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Diodes Incorporated SMAJ40CA-13-F
- Part No.:
- SMAJ40CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ40CA-13-F.pdf
- Description:
- TVS DIODE 40VWM 64.5VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:112,850
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Product details
Overview
SMAJ40CA-13-F from Diodes Incorporated is a bidirectional 400W transient voltage suppressor (TVS) diode in SMA package, designed for overvoltage protection of sensitive electronics against ESD, lightning, and inductive load switching transients. It features 40V reverse standoff voltage (VRWM), 64.5V max clamping voltage at 6.2A peak pulse current (IPP), and fast response time (<1 ns). Used in automotive power line protection and industrial I/O interface circuits.
For engineers reviewing the SMAJ40CA-13-F datasheet, SMAJ40CA-13-F pinout, SMAJ40CA-13-F application, or SMAJ40CA-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, peak pulse current capability under 8.3ms waveform, unidirectional vs. bidirectional polarity requirement, and IATF 16949 manufacturing compliance for automotive deployment.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified at 44.4–49.1V (min/max) under 1mA test current. Its clamping behavior is characterized by low dynamic impedance, enabling effective suppression of transients up to 400W peak pulse power (PPK) at TA = +25°C.
Thermal performance supports operation from –55°C to +150°C junction temperature, with steady-state power dissipation rated at 1.0W at TL = +75°C. The device uses glass-passivated die construction and meets RoHS 3, halogen-free, and antimony-free "Green" requirements per Diodes Incorporated specifications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms half-sine surge without failure, critical for lightning-level immunity testing (IEC 61000-4-5) |
| Reverse Standoff Voltage | 40V - maximum continuous DC or RMS voltage before significant leakage; sets upper limit for protected circuit operating voltage |
| Clamping Voltage | 64.5V @ 6.2A - maximum voltage seen by downstream circuit during worst-case transient; defines protection margin for 48V systems |
| Breakdown Voltage | 44.4–49.1V @ 1mA - ensures reliable turn-on before clamping threshold is exceeded, minimizing overshoot risk |
| Leakage Current | 5.0µA @ 40V - negligible standby power loss and signal integrity impact in high-impedance interfaces |
| Package | SMA - surface-mount outline compatible with standard reflow profiles; 0.064g mass enables automated placement |
Pinout & Package
Two-terminal SMA package: anode and cathode terminals are symmetrical for bidirectional operation; no polarity marking required. Case is molded plastic (UL 94V-0), with matte tin-plated leads solderable per MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Conducts surge current when voltage falls below –VRWM; forms symmetrical clamping path with cathode |
| Cathode | Transient current entry (positive polarity) | Conducts surge current when voltage exceeds +VRWM; enables bidirectional protection without external polarity management |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Enables robust protection against severe transients (e.g., ISO 7637-2 Pulse 1/2a/5a in 12V/24V automotive systems) |
| Glass Passivated Die | Improves reliability and moisture resistance versus epoxy-passivated alternatives; supports AEC-Q101 qualification path |
| Bidirectional Symmetry | Eliminates need for polarity-aware layout; simplifies PCB routing in AC-coupled or floating signal lines |
| RoHS 3 / Halogen-Free | Meets global environmental compliance mandates (Br+Cl <1500ppm, Sb <1000ppm); supports green manufacturing programs |
Applications
| Automotive Power Line Protection | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN/CAN bus power rails and microcontroller supply inputs in body control modules against load dump and jump-start surges. IC Role / Device Role: Primary overvoltage clamp placed between battery feed and LDO input, shunting transients before they reach voltage regulators. Use Value: Clamps 40V nominal 12V system transients to ≤64.5V, preserving regulator SOA and preventing brownout-induced MCU resets. | Use Scenario: Shielding PLC digital input channels from field-wiring induced surges in factory automation cabinets. IC Role / Device Role: Front-end transient suppressor on dry-contact or 24V sink-input traces, upstream of optocoupler or Schmitt trigger. Use Value: Limits voltage excursion to safe levels for 24V-rated isolation components, reducing false triggering and component stress during EFT bursts. |
| Telecom Interface Surge Suppression | Consumer Appliance Motor Drive Protection |
