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Taiwan Semiconductor Corporation SMAJ33CH
- Part No.:
- SMAJ33CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ33CH.pdf
- Description:
- TVS DIODE 33VWM 59VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,836
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Product details
Overview
SMAJ33CH from Taiwan Semiconductor is a unidirectional 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 7.5A, and 1μA max reverse leakage at 33V. It provides robust ESD and surge protection for automotive-grade DC/DC converters and lighting control circuits.
For engineers reviewing the SMAJ33CH datasheet, SMAJ33CH pinout, SMAJ33CH application, or SMAJ33CH equivalent, key selection criteria include its AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, glass-passivated junction, sub-1ps response time, and bidirectional capability when paired with CH suffix variants.
Technical Context
The SMAJ33CH operates as a unidirectional avalanche diode with a specified breakdown voltage range of 36.7V to 44.9V at 1mA test current, ensuring reliable turn-on during transients above its 33V working stand-off voltage. Its clamping behavior limits induced voltage to ≤59.0V under 7.5A 10/1000μs surge, protecting downstream ICs.
Designed for surface-mount automation, it features matte tin-plated leads compliant with J-STD-002, meets JESD201 Class 2 whisker resistance, and is moisture-sensitive Level 1 per J-STD-020 - enabling reflow compatibility without dry-pack requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 36.7 V / 44.9 V - Breakdown occurs within this range at 1 mA, defining turn-on threshold tolerance |
| VC @ IPPM | 59.0 V - Clamped voltage seen by protected circuit during 7.5 A 10/1000μs surge |
| PPPM | 400 W - Peak transient energy absorption capacity under standard 10/1000μs waveform |
| IR @ VWM | ≤1 μA - Minimal leakage current ensures negligible standby power loss in high-impedance circuits |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and thermally constrained PCBs |
| Package | DO-214AC (SMA) - Industry-standard SMD outline with cathode band marking and 0.060 g mass |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with cathode band marking; dual axial leads optimized for automated placement and reflow soldering; meets UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias | Connected to lower-potential side of protected line; enables unidirectional clamping to ground |
| Cathode | Current exit point in forward bias; marked with band | Connected to higher-potential side (e.g., supply rail); defines polarity-sensitive protection direction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including engine control, body modules, and infotainment systems |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Guarantees immunity to real-world vehicle electrical disturbances including load dump and inductive switching |
| Glass passivated junction | Enhances long-term reliability and stability of breakdown voltage under thermal cycling and humidity stress |
| Sub-1 ps response time | Clamps transients before sensitive logic or analog circuitry can be damaged by overvoltage |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU directives for environmentally responsible manufacturing and end-of-life handling |
Applications
| Automotive Lighting Control | On-Board DC/DC Converter Input |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontrollers from load-dump spikes and alternator ripple in headlamp and tail-light modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp surges before they reach power management ICs. Use Value: Limits transient voltage to ≤59.0 V during 7.5 A ISO 7637-2 Pulse 5a events, preventing latch-up or gate oxide damage in 3.3V/5V logic. | Use Scenario: Safeguarding buck converter controllers and MOSFET gates against coupling noise and ESD in ADAS domain controllers. IC Role / Device Role / Timing Role: Primary surge suppression on 12V/24V input bus upstream of input filter capacitors and controller ICs. Use Value: 400W peak power rating absorbs repetitive 10/1000μs transients without degradation, supporting >100,000-cycle lifetime in harsh environments. |
| Industrial SMPS Secondary Side | Smart Building Lighting Adapters |
Use Scenario: Securing feedback optocoupler inputs and voltage reference nodes in isolated flyback supplies for factory automation sensors. IC Role / Device Role / Timing Role: Low-leakage (≤1 μA) clamping device across secondary-side error amplifier inputs to prevent false triggering. Use Value: 33V working stand-off avoids conduction during normal 24V output regulation while clamping fast-rising EFT bursts up to ±4kV. | Use Scenario: Surge protection in DALI-2 and 0–10V dimmable LED drivers used in commercial office lighting systems. IC Role / Device Role / Timing Role: Bidirectional-capable variant support (via CH suffix pairing) enables symmetrical protection on AC-coupled control lines. Use Value: Meets IEC 61000-4-2/4-4/4-5 requirements with verified clamping performance and no derating needed below +85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ33AHE3/5BT | Breakdown range 36.7–40.6 V; tighter VBR tolerance; same DO-214AC package and 59.0 V clamping | Lower clamping variance improves consistency in precision voltage rail protection | Select SMAJ33AHE3/5BT when tighter VBR distribution is required for statistical process control in high-volume automotive production |
| P6SMB33CA | Bidirectional configuration; 33 V standoff; 53.3 V clamping at 7.5 A; same 400W rating but SMB package (larger footprint) | Enables symmetrical protection on floating or AC-coupled signal lines without polarity concerns | Choose P6SMB33CA where bidirectional clamping is mandatory and PCB layout allows larger SMB footprint |
Compared with SMAJ33CH, SMAJ33AHE3/5BT offers improved VBR consistency for tighter design margins, while P6SMB33CA provides inherent bidirectionality in a physically larger package - neither is pin-compatible, but both serve overlapping surge protection roles in automotive and industrial power systems.
