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Taiwan Semiconductor Corporation SMBJ45CAH
- Part No.:
- SMBJ45CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45CAH.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,336
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Product details
Overview
SMBJ45CAH from Taiwan Semiconductor is a bidirectional transient voltage suppressor diode (TVS) designed for high-energy surge protection in automotive and industrial power rails. It features a 45 V working stand-off voltage, 72.7 V maximum clamping voltage at 8.6 A peak impulse current, and 600 W peak pulse power rating with sub-1 ps response time. It is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive ESD and load-dump immunity.
For engineers reviewing the SMBJ45CAH datasheet, SMBJ45CAH pinout, SMBJ45CAH application, or SMBJ45CAH equivalent, this device is selected for robust bidirectional overvoltage protection in 12 V/24 V vehicle subsystems, DC power input stages, and CAN/LIN bus interfaces where low clamping voltage and fast transient suppression are critical.
Technical Context
The SMBJ45CAH implements a glass-passivated silicon junction optimized for bidirectional clamping without polarity dependence. Its breakdown voltage range is 50.0–55.3 V at 1 mA test current, ensuring reliable conduction onset above nominal system voltage while maintaining low leakage (<1 µA at 45 V).
Thermally, it uses a DO-214AA (SMB) package with 10 °C/W junction-to-case and 55 °C/W junction-to-ambient thermal resistance, enabling sustained operation up to 150 °C junction temperature under pulsed stress per IEC 61000-4-5 and ISO 7637-2 waveforms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin above 12 V/24 V rail nominal levels. |
| VBR min/max | 50.0 / 55.3 V - Breakdown occurs within this range at 1 mA; ensures predictable turn-on during transients. |
| VC @ IPP | 72.7 V - Clamps 8.6 A 10/1000 µs surge to ≤72.7 V, limiting downstream IC stress in automotive power domains. |
| PPK | 600 W - Peak pulse power handling per single 10/1000 µs waveform; supports ISO 7637-2 Pulse 1 and 2b compliance. |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery life in always-on vehicle modules such as body control units. |
| TJ max | +150 °C - Enables placement near hot components (e.g., power converters, engine ECUs) without derating concerns. |
| Response time | <1.0 ps - Sub-picosecond junction response ensures clamping initiates before transient energy couples into sensitive circuitry. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; bidirectional configuration means both terminals function identically-no anode/cathode assignment required. Matte tin-plated leads meet J-STD-002 solderability and JESD 201 Class 2 whisker resistance requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal A | Bidirectional surge port | Connects to protected line (e.g., CAN_H, +12V rail); conducts equally in either direction during overvoltage events. |
| Terminal B | Bidirectional surge port | Connects to reference plane (e.g., chassis ground, GND); completes low-impedance path for transient current diversion. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood and cabin environments including thermal cycling, humidity, and mechanical shock per AEC standard. |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (ESD coupling) without degradation. |
| Glass passivated junction | Enhances long-term reliability and moisture resistance versus epoxy-passivated alternatives; supports MSL Level 1 handling. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive; suitable for green manufacturing and end-of-life recycling requirements. |
| Low clamping ratio (VC/VBR) | ~1.31 (72.7 V / 55.3 V) - Minimizes overvoltage overshoot during clamping, reducing stress on downstream TVS-coupled ICs. |
Applications
| Automotive Power Rail Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs (e.g., lighting control, seat motor drivers) against load dump and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input rail and chassis ground to clamp transients before they reach DC-DC regulators and microcontrollers. Use Value: Limits peak voltage to 72.7 V during 8.6 A ISO 7637-2 Pulse 2b events, preventing latch-up or permanent damage in 3.3 V/5 V logic supplies. | Use Scenario: Shielding high-speed CAN FD transceivers from ESD and coupled noise in vehicle wiring harnesses. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp installed differential-mode across CAN_H/CAN_L lines near connector entry point. Use Value: Sub-1 ps response ensures clamping activates before transceiver input stages experience destructive overvoltage, preserving signal integrity at 5 Mbps. |
| Industrial DC Input Stage | LED Driver Surge Immunity |
Use Scenario: Safeguarding programmable logic controllers (PLCs) and I/O modules connected to unregulated 24 V factory power buses. IC Role / Device Role / Timing Role: Primary surge arrestor mounted at board-level power entry, upstream of EMI filters and bulk capacitors. Use Value: 600 W peak power rating absorbs repetitive 10/1000 µs surges per IEC 61000-4-5 Level 4 without parameter shift or thermal runaway. | Use Scenario: Protecting constant-current LED drivers in streetlight and signage applications exposed to lightning-induced surges on AC mains input. IC Role / Device Role / Timing Role: Bidirectional TVS placed across bridge rectifier output to suppress line-to-line and line-to-ground transients. Use Value: 45 V VWM aligns with typical 36–42 V LED string forward voltage, allowing normal operation while clamping >50 V spikes to safe levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45CA | Same VWM (45 V), but lower PPK (400 W vs. 600 W); VBR min/max = 50.0–53.3 V; VC = 72.7 V @ 5.7 A. | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); not rated for ISO 7637-2 Pulse 1 or 2b. | Select SMBJ45CA only when cost sensitivity outweighs automotive-grade surge margin and AEC-Q101 requirement. |
| SMCJ45CA | Same VWM and bidirectional function, but larger DO-214AB (SMC) package; higher PPK (1500 W); VC = 73.0 V @ 20.5 A. | Requires larger PCB footprint and higher thermal mass; suited for primary-level protection in high-power inverters or chargers. | Choose SMCJ45CA when system-level surge energy exceeds 600 W or when board layout allows larger SMC footprint. |
Compared with SMBJ45CA and SMCJ45CA, the SMBJ45CAH delivers optimal balance of AEC-Q101 compliance, 600 W surge capacity, and compact SMB footprint-making it the preferred choice for space-constrained automotive modules requiring full ISO 7637-2 immunity without redesigning thermal or mechanical layout.
