My Inquiry
My Account
Alpha & Omega Semiconductor Inc. SMDJ20CA
- Part No.:
- SMDJ20CA
- Manufacturer:
- Alpha & Omega Semiconductor Inc.
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ20CA.pdf
- Description:
- 1CH 20V BIDIRECTIONAL 3000W SMD
- Quantity:
- Payment:
- Shipping:
Inventory:7,403
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMDJ20CA from Alpha & Omega Semiconductor is a bi-directional transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power lines and signal interfaces. It features a 20.0 V reverse stand-off voltage (VRWM), 22.2–24.5 V breakdown voltage (VBR) at 1 mA, 32.4 V maximum clamping voltage (VC) at 92.6 A peak pulse current, and 3000 W peak pulse power dissipation on a 10/1000 µs waveform - deployed in industrial motor drives to protect IGBT gate drivers from inductive switching transients.
For engineers reviewing the SMDJ20CA datasheet, pinout, applications, or equivalent options, key selection criteria include bidirectional clamping symmetry, low thermal resistance (RθJL = 15 °C/W), JEDEC DO-214AB package compatibility with automated SMT assembly, and compliance with IEC 61000-4-2/4-5 surge immunity requirements.
Technical Context
The SMDJ20CA operates as a silicon avalanche diode with glass-passivated junction and bidirectional conduction capability - enabling symmetrical clamping of positive and negative transients without polarity sensitivity. Its fast response time (<1.0 ps) ensures suppression before sensitive downstream circuitry is stressed, while its 0.01% duty cycle rating supports infrequent but high-energy surge events.
Thermally, it is rated for -55°C to +150°C operating junction temperature, with RθJA = 75 °C/W (on 8.0 mm × 8.0 mm copper pads) and RθJL = 15 °C/W, allowing reliable power derating in compact PCB layouts. The device meets J-STD-020 MSL Level 1 and UL 94V-0 flammability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VRWM | 20.0 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for protected line. |
| VBR @ IT=1 mA | 22.2–24.5 V - Measured breakdown range confirming tight tolerance for predictable clamping onset. |
| VC @ IPPM | 32.4 V at 92.6 A - Clamped voltage during 10/1000 µs surge; determines maximum stress seen by downstream ICs. |
| PPPM | 3000 W - Peak pulse power handling on standard 10/1000 µs waveform; enables robust Class 4 IEC 61000-4-5 compliance. |
| IR @ VRWM | ≤2.0 µA - Low leakage ensures minimal quiescent power loss and no interference with high-impedance sensing nodes. |
| TJ max | +150 °C - Enables operation in under-hood automotive or enclosed industrial enclosures without forced cooling. |
| Package | DO-214AB (SMC J-Bend) - Standardized surface-mount outline with strain relief and matte tin lead-free plating for RoHS-compliant reflow. |
Pinout & Package
DO-214AB (SMC J-Bend) package: molded plastic case with J-bent leads, cathode band marking for unidirectional variants; for SMDJ20CA (bi-directional), polarity is non-applicable - both terminals are functionally symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction terminal | Either terminal accepts positive or negative transient energy; no polarity-dependent mounting required. |
| Case | Non-connected plastic body | No thermal or electrical connection to PCB ground plane; thermal path is solely via soldered leads. |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating differential lines (e.g., RS-485, CAN bus) without external polarity management. |
| 3000 W peak pulse power | Supports direct integration into 48 V DC bus protection schemes meeting IEC 61000-4-5 Level 4 (4 kV surge) without series impedance. |
| Fast response time <1.0 ps | Clamps transients before propagation into microcontroller GPIO or analog front-end stages, reducing need for secondary filtering. |
| MSL Level 1 / 260 °C reflow compatible | Eliminates pre-baking requirement and supports standard lead-free SMT processes without moisture-induced failure risk. |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure in industrial environments. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate driver ICs and bootstrap circuits against inductive kickback from BLDC motor phase switching. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed across gate-source terminals or supply rails. Use Value: Limits transient overvoltage to ≤32.4 V, preventing gate oxide rupture in 600 V IGBTs and ensuring >100,000-cycle reliability under 40 A switching currents. |
Use Scenario: Surge suppression on LIN bus and sensor supply lines exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12 V distribution network feeding door module ECUs. Use Value: Withstands 3000 W pulses per ISO 7637-2 Pulse 5a, maintaining <2 µA leakage to avoid battery drain in sleep mode. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: DC input protection for PoE-powered remote radios subjected to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Front-end TVS on 48 V DC feed prior to DC-DC converter input stage. Use Value: Clamps 10/1000 µs surges to ≤32.4 V while dissipating 3 kW, preserving converter MOSFETs rated for 65 V absolute maximum. |
Use Scenario: DC link overvoltage suppression in solar string inverters during rapid irradiance changes or grid fault recovery. IC Role / Device Role / Timing Role: Parallel-mounted TVS across 600–1000 V DC bus capacitors. Use Value: Provides fail-safe clamping when active crowbar circuits are unavailable; validated for 150 °C ambient operation inside sealed inverter enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC20CA (Littelfuse) | Same DO-214AB package, identical VRWM (20 V), but higher VC = 34.0 V at 90 A; slightly lower PPPM = 2500 W. | Marginally reduced clamping performance may require additional RC snubbing in high-dV/dt gate drive paths. | Select when cost sensitivity outweighs 1.6 V clamping advantage and system-level testing confirms adequate margin. |
| P6SMB20CA (ON Semiconductor) | DO-214AA (SMB) package - smaller footprint but higher RθJA (100 °C/W); same VRWM/VBR/VC specs; PPPM = 600 W (not 3000 W). | Not suitable for high-energy surge scenarios; limited to low-power signal lines or secondary-stage protection. | Choose only for space-constrained signal-level protection where 3000 W capability is unnecessary. |
Compared with SAC20CA and P6SMB20CA, the SMDJ20CA delivers superior energy handling (3000 W vs. 2500 W/600 W) and tighter thermal resistance (RθJL = 15 °C/W), making it the preferred choice for primary DC bus protection in high-reliability industrial and automotive power systems.
