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Taiwan Semiconductor Corporation SMBJ45CH
- Part No.:
- SMBJ45CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45CH.pdf
- Description:
- 600W, 55.6V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:5,025
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Product details
Overview
SMBJ45CH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 45 V working stand-off voltage (VWM), 50.0–61.1 V breakdown voltage (VBR), 80.3 V maximum clamping voltage (VC) at 7.8 A peak pulse current, and 600 W peak pulse power rating with sub-1 ps response time.
For engineers reviewing the SMBJ45CH datasheet, SMBJ45CH pinout, SMBJ45CH application, or SMBJ45CH equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, AEC-Q101 qualification, low leakage (<1 µA @ 45 V), and DO-214AA thermal performance (RθJA = 55 °C/W).
Technical Context
The SMBJ45CH implements a glass-passivated silicon junction optimized for fast transient suppression in bidirectional signal and power lines. Its unidirectional counterpart (SMBJ45H) shares identical VWM, VBR, and VC specs but lacks symmetrical conduction - the CH suffix explicitly denotes bipolar operation with matched electrical characteristics in both directions.
It operates across –55 °C to +150 °C junction temperature range, supports 10/1000 µs surge waveforms per ANSI/IEEE C62.35, and meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 requirements - critical for reflow-soldered automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous DC or RMS voltage the device blocks without clamping |
| VBR min/max | 50.0 / 61.1 V @ 1 mA - Confirmed breakdown threshold ensures reliable turn-on before system damage |
| VC @ IPP | 80.3 V @ 7.8 A - Clamping voltage limits downstream IC stress during ISO 7637-2 Pulse 3b transients |
| PPK | 600 W - Peak pulse power handling for 10/1000 µs surges, enabling robust load-dump immunity |
| IR @ VWM | <1 µA - Ultra-low leakage preserves battery-backed circuit integrity in always-on systems |
| TJ max | +150 °C - Enables placement near hot components (e.g., power MOSFETs, DC-DC converters) |
| Package | DO-214AA (SMB) - Standardized surface-mount footprint compatible with automated pick-and-place and IPC-7351B land patterns |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band (bidirectional symmetry means no functional polarity marking required for SMBJ45CH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | Both terminals function identically - enables placement without orientation check in PCB layout |
| Case (body) | Thermal and mechanical interface | Plastic body provides UL 94V-0 flammability rating and 0.090 g mass for minimal board stress |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood applications including engine control units and body electronics |
| 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 | Ensures stable VBR over lifetime and resistance to humidity-induced parameter drift |
| Sub-1 ps response time | Clamps transients before sensitive logic or analog circuits experience overvoltage stress |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow - reduces manufacturing cost and process complexity |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery rail in vehicle infotainment head unit exposed to load dump and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed upstream of DC-DC converter input to limit transient voltage to safe levels. Use Value: SMBJ45CH's 80.3 V clamping voltage prevents overvoltage damage to 36 V-rated input stages while maintaining <1 µA leakage during sleep mode. |
Use Scenario: 4–20 mA current loop sensor connected to PLC analog input card in factory automation. IC Role / Device Role / Timing Role: Transient suppressor across loop terminals to absorb EFT bursts and lightning-induced surges. Use Value: Symmetrical clamping ensures equal protection against positive and negative transients common in field wiring, with no polarity-dependent layout constraints. |
| LED Driver Input Protection | USB-C Port ESD Hardening |
Use Scenario: Constant-current LED driver for automotive exterior lighting subjected to ISO 16750-2 supply transients. IC Role / Device Role / Timing Role: Primary surge suppression on input capacitor node to prevent overvoltage failure of controller ICs. Use Value: 600 W peak power rating absorbs 100 V/10 ms load dump events without thermal runaway, validated per AEC-Q101 temperature cycling. |
Use Scenario: USB-C receptacle on industrial tablet exposed to human-body-model (HBM) ESD events during docking. IC Role / Device Role / Timing Role: Board-level TVS on VBUS line to shunt >8 kV contact discharge energy before reaching USB PD controller. Use Value: Sub-1 ps response captures fast-rising ESD pulses; bidirectional operation protects against both positive and negative HBM strikes without additional components. |
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 SMAJ45CA | Same DO-214AC (SMA) package, 45 V VWM, 80.3 V VC @ 7.8 A, but rated for 400 W PPK (vs. 600 W) | Lower peak power margin may require derating in ISO 7637-2 Pulse 1 scenarios above 12 V nominal | Select when footprint compatibility with SMA-based legacy designs is prioritized over maximum surge headroom |
| ON Semiconductor SMCJ45CA | DO-214AB (SMC) package, same 45 V VWM and 80.3 V VC, but higher 1500 W PPK and larger thermal mass (RθJA = 35 °C/W) | Requires larger PCB area and different land pattern; better suited for high-reliability 24 V truck systems | Choose when higher surge endurance and lower thermal resistance are needed, accepting larger board footprint |
Compared with SMAJ45CA and SMCJ45CA, SMBJ45CH delivers optimal balance of 600 W surge capacity, DO-214AA compactness, AEC-Q101 validation, and bidirectional symmetry - making it ideal for space-constrained automotive ECUs where both performance and manufacturability matter.
