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Taiwan Semiconductor Corporation SMBJ30CAH
- Part No.:
- SMBJ30CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ30CAH.pdf
- Description:
- TVS DIODE 30VWM 48.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,259
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Product details
Overview
SMBJ30CAH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 30V working stand-off voltage (VWM), and 48.4V maximum clamping voltage (VC) at 13.0A peak impulse current - designed to protect automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ30CAH datasheet, SMBJ30CAH pinout, SMBJ30CAH application, or SMBJ30CAH equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification, sub-1ps response time, <1µA leakage above 10V, and compliance with automotive EFT immunity requirements.
Technical Context
The SMBJ30CAH implements a glass-passivated silicon junction optimized for fast transient suppression in bidirectional signal and power lines. It delivers symmetrical breakdown behavior (min/max VBR = 33.3V / 36.8V at 1mA), operates across –55°C to +150°C junction temperature, and maintains clamping performance under 10/1000µs surge waveforms per ANSI/IEEE C62.35.
Its thermal design supports 10°C/W junction-to-case resistance and 55°C/W junction-to-ambient resistance, enabling reliable operation in high-density PCB layouts without forced airflow. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity - critical for reflow-compatible automotive manufacturing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 33.3 V / 36.8 V - Breakdown occurs within this range at 1 mA test current, ensuring predictable turn-on |
| VC @ IPP | 48.4 V at 13.0 A - Clamped voltage during 10/1000µs surge, limiting downstream IC stress |
| PPK | 600 W - Peak pulse power handling capability per single transient event |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery life and signal integrity in always-on circuits |
| Response time | <1.0 ps - Enables suppression of nanosecond-scale ESD and EFT events before damage occurs |
| TJ max | +150 °C - Supports under-hood automotive environments and industrial motor drive applications |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability; UL 94V-0 molding compound; polarity indicated by molded cathode band on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Transient return path (bidirectional) | Provides symmetrical conduction in both directions during overvoltage events |
| Cathode (banded end) | Transient return path (bidirectional) | Same functional role as anode due to bidirectional construction; no polarity dependency in circuit placement |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal and humidity stress |
| ISO 7637-2 compliance | Withstands defined automotive load-dump and inductive-switching transients without degradation |
| Level 1 moisture sensitivity | Enables standard SMT reflow without baking or special handling prior to assembly |
| Halogen-free (IEC 61249-2-21) | Meets RoHS and environmental compliance requirements for global automotive supply chains |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12V/24V battery-fed ECUs exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across power input to absorb energy from ISO 7637-2 Pulse 5a/b surges. Use Value: Limits rail voltage to ≤48.4V during 600W transients, preventing latch-up or burnout in MCU and CAN transceivers. | Use Scenario: Analog sensor outputs (e.g., pressure, temperature) routed through noisy factory environments. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp on differential or single-ended signal lines. Use Value: Suppresses EFT bursts up to ±2kV (IEC 61000-4-4) while maintaining signal fidelity via <1µA leakage at 30V. |
| LED Lighting Driver Protection | Motor Drive Gate Driver Protection |
Use Scenario: Constant-current LED drivers subjected to inductive switching noise from nearby relays or solenoids. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to shunt inductive kickback energy. Use Value: Clamps flyback spikes to 48.4V within <1ps, protecting MOSFETs and current-sense amplifiers from overvoltage failure. | Use Scenario: Half-bridge gate drivers controlling BLDC motors in HVAC or pump systems. IC Role / Device Role / Timing Role: Bidirectional protection on high-side and low-side gate drive traces against Miller-induced transients. Use Value: Prevents false turn-on and gate oxide rupture by clamping coupled noise to ≤48.4V with symmetrical VBR tolerance (±5.3%). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30CA | Same VWM (30V), VBR (33.3–36.8V), and VC (48.4V), but not AEC-Q101 qualified | Lacks automotive qualification; suitable for industrial/commercial designs without automotive certification requirements | Select SMBJ30CA only when AEC-Q101 is not mandated and cost optimization is prioritized |
| SAC30CA | Same 30V VWM and bidirectional configuration, but lower PPK (400W) and higher VC (53.3V at 10A) | Lower surge rating limits use to less severe transients; not compliant with ISO 7637-2 Pulse 5 | Choose SAC30CA only for space-constrained consumer applications where 600W headroom is unnecessary |
Compared with SMBJ30CA and SAC30CA, the SMBJ30CAH uniquely combines AEC-Q101 qualification, 600W surge capacity, and 48.4V clamping in a DO-214AA package - making it the only option among the three validated for automotive power rail protection per ISO 7637-2.
