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Diodes Incorporated SMBJ40CA-13-F
- Part No.:
- SMBJ40CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CA-13-F.pdf
- Description:
- TVS DIODE 40VWM 64.5VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:424,124
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Product details
Overview
SMBJ40CA-13-F from Diodes Incorporated is a bi-directional 600W surface-mount transient voltage suppressor (TVS) with 40V reverse standoff voltage, 64.5V max clamping voltage at 9.3A peak pulse current, and SMB package. It protects DC power rails and data lines in industrial motor drives, telecom power supplies, and automotive body control modules against ESD, lightning-induced surges, and inductive switching transients.
For engineers reviewing the SMBJ40CA-13-F datasheet, SMBJ40CA-13-F pinout, SMBJ40CA-13-F application, or SMBJ40CA-13-F equivalent, key selection criteria include clamping voltage margin relative to system operating voltage, peak pulse current capability under 8.3ms half-sine waveform, bi-directional symmetry for AC-coupled signal protection, and RoHS-compliant matte tin lead finish for lead-free reflow compatibility.
Technical Context
This TVS diode operates as a voltage-clamped crowbar device triggered by reverse-biased avalanche breakdown. Its glass-passivated silicon junction provides stable VBR (44.4–51.1V) and low leakage (<5µA @ 40V) across -55°C to +150°C junction temperature range.
Designed for non-repetitive surge suppression, it delivers 600W peak pulse power (8.3ms half-sine), derates linearly at 4.8W/°C above +25°C ambient, and sustains 100A forward surge current-enabling robust protection of 24V/48V industrial bus interfaces without thermal runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600W - Sustains single 8.3ms surge events common in IEC 61000-4-5 Level 4 testing. |
| Reverse Standoff Voltage | 40V - Maximum continuous DC or RMS AC voltage before clamping initiates; sets minimum system operating margin. |
| Breakdown Voltage | 44.4–51.1V @ 1mA - Tight VBR window ensures predictable turn-on without premature conduction. |
| Max Clamping Voltage | 64.5V @ 9.3A - Limits protected circuit voltage during surge; 24.5V headroom above 40V rail enables safe IC survival. |
| Peak Pulse Current | 9.3A - Validated under standard 10/1000µs waveform; correlates to ~600W dissipation at clamping voltage. |
| Junction Temperature Range | -55°C to +150°C - Supports operation in under-hood automotive and industrial enclosure environments. |
| Package | SMB - Surface-mount outline (5.59 × 4.06 × 2.21 mm) with UL 94V-0 flammability rating for PCB safety compliance. |
Pinout & Package
Bi-directional SMBJ40CA-13-F uses a 2-terminal SMB package with no polarity marking; both terminals are electrically symmetric. The molded plastic case features matte tin-plated leads solderable per MIL-STD-202 Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Either terminal conducts avalanche current during overvoltage on either polarity; no cathode band marking required. |
| Case (exposed pad) | Thermal conduction path | Non-electrical thermal interface; requires PCB copper pour for effective heat dissipation during surge events. |
Key Features
| Feature | Design Value |
|---|---|
| 600W peak pulse power | Enables compliance with IEC 61000-4-5 surge immunity up to 4kV (line-to-earth) in compact SMB footprint. |
| Glass-passivated die | Ensures long-term parameter stability and low leakage drift under thermal cycling and humidity stress. |
| Bi-directional architecture | Protects AC-coupled signals (e.g., RS-485, CAN FD) without polarity-sensitive placement on PCB. |
| RoHS-compliant matte tin finish | Supports Pb-free reflow profiles (peak 260°C) without whisker formation or solder joint reliability degradation. |
Applications
| Industrial Motor Drives | Telecom Power Supplies |
|---|---|
|
Use Scenario: Protection of 48V DC bus against inductive kickback from H-bridge MOSFET switching and load dump transients. IC Role / Device Role / Timing Role: Crowbar-type voltage clamp placed across input capacitor bank to limit bus overvoltage during fault conditions. Use Value: 64.5V clamping voltage maintains <10% overvoltage margin above 48V nominal rail, preventing damage to gate drivers and MCU power supplies. |
Use Scenario: Surge suppression on -48V telecom rectifier output feeding backplane distribution networks. IC Role / Device Role / Timing Role: Bi-directional transient shunt connected between -48V rail and chassis ground to absorb differential-mode lightning surges. Use Value: Symmetric clamping ensures equal protection for positive and negative excursions, critical for legacy -48V DC plant power systems. |
| Automotive Body Control Modules | RS-485 Data Line Protection |
|
Use Scenario: Input protection for LIN bus transceivers and microcontroller I/O pins exposed to battery line transients (ISO 7637-2 Pulse 1/2a/3a). IC Role / Device Role / Timing Role: Low-capacitance TVS placed at connector entry point to divert fast ESD (IEC 61000-4-2 ±15kV) and slow load-dump energy. Use Value: 9.3A peak pulse current rating exceeds ISO 7637-2 Pulse 5a requirements, enabling single-device compliance without series impedance. |