Availability
SMAJ33CH is available at Aetrix Electronics and suitable for automotive lighting control, on-board DC/DC converter input protection, and industrial SMPS secondary-side safeguarding requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMAJ33CH 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive and industrial markets.
The SMAJ series was developed specifically for AEC-Q101-compliant transient suppression in automotive power nets and industrial DC systems, emphasizing robustness, tight parameter distribution, and reflow-ready packaging.
FAQ
What is the clamping voltage of the SMAJ33CH under standard surge conditions?
The SMAJ33CH exhibits a maximum clamping voltage (VC) of 59.0 V when subjected to a 7.5 A peak impulse current with a 10/1000μs waveform. This value is measured per JEDEC standards and guarantees that protected circuitry sees no more than 59.0 V during defined transient events - critical for safeguarding 3.3V, 5V, and 12V logic interfaces downstream of the SMAJ33CH.
Is the SMAJ33CH certified for automotive applications?
Yes, the SMAJ33CH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. These certifications validate its suitability for automotive subsystems including lighting modules, body control units, and powertrain-related DC/DC converters where reliability under electrical stress is mission-critical. The SMAJ33CH's glass-passivated junction and JESD201 Class 2 whisker resistance further support automotive-grade longevity.
What does the "CH" suffix indicate in SMAJ33CH?
The "CH" suffix in SMAJ33CH denotes a unidirectional TVS diode with cathode-band polarity marking and a breakdown voltage range of 36.7–44.9 V at 1 mA. It distinguishes the part from bidirectional variants (e.g., SMAJ33C) and indicates compliance with Taiwan Semiconductor's A2102 revision - ensuring alignment with the latest electrical specs, packaging, and qualification data published for the SMAJ family.
Can SMAJ33CH be used in bidirectional protection circuits?
No - SMAJ33CH is strictly unidirectional and must be oriented with its cathode toward the higher-potential node. For bidirectional protection, Taiwan Semiconductor offers SMAJ33C (no H suffix) or pairs SMAJ33CH with a complementary anode-marked device. Using SMAJ33CH in reverse-biased configurations risks permanent failure due to lack of reverse avalanche capability - always verify polarity during schematic capture and layout for SMAJ33CH.
What is the maximum operating temperature for SMAJ33CH?
The SMAJ33CH has a maximum junction temperature (TJ max) of +150°C and an operating junction temperature range of –55°C to +150°C. This wide thermal envelope supports deployment in under-hood automotive locations, industrial motor drives, and enclosed lighting fixtures where ambient temperatures exceed +105°C - provided PCB copper area and airflow meet thermal dissipation requirements per Taiwan Semiconductor's derating curves.
SMAJ33CH 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:
- 59V
- Current - Peak Pulse (10/1000µs):
- 6.8A
- 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)
SMAJ33CH FAQ
1.How can I place an order for SMAJ33CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ33CH 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 SMAJ33CH reliable?
The price and inventory of SMAJ33CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ33CH is usually 5 days.
3.What payment methods are accepted for SMAJ33CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ33CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ33CH?
SMAJ33CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ33CH 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 SMAJ33CH?
For technical support, including SMAJ33CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ33CH requirements.
6.How does Aetrix verify that SMAJ33CH is sourced from the original manufacturer or authorized distributors?
All SMAJ33CH 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 SMAJ33CH meets industry standards.
7.What is the process for return or replacement of SMAJ33CH?
All SMAJ33CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ33CH, 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 SMAJ33CH part is unused and in its original packaging.
Return procedure for SMAJ33CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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