Availability
SMBJ30CAH is available at Aetrix Electronics and suitable for automotive control units, industrial sensor interfaces, LED lighting drivers, and motor drive gate protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMBJ30CAH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers with global automotive and industrial certifications.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments - emphasizing robustness, repeatable clamping, and reflow-ready packaging for high-volume SMT assembly.
FAQ
What is the clamping voltage of SMBJ30CAH under a 10/1000µs surge?
The SMBJ30CAH has a maximum clamping voltage (VC) of 48.4 V when subjected to a 13.0 A peak impulse current with a 10/1000µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components see limited overvoltage stress during standardized surge events. The SMBJ30CAH maintains this clamping performance across its full operating temperature range.
Is SMBJ30CAH suitable for automotive applications?
Yes, SMBJ30CAH is AEC-Q101 qualified and explicitly tested for ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transients - making it suitable for automotive power rail and signal line protection. Its DO-214AA package, Level 1 moisture sensitivity, and JESD201 Class 2 whisker resistance further support automotive manufacturing requirements. The SMBJ30CAH is designed for under-hood and ECU-level deployment.
How does SMBJ30CAH differ from unidirectional SMBJ30H?
SMBJ30CAH is bidirectional with symmetrical breakdown in both polarities (VBR = 33.3–36.8 V in either direction), while SMBJ30H is unidirectional and conducts only in reverse bias. SMBJ30CAH replaces two unidirectional devices in AC-coupled or floating signal paths and eliminates polarity concerns during placement. The SMBJ30CAH also features tighter VBR tolerance and identical 600W PPK rating.
What is the maximum leakage current of SMBJ30CAH at its working voltage?
At its 30 V working stand-off voltage (VWM), the SMBJ30CAH exhibits a maximum blocking leakage current (ID) of 1 µA at 25°C. This ultra-low leakage preserves system efficiency in battery-powered or always-on applications and avoids false triggering in high-impedance sensing circuits. The SMBJ30CAH maintains this specification across its full –55°C to +150°C operating junction temperature range.
Does SMBJ30CAH require special PCB layout considerations?
No special layout is required beyond standard high-current TVS practices: minimize trace inductance between SMBJ30CAH and protected node, use short direct paths to ground/power planes, and avoid routing sensitive signals near its terminals. Its DO-214AA package supports standard 0.95 mm pad spacing, and the SMBJ30CAH's bidirectional symmetry eliminates orientation constraints - simplifying automated placement and reducing assembly errors.
SMBJ30CAH 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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 48.4V
- Current - Peak Pulse (10/1000µs):
- 13A
- 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)
SMBJ30CAH FAQ
1.How can I place an order for SMBJ30CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ30CAH 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 SMBJ30CAH reliable?
The price and inventory of SMBJ30CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ30CAH is usually 5 days.
3.What payment methods are accepted for SMBJ30CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ30CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ30CAH?
SMBJ30CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ30CAH 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 SMBJ30CAH?
For technical support, including SMBJ30CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ30CAH requirements.
6.How does Aetrix verify that SMBJ30CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ30CAH 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 SMBJ30CAH meets industry standards.
7.What is the process for return or replacement of SMBJ30CAH?
All SMBJ30CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ30CAH, 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 SMBJ30CAH part is unused and in its original packaging.
Return procedure for SMBJ30CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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