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Taiwan Semiconductor Corporation SMBJ22CA
- Part No.:
- SMBJ22CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ22CA.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,457
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Product details
Overview
SMBJ22CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in power rails and signal lines. It features a 22 V working stand-off voltage (VWM), 39.4 V maximum clamping voltage (VC) at 15 A peak pulse current, and 600 W peak pulse power rating with <1.0 ps response time. It is used in automotive infotainment power inputs to suppress ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ22CA datasheet, SMBJ22CA pinout, SMBJ22CA application, or SMBJ22CA equivalent, key selection criteria include bidirectional clamping capability, DO-214AA (SMB) package compatibility, 22 V stand-off voltage tolerance, and compliance with automotive transient immunity standards.
Technical Context
The SMBJ22CA is a single-die, bidirectional TVS diode optimized for fast transient suppression in DC power and low-speed signal paths. Its glass-passivated junction ensures stable breakdown behavior, while its 10/1000 µs waveform-rated 600 W peak pulse power supports robust protection against repetitive and non-repetitive surges.
It operates across –55 °C to +150 °C junction temperature range and meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements - enabling reliable use in reflow-soldered automotive and industrial PCB assemblies without special handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 24.4 V / 29.8 V @ 1 mA - Ensures consistent breakdown initiation across production lots |
| VC @ IPP | 39.4 V @ 15 A - Limits downstream voltage stress during 10/1000 µs surge events |
| PPK | 600 W - Sustains high-energy transients per ISO 7637-2 without failure |
| ID @ VWM | <1 µA - Negligible leakage at rated stand-off, preserving system quiescent current |
| TJ max | +150 °C - Enables operation in under-hood automotive environments |
| RθJA | 55 °C/W - Defines thermal derating above 25 °C ambient for sustained power dissipation |
Pinout & Package
Package: DO-214AA (SMB), surface-mount, bi-directional configuration with cathode band omitted (symmetrical terminals).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (bidirectional) | Transient current path | Either terminal accepts surge current in either polarity - no polarity marking required |
| Case (exposed pad not present) | Mechanical mounting only | No electrical connection; thermally isolated plastic body limits heat conduction |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable breakdown voltage and long-term reliability under thermal cycling |
| <1.0 ps response time | Clamps ESD events before sensitive ICs experience overvoltage damage |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for automotive battery-line surge immunity without external filtering |
| RoHS & halogen-free (IEC 61249-2-21) | Complies with global environmental regulations and enables lead-free reflow assembly |
| J-STD-020 Level 1 moisture sensitivity | Allows standard SMT handling and reflow without baking or dry-pack requirements |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery line in vehicle infotainment head unit exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional TVS clamping device placed upstream of DC-DC converter input. Use Value: Limits transient voltage to ≤39.4 V during ISO 7637-2 Pulse 2b (inductive switch-off), preventing regulator latch-up or MOSFET gate oxide failure. | Use Scenario: 24 V analog sensor signal line in PLC I/O module subject to field wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Low-capacitance TVS shunt protector on differential pair before instrumentation amplifier. Use Value: Clamps ±15 kV contact ESD per IEC 61000-4-2 without distorting mV-level sensor signals due to sub-100 pF junction capacitance. |
| LED Driver Output Protection | USB-C Power Delivery Line Protection |
Use Scenario: Constant-current LED string driver output in outdoor signage subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-side TVS across LED load terminals to absorb back-EMF and line transients. Use Value: Withstands 600 W peak pulse energy and maintains clamping below 40 V, protecting LED driver IC and series-connected LEDs from overvoltage failure. | Use Scenario: VBUS line in USB-C receptacle on portable medical device exposed to accidental 20 V adapter misconnection and ESD. IC Role / Device Role / Timing Role: Bidirectional TVS between VBUS and GND to clamp both positive and negative overvoltage events. Use Value: 22 V VWM allows normal 5–20 V PD operation while clamping 39.4 V at 15 A, safeguarding USB PD controller and port power switches. |
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 SMAJ22CA | Same DO-214AC (SMA) package; 39.4 V VC @ 15 A; slightly higher RθJA (65 °C/W) | Lower power density due to larger thermal resistance - requires more board area for same thermal margin | Select when existing layout uses SMA footprint and thermal derating budget permits |
| ON Semiconductor 1.5SMC22CA | DO-214AB (SMC) package; 39.4 V VC @ 15 A; 1.5 kW peak power rating | Higher PPK supports longer surge durations but occupies ~2× PCB area vs. SMB | Choose for systems requiring extended surge hold time beyond 10/1000 µs, where space allows |
Compared with SMBJ22CA, SMAJ22CA offers identical electrical clamping but demands greater thermal management due to its SMA package, while 1.5SMC22CA provides higher surge energy capacity at the cost of significantly larger board footprint - making SMBJ22CA optimal for space-constrained automotive and industrial modules needing balanced performance and size.
