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Taiwan Semiconductor Corporation SMBJ22AH
- Part No.:
- SMBJ22AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ22AH.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,557
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Product details
Overview
SMBJ22AH 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), 24.4–26.9V breakdown voltage (VBR), 35.5V maximum clamping voltage (VC) at 17.7A peak pulse current (IPP), and AEC-Q101 qualification for under-hood electronics.
For engineers reviewing the SMBJ22AH datasheet, SMBJ22AH pinout, SMBJ22AH application, or SMBJ22AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, low leakage (<1µA at 22V), fast response (<1.0ps), and compatibility with automated SMT assembly in automotive powertrain and body control modules.
Technical Context
The SMBJ22AH operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve stable breakdown and low capacitance. Its thermal design supports 150°C max junction temperature and 10°C/W junction-to-case resistance, enabling reliable operation in high-temperature automotive environments.
It meets ISO 7637-2 immunity requirements for in-vehicle transients and complies with JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity-critical for reflow-soldered automotive PCBs exposed to thermal cycling and humidity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins; defines system-level standoff margin against normal bus ripple. |
| VBR (min/max) | 24.4 V / 26.9 V - Verified breakdown range at 1 mA test current; ensures predictable turn-on across process variation and temperature. |
| VC @ IPP | 35.5 V at 17.7 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress below 36 V in 12 V automotive systems. |
| PPK | 600 W - Peak pulse power rating per 10/1000 µs waveform; supports robust protection against load dump and inductive switching events. |
| ID @ VWM | <1 µA - Reverse leakage at rated stand-off; minimizes quiescent power loss in always-on vehicle subsystems. |
| TJ max | +150 °C - Maximum junction temperature; enables placement near heat sources like power relays or motor drivers without derating. |
| RθJA | 55 °C/W - Junction-to-ambient thermal resistance; informs board-level copper pour and airflow requirements for sustained surge duty cycles. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking on one end; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Weight: 0.090 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; forms clamping loop with cathode to protect upstream supply rail. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., LIN bus, sensor VCC); conducts avalanche current to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, lighting, and body electronics per stress test requirements. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure in automotive under-hood environments. |
| Fast response time <1.0 ps | Clamps ESD transients before sensitive analog front-ends or CAN transceivers experience damage or latch-up. |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Provides certified immunity against battery disconnect, alternator load dump, and inductive switch-off transients in 12 V systems. |
| Moisture sensitivity Level 1 | Eliminates bake-out requirement prior to reflow, reducing manufacturing cost and cycle time for high-volume automotive PCB assembly. |
Applications
| Automotive LIN Bus Protection | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Protects LIN transceiver ICs from ESD and coupled transients on 12 V supply lines in door modules and seat controllers. IC Role / Device Role: Unidirectional TVS placed between LIN VCC and ground, clamping surges before they reach the transceiver's internal LDO. Use Value: Limits clamped voltage to 35.5 V, ensuring LIN ICs with 40 V absolute max rating remain within safe operating area during ISO 7637-2 Pulse 2a. |
Use Scenario: Shields microcontroller power rails in engine management systems from load dump and alternator ripple. IC Role / Device Role: Primary surge clamp on main 12 V input, coordinated with upstream fuse and downstream ceramic decoupling. Use Value: Withstands 600 W peak power and 17.7 A surge current, maintaining <1 µA leakage to avoid battery drain in sleep mode. |
| LED Headlamp Driver Protection | Body Control Module (BCM) Sensor Interface |
Use Scenario: Guards constant-current LED driver ICs against inductive kickback from relay-controlled headlamp circuits. IC Role / Device Role: TVS connected across driver output to absorb flyback energy when relay opens. Use Value: Fast <1.0 ps response prevents voltage overshoot beyond 35.5 V, avoiding gate oxide damage in MOSFET-based LED drivers. |
Use Scenario: Protects analog sensor inputs (e.g., ambient light, rain sensor) from EFT and cable discharge events. IC Role / Device Role: Low-capacitance unidirectional clamp on sensor VDD line, minimizing signal distortion. Use Value: 22 V VWM matches typical 24 V sensor supply rails while providing 13.5 V margin above nominal, enabling precise overvoltage thresholding. |
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 SMAJ22A | Same DO-214AC (SMA) package; 35.5 V VC @ 17.7 A but higher RθJA (65°C/W); no AEC-Q101 certification. | Not qualified for automotive under-hood use; suitable for industrial controls where temperature derating is acceptable. | Select only if AEC-Q101 is not required and board layout allows SMA footprint. |
| ON Semiconductor SMCJ22A | DO-214AB (SMC) package; 35.5 V VC @ 17.7 A; AEC-Q101 qualified; higher PPK (1500 W) but larger footprint and 0.25 g weight. | Overqualified for 600 W needs; used where higher surge margin or legacy SMC layout exists. | Choose when existing PCB uses SMC pads or system requires >600 W headroom for extended surge duration. |
Compared with SMAJ22A and SMCJ22A, the SMBJ22AH delivers optimal balance of AEC-Q101 compliance, 600 W surge capability, and compact DO-214AA footprint-making it the preferred choice for space-constrained, thermally demanding automotive modules requiring validated reliability.
