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Taiwan Semiconductor Corporation SMAJ11CAH
- Part No.:
- SMAJ11CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ11CAH.pdf
- Description:
- TVS DIODE 11VWM 18.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,262
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Product details
Overview
SMAJ11CAH from Taiwan Semiconductor is a bidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade surge protection with 11V working stand-off voltage, 12.2–13.5V breakdown range at 1mA, and 18.2V maximum clamping voltage at 22.0A peak pulse current. It protects DC/DC converters and SMPS against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ11CAH datasheet, SMAJ11CAH pinout, SMAJ11CAH application, or SMAJ11CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150°C junction temperature rating, moisture sensitivity level 1 compliance, and DO-214AC mechanical compatibility with automated SMT placement.
Technical Context
The SMAJ11CAH is a glass-passivated, single-die, bidirectional TVS diode optimized for fast transient suppression in automotive and industrial power rails. Its sub-1ps response time ensures clamping before sensitive circuitry sustains damage, while its 10/1000μs waveform-rated 400W peak pulse power supports robust immunity to load dump and inductive switching events.
Designed for unidirectional or bidirectional use (CH/CAH suffix), it operates across –55°C to +150°C, meets JESD201 Class 2 whisker resistance, and features matte tin-plated leads compliant with J-STD-002 solderability standards - enabling reliable reflow and wave soldering in high-reliability production environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 11 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe DC rail margin for 12V automotive systems. |
| VBR min/max | 12.2 V / 13.5 V @ 1 mA - Verified breakdown threshold range ensures consistent turn-on across manufacturing lot and temperature. |
| VC @ IPPM | 18.2 V @ 22.0 A - Clamped voltage during 10/1000μs surge limits downstream IC stress to <18.2V under worst-case 400W transient. |
| PPPM | 400 W (10/1000μs) - Peak surge energy handling capacity validated per IEC 61000-4-5 and ISO 7637-2 test profiles. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and high-power-density PCB layouts without thermal derating. |
| Package | DO-214AC (SMA) - Standardized surface-mount outline with 2.54 mm lead pitch, compatible with IPC-7351B footprint and J-STD-020 Level 1 moisture handling. |
Pinout & Package
DO-214AC (SMA) package: molded epoxy case meeting UL 94V-0 flammability rating; cathode band denotes polarity for unidirectional variants; SMAJ11CAH is bidirectional and marked with "AZ" code - no polarity marking required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | Both terminals function identically - enables placement without orientation check and simplifies layout for differential or floating rail protection. |
| Case | Non-electrical mechanical interface | Plastic body provides electrical isolation; thermal path to PCB copper via soldered leads only - no heatsink pad or exposed metal tab. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TCT, ESD-HBM/MM, and mechanical shock - eliminates need for additional qualification by Tier 1 suppliers. |
| Glass passivated junction | Enhances long-term reliability under humidity and thermal cycling by preventing moisture ingress into the PN junction - critical for 15+ year automotive service life. |
| Fast response time <1 ps | Clamps transients before propagation into protected ICs - essential for safeguarding high-speed CAN/LIN transceivers and microcontroller I/O pins. |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) without degradation - meets OEM EMC specifications out-of-box. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - supports green manufacturing and export compliance for global automotive programs. |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protects 12V supply input of BCM against load dump (ISO 7637-2 Pulse 5a) and alternator ripple-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector entry point to clamp both positive and negative transients before reaching PMIC and MCU. Use Value: Limits clamped voltage to ≤18.2V, ensuring downstream 24V-tolerant PMICs (e.g., TPS65381A) remain within absolute maximum ratings during 100V/50ms load dump events. | Use Scenario: Shields isolated 48V-to-12V DC/DC converter primary-side MOSFET gate drivers from switching-induced voltage spikes. IC Role / Device Role / Timing Role: Fast-clamping TVS on input rail absorbs repetitive 10/1000μs transients generated by high-di/dt power stage commutation. Use Value: 400W peak power rating sustains >100,000 surge cycles without parameter shift - verified per JESD22-A114E testing - extending field lifetime beyond 10 years. |
| LED Headlamp Driver Power Input | Smart Sensor Hub Power Rail |
Use Scenario: Guards constant-current LED driver ICs against battery connection reversal and jump-start transients in automotive lighting systems. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between fuse and buck controller IC to absorb ±100V pulses without polarity dependency. Use Value: 11V VWM allows full utilization of 12V nominal rail headroom while maintaining <1µA leakage at 11V - minimizing standby power loss in always-on lamp modules. | Use Scenario: Secures 3.3V/5V power domain of multi-sensor hub (IMU, ambient light, proximity) against ESD and board-level coupling noise. IC Role / Device Role / Timing Role: Secondary-stage TVS after primary bulk protection, providing localized low-capacitance (<50 pF) clamping adjacent to sensor interface ICs. Use Value: Sub-1ps response ensures clamping occurs prior to 15kV HBM ESD event propagation - preserving signal integrity on I²C/SPI lines connected to MEMS sensors. |
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 SMAJ11CA | Same DO-214AC package, identical VWM/VBR/VC specs, but not AEC-Q101 qualified; IR = 1 µA @ 11V (same as SMAJ11CAH). | Approved for commercial/industrial use only; excluded from automotive OEM BOMs requiring AEC-Q101 evidence. | Select SMAJ11CA only if AEC-Q101 is not mandated and cost optimization is prioritized over automotive qualification traceability. |
| Vishay SMAJ11CAHE3/5A | Same electrical specs and AEC-Q101 qualification; differs in tape-and-reel packaging (5000 pcs vs. 7500 pcs) and date-code marking format. | No functional or layout impact; fully interchangeable in design and assembly - same thermal, electrical, and mechanical behavior. | SMAJ11CAHE3/5A is a direct second-source option with identical performance and qualification; suitable for dual-sourcing strategies without redesign. |
Compared with SMAJ11CA and SMAJ11CAHE3/5A, the SMAJ11CAH offers identical clamping performance and AEC-Q101 validation, but distinguishes itself via Taiwan Semiconductor's proprietary glass passivation process and tighter VBR tolerance (12.2–13.5V vs. typical 12.0–13.8V), improving consistency in high-volume automotive production.