Use Scenario: Transient protection on full-duplex RS-485 differential pairs (A/B lines) in factory automation PLC networks. IC Role / Device Role / Timing Role: Bi-directional TVS pair (one per line) referenced to signal ground, suppressing common-mode surges induced by nearby motor switching. Use Value: 40V standoff allows operation with ±7V RS-485 common-mode range while clamping faults to <65V, preserving transceiver absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40A-13-F | Uni-directional version; includes cathode band marking and forward voltage drop (~3.5V @ 35A). | Requires correct polarity orientation; unsuitable for AC or bidirectional signal lines. | Select only when protecting unidirectional DC rails where polarity is fixed and forward conduction must be blocked. |
| SAC40CA | Same 40V standoff and bi-directional function but in DO-214AB (SMC) package; 1500W peak power rating. | Larger footprint (7.11 × 6.22 mm); higher thermal mass supports repeated surge events in high-duty-cycle systems. | Choose when system-level surge testing exceeds 600W single-pulse requirement or board layout permits larger package. |
Compared with SMBJ40CA-13-F, the uni-directional SMBJ40A-13-F adds polarity sensitivity but reduces design flexibility on AC paths, while SAC40CA trades PCB area for 2.5× higher surge capacity-making it suitable for mission-critical infrastructure where redundancy or multi-pulse endurance is required.
Availability
SMBJ40CA-13-F is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and automotive body control modules requiring stable component supply with full traceability and lifecycle management.
Supply support for SMBJ40CA-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, specializing in high-reliability protection, power management, and signal integrity solutions for industrial, automotive, and communications markets.
SMBJ40CA-13-F belongs to Diodes' SMBJ series of surface-mount TVS diodes, engineered specifically for cost-effective, space-constrained surge protection in harsh-environment power and data interfaces.
FAQ
What is the difference between SMBJ40CA-13-F and SMBJ40A-13-F?
SMBJ40CA-13-F is bi-directional with symmetrical clamping for AC or polarity-agnostic DC protection, while SMBJ40A-13-F is uni-directional and includes a cathode band for correct orientation. The 'C' suffix explicitly denotes bi-directionality per Diodes' part numbering convention, and the uni-directional version exhibits forward voltage conduction below breakdown.
Can SMBJ40CA-13-F be used in automotive applications?
Yes-SMBJ40CA-13-F meets AEC-Q200 stress test requirements for TVS diodes when qualified per Diodes' automotive-grade variants. Its -55°C to +150°C operating range, 100A surge rating, and RoHS-compliant matte tin finish support use in body control modules, infotainment power rails, and LIN bus I/O protection per ISO 7637-2 and ISO 16750-2 standards.
What is the thermal resistance junction-to-ambient for SMBJ40CA-13-F?
The SMBJ40CA-13-F has a typical junction-to-ambient thermal resistance of 125°C/W under standard JEDEC test conditions (single-layer 1-inch² copper pad). Actual RθJA depends on PCB copper area, layer count, and airflow; designs requiring repeated surges should use thermal vias and extended copper pours to reduce steady-state temperature rise.
How does the 64.5V clamping voltage impact system design?
The 64.5V clamping voltage at 9.3A defines the maximum voltage seen by downstream components during a surge event. For a 48V system, this provides 16.5V of overvoltage margin-sufficient to protect 75V-rated MOSFETs and 65V-input DC-DC converters without additional series impedance or active clamping circuits.
SMBJ40CA-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- 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):
- 9.3A
- Power - Peak Pulse:
- 600W
- 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:
- SMB
SMBJ40CA-13-F FAQ
1.How can I place an order for SMBJ40CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CA-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 SMBJ40CA-13-F reliable?
The price and inventory of SMBJ40CA-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 SMBJ40CA-13-F is usually 5 days.
3.What payment methods are accepted for SMBJ40CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CA-13-F?
SMBJ40CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CA-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 SMBJ40CA-13-F?
For technical support, including SMBJ40CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CA-13-F requirements.
6.How does Aetrix verify that SMBJ40CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMBJ40CA-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 SMBJ40CA-13-F meets industry standards.
7.What is the process for return or replacement of SMBJ40CA-13-F?
All SMBJ40CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CA-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 SMBJ40CA-13-F part is unused and in its original packaging.
Return procedure for SMBJ40CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40CA-13-F Tags
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Diodes Incorporated
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