Availability
SMBJ45CAH is available at Aetrix Electronics and suitable for automotive electronics, industrial power supplies, and LED driver designs requiring stable component supply with full AEC-Q101 traceability and ISO 7637-2 validation.
Supply support for SMBJ45CAH 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in high-reliability protection devices and power management components.
The SMBJH series was developed specifically for automotive-grade transient suppression, targeting AEC-Q101 compliance, ISO 7637-2 immunity, and robust thermal performance in under-hood and chassis-mounted electronic control units.
FAQ
What does the 'CAH' suffix indicate in SMBJ45CAH?
The 'CAH' suffix in SMBJ45CAH denotes a bidirectional TVS diode ('C') with AEC-Q101 qualification ('A') and halogen-free construction ('H'). Unlike unidirectional variants (e.g., SMBJ45H), SMBJ45CAH provides symmetrical clamping in both polarities-critical for protecting differential buses like CAN or AC-coupled signal lines without polarity constraints.
How does SMBJ45CAH differ from SMBJ45AH?
SMBJ45AH is unidirectional with cathode marking and forward voltage drop (~3.5 V), whereas SMBJ45CAH is bidirectional with no polarity marking and identical clamping behavior in both directions. SMBJ45CAH's VBR range is 50.0–55.3 V and VC is 72.7 V @ 8.6 A, while SMBJ45AH has VBR 50.0–55.3 V but VC 72.7 V @ 8.6 A only in reverse-forward conduction is not specified for clamping use.
Is SMBJ45CAH suitable for protecting CAN FD interfaces?
Yes, SMBJ45CAH is suitable for CAN FD interface protection due to its sub-1 ps response time, low clamping voltage (72.7 V), and bidirectional symmetry. When placed differential-mode across CAN_H/CAN_L near the connector, it suppresses ESD and coupled transients without distorting the 5 Mbps signal waveform-validated by TSC's ISO 7637-2 Pulse 3b testing.
What is the maximum junction temperature rating for SMBJ45CAH?
The maximum junction temperature (TJ max) for SMBJ45CAH is +150 °C, as confirmed in the Absolute Maximum Ratings table. This enables reliable operation in under-hood automotive environments and industrial enclosures where ambient temperatures exceed 105 °C, provided PCB copper area and airflow meet thermal derating guidelines per Figure 2 in the datasheet.
Does SMBJ45CAH meet RoHS and halogen-free requirements?
Yes, SMBJ45CAH complies with EU RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The molding compound contains no brominated flame retardants or chlorine-based additives, and lead content is below 1000 ppm-verified in TSC's material declarations and certified by third-party lab testing.
SMBJ45CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 8.6A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ45CAH FAQ
1.How can I place an order for SMBJ45CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45CAH 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 SMBJ45CAH reliable?
The price and inventory of SMBJ45CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ45CAH is usually 5 days.
3.What payment methods are accepted for SMBJ45CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45CAH?
SMBJ45CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45CAH 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 SMBJ45CAH?
For technical support, including SMBJ45CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45CAH requirements.
6.How does Aetrix verify that SMBJ45CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ45CAH 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 SMBJ45CAH meets industry standards.
7.What is the process for return or replacement of SMBJ45CAH?
All SMBJ45CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45CAH, 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 SMBJ45CAH part is unused and in its original packaging.
Return procedure for SMBJ45CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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