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Taiwan Semiconductor Corporation SMBJ30CH
- Part No.:
- SMBJ30CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ30CH.pdf
- Description:
- 600W, 37V, 10%, BIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:6,861
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Product details
Overview
SMBJ30CH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 30 V working stand-off voltage (VWM), 53.5 V maximum clamping voltage (VC) at 11.7 A peak pulse current, and 600 W peak pulse power rating with <1.0 ps response time. It is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and inductive switching immunity.
For engineers reviewing the SMBJ30CH datasheet, SMBJ30CH pinout, SMBJ30CH application, or SMBJ30CH equivalent, this device is selected for robust bidirectional overvoltage protection in 24 V DC systems - especially where polarity-agnostic clamping, low leakage (<1 µA at 30 V), and DO-214AA (SMB) footprint compatibility are required.
Technical Context
The SMBJ30CH operates as a bidirectional avalanche diode, symmetrically clamping transients above ±33.3 V (min VBR) and below ±30 V (VWM) in both polarities. Its glass-passivated junction ensures stable breakdown characteristics and low leakage across -55°C to +150°C junction temperature range.
It delivers 600 W non-repetitive peak impulse power under 10/1000 µs waveform, with thermal resistance of 10°C/W (junction-to-case) and 55°C/W (junction-to-ambient), enabling reliable operation in compact PCB layouts without forced airflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 30 V - Maximum continuous reverse/forward voltage before clamping begins; defines safe operating margin for 24 V nominal systems. |
| VBR (min/max) | 33.3 V / 40.7 V - Breakdown occurs within this range at 1 mA test current; ensures consistent turn-on across production lots. |
| VC @ IPP | 53.5 V at 11.7 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to safe levels in automotive CAN/LIN or sensor supply lines. |
| PPK | 600 W - Peak pulse power handling capability; supports ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2b (battery disconnect). |
| ID @ VWM | <1 µA - Ultra-low blocking leakage at rated stand-off; preserves battery life in always-on vehicle modules. |
| Package | DO-214AA (SMB) - Standard surface-mount outline with 0.090 g mass; compatible with automated pick-and-place and reflow soldering per J-STD-002. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with cathode band marking; bidirectional symmetry means no anode/cathode orientation - terminals are functionally identical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as clamping node; polarity-insensitive connection simplifies layout and eliminates orientation errors. |
| Terminal 2 | Anode/Cathode (bidirectional) | Paired with Terminal 1 to form symmetrical clamping path; enables single-device protection across differential or floating rails. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood and chassis applications including temperature cycling, mechanical shock, and humidity testing. |
| ISO 7637-2 compliance | Guarantees immunity to standardized automotive transients (Pulse 1, 2a, 2b, 3a, 3b) without external circuitry. |
| Glass passivated junction | Ensures long-term stability of VBR and low IR drift over 15-year service life in harsh environments. |
| Moisture sensitivity level 1 | No dry-pack or baking required prior to reflow; supports standard SMT assembly processes without yield loss. |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS directives; suitable for global automotive OEM supply chains. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 24 V supply inputs of BCM microcontrollers and CAN transceivers from load-dump surges and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt energy before it reaches sensitive logic. Use Value: Limits transient voltage to ≤53.5 V during 11.7 A pulses, preventing latch-up or gate oxide damage in 3.3 V/5 V interface ICs. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controllers against field-wiring ESD and inductive kickback from solenoid valves. IC Role / Device Role / Timing Role: Primary front-end TVS on each input channel, operating in parallel with optocoupler input stages. Use Value: Withstands ≥1000 surges at rated PPK while maintaining sub-1 µA leakage - preserving signal integrity and reducing false triggering. |
| LED Headlamp Driver Power Stage | Automotive LIN Bus Transceiver Protection |
Use Scenario: Clamping voltage spikes generated by MOSFET switching in constant-current LED drivers for adaptive headlamps. IC Role / Device Role / Timing Role: Fast-response TVS placed across driver output to absorb inductive energy from LED string inductance. Use Value: Sub-1 ps response ensures clamping initiates before driver FETs experience overvoltage stress, extending MTBF beyond 15,000 hours. |
Use Scenario: Protecting LIN transceiver pins (LIN_H/L) from ESD events and coupled noise on shared vehicle harnesses. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp between LIN bus and ground, minimizing signal distortion. Use Value: Junction capacitance <100 pF at 0 V (per Fig.5) maintains LIN signal rise/fall times within ISO 17987-2 specification limits. |
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 (30 V), VBR (33.3–40.7 V), and DO-214AA package; identical electrical specs per ON Semiconductor datasheet. | Functionally identical bidirectional TVS; widely used in industrial automation BOMs with established qualification history. | Select SMBJ30CA when sourcing from ON Semi distribution channels or requiring cross-manufacturer second-source assurance. |
| P6SMB30CA | Same 30 V VWM and DO-214AA package; slightly higher VC (54.0 V vs. 53.5 V) and lower IPP (11.5 A vs. 11.7 A) per Littelfuse spec. | Marginally reduced clamping performance; acceptable for non-critical 24 V rail protection where 0.5 V headroom is available. | Choose P6SMB30CA only if SMBJ30CH is unavailable and system-level validation confirms 54.0 V clamping remains within downstream IC absolute max ratings. |
Compared with SMBJ30CA and P6SMB30CA, the SMBJ30CH offers identical clamping performance to SMBJ30CA but with AEC-Q101 certification explicitly stated in Taiwan Semiconductor's documentation - making it preferred for new automotive designs requiring formal qualification evidence.