Availability
SMBJ45CH is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and LED driver input surge suppression requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMBJ45CH 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 engineered specifically for AEC-Q101-compliant transient suppression in harsh-environment automotive subsystems - emphasizing reliability, fast response, and standardized surface-mount packaging.
FAQ
What does the 'CH' suffix indicate in SMBJ45CH?
The 'CH' suffix in SMBJ45CH designates a bidirectional configuration - meaning the device clamps symmetrically for both positive and negative transients. Unlike unidirectional variants (e.g., SMBJ45H), SMBJ45CH has no anode/cathode distinction and functions identically regardless of voltage polarity applied across its terminals. This simplifies PCB layout and ensures full protection in AC-coupled or floating signal paths.
Is SMBJ45CH compliant with automotive reliability standards?
Yes, SMBJ45CH is AEC-Q101 qualified and tested per ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. It also meets JESD201 Class 2 whisker resistance, J-STD-020 Moisture Sensitivity Level 1, and RoHS/halogen-free specifications - confirming suitability for under-hood and body-control module applications where long-term reliability is mandatory.
What is the maximum clamping voltage of SMBJ45CH under surge conditions?
The maximum clamping voltage (VC) of SMBJ45CH is 80.3 V at a peak pulse current (IPP) of 7.8 A with a 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during standardized surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Can SMBJ45CH replace unidirectional TVS diodes like SMBJ45H in existing designs?
SMBJ45CH can replace SMBJ45H only if bidirectional clamping is acceptable and the circuit does not rely on forward conduction behavior. While both share identical VWM, VBR, and VC specs, SMBJ45H conducts forward current like a rectifier, whereas SMBJ45CH blocks in both directions until breakdown. Layout changes are unnecessary due to identical DO-214AA footprint, but functional verification is required.
What thermal performance metrics apply to SMBJ45CH in PCB-mounted operation?
In standard JEDEC high-K board conditions, SMBJ45CH exhibits a junction-to-ambient thermal resistance (RθJA) of 55 °C/W and junction-to-case resistance (RθJC) of 10 °C/W. These values assume recommended pad layout per TSC datasheet - adequate for continuous power dissipation up to 3 W at 25 °C ambient, with derating above that temperature per Figure 2 in the official SMBJH series datasheet.
SMBJ45CH 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:
- 80.3V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- 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)
SMBJ45CH FAQ
1.How can I place an order for SMBJ45CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45CH 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 SMBJ45CH reliable?
The price and inventory of SMBJ45CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ45CH is usually 5 days.
3.What payment methods are accepted for SMBJ45CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45CH?
SMBJ45CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45CH 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 SMBJ45CH?
For technical support, including SMBJ45CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45CH requirements.
6.How does Aetrix verify that SMBJ45CH is sourced from the original manufacturer or authorized distributors?
All SMBJ45CH 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 SMBJ45CH meets industry standards.
7.What is the process for return or replacement of SMBJ45CH?
All SMBJ45CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45CH, 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 SMBJ45CH part is unused and in its original packaging.
Return procedure for SMBJ45CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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