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Vishay General Semiconductor - Diodes Division SMCJ33CAHM3/H
- Part No.:
- SMCJ33CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ33CAHM3/H.pdf
- Description:
- TVS DIODE 33VWM 53.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,034
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Product details
Overview
SMCJ33CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 33 V standoff voltage (VWM), 53.3 V maximum clamping voltage (VC) at 28.1 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMCJ33CAHM3/H datasheet, SMCJ33CAHM3/H pinout, SMCJ33CAHM3/H application, or SMCJ33CAHM3/H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 75 °C/W), and real-world clamping behavior under surge transients - all critical for ESD and load-dump protection design validation.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) ranging from 36.7 V to 40.6 V at 1 mA test current and ±1.0 µA maximum reverse leakage at 33 V standoff. Its low incremental surge resistance enables fast clamping response (<1 ns), while glass-passivated junction ensures stable performance under repetitive surge stress.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (260 °C peak reflow), and is qualified to AEC-Q101 - confirming suitability for automotive under-hood and infotainment systems where reliability under thermal cycling and mechanical shock is mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 33 V - Maximum continuous reverse working voltage before clamping begins; sets upper limit for normal circuit operation. |
| VBR (min/max) | 36.7 V / 40.6 V at 1 mA - Confirmed bidirectional breakdown range; defines minimum surge threshold for reliable triggering. |
| VC @ IPPM | 53.3 V at 28.1 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected ICs. |
| PPPM | 1500 W - Peak pulse power handling capacity; supports high-energy transients like ISO 7637-2 Pulse 5a (load dump). |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads; informs derating above 25 °C ambient. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments without thermal shutdown. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated placement and reflow. |
Pinout & Package
SMCJ33CAHM3/H uses the SMC (DO-214AB) package: a two-terminal, bidirectional surface-mount device with no polarity marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional surge path | No designated anode/cathode; terminals function identically in either direction - simplifies PCB layout and eliminates orientation errors. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and body electronics - supports PPAP and long-term reliability requirements. |
| Halogen-free & RoHS-compliant | HM3 suffix confirms halogen-free molding compound and full RoHS compliance - satisfies environmental mandates for global OEM supply chains. |
| Low incremental surge resistance | Enables tighter clamping (VC = 53.3 V) at high IPPM, reducing voltage overshoot on protected MOSFET gates and microcontroller I/O pins. |
| MSL Level 1 rating | Allows unlimited floor life and peak reflow up to 260 °C - eliminates baking requirements and streamlines SMT manufacturing. |
| Glass passivated junction | Provides stable VBR tolerance and low leakage (<1 µA at VWM) over temperature and lifetime - critical for low-power sensor nodes. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs against ISO 7637-2 load dump transients (up to 60 V, 400 ms) and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional clamping device placed between power rail and ground, absorbing energy without forward conduction. Use Value: Limits rail voltage to ≤53.3 V during 28.1 A surge, preventing damage to downstream DC-DC converters and CAN transceivers. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loops) and digital I/O (e.g., RS-485) in factory automation PLC modules. IC Role / Device Role / Timing Role: Transient shunt across differential pair or single-ended line, triggered within <1 ns of overvoltage event. Use Value: Maintains signal integrity by clamping induced lightning-induced surges (IEC 61000-4-5) to safe levels below receiver input thresholds. |
| Consumer Power Adapter Input Stage | Telecom Base Station DC Feeds |
|
Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters for smart home hubs and gateways exposed to mains-borne transients. IC Role / Device Role / Timing Role: Standoff-rated protector on 5–24 V output rails, activated only during abnormal conditions. Use Value: Prevents latch-up or burnout of USB-PD controllers and PMICs by limiting transient excursions to 53.3 V with minimal capacitance impact. |
Use Scenario: Front-end protection of -48 V DC distribution in 5G remote radio units (RRUs) subject to lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Bidirectional clamp across DC feed and chassis ground, handling bipolar surges without polarity constraints. Use Value: Ensures uninterrupted operation by surviving 1500 W pulses while maintaining <1 µA leakage at nominal -48 V bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC33CA | Same VWM (33 V) and VC (53.3 V), but lower PPPM = 300 W and smaller SMA package (DO-214AC); RθJA = 120 °C/W. | Restricted to low-energy transients (e.g., ESD-only); unsuitable for load dump or IEC 61000-4-5 level 4. | Select when board space is constrained and surge energy is limited to <300 W. |
| SMCJ33CAHE3/H | Identical electrical specs and SMC package, but RoHS-compliant without halogen-free requirement (E3 vs HM3 suffix); same AEC-Q101 qualification. | No functional difference in protection performance; differs only in material compliance documentation and supply chain traceability. | Choose HM3 for halogen-free mandates (e.g., EU automotive Tier 1); E3 suffices for general industrial use. |
Compared with SAC33CA, SMCJ33CAHM3/H delivers 5× higher surge energy handling and superior thermal dissipation; versus SMCJ33CAHE3/H, it adds halogen-free assurance without compromising clamping or reliability - making it the optimal choice for high-reliability automotive and telecom deployments.
