My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ120CAHM3/H
- Part No.:
- SMCJ120CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ120CAHM3/H.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,113
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ120CAHM3/H from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 120 V standoff voltage (VWM), 193 V maximum clamping voltage (VC) at 7.8 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with a 10/1000 μs waveform - deployed in automotive power supply rails, industrial I/O modules, and telecom interface protection.
For engineers reviewing the SMCJ120CAHM3/H datasheet, SMCJ120CAHM3/H pinout, SMCJ120CAHM3/H application, or SMCJ120CAHM3/H equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification for automotive use, halogen-free RoHS compliance (HM3 suffix), and SMC (DO-214AB) package thermal performance under repetitive surge stress.
Technical Context
This device operates as a voltage-clamped crowbar during transients: when reverse voltage exceeds the 133–147 V breakdown range (VBR at 1 mA), it enters avalanche conduction to limit downstream voltage to ≤193 V. Its bidirectional structure enables symmetrical clamping on AC-coupled or floating lines without polarity sensitivity.
Thermal design relies on low RθJL (15 °C/W) and moderate RθJA (75 °C/W), requiring minimum 8.0 mm × 8.0 mm copper pads per terminal per Vishay's derating curves. The glass-passivated junction ensures stable VBR over temperature (0.108 %/°C coefficient) and long-term reliability under repeated 10/1000 μs surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 120 V - Maximum continuous reverse operating voltage before leakage exceeds 1.0 μA; defines safe DC bias margin. |
| VBR min/max | 133 V / 147 V at 1 mA - Ensures consistent avalanche initiation across production lots and temperature. |
| VC @ IPPM | 193 V at 7.8 A - Clamping voltage under standardized 10/1000 μs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 1500 W - Peak surge energy handling capacity; supports IEC 61000-4-5 Level 4 (4 kV) compliance with proper PCB layout. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and high-ambient industrial enclosures. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
| Qualification | AEC-Q101 qualified (HM3 suffix) - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD. |
Pinout & Package
SMCJ120CAHM3/H uses the SMC (DO-214AB) surface-mount package: two-terminal, non-polarized bidirectional device with no cathode/anode 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 |
|---|---|---|
| Terminal 1 | Surge Input / Line Side | Connects to unprotected line (e.g., battery feed or data line); symmetric with Terminal 2 for bidirectional clamping. |
| Terminal 2 | Surge Return / Load Side | Connects to protected IC or load; forms low-inductance path to shunt surge energy away from sensitive nodes. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled, differential, or floating signal paths without polarity constraints. |
| AEC-Q101 qualification | Validates robustness for automotive powertrain and body electronics where failure modes must meet ISO 26262 ASIL readiness. |
| Halogen-free & RoHS-compliant (HM3) | Meets EU ELV and China RoHS requirements; eliminates brominated flame retardants in molding compound. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a/5a), improving system immunity. |
| MSL Level 1 rating | Allows unlimited floor life and reflow up to 260 °C peak - simplifies manufacturing without baking or dry-pack requirements. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump (ISO 16750-2) and alternator ripple. IC Role / Device Role: Primary TVS clamp on main power rail upstream of DC/DC converter input. Use Value: Limits transient voltage to ≤193 V, preventing damage to 36 V-rated input stages while surviving 1500 W surges. | Use Scenario: Shielding 4–20 mA current loop inputs from ESD and field wiring surges in PLC analog modules. IC Role / Device Role: Bidirectional line protector between terminal block and precision ADC front-end. Use Value: Symmetrical clamping preserves signal integrity on floating differential pairs; 1.0 μA leakage avoids current-loop error. |
| Telecom Data Line Protection | Consumer Power Adapter Output |
Use Scenario: Safeguarding RS-485 transceivers connected to outdoor cabling exposed to lightning-induced surges. IC Role / Device Role: Secondary protection stage after gas discharge tube (GDT), placed adjacent to transceiver pins. Use Value: 193 V clamping aligns with RS-485 common-mode range (±12 V) + safety margin; fast response (<1 ns) prevents latch-up. | Use Scenario: Overvoltage suppression on 12 V DC output of wall-mounted adapters used in smart home hubs. IC Role / Device Role: Final-stage TVS on output connector to prevent user-induced short-circuit transients from damaging downstream SoCs. Use Value: 120 V VWM provides ample margin above nominal 12 V output; SMC package withstands reflow and mechanical stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC120CA | Lower PPPM (600 W), same VWM (120 V), smaller SMA package (DO-214AC). | Limited to lower-energy threats (IEC 61000-4-2 ±8 kV contact); unsuitable for load dump or IEC 61000-4-5. | Select when board space is constrained and surge threat level is limited to ESD only. |
| SMCJ120AHE3/H | Unidirectional variant; identical VWM, VBR, VC, and PPPM; commercial-grade (non-AEC-Q101), RoHS-compliant E3 suffix. | Requires correct polarity placement; not rated for automotive under-hood use. | Choose for cost-sensitive industrial or consumer designs where AEC-Q101 is unnecessary and polarity is controlled. |
Compared with SAC120CA and SMCJ120AHE3/H, the SMCJ120CAHM3/H uniquely combines 1500 W surge capability, bidirectional symmetry, AEC-Q101 qualification, and halogen-free construction - making it the only option qualified for automotive power rail protection under ISO 16750-2 and IEC 61000-4-5 Level 4.