Availability
SMBJ22CA is available at Aetrix Electronics and suitable for automotive infotainment power rail protection, industrial sensor interface hardening, and LED driver output surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMBJ22CA 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 Company (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMBJ Series was developed specifically for surface-mount surge protection in space-constrained, high-reliability applications - emphasizing fast response, AEC-Q200 readiness, and compatibility with automated SMT assembly.
FAQ
What is the maximum clamping voltage of SMBJ22CA at its rated peak pulse current?
The SMBJ22CA has a maximum clamping voltage (VC) of 39.4 V at 15 A peak pulse current (IPP), measured under the standardized 10/1000 µs double-exponential surge waveform. This value ensures downstream circuitry remains within safe operating voltage limits during transient events. The SMBJ22CA's clamping performance is verified per ANSI/IEEE C62.35 and forms the basis for system-level surge immunity design.
Is SMBJ22CA unidirectional or bidirectional, and how is polarity indicated?
SMBJ22CA is a bidirectional TVS diode, meaning it provides symmetrical clamping for both positive and negative transients - confirmed by the "CA" suffix per TSC documentation. Unlike unidirectional variants (e.g., SMBJ22A), it has no cathode band marking and no polarity dependency in circuit placement. This makes SMBJ22CA ideal for AC-coupled lines or DC rails where reverse-voltage transients are possible.
Does SMBJ22CA meet automotive transient immunity standards?
Yes, SMBJ22CA meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements - explicitly stated in the TSC datasheet. Its 600 W peak pulse power rating, fast <1.0 ps response, and 39.4 V clamping voltage enable direct integration into automotive power distribution networks without supplemental filtering. The SMBJ22CA is widely deployed in AEC-Q200-compliant modules for infotainment and body control units.
What is the junction-to-ambient thermal resistance (RθJA) of SMBJ22CA, and why does it matter?
The SMBJ22CA has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W, measured on standard FR-4 PCB with minimum copper pad area. This parameter determines how much the junction temperature rises above ambient under sustained power dissipation - critical for derating during repetitive surge events or elevated ambient conditions. For example, at 1 W steady-state dissipation, junction temperature increases by 55 °C above ambient, directly impacting long-term reliability and surge endurance.
Can SMBJ22CA be used in place of SMBJ22A in a design?
No - SMBJ22CA and SMBJ22A are functionally distinct: SMBJ22CA is bidirectional (clamps both polarities), while SMBJ22A is unidirectional (cathode-marked, clamps only reverse polarity). Substituting SMBJ22CA for SMBJ22A may cause unintended forward conduction or fail to protect against positive transients in unidirectional configurations. Always verify circuit topology and transient polarity requirements before selecting between "A" (unidirectional) and "CA" (bidirectional) variants of SMBJ22CA.
SMBJ22CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 16.9A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ22CA FAQ
1.How can I place an order for SMBJ22CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ22CA 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 SMBJ22CA reliable?
The price and inventory of SMBJ22CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ22CA is usually 5 days.
3.What payment methods are accepted for SMBJ22CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ22CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ22CA?
SMBJ22CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ22CA 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 SMBJ22CA?
For technical support, including SMBJ22CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ22CA requirements.
6.How does Aetrix verify that SMBJ22CA is sourced from the original manufacturer or authorized distributors?
All SMBJ22CA 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 SMBJ22CA meets industry standards.
7.What is the process for return or replacement of SMBJ22CA?
All SMBJ22CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ22CA, 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 SMBJ22CA part is unused and in its original packaging.
Return procedure for SMBJ22CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ22CA Tags
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