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Taiwan Semiconductor Corporation SMBJ22H
- Part No.:
- SMBJ22H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ22H.pdf
- Description:
- 600W, 27.1V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,546
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Product details
Overview
SMBJ22H from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for automotive-grade ESD and surge protection. It features a 22V working stand-off voltage (VWM), 24.4–29.8V breakdown voltage (VBR @ 1mA), 39.4V maximum clamping voltage (VC @ 15A), <1μA leakage at 22V, and AEC-Q101 qualification for under-hood electronics.
For engineers reviewing the SMBJ22H datasheet, SMBJ22H pinout, SMBJ22H application, or SMBJ22H equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, thermal resistance (RθJA = 55°C/W), unidirectional polarity marking, and compatibility with automated SMT placement on 12V automotive power rails.
Technical Context
The SMBJ22H operates as a unidirectional avalanche diode, conducting only during reverse overvoltage events while blocking forward current up to 3.5V at 50A. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1μA at VWM), critical for low-power sensor interfaces.
It delivers 600W peak pulse power (10/1000µs waveform) with sub-1ps response time and meets ISO 7637-2 immunity requirements for automotive electronics. Junction temperature range is –55°C to +150°C, supporting under-hood deployment without derating below 25°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; sets threshold for 12V automotive system protection. |
| VBR min/max | 24.4 V / 29.8 V @ 1 mA - Confirmed breakdown range ensures reliable turn-on margin above VWM without premature conduction. |
| VC @ IPP | 39.4 V @ 15 A - Clamping voltage limits downstream IC stress during 10/1000µs transients; enables robust protection of 3.3V/5V logic. |
| PPK | 600 W - Peak pulse power rating defines survivability against high-energy surges like load dump or inductive kick. |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery life in always-on automotive modules and avoids false triggers in high-impedance circuits. |
| RθJA | 55 °C/W - Thermal resistance determines required PCB copper area for sustained 3W steady-state dissipation without exceeding TJ max. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking for unidirectional polarity. Matte tin-plated leads comply with J-STD-002 solderability and JESD 201 Class 2 whisker resistance. Moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path terminal | Connected to system ground or low-side return; must be routed with low-inductance trace for fast transient response. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V rail); cathode band identifies polarity-critical for correct unidirectional installation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors per stress test requirements. |
| Glass passivated junction | Ensures stable VBR over lifetime and temperature, minimizing drift in harsh environments (–40°C to +125°C operating range). |
| Fast response time <1 ps | Clamps transients before sensitive ICs experience damaging voltage overshoot-essential for CAN/LIN bus and microcontroller I/O protection. |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Guarantees immunity to real-world automotive transients including battery disconnect, alternator load dump, and inductive switching noise. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive, enabling use in global automotive supply chains without material compliance risk. |
Applications
| Automotive Power Rail Protection | ECU Input/Output Protection |
|---|---|
Use Scenario: Protecting 12V battery-fed power inputs in engine control units against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp reverse surges before they reach DC-DC converters or LDOs. Use Value: Limits peak voltage to ≤39.4V during 15A transients, preventing damage to 40V-rated input stages and ensuring ASIL-B functional safety compliance. |
Use Scenario: Safeguarding LIN bus transceiver pins and sensor analog inputs from ESD and coupled noise in door modules. IC Role / Device Role / Timing Role: Local clamping device mounted adjacent to connector entry points to shunt fast transients before signal conditioning circuitry. Use Value: Sub-1ps response and <1μA leakage preserve signal integrity and standby current budget while meeting ISO 10605 ±8kV contact discharge requirements. |
| LED Lighting Driver Protection | Industrial Sensor Interface Protection |
Use Scenario: Shielding constant-current LED driver ICs from inductive kickback when driving solenoid-based headlamp actuators. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to absorb energy from coil de-energization pulses. Use Value: 600W peak power rating handles repetitive 10/1000µs pulses without degradation, extending driver IC lifetime in cyclic lighting systems. |
Use Scenario: Securing 4–20mA loop-powered pressure/temperature sensors exposed to field wiring surges in factory automation. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; SMBJ22H serves as unidirectional clamp on supply side of loop transmitter. Use Value: 22V VWM aligns with 24V industrial supply rails, while 39.4V VC prevents latch-up in precision op-amp front-ends during 1kV surge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ22A | Same DO-214AC (SMA) package; 22V VWM, 35.5V VC @ 17.7A; RθJA = 65°C/W; no AEC-Q101 qualification. | Lower clamping voltage but higher thermal resistance; suitable for non-automotive industrial use where qualification is not mandated. | Select SMAJ22A only if AEC-Q101 is unnecessary and PCB layout allows SMA footprint; not drop-in due to different package outline. |
| ON Semiconductor 1.5SMC22A | DO-214AB (SMC) package; 22V VWM, 35.5V VC @ 17.7A; 1500W PPK; RθJA = 35°C/W; AEC-Q101 qualified. | Higher power rating and better thermal performance, but larger footprint requires board redesign; suited for high-reliability 24V systems. | Choose 1.5SMC22A when surge energy exceeds 600W or thermal management is constrained; not pin-compatible with SMBJ22H. |
Compared with SMAJ22A and 1.5SMC22A, the SMBJ22H uniquely balances AEC-Q101 compliance, DO-214AA (SMB) compactness, and 600W capability-making it optimal for space-constrained automotive modules where qualification and footprint are non-negotiable.
