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Taiwan Semiconductor Corporation SMAJ33CAH
- Part No.:
- SMAJ33CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33CAH.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
SMAJ33CAH from Taiwan Semiconductor is a bidirectional 33V transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power (10/1000μs), 59.0V maximum clamping voltage at 6.8A peak impulse current, and AEC-Q101 qualified for automotive-grade reliability. It protects DC/DC converters and SMPS against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMAJ33CAH datasheet, SMAJ33CAH pinout, SMAJ33CAH application, or SMAJ33CAH equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, DO-214AC mechanical interface details, and direct alternatives with documented voltage and clamping differences - all critical for ESD/surge protection design-in and automotive BOM validation.
Technical Context
The SMAJ33CAH is a glass-passivated, single-die, bidirectional TVS diode optimized for fast transient suppression in automotive and industrial power rails. Its breakdown voltage range is 36.7V to 40.6V at 1mA test current, with working stand-off voltage of 33V and <1μA reverse leakage at VWM.
It delivers sub-1ps response time from 0V to VBR min, meets JESD201 Class 2 whisker resistance, and operates across –55°C to +150°C junction temperature. The device sustains 400W peak pulse power up to 78V VWM; above that, rating reduces to 300W per specification note.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line voltage. |
| VBR min/max | 36.7 V / 40.6 V @ 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on during transients ≥36.7V. |
| VC @ IPPM | 53.3 V @ 6.8 A - Clamping voltage under 10/1000μs surge; defines worst-case overvoltage seen by downstream ICs. |
| PPPM | 400 W (10/1000μs) - Peak surge energy handling capacity; sufficient for ISO 7637-2 Pulse 1 (–150V/2Ω) and Pulse 2b (–100V). |
| IR @ VWM | <1 μA - Ultra-low leakage at rated stand-off; avoids parasitic loading on low-power sensor or MCU supply rails. |
| Package | DO-214AC (SMA) - Surface-mount outline with 0.060g mass, UL 94V-0 molding, matte tin leads, and J-STD-002 solderability. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with axial leads, cathode band marking polarity for unidirectional variants; SMAJ33CAH is bidirectional and marked with "CM" code - no polarity dependence. Leads are matte tin-plated, compliant with J-STD-002 soldering standards and JESD201 Class 2 whisker testing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | No fixed anode/cathode; terminals conduct equally in both directions - enables placement without orientation check on PCB. |
| Case (body) | Non-electrical mechanical interface | Insulated plastic housing; no thermal or electrical connection to die - thermal path relies solely on leadframe conduction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive underhood applications including temperature cycling, HTRB, and ESD stress - eliminates requalification effort for Tier 1 designs. |
| Fast response time <1 ps | Clamps transients before sensitive logic or analog circuitry responds - prevents latch-up or gate oxide damage in connected MOSFETs or MCUs. |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives - critical for high-humidity engine control modules. |
| ISO 7637-2 compliance | Guaranteed performance against standardized automotive load dump and switching surge waveforms (Pulse 1/2a/2b/3a/3b) - simplifies EMC test pass assurance. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive - supports green manufacturing and export compliance without material declaration overhead. |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protects 12V supply rail in BCM against load dump (ISO 7637-2 Pulse 5a) and alternator-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point before input filter capacitor. Use Value: Limits rail voltage to ≤53.3V during 400W transients - preserves operation of 36V-rated CAN transceivers and microcontrollers. |
Use Scenario: Shields isolated flyback or buck-boost converter input from 48V bus transients in factory automation equipment. IC Role / Device Role / Timing Role: Primary surge arrestor on secondary-side 33V bias rail feeding gate drivers and optocouplers. Use Value: Sub-1ps response ensures clamping occurs before 100ns propagation delay of PWM controller feedback loop - prevents false shutdown. |
| LED Headlamp Driver Unit | Telecom Power Interface Board |
Use Scenario: Safeguards constant-current LED driver ICs from inductive kickback during headlamp dimming transitions. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output stage, referenced to chassis ground. Use Value: 53.3V clamping prevents overvoltage stress on 60V-rated external MOSFETs - extends lifetime under repeated PWM switching. |
Use Scenario: Guards PoE-powered Ethernet switch interface against lightning-induced surges on 33V auxiliary supply lines. IC Role / Device Role / Timing Role: Secondary-level protection after primary GDT or gas discharge tube, before DC-DC regulator input. Use Value: 6.8A peak impulse rating handles residual energy passing through upstream protectors - ensures cascade coordination per IEC 61000-4-5. |
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 SMAJ33CA | Identical VWM (33V), VBR (36.7–40.6V), VC (53.3V), and DO-214AC package; differs only in AEC-Q101 certification status - not AEC-Q101 qualified. | Acceptable for industrial/commercial use but requires additional qualification for automotive production. | Select when AEC-Q101 is not mandated and cost sensitivity outweighs automotive audit requirements. |
| ON Semiconductor SMAJ33CA | VWM = 33V, VBR = 36.7–40.6V, VC = 53.3V, same DO-214AC package; fully AEC-Q101 qualified and ISO/TS 16949 certified. | Drop-in replacement with identical parametric performance and broader automotive process traceability. | Prefer for new automotive designs requiring full PPAP documentation and supplier quality system alignment. |
Compared with SMAJ33CAH, Littelfuse SMAJ33CA lacks AEC-Q101 validation - limiting use to non-automotive systems - while ON Semiconductor SMAJ33CA matches all electrical specs and adds full automotive process certification, making it suitable for safety-critical ECUs where audit readiness is mandatory.
