My Inquiry
My Account
Alpha & Omega Semiconductor Inc. SMDJ120CA
- Part No.:
- SMDJ120CA
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ120CA.pdf
- Description:
- 1CH 120V BIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:9,700
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMDJ120CA from Alpha & Omega Semiconductor is a bi-directional transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 120 V reverse standoff voltage (VRWM), 133–147 V breakdown voltage (VBR @ 1 mA), 193 V maximum clamping voltage (VC @ IPPM), 3000 W peak pulse power (10/1000 µs), and DO-214AB (SMC) surface-mount package - deployed in industrial motor drives to protect IGBT gate drivers from inductive switching transients.
For engineers reviewing the SMDJ120CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping capability, low leakage (<2 µA @ 120 V), fast sub-1 ps response time, JEDEC DO-214AB thermal performance (RθJA = 75 °C/W), and compatibility with automated SMT assembly per J-STD-020 MSL Level 1.
Technical Context
The SMDJ120CA operates as a silicon avalanche diode optimized for unidirectional or bidirectional transient suppression without series impedance. Its glass-passivated junction ensures stable VBR tolerance (±5% typical) and low temperature coefficient (0.1% × VBR/°C), enabling predictable clamping across –55 °C to +150 °C operating range.
It delivers 3000 W peak pulse power on standardized 10/1000 µs waveform when mounted on 8.0 mm × 8.0 mm copper pads, with 150.8 A peak pulse current (IPPM) and 300 A non-repetitive forward surge rating (IFSM, 8.3 ms half-sine). Clamping occurs within <1.0 ps from 0 V to breakdown, minimizing voltage overshoot during ESD or lightning-induced surges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 120 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR @ IT=1 mA | 133–147 V - Confirmed breakdown range ensuring reliable turn-on margin above VRWM |
| VC @ IPPM | 193 V - Clamped voltage at 150.8 A pulse, limiting downstream component stress |
| PPPM (10/1000 µs) | 3000 W - Surge energy handling capacity for industrial-level lightning and inductive spikes |
| IR @ VRWM | <2 µA - Negligible leakage current preserving system efficiency in standby mode |
| TJ max / TSTG | –55 to +150 °C - Extended thermal range supporting under-hood and factory-floor environments |
| RθJA | 75 °C/W - Thermal resistance defining required PCB copper area for sustained power dissipation |
Pinout & Package
DO-214AB (SMC J-Bend) package: molded plastic case with matte tin lead-free plating, JEDEC-compliant outline, and cathode band marking for polarity identification. Bidirectional operation eliminates need for orientation-dependent placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Band Side) | Reference terminal for bidirectional conduction | Marked end denotes cathode for unidirectional use; in bidirectional mode (SMDJ120CA), both terminals function symmetrically as clamping nodes |
| Cathode (Opposite Band) | Reference terminal for bidirectional conduction | Electrically identical to anode in CA suffix parts; enables symmetrical clamping across differential or AC-coupled lines |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to moisture-induced parameter drift |
| Built-in strain relief | Reduces mechanical stress at lead-to-body interface during thermal cycling or board flexure |
| MSL Level 1 (260 °C peak) | Enables single-reflow soldering without pre-baking or moisture sensitivity concerns |
| UL 94V-0 flammability rating | Meets safety standards for enclosed industrial enclosures and power supply housings |
| Low-profile SMC footprint | Minimizes board space vs. through-hole TVS while maintaining 3000 W surge rating |
Applications
| Industrial Motor Drives | Telecom Power Feeds |
|---|---|
Use Scenario: Protection of gate driver ICs and isolated power supplies against IGBT turn-off transients and bus rail collapse. IC Role / Device Role: Bidirectional clamping element placed across DC bus or gate-source terminals. Use Value: Limits transient voltage to ≤193 V, preventing gate oxide rupture in 600 V IGBTs and sustaining >100,000 surge cycles per MIL-STD-883H. | Use Scenario: Surge suppression on -48 V telecom rectifier outputs exposed to lightning-induced common-mode surges. IC Role / Device Role: Primary line-side TVS in redundant power distribution units (PDUs). Use Value: Withstands 3000 W pulses without degradation, meeting ITU-T K.20 and Telcordia GR-1089-CORE requirements. |
| Renewable Energy Inverters | Automotive Battery Management |
Use Scenario: DC-link overvoltage protection in solar string inverters subjected to grid fault recovery spikes. IC Role / Device Role: Clamp device across PV input capacitors and MPPT controller inputs. Use Value: 150 °C max junction temperature supports operation inside sealed outdoor enclosures with no forced cooling. | Use Scenario: Transient suppression on 12 V battery monitoring lines in EV battery packs exposed to load dump events. IC Role / Device Role: Secondary protection stage after primary fuse and relay disconnect. Use Value: Fast <1 ps response captures initial edge of ISO 7637-2 Pulse 5a (load dump), limiting voltage to safe levels for analog front-end ICs. |
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 (Littelfuse) | Same DO-214AB package, 120 V VRWM, but lower PPPM (1500 W) and higher VC (200 V) | Rated for lower-energy surges; suitable where IEC 61000-4-5 Level 3 (2 kV) suffices | Select SMDJ120CA when 3000 W surge handling per IEC 61000-4-5 Level 4 is required |
| 1.5KE120CA (ON Semiconductor) | Through-hole DO-15 package, same electrical specs but incompatible with SMT assembly | Requires manual or wave-solder rework; not viable for high-volume automated production | Choose SMDJ120CA to eliminate secondary assembly steps and reduce board real estate |
Compared with SAC120CA and 1.5KE120CA, the SMDJ120CA provides double the peak pulse power in an SMT-compatible package with tighter VBR tolerance and lower clamping voltage - directly enabling higher system reliability in space-constrained, high-surge industrial designs.
