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Diodes Incorporated SMAJ22CA-13-F
- Part No.:
- SMAJ22CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ22CA-13-F.pdf
- Description:
- TVS DIODE 22VWM 35.5VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,711
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Product details
Overview
SMAJ22CA-13-F from Diodes Incorporated is a bidirectional 400W transient voltage suppressor (TVS) diode in SMA package, designed for overvoltage protection of sensitive electronics. It features a 22V reverse standoff voltage (VRWM), 24.4–26.9V breakdown voltage (VBR), 35.5V max clamping voltage (VC) at 11.2A peak pulse current (IPP), and operates from –55°C to +150°C - used in automotive power line surge suppression and industrial I/O interface protection.
For engineers reviewing the SMAJ22CA-13-F datasheet, SMAJ22CA-13-F pinout, SMAJ22CA-13-F application, or SMAJ22CA-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, unidirectional vs. bidirectional polarity requirements, peak pulse power derating above +25°C, and compatibility with IPC-7351B SMA footprint standards.
Technical Context
This bidirectional TVS diode uses glass-passivated junction construction to achieve fast response time (<1 ps) and stable clamping under 8.3 ms half-sine surge transients. Its symmetrical breakdown behavior enables protection of AC-coupled or differential signal lines without polarity constraints.
The device complies with IEC 61000-4-2 (ESD) and IEC 61000-4-4 (EFT) immunity standards when integrated with appropriate PCB layout practices. Thermal performance is defined by steady-state power dissipation of 1.0 W at TL = +75°C and pulse derating per Fig. 1 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - sustains single 8.3 ms surge events without failure; critical for ISO 7637-2 pulse 1/2a/5a compliance. |
| Reverse Standoff Voltage | 22 V - maximum continuous DC or RMS voltage before significant leakage; sets upper limit for protected circuit operating voltage. |
| Clamping Voltage | 35.5 V @ 11.2 A - peak voltage seen by downstream circuit during worst-case surge; must remain below protected IC absolute maximum rating. |
| Breakdown Voltage | 24.4–26.9 V @ 1.0 mA - onset of avalanche conduction; defines transition from high-impedance to low-impedance clamping state. |
| Leakage Current | 5.0 µA @ 22 V - ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| Operating Temperature | –55°C to +150°C - supports under-hood automotive, industrial motor control, and outdoor telecom applications. |
Pinout & Package
Package: SMA (Surface Mount Axial), molded plastic case per UL 94V-0, 0.064 g weight, cathode band omitted (bidirectional configuration).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Identical terminals - no polarity; conducts in both directions once VBR is exceeded in either polarity. |
Key Features
| Feature | Design Value |
|---|---|
| 400W peak pulse power | Enables robust protection against ISO 7637-2 Pulse 5a (load dump) surges up to 100 V/100 ms in 12 V systems. |
| Glass-passivated die | Improves long-term reliability and moisture resistance versus epoxy-passivated alternatives; reduces parameter drift over temperature cycling. |
| Bidirectional symmetry | Eliminates need for polarity-aware placement on PCB; simplifies layout for AC lines, RS-485, CAN FD, or Ethernet PHY interfaces. |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU with <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - suitable for automotive PPAP and industrial green procurement programs. |
Applications
| Automotive Power Line Protection | Industrial RS-485 Interface |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and jump-start transients per ISO 7637-2. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between power rail and ground, responding within picoseconds to divert surge energy. Use Value: Limits voltage to ≤35.5 V during 100 V/100 ms load dump event, preventing damage to MCU, CAN transceivers, and analog front-ends. |
Use Scenario: Shielding RS-485 transceivers in factory automation networks from ESD and cable-induced surges. IC Role / Device Role / Timing Role: Differential-line TVS across A/B bus pins, suppressing common-mode and differential-mode transients simultaneously. Use Value: Maintains signal integrity by clamping transients before they exceed ±15 V common-mode range of ISO 8482-compliant transceivers. |
| Smart Meter Communication Port | Outdoor PoE-Powered Camera |
Use Scenario: Securing HPLC (high-speed power line communication) couplers in utility smart meters exposed to grid switching noise. IC Role / Device Role / Timing Role: Low-capacitance (≈25 pF) bidirectional clamp on signal coupling path, minimizing distortion of 1–30 MHz carrier signals. Use Value: Provides <100 ns response with <35.5 V clamping, preserving HPLC modulation fidelity while meeting IEC 61000-4-5 Level 3 surge immunity. |
