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Taiwan Semiconductor Corporation SMBJ15CAH
- Part No.:
- SMBJ15CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ15CAH.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,191
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Product details
Overview
SMBJ15CAH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade ESD and surge protection in DC power rails and signal lines. It features a 15 V working stand-off voltage (VWM), 24.4 V maximum clamping voltage at 25.1 A peak pulse current, 600 W peak pulse power rating, and AEC-Q101 qualification for under-hood and infotainment applications.
For engineers reviewing the SMBJ15CAH datasheet, SMBJ15CAH pinout, SMBJ15CAH application, or SMBJ15CAH equivalent, key selection considerations include its bidirectional configuration, DO-214AA (SMB) package compatibility with automated SMT assembly, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and low leakage (<1 µA at 15 V) for battery-sensitive systems.
Technical Context
The SMBJ15CAH operates as a silicon avalanche diode with glass-passivated junction, enabling sub-1 ps response to transients and stable clamping performance across -55°C to +150°C junction temperature. Its bidirectional architecture allows symmetrical suppression of positive and negative polarity surges without external polarity management.
It delivers 600 W non-repetitive peak pulse power (10/1000 µs waveform) with thermal resistance RθJA = 55°C/W and RθJC = 10°C/W, supporting sustained operation in high-ambient environments when mounted on thermally adequate PCB copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous DC or RMS voltage the device blocks without clamping; defines safe operating margin below breakdown. |
| VBR min / max | 16.7 V / 18.5 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on threshold across production lot. |
| VC @ IPP | 24.4 V at 25.1 A - Clamping voltage during 10/1000 µs surge; limits downstream IC stress to ≤24.4 V under worst-case 600 W transient. |
| IPP | 25.1 A - Peak surge current supported at rated clamping voltage; determines minimum trace width and fuse coordination. |
| ID @ VWM | <1 µA - Reverse leakage at 15 V; critical for low-power always-on circuits (e.g., CAN bus standby, sensor wake-up logic). |
| PPK | 600 W - Non-repetitive peak pulse power handling per 10/1000 µs waveform; validates robustness against load dump and EFT events. |
| TJ max | +150°C - Maximum junction temperature; enables placement near heat sources (e.g., power converters, motor drivers) with appropriate thermal relief. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional, cathode band not applicable (symmetrical terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (bidirectional) | Surge current path | Either terminal conducts during positive or negative overvoltage; no polarity dependency simplifies PCB layout and eliminates orientation errors. |
| Case (cathode band absent) | Thermal and mechanical interface | Exposed metal slug provides primary thermal path to PCB copper; requires ≥25 mm² 2-oz copper pad for full 600 W derating. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements (HTOL, TC, UHAST, etc.), enabling use in ADAS, body control, and infotainment modules. |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT) without degradation-no external filtering needed. |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement before reflow; compatible with standard SMT assembly lines without special handling. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under humidity and thermal cycling; eliminates risk of junction corrosion in harsh environments. |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive; supports green manufacturing and end-of-life recycling compliance. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery rail in engine control unit exposed to load dump (up to 40 V) and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional TVS clamp limiting rail voltage to ≤24.4 V during transients, protecting MCU, CAN transceivers, and analog front-ends. Use Value: Eliminates need for series resistors or RC filters while maintaining <1 µA leakage to preserve sleep-mode current budget. |
Use Scenario: 4–20 mA current loop input of PLC analog module subjected to EFT bursts per IEC 61000-4-4. IC Role / Device Role / Timing Role: Fast-clamping protection at signal entry point, shunting >90% of 5 kV EFT energy before it reaches op-amp input stage. Use Value: Maintains signal integrity with <1 ps response and 24.4 V clamping, preventing latch-up or parametric drift in precision ADC drivers. |
| LED Lighting Driver Protection | Automotive Infotainment USB Port Protection |
Use Scenario: Constant-current LED driver output subjected to inductive kickback from relay switching in headlight modules. IC Role / Device Role / Timing Role: Transient suppression across output terminals, absorbing 600 W spikes without failure or parameter shift. Use Value: Enables single-device protection with DO-214AA footprint-no secondary crowbar or MOV required-reducing BOM count and board space. |
Use Scenario: USB 2.0 data lines (D+/D−) and VBUS in center console unit exposed to ESD per IEC 61000-4-2 (±15 kV air, ±8 kV contact). IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp (CJ ≈ 100 pF at 0 V) placed directly at connector to prevent ESD-induced data corruption. Use Value: Clamps to <24.4 V while adding <0.5 pF parasitic capacitance per line-preserving USB 480 Mbps eye diagram integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ15CA | Same DO-214AC (SMA) package; 24.4 V VC @ 25.1 A; slightly higher RθJA (65°C/W vs. 55°C/W). | Lower power density due to smaller package; limited to ≤400 W in same PCB layout. | Select when legacy SMA footprint is fixed and thermal margin exists; verify derating curves match system ambient. |
| ON Semiconductor 1.5SMC15CA | DO-214AB (SMC) package; 24.4 V VC @ 25.1 A; higher PPK (1500 W) but larger footprint and 1.1 g weight. | Better thermal mass for repetitive surges; incompatible with SMB land pattern without redesign. | Choose for high-cycle industrial applications where board space permits and 1500 W headroom is required. |
Compared with SMBJ15CAH, SMAJ15CA offers footprint compatibility only if migrating from SMA, while 1.5SMC15CA delivers higher surge capacity at the cost of size and weight-neither is pin-compatible, but both serve overlapping protection roles with distinct thermal and layout trade-offs.