Availability
SMDJ120CA is available at Aetrix Electronics and suitable for industrial motor drives, telecom power feeds, and renewable energy inverters requiring stable component supply, RoHS-compliant green packaging, and traceable lot-level sourcing.
Supply support for SMDJ120CA 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
Alpha & Omega Semiconductor (AOS) is a fabless power semiconductor company specializing in high-efficiency MOSFETs, TVS diodes, and power modules for industrial, computing, and consumer markets.
The SMDJ series is engineered for robust transient suppression in high-power DC systems, emphasizing low clamping ratio, repeatable surge endurance, and seamless integration into automated SMT lines.
FAQ
What is the clamping voltage of the SMDJ120CA under maximum rated surge current?
The SMDJ120CA exhibits a maximum clamping voltage (VC) of 193 V when subjected to its peak pulse current (IPPM) of 150.8 A on a 10/1000 µs waveform. This value is measured at TJ = 25 °C with specified PCB mounting conditions (8.0 mm × 8.0 mm copper pads), and defines the upper voltage limit imposed on protected circuitry during worst-case transients.
Is the SMDJ120CA suitable for bidirectional signal line protection?
Yes, the SMDJ120CA is explicitly designed for bidirectional operation, as indicated by the "CA" suffix. Its electrical characteristics apply identically in both directions, making it appropriate for protecting AC-coupled data lines, differential buses like RS-485, or any interface where polarity reversal or common-mode surges may occur - unlike unidirectional "A" variants.
What is the thermal resistance of the SMDJ120CA, and how does it affect layout design?
The SMDJ120CA has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on standard 8.0 mm × 8.0 mm copper pads. To maintain TJ ≤ 150 °C during repetitive surges, PCB layout must allocate sufficient copper area and consider thermal vias - especially critical in enclosed or high-ambient-temperature environments where derating applies.
Does the SMDJ120CA meet industry-standard surge immunity requirements?
Yes, the SMDJ120CA's 3000 W peak pulse power rating on the 10/1000 µs waveform aligns with IEC 61000-4-5 Level 4 (4 kV line-earth, 2 kV line-line) test requirements. Its fast <1.0 ps response time and low clamping ratio ensure compliance in systems requiring robust protection against lightning-induced surges and switching transients.
How does the SMDJ120CA differ from the unidirectional SMDJ120A variant?
The SMDJ120CA is bidirectional with symmetrical clamping in both polarities, while the SMDJ120A is unidirectional and conducts only when reverse-biased. The CA version uses identical DO-214AB packaging but omits directional dependency - enabling use in AC or floating circuits without polarity constraints. Both share identical VRWM, VBR, and PPPM ratings.
SMDJ120CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 15.6A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB
SMDJ120CA FAQ
1.How can I place an order for SMDJ120CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ120CA 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 SMDJ120CA reliable?
The price and inventory of SMDJ120CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ120CA is usually 5 days.
3.What payment methods are accepted for SMDJ120CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ120CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ120CA?
SMDJ120CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ120CA 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 SMDJ120CA?
For technical support, including SMDJ120CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ120CA requirements.
6.How does Aetrix verify that SMDJ120CA is sourced from the original manufacturer or authorized distributors?
All SMDJ120CA 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 SMDJ120CA meets industry standards.
7.What is the process for return or replacement of SMDJ120CA?
All SMDJ120CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ120CA, 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 SMDJ120CA part is unused and in its original packaging.
Return procedure for SMDJ120CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ120CA 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…
