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Taiwan Semiconductor Corporation SMAJ9.0CA
- Part No.:
- SMAJ9.0CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ9.0CA.pdf
- Description:
- TVS DIODE 9VWM 15.4VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,115
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Product details
Overview
SMAJ9.0CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for clamping fast transients in DC power lines. It features a 9.0 V working stand-off voltage (VWM), 10.0–11.1 V breakdown voltage (VBR), 15.4 V maximum clamping voltage (VC) at 26.0 A peak pulse current, and 400 W peak pulse power rating with 10/1000 µs waveform - used in automotive power rail protection and industrial DC/DC converters.
For engineers reviewing the SMAJ9.0CA datasheet, SMAJ9.0CA pinout, SMAJ9.0CA application, or SMAJ9.0CA equivalent, key selection criteria include bidirectional clamping capability, low leakage (<1 µA at 9.0 V), ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and DO-214AC thermal and mechanical compatibility with high-density PCB layouts.
Technical Context
The SMAJ9.0CA operates as a bidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-1 ps response time and stable clamping under repetitive surge events. Its symmetrical V-I characteristic enables identical forward and reverse conduction behavior, supporting polarity-agnostic placement on unidirectional or bidirectional signal/power lines.
Designed for 10/1000 µs surge waveforms per IEC 61000-4-5 and ISO 7637-2, it delivers 26.0 A peak impulse current (IPPM) while limiting clamped voltage to ≤15.4 V - critical for protecting 12 V automotive electronics and 9–15 V industrial control inputs against load dump and inductive switching transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 9.0 V - Maximum continuous reverse/forward voltage before significant leakage; ensures no false triggering in nominal 9 V systems. |
| VBR @ IT=1 mA | 10.0–11.1 V - Measured breakdown range confirming reliable avalanche initiation within specification tolerance. |
| VC @ IPPM=26.0 A | 15.4 V - Clamped voltage during 10/1000 µs surge; guarantees downstream ICs rated ≥16 V remain within safe operating area. |
| IPPM | 26.0 A - Peak surge current handling capacity; supports robust protection against ISO 7637-2 Pulse 5a (load dump). |
| PPPM | 400 W - Peak pulse power rating at TA=25°C; derates linearly above 25°C per Fig.2 for thermal design margining. |
| IR @ VWM | <1 µA - Reverse leakage at 9.0 V; minimizes standby power loss and avoids false trips in low-current sensor circuits. |
| TJ Range | −55°C to +150°C - Extended junction temperature range enabling use in under-hood automotive and industrial environments. |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking; dual-terminal configuration optimized for automated placement and reflow soldering. Matte tin-plated leads meet J-STD-002 solderability requirements and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (bidirectional) | Surge current path | Terminals are functionally symmetric; either terminal may serve as input or return - no polarity dependency in circuit layout. |
| Cathode band (marking) | Manufacturing orientation indicator | Visible band denotes terminal 1 per DO-214AC standard; irrelevant for electrical function in CA (bidirectional) variant but required for visual traceability. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating DC lines without external polarity management. |
| Sub-1 ps response time | Ensures suppression initiates before nanosecond-scale ESD or fast-edge transients damage sensitive inputs. |
| ISO 7637-2 compliance | Validated for automotive Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (line impedance transients). |
| Moisture sensitivity level 1 | Eliminates bake requirements prior to reflow; supports standard SMT assembly without special handling. |
| UL 94V-0 molding compound | Provides flame-retardant encapsulation essential for safety-critical automotive and industrial end equipment. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protecting 12 V supply rails in BCMs against load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed directly at connector entry point before LDO regulators and microcontroller power pins. Use Value: Limits clamped voltage to 15.4 V, ensuring downstream 16 V-rated regulators and 5 V logic remain undamaged during 100 V/500 ms surges. | Use Scenario: Safeguarding 24 V digital input channels from field-wiring induced transients in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional TVS mounted across input terminals to absorb both positive and negative polarity surges from relay coil flyback or cable ESD. Use Value: Symmetric clamping eliminates need for dual unidirectional devices, reducing BOM count and PCB area by 50% versus discrete solutions. |
| LED Driver Power Supply | On-board DC/DC Converter |
Use Scenario: Suppressing switching noise and inductive kickback in constant-current LED drivers for street lighting. IC Role / Device Role / Timing Role: Placed across primary-side MOSFET drain-source or secondary-side rectifier output to limit voltage overshoot during PWM transitions. Use Value: 400 W peak power rating sustains repeated 10/1000 µs surges without degradation, extending driver lifetime in outdoor thermal cycling environments. | Use Scenario: Protecting isolated 5 V or 3.3 V outputs of buck-boost DC/DC modules in telecom base stations. IC Role / Device Role / Timing Role: Secondary-side TVS connected between output rail and ground to clamp coupling noise from primary-side switching or hot-swap events. Use Value: 1 µA max leakage at 9 V prevents loading of low-power standby circuits, preserving sleep-mode current budgets below 10 µA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ9.0A | Unidirectional; same VWM, VBR, VC, and PPPM, but only conducts in reverse direction. | Requires correct polarity placement; unsuitable for AC or floating-bus protection where polarity is undefined. | Select SMAJ9.0A only when circuit topology enforces fixed polarity and space allows explicit cathode orientation. |
| SMBJ9.0CA | Same electrical specs but in larger DO-214AA (SMB) package; 600 W PPPM rating at 25°C. | Higher thermal mass supports higher surge repetition rates; requires larger PCB footprint and different pad layout. | Choose SMBJ9.0CA when system-level testing shows 400 W insufficient for worst-case surge duty cycle or ambient temperature exceeds 85°C. |
Compared with SMAJ9.0A and SMBJ9.0CA, the SMAJ9.0CA uniquely balances bidirectional functionality, DO-214AC compactness, and certified ISO 7637-2 immunity - making it optimal for space-constrained automotive and industrial modules requiring polarity-agnostic surge resilience.
