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Taiwan Semiconductor Corporation SMBJ43CH
- Part No.:
- SMBJ43CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43CH.pdf
- Description:
- 600W, 53.1V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:9,287
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Product details
Overview
SMBJ43CH from Taiwan Semiconductor is a bidirectional 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 43 V working stand-off voltage (VWM), 47.8–58.4 V breakdown voltage (VBR), 76.7 V maximum clamping voltage (VC) at 8.2 A peak pulse current (IPP), and 600 W peak pulse power (PPK) with <1.0 ps response time.
For engineers reviewing the SMBJ43CH datasheet, SMBJ43CH pinout, SMBJ43CH application, or SMBJ43CH equivalent, key selection criteria include unidirectional vs. bidirectional configuration (CH suffix = bidirectional), ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, AEC-Q101 qualification, and clamping performance under 10/1000 µs transients in 12 V/24 V automotive subsystems.
Technical Context
The SMBJ43CH implements a glass-passivated silicon junction optimized for fast transient suppression in bidirectional signal and power lines. Its symmetrical I-V characteristics enable identical clamping behavior in both polarities, supporting robust protection of differential buses and AC-coupled interfaces without polarity constraints.
Thermal design is enabled by RθJC = 10 °C/W and RθJA = 55 °C/W, allowing sustained operation up to TJ = 150 °C. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, ensuring reliability in reflow-soldered automotive PCB assemblies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe DC/AC rail margin for 12 V/24 V systems. |
| VBR (min/max) | 47.8 / 58.4 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on across temperature and process variation. |
| VC @ IPP | 76.7 V @ 8.2 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to ≤76.7 V under worst-case 600 W transient. |
| PPK | 600 W - Peak non-repetitive pulse power handling per IEC 61000-4-5; supports Level 4 ESD immunity and load-dump survivability. |
| IR @ VWM | <1 µA - Ultra-low leakage at rated stand-off voltage; prevents battery drain in always-on automotive modules. |
| Response time | <1.0 ps - Sub-picosecond junction response enables suppression before transient energy couples into protected circuitry. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; bidirectional configuration means both terminals are functionally symmetric-no anode/cathode distinction in circuit use.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Bidirectional TVS terminal | Either side connects to protected line; symmetrical clamping ensures identical protection regardless of voltage polarity. |
| Terminal 2 | Bidirectional TVS terminal | Paired with Terminal 1 to form a two-terminal, polarity-agnostic surge shunt path to ground or rail. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive underhood and cabin applications per stress test requirements including HTOL, TC, and HAST. |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) without degradation. |
| Glass passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives, critical for 15+ year automotive service life. |
| Moisture sensitivity level 1 | Zero floor-life limitation; can be stored indefinitely and processed directly in standard SMT reflow without baking. |
Applications
| Automotive Power Rail Protection | Industrial CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional shunt clamp placed between power rail and chassis ground to divert >100 V transients. Use Value: Limits rail voltage to ≤76.7 V during 600 W pulses, preventing damage to MCU, LIN transceivers, and sensor front-ends. |
Use Scenario: Safeguarding CANH/CANL differential pair in vehicle body control modules. IC Role / Device Role / Timing Role: Two SMBJ43CH devices deployed in back-to-back configuration across CANH–CANL and each line–ground. Use Value: Maintains signal integrity during EFT bursts (IEC 61000-4-4) and ISO 7637-2 Pulse 3b by clamping common-mode spikes below 80 V. |
| LED Lighting Driver Input Protection | Smart Sensor Signal Line Protection |
Use Scenario: Guarding constant-current LED drivers in automotive headlamps from alternator ripple and ignition noise. IC Role / Device Role / Timing Role: Placed across input capacitor terminals to absorb repetitive 100 ns–1 ms transients. Use Value: Withstands ≥1000 surges at 8.2 A without parameter shift, enabling >10-year field reliability in harsh thermal cycling environments. |
Use Scenario: Shielding analog output pins (e.g., 4–20 mA, 0–5 V) of pressure/temperature sensors in engine bay. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF at 0 V) bidirectional clamp minimizing signal distortion on precision outputs. Use Value: Delivers sub-1 ps response and <1 µA leakage to preserve measurement accuracy while meeting AEC-Q100 Grade 0 ambient temp range (−40 to +150 °C). |
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 SMAJ43CA | Same DO-214AC (SMA) package; 43 V VWM, 76.7 V VC @ 8.2 A, but lower PPK (400 W) and no AEC-Q101 certification. | Not qualified for automotive underhood use; suitable only for commercial-grade industrial controls. | Select SMAJ43CA only if AEC-Q101 is not required and board space allows SMA footprint. |
| Vishay SMA6J43CA | DO-214AC (SMA) package; identical 43 V VWM and 76.7 V VC, but rated for 600 W PPK and AEC-Q101 qualified (Rev. 2022 spec). | Functionally equivalent but requires layout change from SMB to SMA pad geometry; same thermal derating profile. | Choose SMA6J43CA when sourcing flexibility is needed and PCB redesign for SMA is acceptable. |
Compared with SMBJ43CH, SMAJ43CA offers lower surge capability and no automotive qualification, limiting its use to non-critical systems; SMA6J43CA matches all electrical specs and qualification but demands package-level layout revision-making SMBJ43CH optimal for new SMB-based automotive designs requiring drop-in AEC-Q101 compliance.