Use Scenario: Safeguarding IEEE 802.3af/at PoE-powered IP cameras installed on building exteriors subject to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on PSE-side data pair inputs, coordinated with secondary GDT or MOV stages. Use Value: Absorbs up to 400 W of coupled surge energy before secondary protection triggers, extending system MTBF in harsh environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22CA from Littelfuse (part # SMAJ22CA) | Same VRWM (22 V), VC (35.5 V), IPP (11.2 A); identical SMA package; slightly higher IR (10 µA vs. 5 µA). | No functional difference in surge protection; same PCB footprint and thermal profile. | Preferred where dual-source qualification is required for automotive Tier-1 supply chain continuity. |
| P6SMB22CA from Vishay (part # P6SMB22CA) | Same VRWM and VC, but rated for 600 W peak pulse power; larger SMB package (4.6 × 3.9 mm vs. SMA 4.6 × 2.9 mm). | Higher surge margin but requires PCB redesign; not drop-in due to larger body and different pad layout. | Select only when system-level testing confirms need for >400 W surge handling and board space permits SMB footprint. |
Compared with SMAJ22CA-13-F, the Littelfuse alternative offers identical electrical performance and mechanical fit for seamless second-source use, while the Vishay part trades compactness for higher surge capacity - requiring layout revision and thermal reassessment.
Availability
SMAJ22CA-13-F is available at Aetrix Electronics and suitable for automotive ECU design, industrial RS-485 network deployment, and smart meter production requiring stable component supply and full traceability through J-STD-020 Level 1 moisture sensitivity compliance.
Supply support for SMAJ22CA-13-F 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions, with manufacturing certified to IATF 16949 and product qualification to AEC-Q101 for automotive-grade components.
The SMAJ series targets high-reliability transient suppression in automotive, industrial, and communications infrastructure - engineered for rapid response, stable clamping, and long-term parametric stability under thermal cycling.
FAQ
What is the meaning of the "C" in SMAJ22CA-13-F?
The "C" suffix denotes a bidirectional configuration, meaning the device provides symmetrical clamping for both positive and negative transients. Unlike unidirectional variants (e.g., SMAJ22A), it has no cathode band and functions identically regardless of terminal orientation - essential for AC-coupled or differential signal lines like RS-485 or CAN.
Can SMAJ22CA-13-F be used in place of a unidirectional TVS in a DC power rail?
Yes, but with design trade-offs: bidirectional operation introduces ~0.7 V forward voltage drop in each direction during normal conduction, which may affect low-voltage monitoring circuits. For pure DC rails, unidirectional devices offer tighter leakage control and lower forward voltage - verify that 5.0 µA leakage at 22 V meets system standby current budget.
How does the SMA package compare to SMB in surge handling capability?
The SMA package has lower thermal mass and smaller pad area than SMB, limiting its ability to dissipate heat during repetitive surges. While both support 400 W peak pulse power for single events, the SMA's steady-state power rating remains 1.0 W at TL = +75°C - identical to SMB - but its pulse derating curve (Fig. 1) shows steeper decline above +25°C due to reduced copper thermal spreading.
Is SMAJ22CA-13-F qualified for automotive applications?
The standard SMAJ22CA-13-F is not AEC-Q101 qualified; Diodes offers an automotive-compliant version under separate part numbering (SMAJ22CAQ-13-F), manufactured in IATF 16949-certified facilities and tested per AEC-Q101 stress conditions. Use the "Q" suffix variant for production automotive ECUs requiring PPAP documentation and change control.
SMAJ22CA-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 11.2A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAJ22CA-13-F FAQ
1.How can I place an order for SMAJ22CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ22CA-13-F 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 SMAJ22CA-13-F reliable?
The price and inventory of SMAJ22CA-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ22CA-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ22CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ22CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ22CA-13-F?
SMAJ22CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ22CA-13-F 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 SMAJ22CA-13-F?
For technical support, including SMAJ22CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ22CA-13-F requirements.
6.How does Aetrix verify that SMAJ22CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ22CA-13-F 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 SMAJ22CA-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ22CA-13-F?
All SMAJ22CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ22CA-13-F, 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 SMAJ22CA-13-F part is unused and in its original packaging.
Return procedure for SMAJ22CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ22CA-13-F Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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onsemi
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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DESD5V0U1BB-7
Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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