Availability
SMAJ33CAH is available at Aetrix Electronics and suitable for automotive body control modules, industrial DC/DC converters, LED headlamp drivers, and telecom power interface boards requiring stable component supply with guaranteed AEC-Q101 compliance and ISO 7637-2 surge immunity.
Supply support for SMAJ33CAH 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, TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q101-compliant production lines.
The SMAJ series was designed specifically for robust, surface-mount transient suppression in automotive and harsh-environment industrial power systems - emphasizing fast response, high surge tolerance, and long-term reliability under thermal cycling.
FAQ
What does the "CAH" suffix indicate in SMAJ33CAH?
The "CAH" suffix in SMAJ33CAH denotes a bidirectional TVS diode with AEC-Q101 qualification and halogen-free construction. "C" indicates bidirectional configuration, "A" specifies tighter VBR tolerance (36.7–40.6V vs. 36.7–44.9V for "H"), and "H" confirms high-reliability automotive grade per TSC's A2102 revision. SMAJ33CAH is not polarity-sensitive and functions identically in either orientation.
How does SMAJ33CAH differ from SMAJ33AH?
SMAJ33CAH has tighter breakdown voltage tolerance (36.7–40.6V) than SMAJ33AH (36.7–44.9V), lower clamping voltage (53.3V vs. 59.0V at rated IPPM), and explicit AEC-Q101 qualification. SMAJ33AH is unidirectional and lacks automotive qualification - making SMAJ33CAH the only choice for bidirectional, AEC-Q101-compliant 33V surge protection.
Can SMAJ33CAH be used in place of SMAJ33A in an existing design?
Yes, SMAJ33CAH replaces SMAJ33A with improved performance: identical VWM (33V) and package (DO-214AC), but lower VC (53.3V vs. 59.0V), tighter VBR, and AEC-Q101 qualification. No PCB changes are needed - the bidirectional CAH variant maintains the same footprint and solder profile while enhancing surge margin and automotive compliance.
What is the maximum ambient temperature for continuous operation of SMAJ33CAH?
SMAJ33CAH supports continuous operation from –55°C to +150°C junction temperature. At TA = 25°C, its steady-state power dissipation is 1W; derating follows Fig.2 in the datasheet - e.g., at 100°C ambient, maximum PD drops to ~0.5W. Thermal design must ensure junction stays ≤150°C under worst-case surge and ambient conditions.
Does SMAJ33CAH meet ISO 7637-2 Pulse 5a (load dump) requirements?
SMAJ33CAH is rated for ISO 7637-2 Pulses 1, 2a, 2b, 3a, and 3b - but not Pulse 5a (load dump), which requires higher energy handling (≥1000W). For Pulse 5a, SMAJ33CAH must be paired with a higher-energy protector (e.g., TVS array or varistor) upstream; alone, it protects against lower-energy transients common in data lines and auxiliary rails.
SMAJ33CAH 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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 53.3V
- Current - Peak Pulse (10/1000µs):
- 7.5A
- 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)
SMAJ33CAH FAQ
1.How can I place an order for SMAJ33CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33CAH 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 SMAJ33CAH reliable?
The price and inventory of SMAJ33CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33CAH is usually 5 days.
3.What payment methods are accepted for SMAJ33CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33CAH?
SMAJ33CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33CAH 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 SMAJ33CAH?
For technical support, including SMAJ33CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33CAH requirements.
6.How does Aetrix verify that SMAJ33CAH is sourced from the original manufacturer or authorized distributors?
All SMAJ33CAH 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 SMAJ33CAH meets industry standards.
7.What is the process for return or replacement of SMAJ33CAH?
All SMAJ33CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33CAH, 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 SMAJ33CAH part is unused and in its original packaging.
Return procedure for SMAJ33CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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