Availability
SMCJ120CAHM3/H is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, telecom base station interfaces, and consumer power adapter outputs requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ120CAHM3/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, MOSFETs, and protection devices with emphasis on high-reliability, high-power, and automotive-qualified components.
The SMCJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where sustained surge immunity and AEC-Q101 validation are mandatory.
FAQ
What does the 'CA' suffix indicate in SMCJ120CAHM3/H?
The 'CA' suffix in SMCJ120CAHM3/H denotes a bidirectional configuration, meaning the device provides symmetrical transient voltage clamping in both polarities. This allows it to protect AC-coupled circuits, differential signal lines, or floating power domains without regard to voltage polarity - unlike unidirectional variants (e.g., SMCJ120A) which require correct anode/cathode orientation. Electrical characteristics such as VBR, VC, and IPPM apply identically in either direction.
Is SMCJ120CAHM3/H suitable for automotive under-hood applications?
Yes, SMCJ120CAHM3/H is AEC-Q101 qualified (indicated by the 'HM3' suffix) and rated for junction temperatures up to +150 °C, making it suitable for under-hood automotive applications including engine control modules, body control units, and ADAS power supplies. Its glass-passivated junction, MSL Level 1 rating, and validated performance under temperature cycling and humidity testing confirm its suitability for demanding automotive environments.
How does the SMC (DO-214AB) package of SMCJ120CAHM3/H affect thermal performance?
The SMC (DO-214AB) package of SMCJ120CAHM3/H delivers a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W, enabling efficient heat transfer to PCB copper. When mounted on 8.0 mm × 8.0 mm pads per terminal, it achieves adequate thermal derating for 1500 W surges. However, its RθJA of 75 °C/W means ambient temperature rise must be managed - especially in enclosed automotive or industrial enclosures - to avoid exceeding the +150 °C TJ max under repetitive surge conditions.
What is the significance of the 'HM3' suffix in SMCJ120CAHM3/H?
'HM3' in SMCJ120CAHM3/H indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. The 'H' denotes the AEC-Q101 grade, 'M' specifies halogen-free molding compound, and '3' confirms RoHS compliance. This suffix ensures the device meets automotive reliability standards (including HTGB, HTRB, and TC) while complying with environmental regulations like EU ELV and China RoHS - critical for Tier 1 suppliers and OEMs requiring full material declarations.
Can SMCJ120CAHM3/H replace SMCJ120AHE3/H in an existing design?
No direct replacement: SMCJ120CAHM3/H is bidirectional and AEC-Q101 qualified, whereas SMCJ120AHE3/H is unidirectional and commercial-grade. Swapping requires verifying polarity alignment, reassessing surge threat models (e.g., load dump demands bidirectional clamping), and confirming AEC-Q101 compliance is required. Layout changes may be needed if the original design relied on cathode band orientation - SMCJ120CAHM3/H has no polarity marking. Always validate clamping behavior under actual surge waveforms.
SMCJ120CAHM3/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):
- 120V
- Voltage - Breakdown (Min):
- 133V
- Voltage - Clamping (Max) @ Ipp:
- 193V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- 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)
SMCJ120CAHM3/H FAQ
1.How can I place an order for SMCJ120CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ120CAHM3/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 SMCJ120CAHM3/H reliable?
The price and inventory of SMCJ120CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ120CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ120CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ120CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ120CAHM3/H?
SMCJ120CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ120CAHM3/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 SMCJ120CAHM3/H?
For technical support, including SMCJ120CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ120CAHM3/H requirements.
6.How does Aetrix verify that SMCJ120CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ120CAHM3/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 SMCJ120CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMCJ120CAHM3/H?
All SMCJ120CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ120CAHM3/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 SMCJ120CAHM3/H part is unused and in its original packaging.
Return procedure for SMCJ120CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ120CAHM3/H 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
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
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 …
