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Taiwan Semiconductor Corporation SMBJ20H
- Part No.:
- SMBJ20H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ20H.pdf
- Description:
- 600W, 24.7V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,547
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Product details
Overview
SMBJ20H from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in automotive and industrial power rails. It features a 20 V working stand-off voltage (VWM), 22.2–27.1 V breakdown voltage (VBR), 35.8 V maximum clamping voltage (VC) at 17.6 A peak pulse current, and 600 W peak pulse power rating with <1.0 ps response time - deployed to safeguard CAN, LIN, and 12 V sensor interfaces against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ20H datasheet, SMBJ20H pinout, SMBJ20H application, or SMBJ20H equivalent, key selection criteria include clamping performance under 10/1000 µs surge, unidirectional polarity marking, DO-214AA (SMB) package thermal resistance (RθJA = 55 °C/W), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
The SMBJ20H operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast sub-picosecond response and low leakage (<1 µA at 20 V). Its clamping behavior follows IEEE C62.35 standards, with defined 10/1000 µs waveform compliance and derating above 25 °C per Fig. 2.
Thermally, it sustains 150 °C maximum junction temperature and delivers RθJC = 10 °C/W and RθJA = 55 °C/W - enabling direct PCB copper pour integration for automotive body control modules and power supply input stages where transient energy absorption must coexist with long-term thermal stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous DC or RMS voltage the device blocks without conduction; sets operating margin for 12 V automotive systems. |
| VBR min/max | 22.2–27.1 V @ 1 mA - Confirmed avalanche onset range; ensures reliable triggering before downstream IC damage thresholds. |
| VC @ IPP | 35.8 V @ 17.6 A - Clamped voltage during 10/1000 µs surge; limits stress on protected 24 V logic or MCU I/O pins. |
| PPK | 600 W - Peak non-repetitive surge power handling; supports ISO 7637-2 Pulse 1 (inductive load dump) immunity. |
| IR @ VWM | <1 µA - Ultra-low leakage preserves battery life in always-on automotive modules like door ECUs. |
| TJ max | +150 °C - Enables under-hood deployment in engine control units and lighting drivers without thermal derating penalties. |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, single-die unidirectional configuration with cathode band marking. Matte tin-plated leads meet J-STD-002 solderability; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected circuit | Connected to line/rail being protected (e.g., 12 V battery feed); conducts surge current to ground when clamping. |
| Cathode | Ground reference terminal | Connected to system ground plane; polarity marking (band) prevents reverse installation in unidirectional layout. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including temperature cycling, humidity bias, and mechanical shock per stress test requirements. |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to environmental contamination in under-hood environments. |
| Clamping voltage ≤35.8 V | Keeps protected 24 V microcontroller I/O within safe absolute maximum ratings during 10/1000 µs surges. |
| Response time <1.0 ps | Activates faster than most semiconductor switching events, preventing ESD-induced latch-up in CAN transceivers. |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Complies with full suite of automotive transient immunity standards for power line protection in OEM designs. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protecting 12 V power rail and LIN bus lines in door module ECUs exposed to load dump and ESD. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and local regulator input to clamp transients before LDO or MCU power pins. Use Value: Prevents permanent damage to 3.3 V/5 V logic from ISO 7637-2 Pulse 1 (−120 V, 50 ms) and Pulse 2b (−100 V, 50 ms) events. |
Use Scenario: Safeguarding 24 V digital input channels on programmable logic controller (PLC) I/O cards connected to field sensors. IC Role / Device Role / Timing Role: Front-end surge limiter on dry-contact inputs subject to inductive kickback from solenoid or relay coils. Use Value: Limits clamped voltage to ≤35.8 V, ensuring input Schmitt triggers and optocouplers remain within safe operating area during 10/1000 µs surges up to 17.6 A. |
| LED Headlamp Driver Power Stage | Automotive CAN FD Transceiver Interface |
Use Scenario: Shielding buck converter input stage in adaptive LED headlamps from alternator ripple and load dump. IC Role / Device Role / Timing Role: Primary surge absorber on 12 V input rail upstream of DC-DC controller ICs and gate drivers. Use Value: Absorbs 600 W peak pulses without degradation, maintaining stable 12 V rail for PWM dimming circuits during cold-crank conditions. |
Use Scenario: Protecting CAN FD transceiver VCC and data lines against ESD and coupled transients in vehicle infotainment gateways. IC Role / Device Role / Timing Role: Secondary-level TVS on transceiver power pin, coordinated with primary common-mode choke and data-line TVS. Use Value: Sub-1 ps response ensures clamping occurs before CAN FD bit timing (≤5 ns edge rates) is disrupted, preserving signal 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 |
