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Taiwan Semiconductor Corporation SMAJ9.0C
- Part No.:
- SMAJ9.0C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ9.0C.pdf
- Description:
- 400W, 11.1V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:2,142
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Product details
Overview
SMAJ9.0C from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 9.0V working stand-off voltage (VWM), 10.0–12.2V breakdown voltage (VBR), and 16.9V maximum clamping voltage (VC) at 23.7A peak pulse current. It protects DC/DC converters and power adapters against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ9.0C datasheet, SMAJ9.0C pinout, SMAJ9.0C application, or SMAJ9.0C equivalent, key selection criteria include clamping performance under 10/1000μs surge, low leakage (<5μA at VWM), unidirectional polarity marking, and compliance with J-STD-020 Level 1 moisture sensitivity for automated SMT assembly.
Technical Context
The SMAJ9.0C operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified VBR range (10.0–12.2V at 1mA test current). Its glass-passivated junction ensures stable breakdown and fast response (<1.0ps from 0V to VBR min), enabling effective suppression of fast-rising ESD and load-dump transients.
It delivers 400W peak pulse power (10/1000μs waveform) up to 78V VWM; above that, rating drops to 300W. With TJ max = 150°C and TSTG = –55°C to +150°C, it supports industrial-grade operation in compact power supply rails where thermal margin and PCB space are constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 9.0 V - Maximum continuous reverse operating voltage before clamping begins; sets system overvoltage threshold for 12V rail protection. |
| VBR @ IT=1mA | 10.0–12.2 V - Confirmed avalanche onset range; ensures reliable triggering without premature conduction during normal operation. |
| VC @ IPPM | 16.9 V at 23.7 A - Clamped voltage during 10/1000μs surge; limits downstream IC stress to safe levels in 12V systems. |
| IR @ VWM | <5 μA - Ultra-low reverse leakage preserves efficiency in always-on circuits like automotive body controllers. |
| PPPM | 400 W (10/1000μs) - Peak surge energy handling capacity; meets ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity requirements. |
| Package | DO-214AC (SMA) - Standard surface-mount outline with 0.060g mass; compatible with J-STD-002 soldering and JESD 201 Class 2 whisker resistance. |
| Polarity | Cathode band marked - Unambiguous orientation for automated placement and manual inspection on PCB. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case with matte tin-plated leads, UL 94V-0 rated, polarity indicated by cathode band. Weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path); conducts during forward surge or bias conditions. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V input); avalanches into low-impedance state when transient exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable VBR across temperature and lifetime; eliminates parameter drift in harsh environments. |
| Fast response time <1.0 ps | Clamps sub-nanosecond ESD events before sensitive logic or analog circuitry sustains damage. |
| ISO 7637-2 compliance | Validated for automotive load-dump and coupled transient immunity (Pulse 1/2a/2b/3a/3b), supporting AEC-Q101-qualified designs. |
| J-STD-020 Level 1 moisture sensitivity | Enables standard reflow without baking; reduces manufacturing cost and cycle time in high-volume SMT lines. |
| RoHS & halogen-free | Meets IEC 61249-2-21; supports green electronics initiatives and end-of-life recycling requirements. |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceiver power rails from battery load-dump transients during alternator regulation faults. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12V supply and ground, clamping surges within 16.9V to prevent latch-up or gate oxide rupture. Use Value: Enables robust operation per ISO 7637-2 Pulse 5a (load dump) without derating or external series impedance. |
Use Scenario: Shields primary-side MOSFET gate drivers and controller ICs in isolated flyback converters from switching-induced voltage spikes. IC Role / Device Role / Timing Role: Fast-acting clamp on input bus (e.g., 24V rail), absorbing 400W 10/1000μs pulses generated by transformer leakage inductance. Use Value: Maintains <5μA leakage at 9V VWM to avoid standby current penalty while delivering sub-1ns response to edge-triggered transients. |
| LED Driver Power Input | USB-C PD Adapter Secondary Side |
Use Scenario: Safeguards constant-current LED driver ICs from inductive kickback when dimming MOSFETs switch off high-current strings. IC Role / Device Role / Timing Role: Unidirectional suppressor mounted directly across input capacitor, conducting only during reverse overvoltage events. Use Value: Limits clamping voltage to 16.9V, ensuring driver ICs rated for 20V absolute maximum survive repeated 100A surge events. |