Availability
SMBJ15CAH is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, and LED lighting driver protection requiring stable component supply and AEC-Q101 assurance.
Supply support for SMBJ15CAH 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 TVS diodes, rectifiers, and power MOSFETs since 1979.
The SMBJH series was developed specifically for AEC-Q101-compliant automotive and industrial surge protection, emphasizing robustness, low leakage, and automated assembly readiness in the DO-214AA package.
FAQ
What does the "CAH" suffix indicate in SMBJ15CAH?
The "CAH" suffix denotes a bidirectional configuration with AEC-Q101 qualification and halogen-free construction. Unlike unidirectional "H" variants, SMBJ15CAH clamps symmetrically for both polarities-critical for AC-coupled lines or floating grounds. It meets J-STD-020 moisture sensitivity level 1 and IEC 61249-2-21 halogen-free standards.
Does SMBJ15CAH require a heatsink for 600 W surge handling?
No external heatsink is required for single-event 600 W surges, provided the PCB uses ≥25 mm² of 2-ounce copper connected to both terminals. The SMBJ15CAH's RθJC = 10°C/W and RθJA = 55°C/W are specified for that copper area. For repetitive surges, thermal simulation using JEDEC JESD51-2 is recommended to confirm junction temperature stays below +150°C.
How does SMBJ15CAH compare to SMBJ15A in terms of clamping performance?
SMBJ15CAH has identical clamping voltage (24.4 V at 25.1 A) and working voltage (15 V) as SMBJ15A, but adds AEC-Q101 qualification, ISO 7637-2 compliance, and halogen-free packaging. SMBJ15A lacks automotive validation and may not meet Pulse 1 load dump immunity-SMBJ15CAH is the designated upgrade for automotive designs.
Can SMBJ15CAH be used in place of a unidirectional SMBJ15H?
No-SMBJ15CAH is bidirectional and lacks polarity marking; replacing unidirectional SMBJ15H requires circuit review. In DC-only applications, SMBJ15CAH will function but wastes design margin on reverse conduction. For new designs targeting bidirectional threat models (e.g., CAN, USB, RS-485), SMBJ15CAH is preferred; for simple DC rail clamp, SMBJ15H remains optimal.
What is the maximum allowable PCB trace length between SMBJ15CAH and protected IC?
To maintain sub-1 ps response, keep traces under 5 mm total length (including vias) from SMBJ15CAH terminals to the IC pins. Longer traces add inductance that degrades clamping speed-measurements show >10 mm increases VC by up to 12% during 8/20 µs transients. Use solid ground plane and minimize loop area between anode/cathode paths.
SMBJ15CAH 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):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 25.1A
- 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)
SMBJ15CAH FAQ
1.How can I place an order for SMBJ15CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ15CAH 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 SMBJ15CAH reliable?
The price and inventory of SMBJ15CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ15CAH is usually 5 days.
3.What payment methods are accepted for SMBJ15CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ15CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ15CAH?
SMBJ15CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ15CAH 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 SMBJ15CAH?
For technical support, including SMBJ15CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ15CAH requirements.
6.How does Aetrix verify that SMBJ15CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ15CAH 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 SMBJ15CAH meets industry standards.
7.What is the process for return or replacement of SMBJ15CAH?
All SMBJ15CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ15CAH, 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 SMBJ15CAH part is unused and in its original packaging.
Return procedure for SMBJ15CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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