the device provides symmetrical clamping for both positive and negative voltage transients. Unlike unidirectional versions (e.g., SMAJ48A), it has no cathode band and functions identically regardless of terminal orientation on the PCB.
Does SMAJ48CA-13-F meet AEC-Q200 requirements?
No - the standard SMAJ48CA-13-F is not AEC-Q200 qualified. Diodes offers a separate automotive-grade version, SMAJ48CAQ-13-F, which undergoes additional stress testing, PPAP documentation, and is manufactured in IATF 16949-certified facilities for automotive applications.
How does the SMA package affect thermal performance?
The SMA (DO-214AC) package has a thermal resistance of approximately 50°C/W junction-to-ambient (with standard 1-inch² copper pad). At 400W peak power, this limits safe operation to short-duration pulses; sustained surges require careful PCB copper area design and derating above +25°C ambient per Figure 1 in DS19005.
Can SMAJ48CA-13-F replace SMAJ48A in a design?
Only if the circuit is inherently symmetrical or AC-coupled. The unidirectional SMAJ48A requires correct polarity placement and clamps only negative transients on its cathode side; substituting the bidirectional SMAJ48CA eliminates orientation dependency but may alter leakage behavior in DC-biased paths due to dual-junction conduction.
SMAJ48CA-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:
- -
- Bidirectional Channels:
- 1
- 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:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAJ48CA-13-F FAQ
1.How can I place an order for SMAJ48CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CA-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 SMAJ48CA-13-F reliable?
The price and inventory of SMAJ48CA-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 SMAJ48CA-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ48CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CA-13-F?
SMAJ48CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CA-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 SMAJ48CA-13-F?
For technical support, including SMAJ48CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CA-13-F requirements.
6.How does Aetrix verify that SMAJ48CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ48CA-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 SMAJ48CA-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ48CA-13-F?
All SMAJ48CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CA-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 SMAJ48CA-13-F part is unused and in its original packaging.
Return procedure for SMAJ48CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ48CA-13-F Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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