Use Scenario: Guards secondary-side synchronous rectifier controllers and optocoupler feedback paths against reflected primary-side transients. IC Role / Device Role / Timing Role: Low-leakage (≤5μA) TVS on 5–20V output rails, suppressing cross-coupled noise from high-frequency GaN switching. Use Value: DO-214AC footprint enables dense layout near connector; J-STD-020 Level 1 allows direct placement into lead-free reflow without pre-bake. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ9.0A | Lower VBR range (10.0–11.1V), tighter tolerance; VC = 15.4V at 26.0A. | Better clamping margin for 12V systems requiring <15.5V protection ceiling. | Select SMAJ9.0A when lower clamping voltage is prioritized over higher surge current headroom. |
| SMBJ9.0C | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; 600W PPPM rating. | Higher power handling suits 24V industrial rails with frequent load dumps; requires larger PCB area. | Choose SMBJ9.0C when 600W surge capability is needed and DO-214AC footprint is insufficient. |
Compared with SMAJ9.0A, the SMAJ9.0C offers higher clamping current (23.7A vs. 26.0A) but slightly higher VC (16.9V vs. 15.4V); versus SMBJ9.0C, it trades 200W peak power for 30% smaller board area and identical electrical behavior in DO-214AC-constrained layouts.
Availability
SMAJ9.0C is available at Aetrix Electronics and suitable for automotive body control modules, industrial DC/DC converter input stages, and LED driver power inputs requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for SMAJ9.0C 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, including TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q101-qualified product lines.
The SMAJ series was designed specifically for high-reliability transient suppression in automotive and industrial power systems, emphasizing fast response, low leakage, and robust packaging for automated SMT deployment.
FAQ
What is the polarity configuration of the SMAJ9.0C?
The SMAJ9.0C is a unidirectional TVS diode, with cathode indicated by a visible band on the DO-214AC package. It conducts in forward bias and clamps reverse transients above its breakdown voltage. This polarity must be observed during PCB layout to ensure correct protection direction on the 12V rail or other protected line.
Does the SMAJ9.0C meet automotive transient immunity standards?
Yes, the SMAJ9.0C meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements for automotive electrical disturbances. Its 400W peak pulse power rating (10/1000μs), fast <1.0ps response, and verified clamping performance make it suitable for BCM, lighting, and infotainment power rail protection per OEM specifications.
What is the maximum clamping voltage of the SMAJ9.0C under surge conditions?
The SMAJ9.0C has a maximum clamping voltage (VC) of 16.9 V at 23.7 A peak impulse current (IPPM), measured using the standardized 10/1000μs waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events.
Can the SMAJ9.0C be used in bidirectional configurations?
No - the SMAJ9.0C is unidirectional only. For bidirectional protection, the SMAJ9.0CA variant must be selected. The "C" suffix denotes unidirectional construction; "CA" indicates center-tapped or symmetrical bidirectional design with identical characteristics in both polarities.
What is the moisture sensitivity level (MSL) of the SMAJ9.0C?
The SMAJ9.0C is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/85% RH and subjected to standard lead-free reflow profiles without baking. This simplifies SMT line integration and eliminates pre-conditioning steps in high-volume manufacturing.
SMAJ9.0C 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:
- 16.9V
- Current - Peak Pulse (10/1000µs):
- 23.7A
- 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)
SMAJ9.0C FAQ
1.How can I place an order for SMAJ9.0C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ9.0C 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 SMAJ9.0C reliable?
The price and inventory of SMAJ9.0C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ9.0C is usually 5 days.
3.What payment methods are accepted for SMAJ9.0C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ9.0C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ9.0C?
SMAJ9.0C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ9.0C 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 SMAJ9.0C?
For technical support, including SMAJ9.0C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ9.0C requirements.
6.How does Aetrix verify that SMAJ9.0C is sourced from the original manufacturer or authorized distributors?
All SMAJ9.0C 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 SMAJ9.0C meets industry standards.
7.What is the process for return or replacement of SMAJ9.0C?
All SMAJ9.0C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ9.0C, 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 SMAJ9.0C part is unused and in its original packaging.
Return procedure for SMAJ9.0C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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