Availability
SMBJ30CH is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, and LED lighting power stage surge suppression requiring stable component supply, full traceability, and long-lifecycle support.
Supply support for SMBJ30CH 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 headquartered in Hsinchu, Taiwan, specializing in discrete power devices, TVS diodes, and rectifiers for automotive and industrial markets.
The SMBJH series was developed specifically for AEC-Q101-compliant, high-reliability transient suppression in 12 V/24 V automotive subsystems - emphasizing low leakage, fast response, and robust thermal performance in DO-214AA packaging.
FAQ
What does the 'CH' suffix indicate in SMBJ30CH?
The 'CH' suffix in SMBJ30CH denotes a bidirectional configuration with cathode-band marking omitted - confirming symmetrical clamping behavior in both polarities. This distinguishes it from unidirectional variants like SMBJ30H and aligns with Taiwan Semiconductor's ordering convention for bipolar TVS diodes in the SMBJH series.
Is SMBJ30CH suitable for 24 V automotive power line protection?
Yes, SMBJ30CH is explicitly designed for 24 V nominal systems: its 30 V working stand-off voltage provides adequate margin above normal operating voltage, while its 53.5 V clamping voltage protects downstream 3.3 V/5 V ICs during ISO 7637-2 Pulse 1 and Pulse 2b events. AEC-Q101 qualification further validates its suitability for under-hood use.
Does SMBJ30CH require orientation during PCB placement?
No - SMBJ30CH is a bidirectional TVS diode with identical electrical behavior at both terminals; there is no anode or cathode functional distinction. The DO-214AA package lacks polarity marking, and the device clamps symmetrically regardless of mounting orientation, eliminating assembly errors.
What is the maximum junction temperature rating for SMBJ30CH?
The SMBJ30CH has a maximum junction temperature (TJ MAX) of +150°C, as specified in Taiwan Semiconductor's Absolute Maximum Ratings table. This allows operation in high-temperature automotive environments such as engine control units or headlamp modules when mounted on thermally optimized copper pours.
How does SMBJ30CH compare to SMBJ30AH in terms of clamping performance?
SMBJ30AH is a unidirectional variant with identical VWM (30 V) and VBR range but different clamping behavior: it conducts only in reverse bias, requiring correct polarity placement. SMBJ30CH clamps in both directions, offering simpler integration and eliminating risk of reverse installation - critical for field-serviceable or high-mix manufacturing.
SMBJ30CH 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:
- 53.5V
- Current - Peak Pulse (10/1000µs):
- 11.7A
- 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)
SMBJ30CH FAQ
1.How can I place an order for SMBJ30CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ30CH 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 SMBJ30CH reliable?
The price and inventory of SMBJ30CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ30CH is usually 5 days.
3.What payment methods are accepted for SMBJ30CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ30CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ30CH?
SMBJ30CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ30CH 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 SMBJ30CH?
For technical support, including SMBJ30CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ30CH requirements.
6.How does Aetrix verify that SMBJ30CH is sourced from the original manufacturer or authorized distributors?
All SMBJ30CH 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 SMBJ30CH meets industry standards.
7.What is the process for return or replacement of SMBJ30CH?
All SMBJ30CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ30CH, 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 SMBJ30CH part is unused and in its original packaging.
Return procedure for SMBJ30CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ30CH Tags
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