Availability
SMBJ22AH is available at Aetrix Electronics and suitable for automotive lighting systems, engine control units, body control modules, and LIN bus interfaces requiring stable component supply across multi-year production cycles.
Supply support for SMBJ22AH 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 protection in 12 V and 24 V automotive electrical systems, emphasizing low clamping voltage, high surge robustness, and SMT manufacturability.
FAQ
What is the polarity configuration of SMBJ22AH?
The SMBJ22AH is a unidirectional TVS diode, with cathode marked by a band on the DO-214AA package. It conducts only during reverse overvoltage events-protecting positive supply rails by shunting surge current to ground. This configuration ensures zero forward conduction during normal operation, preserving system efficiency and preventing unintended biasing of downstream circuitry. The SMBJ22AH must be oriented with cathode toward the protected line and anode to ground.
Does SMBJ22AH meet automotive EMC standards?
Yes, the SMBJ22AH is explicitly validated to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements for transient immunity in 12 V automotive systems. Its 35.5 V clamping voltage at 17.7 A and sub-1.0 ps response time ensure compliance with these waveforms without external filtering. It is also AEC-Q101 qualified, confirming reliability under temperature cycling, humidity, and mechanical stress relevant to automotive EMC validation.
How does SMBJ22AH differ from SMBJ22H?
The SMBJ22AH has tighter breakdown voltage tolerance (24.4–26.9 V) versus SMBJ22H (24.4–29.8 V), resulting in more consistent clamping behavior across production lots. Both share identical VWM (22 V), VC (35.5 V / 39.4 V), and PPK (600 W), but the "A" suffix denotes enhanced VBR uniformity-critical for designs requiring precise overvoltage thresholds in safety-critical automotive functions. SMBJ22AH is recommended where VBR consistency directly impacts fault detection accuracy.
What is the maximum surge current SMBJ22AH can handle?
The SMBJ22AH supports a maximum peak impulse current (IPP) of 17.7 A under the standard 10/1000 µs waveform, corresponding to its 600 W peak pulse power rating. This value is measured at 25°C and derates linearly above that ambient temperature per the published pulse derating curve. At 85°C ambient, the usable IPP drops to approximately 12.5 A-still sufficient for ISO 7637-2 Pulse 2a (100 A/50 ms) when combined with appropriate series impedance.
Is SMBJ22AH compatible with lead-free reflow processes?
Yes, the SMBJ22AH uses matte tin-plated leads compliant with J-STD-002 solderability testing and is rated for lead-free reflow profiles up to 260°C peak temperature. Its moisture sensitivity level is J-STD-020 Level 1, meaning it can be stored indefinitely at ambient conditions without baking prior to assembly. The DO-214AA package also meets UL 94V-0 flammability requirements, supporting RoHS and halogen-free compliance in automotive PCB manufacturing.
SMBJ22AH 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:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 17.7A
- 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)
SMBJ22AH FAQ
1.How can I place an order for SMBJ22AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ22AH 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 SMBJ22AH reliable?
The price and inventory of SMBJ22AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ22AH is usually 5 days.
3.What payment methods are accepted for SMBJ22AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ22AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ22AH?
SMBJ22AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ22AH 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 SMBJ22AH?
For technical support, including SMBJ22AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ22AH requirements.
6.How does Aetrix verify that SMBJ22AH is sourced from the original manufacturer or authorized distributors?
All SMBJ22AH 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 SMBJ22AH meets industry standards.
7.What is the process for return or replacement of SMBJ22AH?
All SMBJ22AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ22AH, 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 SMBJ22AH part is unused and in its original packaging.
Return procedure for SMBJ22AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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