My Inquiry
My Account
Taiwan Semiconductor Corporation SMCJ33CAH
- Part No.:
- SMCJ33CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33CAH.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,580
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ33CAH from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 33V working stand-off voltage (VWM), 36.7–40.6V breakdown voltage (VBR), and 53.3V maximum clamping voltage (VC) at 29A peak pulse current. It delivers AEC-Q101 qualification and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive load-dump and ESD protection in power rails.
For engineers reviewing the SMCJ33CAH datasheet, SMCJ33CAH pinout, SMCJ33CAH application, or SMCJ33CAH equivalent, this device is selected for high-energy transient suppression in 12V/24V automotive subsystems, industrial I/O interfaces, and DC power input stages where fast response (<1.0 ps), low leakage (<1 µA @ 33V), and robust 1500W surge handling are required.
Technical Context
The SMCJ33CAH is a bipolar TVS diode designed for symmetrical transient suppression in both forward and reverse directions, enabling direct placement across unidirectional or bidirectional signal/power lines without polarity concerns. Its glass-passivated junction ensures stable VBR tolerance and long-term reliability under repetitive surge stress.
Thermal performance is defined by RθJC = 10°C/W and RθJA = 55°C/W, supporting continuous operation up to +150°C junction temperature. It complies with JESD201 Class 2 whisker resistance and J-STD-020 moisture sensitivity level 1, making it suitable for lead-free reflow assembly without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse operating voltage before clamping begins; sets safe DC bias margin for 24V nominal systems. |
| VBR min/max | 36.7 V / 40.6 V @ 1 mA - Tight 10.6% VBR tolerance ensures predictable turn-on across production lots and temperature. |
| VC @ IPPM | 53.3 V @ 29 A - Clamping voltage during 10/1000 µs surge defines worst-case overvoltage seen by protected ICs. |
| PPK | 1500 W - Peak pulse power rating per single 10/1000 µs waveform; enables robust protection against ISO 7637-2 Pulse 5a (load dump). |
| IR @ VWM | <1 µA - Ultra-low reverse leakage preserves battery life and avoids false triggering in always-on circuits. |
| TJ max | +150 °C - Extended junction temperature rating supports under-hood automotive and high-ambient industrial environments. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, bidirectional configuration with cathode band omitted (no polarity marking required). Matte tin-plated leads, RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Connected to system ground or low-impedance reference; forms symmetrical clamp with cathode during either polarity surge. |
| Cathode | Transient return path (bidirectional) | Connected to protected line (e.g., CAN_H, 24V rail); functions identically to anode due to bidirectional structure. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - required for engine control, body electronics, and ADAS modules. |
| ISO 7637-2 compliance | Passes Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (capacitive coupling) - covers full vehicle-level EMC immunity testing. |
| Glass-passivated junction | Eliminates metallurgical degradation under repeated surge stress, ensuring stable VBR and VC over >1000 surges at rated PPK. |
| Fast response time | <1.0 ps rise-to-VBR - clamps before sensitive downstream transistors or microcontrollers experience destructive overvoltage. |
| Moisture sensitivity level 1 | No floor-life limitation or baking required prior to reflow - simplifies SMT line logistics and reduces manufacturing cost. |
Applications
| Automotive Power Input Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: Protecting 24V supply inputs of ECUs, sensors, and lighting modules against load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: Primary bidirectional clamping element placed directly at connector entry point, shunting surge energy to chassis ground. Use Value: Limits peak rail voltage to ≤53.3V during 1500W surges, preventing damage to 36V-rated DC-DC converters and MCU power supplies. |
Use Scenario: Shielding CAN_H/CAN_L differential pair from ESD (IEC 61000-4-2 ±8 kV contact) and coupled transients in factory automation nodes. IC Role / Device Role / Timing Role: Bidirectional TVS pair (one per line) referenced to common ground, providing symmetrical clamping without signal distortion. Use Value: Maintains CAN signal integrity by clamping transients within 1.0 ps while adding <1 pF junction capacitance - no data rate degradation at 1 Mbps. |
| Telecom DC Power Feeds | Renewable Energy Charge Controllers |
Use Scenario: Safeguarding -48V telecom rectifier outputs and PoE injectors against lightning-induced surges on outdoor cable runs. IC Role / Device Role / Timing Role: Secondary surge protector downstream of GDT or MOV primary stages, absorbing residual energy and refining clamping precision. Use Value: Delivers 53.3V clamping at 29A with <1 µA leakage - avoids false trips in high-impedance monitoring circuits while meeting Telcordia GR-1089-CORE. |
Use Scenario: Protecting MPPT controller inputs connected to solar panel strings exposed to lightning-induced common-mode transients. IC Role / Device Role / Timing Role: Line-to-ground TVS on PV+ and PV− inputs, configured in bidirectional mode to handle polarity-reversal events during fault conditions. Use Value: Withstands 1500W pulses and operates from -55°C to +150°C - ensures reliability in desert-mounted inverters with wide thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | Lower PPK (600W), same VWM/VBR/VC specs, SMB package (smaller footprint, higher RθJA = 85°C/W) | Limited to lower-energy transients (e.g., IEC 61000-4-5 Level 3); unsuitable for ISO 7637-2 Pulse 5a load dump | Select when board space is constrained and surge threat level is limited to ESD and minor switching noise. |
| 1.5KE33CA | Same 1500W rating and 33V VWM, but through-hole DO-201AD package; slower response (~1.5 ps), higher IR (≤5 µA) | Requires wave soldering or hand assembly; not AEC-Q101 qualified; incompatible with automated SMT lines | Choose only for legacy through-hole designs or prototyping where reflow compatibility is not required. |
Compared with SMBJ33CA and 1.5KE33CA, the SMCJ33CAH provides superior surge robustness in a compact, AEC-Q101-qualified SMT package with faster response and lower leakage - making it the preferred choice for production automotive and industrial systems requiring automated assembly and full ISO 7637-2 compliance.