Availability
SMCJ33CAHM3/H is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom DC feed surge suppression requiring stable component supply, long-lifecycle support, and AEC-Q101 traceability.
Supply support for SMCJ33CAHM3/H 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, efficiency, and automotive-grade qualification.
The SMCJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated.
FAQ
What does the "HM3" suffix indicate in SMCJ33CAHM3/H?
The "HM3" suffix in SMCJ33CAHM3/H denotes halogen-free, RoHS-compliant construction and AEC-Q101 qualification. It confirms compliance with automotive material restrictions (e.g., IEC 61249-2-21), full RoHS adherence, and validation for mission-critical vehicle subsystems - distinct from E3 (RoHS only) or HE3 (AEC-Q101 + RoHS, not halogen-free). SMCJ33CAHM3/H meets JESD 201 Class 2 whisker resistance and MSL Level 1 reflow standards.
Is SMCJ33CAHM3/H bidirectional, and how does that affect PCB layout?
Yes, SMCJ33CAHM3/H is a bidirectional TVS diode - meaning it clamps voltage surges equally in both directions with no cathode/anode designation. This eliminates polarity marking on the SMC (DO-214AB) package and allows unrestricted orientation during placement. PCB layout requires only two pads (no silkscreen polarity indicator), reducing assembly errors and enabling symmetrical routing for differential lines or floating grounds - a key advantage over unidirectional variants like SMCJ33A.
What is the maximum clamping voltage of SMCJ33CAHM3/H, and under what test condition is it specified?
The maximum clamping voltage of SMCJ33CAHM3/H is 53.3 V, measured at a peak pulse current (IPPM) of 28.1 A using the standardized 10/1000 µs double-exponential surge waveform. This value represents the worst-case voltage seen by protected circuitry during a high-energy transient and is guaranteed across the full operating temperature range (-55 °C to +150 °C). It directly determines whether downstream components like 3.3 V or 5 V logic ICs remain within absolute maximum ratings during surge events.
How does the thermal resistance of SMCJ33CAHM3/H impact its power derating?
SMCJ33CAHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. This means each watt of steady-state power raises the junction temperature by 75 °C above ambient. Since its maximum junction temperature is +150 °C, the device must be derated above 25 °C ambient - e.g., at 85 °C ambient, maximum allowable continuous power drops to 0.87 W (calculated as (150 − 85)/75). Surge power (1500 W) is non-repetitive and thermally isolated by short duration.
Can SMCJ33CAHM3/H replace SMCJ33A in an existing design?
No - SMCJ33CAHM3/H is bidirectional, while SMCJ33A is unidirectional and features a cathode band for polarity-sensitive placement. Substituting them requires verifying circuit topology: SMCJ33CAHM3/H works only where symmetrical clamping is needed (e.g., AC lines, floating references), whereas SMCJ33A is required for DC rail protection with defined polarity. Also, SMCJ33A has different VBR (36.7–40.6 V) and VC (53.3 V) but shares identical PPPM and package. Always validate clamping behavior and layout compatibility before replacement.
SMCJ33CAHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 28.1A
- 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)
SMCJ33CAHM3/H FAQ
1.How can I place an order for SMCJ33CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ33CAHM3/H 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 SMCJ33CAHM3/H reliable?
The price and inventory of SMCJ33CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ33CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ33CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ33CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ33CAHM3/H?
SMCJ33CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ33CAHM3/H 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 SMCJ33CAHM3/H?
For technical support, including SMCJ33CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ33CAHM3/H requirements.
6.How does Aetrix verify that SMCJ33CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ33CAHM3/H 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 SMCJ33CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMCJ33CAHM3/H?
All SMCJ33CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ33CAHM3/H, 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 SMCJ33CAHM3/H part is unused and in its original packaging.
Return procedure for SMCJ33CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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