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Vishay General Semiconductor - Diodes Division SMBJ120CAHE3/52
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- Part No.:
- SMBJ120CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ120CAHE3/52.pdf
- Description:
- TVS DIODE 120VWM 193VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,448
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Product details
Overview
SMBJ120CAHE3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 120 V standoff voltage (VWM), 133–147 V breakdown range (VBR), 600 W peak pulse power (10/1000 μs), clamping voltage of 193 V at 3.1 A IPPM, and operates across -55 °C to +150 °C junction temperature.
For engineers reviewing the SMBJ120CAHE3/52 datasheet, SMBJ120CAHE3/52 pinout, SMBJ120CAHE3/52 application, or SMBJ120CAHE3/52 equivalent, this device is selected for high-reliability transient suppression in automotive-grade power rails, industrial sensor interfaces, and telecom line protection where AEC-Q101 qualification, low clamping ratio, and MSL Level 1 solderability are required.
Technical Context
This bidirectional TVS diode functions as a voltage-clamped shunt protector-triggering when reverse (or forward) transients exceed its breakdown threshold and diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 μA at VWM), while the low incremental surge resistance enables effective energy absorption without thermal runaway.
The device complies with ANSI/IEEE C62.35 standards for transient suppressors and meets UL 497B recognition (QVGQ2). Its AEC-Q101 qualification confirms suitability for automotive applications, and its DO-214AA package supports automated placement with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 120 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (Breakdown Voltage) | 133–147 V at 1 mA - Confirmed minimum/maximum threshold where avalanche conduction initiates under standardized test conditions. |
| VC (Clamping Voltage) | 193 V at IPPM = 3.1 A - Peak voltage seen across protected circuit during 10/1000 μs surge; determines maximum stress on downstream components. |
| PPPM (Peak Pulse Power) | 600 W - Sustained surge energy handling capability per single 10/1000 μs waveform; validates protection against common lightning/inductive spikes. |
| ID (Reverse Leakage) | ≤1.0 μA at VWM - Minimal standby current draw ensuring negligible power loss and signal integrity in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature rating enabling operation in under-hood automotive or industrial ambient environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 0.205" x 0.130" footprint; compatible with IPC-7351B land patterns and reflow profiles up to 260 °C peak. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (bidirectional) | Accepts surge current in either polarity; connects to protected line or rail requiring clamping. |
| Cathode | Transient current entry (bidirectional) | Identical functional role to Anode; device conducts identically in both directions - no cathode band marking. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive powertrain and body electronics per stress test requirements including HTOL, TCT, and ESD. |
| 600 W peak pulse power (10/1000 μs) | Handles typical ISO 7637-2 pulse 1/2/5a surges without degradation; supports repeated transient events at 0.01% duty cycle. |
| MSL Level 1 (260 °C peak) | Enables standard lead-free reflow assembly without moisture sensitivity concerns or baking requirements. |
| Glass-passivated junction | Ensures stable VBR tolerance over time and temperature; reduces parameter drift in long-life industrial deployments. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during clamping - critical for protecting 120 V-rated MOSFETs and gate drivers. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs and lighting modules from load dump and alternator transients per ISO 7637-2. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between power rail and ground, clamping surges within microseconds. Use Value: Maintains system uptime by limiting rail voltage to ≤193 V during 100 V/100 ms load dump events, preventing MOSFET avalanche failure. |
Use Scenario: Safeguarding analog input channels of PLC I/O modules connected to field sensors exposed to EMI and cable-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamp on differential or single-ended signal lines (e.g., 4–20 mA, RS-485 stubs). Use Value: Prevents ADC saturation and op-amp latch-up by clamping ±193 V transients while adding <1 pF capacitance at signal frequencies. |
| Telecom Line Surge Protection | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Front-end protection for PoE-powered Ethernet switches and DSL line cards subjected to lightning-induced longitudinal surges. IC Role / Device Role / Timing Role: Primary-level TVS on tip/ring pairs, coordinated with GDTs and PTCs in multi-stage architecture. Use Value: Absorbs 600 W surge energy without follow-on current, enabling coordination with secondary protectors and preserving signal integrity. |
Use Scenario: Suppressing inductive kickback from brushed DC motors in smart home appliances (e.g., vacuum cleaners, power tools). IC Role / Device Role / Timing Role: Parallel-mounted across motor terminals or H-bridge outputs to clamp flyback voltage spikes. Use Value: Extends MOSFET lifetime by limiting drain-source voltage to 193 V during 30 A turn-off events, reducing avalanche stress cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120CA-M3/52 | Halogen-free, RoHS-compliant variant; identical electrical specs and AEC-Q101 qualification. | No difference in protection performance or automotive use case; differs only in material composition compliance. | Select when halogen-free BOM requirements apply; otherwise functionally interchangeable with SMBJ120CAHE3/52. |
| SMCJ120CAHE3/A | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; 1500 W PPPM rating. | Higher power handling suits systems with >600 W surge exposure (e.g., heavy-duty industrial drives); requires larger PCB area. | Choose when higher surge margin is needed and board space allows SMC footprint; not pin-compatible due to different package dimensions. |
Compared with SMBJ120CAHE3/52, the M3 variant offers identical protection performance with halogen-free materials, while the SMCJ120CAHE3/A delivers 2.5× higher surge power in a physically larger package - selection depends on compliance mandates and system-level surge threat level, not pin compatibility.