Availability
SMBJ43CH is available at Aetrix Electronics and suitable for automotive ECU power rail protection, industrial CAN bus interfaces, LED lighting driver inputs, and smart sensor signal line protection requiring stable component supply across multi-year production cycles.
Supply support for SMBJ43CH 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 for automotive and industrial markets.
The SMBJH series was developed specifically to meet AEC-Q101 and ISO 7637-2 requirements for high-reliability transient suppression in 12 V/24 V automotive subsystems, emphasizing low clamping voltage, fast response, and robust thermal performance in SMB packaging.
FAQ
What does the "CH" suffix indicate in SMBJ43CH?
The "CH" suffix in SMBJ43CH denotes a bidirectional configuration, meaning the device provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMBJ43H), SMBJ43CH has no designated anode or cathode and functions identically regardless of polarity-critical for protecting AC-coupled or differential signal lines such as CAN or LIN buses. This is confirmed in the datasheet's "Devices for Bipolar Applications" section.
Is SMBJ43CH qualified for automotive underhood applications?
Yes, SMBJ43CH is AEC-Q101 qualified and explicitly tested per ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms-making it suitable for underhood ECUs, body control modules, and lighting systems exposed to load dump, jump-start, and switching transients. Its 150 °C maximum junction temperature and MSL Level 1 rating further validate its suitability for high-temperature, high-reliability automotive deployment.
What is the maximum clamping voltage of SMBJ43CH and under what test condition?
The maximum clamping voltage of SMBJ43CH is 76.7 V, measured at a peak pulse current (IPP) of 8.2 A using a 10/1000 µs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and represents the upper limit of voltage imposed on protected circuitry during worst-case transient events-enabling accurate overvoltage margining in 12 V/24 V system design.
How does SMBJ43CH compare to SMBJ43AH in terms of breakdown voltage?
SMBJ43CH has a breakdown voltage (VBR) range of 47.8–58.4 V at 1 mA test current, while SMBJ43AH (unidirectional, "AH" suffix) specifies 47.8–52.8 V. The wider VBR window of SMBJ43CH reflects its bidirectional symmetry and broader process tolerance, whereas SMBJ43AH's tighter range supports more precise unidirectional clamping in DC-biased applications like power supply inputs.
Can SMBJ43CH be used in place of a unidirectional TVS like SMBJ43H?
No-SMBJ43CH must not replace SMBJ43H in unidirectional applications without circuit review. While both share identical VWM (43 V) and VC (76.7 V), SMBJ43H conducts forward current below ~3.5 V (per VF spec), whereas SMBJ43CH exhibits symmetrical reverse conduction only. Using SMBJ43CH where forward conduction is expected (e.g., DC power rail clamping) may cause unintended current paths or failure to clamp correctly during positive surges.
SMBJ43CH 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 76.7V
- Current - Peak Pulse (10/1000µs):
- 8.2A
- 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)
SMBJ43CH FAQ
1.How can I place an order for SMBJ43CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43CH 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 SMBJ43CH reliable?
The price and inventory of SMBJ43CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ43CH is usually 5 days.
3.What payment methods are accepted for SMBJ43CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43CH?
SMBJ43CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43CH 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 SMBJ43CH?
For technical support, including SMBJ43CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43CH requirements.
6.How does Aetrix verify that SMBJ43CH is sourced from the original manufacturer or authorized distributors?
All SMBJ43CH 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 SMBJ43CH meets industry standards.
7.What is the process for return or replacement of SMBJ43CH?
All SMBJ43CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43CH, 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 SMBJ43CH part is unused and in its original packaging.
Return procedure for SMBJ43CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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