Availability
SMCJ33CAH is available at Aetrix Electronics and suitable for automotive power distribution, industrial fieldbus interfaces, telecom DC feeds, and renewable energy controllers requiring stable component supply across multi-year production cycles.
Supply support for SMCJ33CAH 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 high-reliability protection devices, rectifiers, and power MOSFETs.
The SMCJ series is part of TSC's AEC-Q101-qualified TVS portfolio, engineered specifically for automotive and industrial applications demanding certified surge immunity, extended temperature operation, and SMT manufacturability.
FAQ
What does the 'CAH' suffix indicate in SMCJ33CAH?
The 'CAH' suffix in SMCJ33CAH denotes a bidirectional TVS diode ('C') in the high-reliability, AEC-Q101-qualified ('A') DO-214AB (SMC) package ('H'). Unlike unidirectional 'H' variants, the 'C' version provides symmetrical clamping in both polarities - essential for protecting AC-coupled or floating lines like CAN bus or Ethernet pairs. The SMCJ33CAH achieves this without internal series diodes, preserving low capacitance and fast response.
How does SMCJ33CAH differ from SMCJ33AH?
The SMCJ33CAH is bidirectional, while SMCJ33AH is unidirectional. Both share identical VWM (33V), VBR (36.7–40.6V), and VC (53.3V), but SMCJ33AH has a cathode band marking and conducts forward current only in one direction. SMCJ33CAH has no polarity marking and clamps equally for positive or negative transients - critical for differential signaling or systems where voltage reversal may occur. This structural difference makes them non-interchangeable without circuit review.
Is SMCJ33CAH suitable for protecting a 24V automotive CAN transceiver?
Yes, the SMCJ33CAH is well-suited for protecting 24V automotive CAN transceivers. Its 33V VWM provides adequate margin above 24V nominal rail, while its 53.3V clamping voltage stays below typical CAN transceiver absolute maximum ratings (e.g., 60V). The bidirectional configuration protects both CAN_H and CAN_L lines symmetrically, and its <1 pF junction capacitance prevents signal edge degradation at 1 Mbps - satisfying ISO 11898-2 requirements for physical layer robustness.
What is the maximum peak pulse current (IPPM) rating for SMCJ33CAH?
The SMCJ33CAH has a maximum peak pulse current (IPPM) rating of 29 A under the standard 10/1000 µs double-exponential surge waveform (per Fig. 5 in the datasheet). This value is derived from its 1500W peak pulse power rating and 53.3V clamping voltage (IPPM = PPK / VC = 1500W / 53.3V ≈ 28.1 A, rounded to 29 A in specification tables). It reflects single-event capability; repetitive surges require derating per Fig. 2 thermal curves.
Does SMCJ33CAH require special PCB layout considerations?
Yes - to preserve its <1.0 ps response and low-inductance clamping, SMCJ33CAH requires short, wide traces between the device and protected node, with direct connection to a solid ground plane. Avoid vias in the main current path; use dual ground connections (anode and cathode pads tied independently to ground plane) to minimize loop inductance. The recommended pad layout from TSC's Package Outline Drawing (Rev. A2102, Page 7) must be followed to ensure thermal dissipation and mechanical reliability during reflow.
SMCJ33CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- 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):
- 29A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ33CAH FAQ
1.How can I place an order for SMCJ33CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33CAH 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 SMCJ33CAH reliable?
The price and inventory of SMCJ33CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33CAH is usually 5 days.
3.What payment methods are accepted for SMCJ33CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33CAH?
SMCJ33CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33CAH 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 SMCJ33CAH?
For technical support, including SMCJ33CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33CAH requirements.
6.How does Aetrix verify that SMCJ33CAH is sourced from the original manufacturer or authorized distributors?
All SMCJ33CAH 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 SMCJ33CAH meets industry standards.
7.What is the process for return or replacement of SMCJ33CAH?
All SMCJ33CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33CAH, 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 SMCJ33CAH part is unused and in its original packaging.
Return procedure for SMCJ33CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ33CAH Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