|---|---|---|---|
| SMBJ20AH | Narrower VBR range (22.2–24.5 V vs. 22.2–27.1 V); lower clamping voltage (32.4 V @ 19.4 A). | Better suited for tighter voltage-margin systems (e.g., 24 V rail with <5 V overhead) where lower VC reduces stress on downstream regulators. | Select SMBJ20AH when clamping voltage budget is constrained; SMBJ20H offers wider VBR tolerance for cost-sensitive production screening. |
| SMCJ20H | Larger DO-214AB (SMC) package; higher PPK (1500 W); same VWM/VBR/VC specs but improved thermal mass. | Preferred for high-reliability industrial motor drives where sustained surge repetition or elevated ambient temperatures exceed SMBJ20H's RθJA limit. | Choose SMCJ20H only if board space allows larger footprint and thermal design requires >600 W single-pulse capability. |
Compared with SMBJ20AH and SMCJ20H, the SMBJ20H balances AEC-Q101 compliance, DO-214AA compactness, and 600 W surge capacity - making it optimal for space-constrained automotive modules requiring proven qualification without over-engineering thermal or voltage margins.
Availability
SMBJ20H is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, and LED driver power stages requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMBJ20H 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, MOSFETs, and power management devices.
The SMBJH series was developed specifically for AEC-Q101-compliant automotive transient protection, targeting 12 V/24 V power rails, sensor interfaces, and communication buses where fast clamping, low leakage, and robust thermal performance are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ20H under standard 10/1000 µs surge conditions?
The SMBJ20H has a maximum clamping voltage (VC) of 35.8 V at 17.6 A peak pulse current (IPP), measured using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with 24 V logic interfaces and automotive MCU power rails.
Is SMBJ20H suitable for bidirectional transient protection applications?
No, SMBJ20H is a unidirectional TVS diode and must not be used for bidirectional protection. For bipolar operation, select SMBJ20CH or SMBJ20CAH - which feature symmetrical breakdown in both directions and are explicitly rated for AC line or data bus protection. Using SMBJ20H in reverse-biased configurations risks catastrophic failure due to lack of reverse avalanche capability.
Does SMBJ20H meet automotive qualification standards?
Yes, SMBJ20H is AEC-Q101 qualified and tested per the full stress test schedule including temperature cycling, high-temperature operating life, and ESD robustness. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements - confirming suitability for front-end protection in automotive ECUs, lighting systems, and infotainment gateways.
What is the thermal resistance from junction to ambient for SMBJ20H?
The SMBJ20H has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W under standard JEDEC PCB mounting conditions (2s2p copper). This value assumes minimal copper pour; actual thermal performance improves significantly with dedicated thermal pads and internal layer copper planes - essential for sustaining repeated surges in under-hood applications where ambient temperatures reach 125 °C.
How does SMBJ20H differ from SMBJ20AH in practical circuit design?
SMBJ20H has a wider breakdown voltage range (22.2–27.1 V) versus SMBJ20AH (22.2–24.5 V), resulting in higher worst-case clamping voltage (35.8 V vs. 32.4 V). In practice, SMBJ20H offers greater manufacturing yield flexibility, while SMBJ20AH provides tighter voltage control for systems with narrow overvoltage margins - such as 24 V supplies feeding low-dropout regulators with limited headroom.
SMBJ20H 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 17.6A
- 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)
SMBJ20H FAQ
1.How can I place an order for SMBJ20H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ20H 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 SMBJ20H reliable?
The price and inventory of SMBJ20H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ20H is usually 5 days.
3.What payment methods are accepted for SMBJ20H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ20H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ20H?
SMBJ20H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ20H 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 SMBJ20H?
For technical support, including SMBJ20H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ20H requirements.
6.How does Aetrix verify that SMBJ20H is sourced from the original manufacturer or authorized distributors?
All SMBJ20H 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 SMBJ20H meets industry standards.
7.What is the process for return or replacement of SMBJ20H?
All SMBJ20H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ20H, 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 SMBJ20H part is unused and in its original packaging.
Return procedure for SMBJ20H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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