Use Scenario: Safeguarding RS-485 transceiver VCC and data lines in outdoor security camera power-over-coax (PoC) systems. IC Role / Device Role: Bidirectional clamp on shared 12V/24V PoC rail, handling both differential-mode and common-mode surges coupled onto coaxial cable. Use Value: Symmetric clamping prevents polarity inversion damage during lightning-induced common-mode events, maintaining communication link integrity. | Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart home appliances (e.g., vacuum cleaners, blenders). IC Role / Device Role: Across-motor terminals to absorb inductive kickback energy during MOSFET switch-off transitions. Use Value: Limits flyback voltage to 64.5V, protecting 60V-rated motor driver FETs and eliminating need for larger, costlier snubbers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-13-F | Unidirectional version; same VRWM, VBR, and VC, but only conducts for positive transients | Requires explicit polarity alignment; unsuitable for AC or floating signals | Select only when protecting DC rails with known fixed polarity and no negative-going transients |
| SMBJ40CA | Same electrical specs but SMB package (higher PPK = 600W, larger footprint, 1.0W PM(AV)) | Higher surge margin but occupies ~2.5× PCB area; requires revised land pattern | Choose when system-level surge testing exceeds 400W or thermal derating demands higher steady-state power handling |
Compared with SMAJ40A-13-F, the bidirectional variant eliminates polarity dependency in layout and supports AC-coupled interfaces; compared with SMBJ40CA, it trades surge headroom and thermal capacity for compactness-critical in space-constrained automotive ECUs and IoT edge nodes.
Availability
SMAJ40CA-13-F is available at Aetrix Electronics and suitable for automotive power line protection, industrial digital I/O protection, telecom interface surge suppression, and consumer appliance motor drive protection requiring stable component supply and full traceability.
Supply support for SMAJ40CA-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 North America.
This device belongs to the SMAJ series of surface-mount TVS diodes, engineered specifically for high-reliability transient suppression in automotive, industrial, and communications infrastructure where AEC-Q101 compliance, low clamping voltage, and rapid response are mandatory.
FAQ
What is the meaning of the 'C' suffix in SMAJ40CA-13-F?
The 'C' denotes bidirectional configuration: the device clamps transients of either polarity symmetrically, unlike unidirectional variants (e.g., SMAJ40A-13-F) that only protect against positive surges. This eliminates polarity-sensitive placement and supports AC or floating signal lines without external diode pairing.
Does SMAJ40CA-13-F meet AEC-Q101 qualification?
No-the standard SMAJ40CA-13-F is not AEC-Q101 qualified. Diodes offers an automotive-compliant version under separate part numbering (SMAJ40CAQ-13-F), manufactured in IATF 16949-certified facilities and qualified to AEC-Q101. Always verify qualification status via official Diodes Automotive Product Definitions web page before automotive use.
How does the 64.5V clamping voltage relate to system-level protection design?
The 64.5V clamping voltage (VC) is measured at 6.2A IPP under 8.3ms waveform and defines the maximum voltage imposed on downstream circuitry during worst-case transient. For a 48V nominal system, this provides 16.5V margin above operating voltage-sufficient to protect 60V-rated regulators and FETs while avoiding overdesign with higher-cost alternatives.
Can SMAJ40CA-13-F be used in parallel for higher surge current handling?
Not recommended without careful derating and matching: slight VBR variations between units cause current imbalance, leading to premature failure of the lower-breakdown device. For >6.2A IPP requirements, select a higher-power package (e.g., SMBJ40CA) or consult Diodes' application note AN-AB1001 on TVS paralleling techniques and thermal coupling considerations.
SMAJ40CA-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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 6.2A
- 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
SMAJ40CA-13-F FAQ
1.How can I place an order for SMAJ40CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ40CA-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 SMAJ40CA-13-F reliable?
The price and inventory of SMAJ40CA-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 SMAJ40CA-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ40CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ40CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ40CA-13-F?
SMAJ40CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ40CA-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 SMAJ40CA-13-F?
For technical support, including SMAJ40CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ40CA-13-F requirements.
6.How does Aetrix verify that SMAJ40CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ40CA-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 SMAJ40CA-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ40CA-13-F?
All SMAJ40CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ40CA-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 SMAJ40CA-13-F part is unused and in its original packaging.
Return procedure for SMAJ40CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ40CA-13-F Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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