Availability
SMDJ20CA is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power feeds requiring stable component supply, long-lifecycle support, and full traceability through AEC-Q200-aligned manufacturing.
Supply support for SMDJ20CA 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, IGBTs, and protection devices for power conversion and management.
The SMDJxxxA/CA series was engineered specifically for high-power transient suppression in harsh-environment applications - emphasizing rugged packaging, repeatable clamping, and compatibility with automated SMT assembly in automotive and industrial production.
FAQ
What is the clamping voltage of the SMDJ20CA under a 10/1000 µs surge?
The SMDJ20CA exhibits a maximum clamping voltage (VC) of 32.4 V when subjected to its rated peak pulse current of 92.6 A on a 10/1000 µs waveform. This value is measured per industry-standard test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring compatibility with 36 V-rated downstream components. The SMDJ20CA maintains this clamping performance across its full operating temperature range.
Is the SMDJ20CA suitable for bidirectional signal line protection?
Yes, the SMDJ20CA is explicitly designed as a bi-directional TVS diode, indicated by the "CA" suffix. Its symmetrical avalanche structure provides matched clamping in both polarities, making it ideal for protecting AC-coupled or floating interfaces such as RS-485, CAN FD, and Ethernet PHY lines. Unlike unidirectional variants, the SMDJ20CA requires no orientation during placement and delivers identical VBR and VC in either direction.
What is the thermal resistance from junction to lead (RθJL) for the SMDJ20CA?
The SMDJ20CA has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W, measured under standardized test conditions. This low value reflects efficient heat transfer from the silicon die directly into the soldered leads, enabling effective power dissipation during transient events without requiring large copper planes. That RθJL value is essential for calculating safe steady-state derating and verifying thermal integrity in high-ambient-temperature deployments of the SMDJ20CA.
Does the SMDJ20CA meet automotive reflow standards?
Yes, the SMDJ20CA is qualified to J-STD-020 MSL Level 1 and supports peak reflow temperatures up to 260 °C, fully compliant with lead-free soldering profiles used in automotive electronics manufacturing. Its matte tin lead-free plating and glass-passivated junction ensure reliability through multiple reflow cycles without degradation in VBR or leakage - a verified characteristic of the SMDJ20CA in AEC-Q200-aligned production lots.
How does the SMDJ20CA compare to the SMDJ20A in terms of application use?
The SMDJ20CA is bi-directional, while the SMDJ20A is unidirectional - meaning the SMDJ20CA clamps transients of either polarity across its terminals, whereas the SMDJ20A only clamps in reverse bias and conducts forward current if overvolted. This makes the SMDJ20CA appropriate for AC or floating nodes (e.g., differential buses), while the SMDJ20A suits DC supply rail protection with defined polarity. Both share identical VRWM, VBR, VC, and PPPM ratings, but their circuit roles differ fundamentally - a distinction confirmed in the official Alpha & Omega Semiconductor datasheet for the SMDJ20CA.
SMDJ20CA 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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 92.6A
- 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
SMDJ20CA FAQ
1.How can I place an order for SMDJ20CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ20CA 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 SMDJ20CA reliable?
The price and inventory of SMDJ20CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ20CA is usually 5 days.
3.What payment methods are accepted for SMDJ20CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ20CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ20CA?
SMDJ20CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ20CA 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 SMDJ20CA?
For technical support, including SMDJ20CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ20CA requirements.
6.How does Aetrix verify that SMDJ20CA is sourced from the original manufacturer or authorized distributors?
All SMDJ20CA 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 SMDJ20CA meets industry standards.
7.What is the process for return or replacement of SMDJ20CA?
All SMDJ20CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ20CA, 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 SMDJ20CA part is unused and in its original packaging.
Return procedure for SMDJ20CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ20CA 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
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…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