Availability
SMBJ120CAHE3/52 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom infrastructure requiring stable component supply with AEC-Q101 validation and full traceability.
Supply support for SMBJ120CAHE3/52 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, TVS devices, and optoelectronics with emphasis on reliability and application-specific performance.
The SMBJ series was engineered for high-energy transient suppression in space-constrained, high-reliability applications-including automotive, industrial automation, and communications-where consistent clamping, low leakage, and AEC-Q101 compliance are mandatory.
FAQ
What is the clamping voltage of SMBJ120CAHE3/52 at its rated peak pulse current?
The SMBJ120CAHE3/52 has a maximum clamping voltage (VC) of 193 V at its rated peak pulse current (IPPM) of 3.1 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs and MOSFETs remain within safe operating area.
Is SMBJ120CAHE3/52 suitable for automotive applications?
Yes, SMBJ120CAHE3/52 is AEC-Q101 qualified and explicitly designated for automotive use via its "HE3" suffix. It undergoes stress testing for high-temperature operating life, temperature cycling, and ESD robustness - making it appropriate for engine control units, body electronics, and infotainment power rails where reliability under harsh conditions is essential.
How does the bidirectional configuration of SMBJ120CAHE3/52 affect its circuit implementation?
The bidirectional configuration of SMBJ120CAHE3/52 means it provides symmetrical clamping for both positive and negative transients without polarity sensitivity - ideal for AC-coupled lines, differential buses (e.g., RS-485), or ungrounded DC rails. Unlike unidirectional variants, SMBJ120CAHE3/52 has no cathode band marking and can be mounted in either orientation on PCB.
What is the thermal resistance of SMBJ120CAHE3/52, and how does it impact power dissipation?
SMBJ120CAHE3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W. These values indicate that sustained power dissipation above 5.0 W (its rated PD) will cause rapid junction temperature rise - confirming its design intent for transient-only energy absorption, not continuous power handling.
Does SMBJ120CAHE3/52 require special PCB layout considerations?
Yes - Vishay specifies mounting on 0.2" x 0.2" (5.0 mm x 5.0 mm) copper pads per terminal to achieve rated PPPM and thermal performance. Narrow traces or insufficient copper reduce surge current capacity and increase localized heating; use short, wide traces and avoid vias in the main surge path to maintain low-inductance clamping response.
SMBJ120CAHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- 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):
- 3.1A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMBJ)
SMBJ120CAHE3/52 FAQ
1.How can I place an order for SMBJ120CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ120CAHE3/52 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 SMBJ120CAHE3/52 reliable?
The price and inventory of SMBJ120CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ120CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ120CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ120CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ120CAHE3/52?
SMBJ120CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ120CAHE3/52 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 SMBJ120CAHE3/52?
For technical support, including SMBJ120CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ120CAHE3/52 requirements.
6.How does Aetrix verify that SMBJ120CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ120CAHE3/52 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 SMBJ120CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ120CAHE3/52?
All SMBJ120CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ120CAHE3/52, 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 SMBJ120CAHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ120CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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