Availability
SMBJ22H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and LED lighting systems requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant surge protection.
Supply support for SMBJ22H 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 12V/24V automotive subsystems, emphasizing reliability, low leakage, and standardized DO-214AA packaging for high-volume SMT assembly.
FAQ
What is the clamping voltage of SMBJ22H and how does it protect downstream components?
The SMBJ22H has a maximum clamping voltage (VC) of 39.4 V at 15 A (10/1000 µs waveform). This means that during a surge event, the device limits the voltage seen by downstream ICs to ≤39.4 V, well below typical 40 V absolute maximum ratings of automotive power management ICs. Its fast <1 ps response ensures clamping occurs before transient energy damages sensitive circuitry, making SMBJ22H effective for protecting CAN transceivers, microcontrollers, and sensor front-ends.
Is SMBJ22H suitable for bidirectional transient protection?
No, SMBJ22H is a unidirectional TVS diode intended for DC circuits with defined polarity, such as 12 V automotive power rails. For bidirectional protection (e.g., AC lines or data buses), the SMBJ22AH variant or dedicated bipolar TVS devices like SMBJ22CAH must be used. The SMBJ22H cathode band marking indicates polarity and must be oriented correctly-reverse installation will prevent proper clamping.
Does SMBJ22H meet automotive qualification standards?
Yes, SMBJ22H is AEC-Q101 qualified and tested per the full stress test schedule for discrete semiconductors, including temperature cycling, humidity bias HAST, and mechanical shock. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b for electrical transient immunity-making it suitable for engine control, body electronics, and ADAS applications where automotive-grade reliability is mandatory.
What is the thermal performance of SMBJ22H and how does it affect PCB layout?
SMBJ22H has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and junction-to-case (RθJC) of 10°C/W. To maintain TJ ≤ 150°C at full 3 W steady-state dissipation, the PCB must provide ≥1.5 cm² of 1 oz copper connected to both terminals. Layout should minimize trace length, use thermal vias under the cathode/anode pads, and avoid enclosing the device in tight enclosures-ensuring SMBJ22H remains within safe operating limits during prolonged surge exposure.
How does SMBJ22H compare to lower-voltage variants like SMBJ12H in terms of application scope?
SMBJ22H targets 12 V nominal systems where VWM = 22 V provides adequate margin above battery voltage (13.5 V typical running, up to 16 V during charging), while SMBJ12H (VWM = 12 V) is reserved for 5 V or low-voltage logic rails. Using SMBJ12H on a 12 V rail would cause premature conduction and excessive leakage; SMBJ22H's higher VWM avoids false triggering yet still clamps effectively at 39.4 V-making it the correct choice for main power rail protection in automotive ECUs.
SMBJ22H 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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 39.4V
- Current - Peak Pulse (10/1000µs):
- 15A
- 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)
SMBJ22H FAQ
1.How can I place an order for SMBJ22H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ22H 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 SMBJ22H reliable?
The price and inventory of SMBJ22H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ22H is usually 5 days.
3.What payment methods are accepted for SMBJ22H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ22H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ22H?
SMBJ22H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ22H 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 SMBJ22H?
For technical support, including SMBJ22H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ22H requirements.
6.How does Aetrix verify that SMBJ22H is sourced from the original manufacturer or authorized distributors?
All SMBJ22H 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 SMBJ22H meets industry standards.
7.What is the process for return or replacement of SMBJ22H?
All SMBJ22H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ22H, 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 SMBJ22H part is unused and in its original packaging.
Return procedure for SMBJ22H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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