Availability
SMAJ9.0CA is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, LED driver power supplies, and on-board DC/DC converter designs requiring stable component supply across extended temperature and surge stress conditions.
Supply support for SMAJ9.0CA 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 components.
The SMAJ series was developed specifically for high-reliability transient suppression in automotive and industrial power systems, emphasizing ISO 7637-2 compliance, moisture-insensitive packaging, and tight parametric tolerances for automated manufacturing.
FAQ
What does the 'CA' suffix indicate in SMAJ9.0CA?
The 'CA' suffix in SMAJ9.0CA denotes a bidirectional configuration - meaning the device provides symmetrical clamping in both forward and reverse directions. Unlike unidirectional variants (e.g., SMAJ9.0A), SMAJ9.0CA has no polarity-dependent terminals and can be placed without regard to anode/cathode orientation. This feature is explicitly confirmed in the "Devices for Bipolar Applications" section of the Taiwan Semiconductor datasheet for SMAJ5.0(A)–SMAJ188(A).
Does SMAJ9.0CA meet automotive EMC standards?
Yes, SMAJ9.0CA meets ISO 7637-2 requirements for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (capacitive coupling transients). This compliance is explicitly stated in the FEATURES section of the official Taiwan Semiconductor datasheet (Version U2102), and verified via test data referenced in the Electrical Specifications table for all CA-suffixed parts.
What is the maximum clamping voltage of SMAJ9.0CA under surge conditions?
The maximum clamping voltage (VC) of SMAJ9.0CA is 15.4 V, measured at 26.0 A peak pulse current (IPPM) using the standardized 10/1000 µs waveform. This value is specified in the ELECTRICAL SPECIFICATIONS table for SMAJ9.0A (bidirectional counterpart), and applies identically to SMAJ9.0CA per Taiwan Semiconductor's family documentation.
Can SMAJ9.0CA be used in place of SMAJ9.0A?
No - SMAJ9.0CA and SMAJ9.0A are not interchangeable without circuit review. SMAJ9.0CA is bidirectional and polarity-agnostic, while SMAJ9.0A is unidirectional and requires correct cathode orientation. Substituting SMAJ9.0CA for SMAJ9.0A introduces no functional risk, but replacing SMAJ9.0CA with SMAJ9.0A may leave circuits unprotected against reverse-polarity transients unless layout and schematic enforce strict polarity control.
What is the thermal derating behavior of SMAJ9.0CA above 25°C?
SMAJ9.0CA follows the Pulse Derating Curve (Fig.2) in the Taiwan Semiconductor datasheet: its 400 W peak pulse power rating decreases linearly above 25°C ambient, reaching ~200 W at 100°C and ~100 W at 125°C. This derating must be applied when designing for high-temperature enclosures or sustained surge duty cycles, and is independent of the steady-state 1 W power dissipation limit.
SMAJ9.0CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 9V
- Voltage - Breakdown (Min):
- 10V
- Voltage - Clamping (Max) @ Ipp:
- 15.4V
- Current - Peak Pulse (10/1000µs):
- 26A
- 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:
- DO-214AC (SMA)
SMAJ9.0CA FAQ
1.How can I place an order for SMAJ9.0CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ9.0CA 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 SMAJ9.0CA reliable?
The price and inventory of SMAJ9.0CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ9.0CA is usually 5 days.
3.What payment methods are accepted for SMAJ9.0CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ9.0CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ9.0CA?
SMAJ9.0CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ9.0CA 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 SMAJ9.0CA?
For technical support, including SMAJ9.0CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ9.0CA requirements.
6.How does Aetrix verify that SMAJ9.0CA is sourced from the original manufacturer or authorized distributors?
All SMAJ9.0CA 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 SMAJ9.0CA meets industry standards.
7.What is the process for return or replacement of SMAJ9.0CA?
All SMAJ9.0CA units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ9.0CA, 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 SMAJ9.0CA part is unused and in its original packaging.
Return procedure for SMAJ9.0CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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