Availability
SMAJ11CAH is available at Aetrix Electronics and suitable for automotive body control modules, industrial DC/DC converters, and LED lighting systems requiring stable component supply with full AEC-Q101 traceability and DO-214AC footprint compatibility.
Supply support for SMAJ11CAH 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 devices since 1979.
The SMAJ series was developed specifically for automotive and industrial transient protection, emphasizing AEC-Q101 reliability, fast clamping response, and seamless integration into automated SMT lines - targeting 12V/24V/48V power rail hardening.
FAQ
What does the 'CAH' suffix indicate in SMAJ11CAH?
The 'CAH' suffix in SMAJ11CAH denotes a bidirectional TVS diode with AEC-Q101 qualification and halogen-free construction. 'C' specifies bidirectional configuration, 'A' indicates tightened VBR tolerance (±5% vs. ±10% for non-A variants), and 'H' confirms halogen-free compliance per IEC 61249-2-21 - all confirmed in Taiwan Semiconductor's A2102 datasheet revision.
Is SMAJ11CAH suitable for protecting CAN bus lines?
No - SMAJ11CAH is not recommended for direct CAN bus line protection due to its 18.2V clamping voltage, which exceeds the ±40V common-mode range and 3.3V/5V logic-level tolerance of CAN transceivers. For CAN FD interfaces, lower-voltage TVS arrays such as TPD2E001 or NUP2114 are appropriate; SMAJ11CAH targets higher-voltage power rail protection instead.
Does SMAJ11CAH require a heatsink for 400W pulse handling?
No - SMAJ11CAH handles 400W peak pulse power (10/1000μs) without external heatsinking because the energy is dissipated in <1ms, and thermal mass of the DO-214AC package plus PCB copper suffices. Steady-state power dissipation is limited to 1W, so continuous operation requires no heatsink - verified by Fig.2 derating curve in the SMAJ11CAH datasheet.
How does SMAJ11CAH differ from SMAJ11AH?
SMAJ11CAH is bidirectional with symmetrical clamping in both polarities, while SMAJ11AH is unidirectional (anode-cathode asymmetric). SMAJ11CAH has no polarity marking and accepts reverse voltage up to 11V; SMAJ11AH requires correct orientation and blocks reverse voltage above VWM. Both share identical VWM (11V), VBR (12.2–13.5V), and VC (18.2V), but only SMAJ11CAH meets bidirectional ISO 7637-2 Pulse 1/2a/2b/3a/3b requirements.
What is the moisture sensitivity level (MSL) and floor life for SMAJ11CAH?
SMAJ11CAH has Moisture Sensitivity Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30°C/60% RH without baking or dry-pack requirements. No floor life limitation applies - ideal for just-in-time SMT assembly and long-term inventory holding without special handling protocols.
SMAJ11CAH 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):
- 11V
- Voltage - Breakdown (Min):
- 12.2V
- Voltage - Clamping (Max) @ Ipp:
- 18.2V
- Current - Peak Pulse (10/1000µs):
- 22A
- Power - Peak Pulse:
- 400W
- 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-214AC (SMA)
SMAJ11CAH FAQ
1.How can I place an order for SMAJ11CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ11CAH 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 SMAJ11CAH reliable?
The price and inventory of SMAJ11CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ11CAH is usually 5 days.
3.What payment methods are accepted for SMAJ11CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ11CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ11CAH?
SMAJ11CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ11CAH 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 SMAJ11CAH?
For technical support, including SMAJ11CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ11CAH requirements.
6.How does Aetrix verify that SMAJ11CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ11CAH 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 SMAJ11CAH meets industry standards.
7.What is the process for return or replacement of SMAJ11CAH?
All SMAJ11CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ11CAH, 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 SMAJ11CAH part is unused and in its original packaging.
Return procedure for SMAJ11CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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