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Taiwan Semiconductor Corporation SMDJ20AH
- Part No.:
- SMDJ20AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ20AH.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,591
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Product details
Overview
SMDJ20AH from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode with a 20V working stand-off voltage, 22.2–24.5V breakdown voltage at 1mA test current, and 32.4V maximum clamping voltage at 92.6A peak pulse current. It is AEC-Q101 qualified and designed for automotive and industrial ESD/EMI protection in power supply rails and signal lines.
For engineers reviewing the SMDJ20AH datasheet, SMDJ20AH pinout, SMDJ20AH application, or SMDJ20AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, thermal resistance (RθJA = 75°C/W), DO-214AB (SMC) package compatibility, and unidirectional surge handling up to 300A IFSM.
Technical Context
The SMDJ20AH operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-1ps response time and stable clamping during fast transients. Its 3000W peak pulse power rating (tp = 1ms) is defined per the 10/1000μs waveform per R.E.A., with derating above 25°C ambient per Fig.2.
It meets automotive-grade reliability requirements including JESD201 Class 2 whisker resistance, moisture sensitivity level 1 (J-STD-020), and UL 94V-0 molding compound. The device supports bidirectional variants via CAH suffix (e.g., SMDJ20CAH), but SMDJ20AH itself is strictly unidirectional with cathode band marking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before leakage exceeds 5 µA |
| VBR @ IT=1mA | 22.2–24.5 V - Breakdown threshold range ensuring reliable turn-on during overvoltage events |
| VC @ IPPM=92.6A | 32.4 V - Clamped voltage seen by protected circuit under full 3000W transient load |
| PPK | 3000 W - Peak pulse power handling capability per 1ms non-repetitive 10/1000μs waveform |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance defining PCB heatsinking requirements |
| IFSM | 300 A - Peak forward surge current tolerance for 8.3ms half-sine wave, critical for load-dump immunity |
| TJ max | +175 °C - Maximum junction temperature enabling operation in under-hood automotive environments |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, single-die unidirectional configuration with cathode band marking. Matte tin-plated leads, RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; conducts during positive surges when cathode is biased higher |
| Cathode | Clamping reference terminal | Marked with band; connected to higher-potential rail (e.g., VIN); defines clamping polarity and directionality |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics use, including temperature cycling, humidity bias, and mechanical shock testing |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Sub-1ps response time | Enables effective suppression of ESD events (IEC 61000-4-2) before sensitive ICs are damaged |
| DO-214AB (SMC) footprint | Standardized 7.11 × 6.22 mm outline compatible with automated pick-and-place and reflow processes |
Applications
| Automotive Power Rail Protection | Industrial DC Power Input |
|---|---|
Use Scenario: Protecting 24V battery-fed ECUs against load dump and alternator transients per ISO 7637-2 Pulse 5a/5b. IC Role / Device Role / Timing Role: Unidirectional TVS clamping high-energy surges on main power input before DC-DC converters. Use Value: Limits voltage to ≤32.4V during 3000W transients, preventing damage to downstream regulators rated for <40V input. | Use Scenario: Safeguarding programmable logic controllers (PLCs) powered from 24V industrial supplies exposed to relay coil flyback and motor switching noise. IC Role / Device Role / Timing Role: Fast-acting shunt protector absorbing repetitive 8.3ms surges up to 300A without degradation. Use Value: Maintains system uptime by eliminating field failures caused by cumulative transient-induced latch-up in microcontrollers. |
| Telecom Line Interface | Consumer Equipment DC Jack |
Use Scenario: Shielding Ethernet PHY power pins and auxiliary rails in PoE-powered switches from induced lightning surges. IC Role / Device Role / Timing Role: Primary-level surge clamp on +3.3V/+5V bias rails feeding magnetics and PHY ICs. Use Value: Achieves <500V surge immunity (per IEC 61000-4-5) while maintaining low leakage (<5µA) during normal operation. | Use Scenario: ESD and surge protection at the DC barrel jack of smart home hubs and set-top boxes connected to wall adapters. IC Role / Device Role / Timing Role: First-line defense against human-body-model (HBM) ESD and adapter plug-in transients. Use Value: Survives >30kV contact discharge (IEC 61000-4-2) with clamping below IC absolute maximum ratings, avoiding costly field returns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ20A | Same DO-214AC (SMA) package; lower PPK = 400W; VC = 32.4V @ 12.3A | Not suitable for 3000W ISO 7637-2 Pulse 5; limited to low-energy ESD and signal-line protection | Select SMDJ20AH when full automotive load-dump immunity is required; SMAJ20A only for cost-sensitive consumer signal paths. |
| ON Semiconductor 1.5SMC20A | DO-214AB (SMC) package; PPK = 1500W; VC = 32.4V @ 46.3A; RθJA = 80°C/W | Insufficient for 3000W transients; requires parallel devices or derating for automotive use | SMDJ20AH delivers double the peak power in same footprint-critical for single-device compliance with OEM surge specs. |
Compared with SMAJ20A and 1.5SMC20A, the SMDJ20AH provides 3000W clamping in the industry-standard SMC package with superior thermal resistance (75°C/W vs. ≥80°C/W), enabling robust single-device protection for automotive and industrial 24V systems without layout redesign.
Availability
SMDJ20AH is available at Aetrix Electronics and suitable for automotive control units, industrial PLC power inputs, and telecom line interfaces requiring stable component supply and AEC-Q101-compliant surge protection.
Supply support for SMDJ20AH 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and automotive-qualified components.
The SMDJ series was developed specifically for high-power transient suppression in harsh automotive and industrial environments, emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and surface-mount manufacturability in DO-214AB packaging.
FAQ
What is the clamping voltage of the SMDJ20AH under full-rated surge conditions?
The SMDJ20AH clamps to a maximum of 32.4 V when subjected to its rated peak pulse current of 92.6 A (corresponding to 3000 W at 1 ms). This value is measured per the 10/1000 μs waveform definition and ensures protected circuits remain within safe operating limits during ISO 7637-2 transients. The SMDJ20AH maintains this clamping performance across its specified junction temperature range of –55°C to +175°C.
Is the SMDJ20AH suitable for bidirectional transient protection?
No, the SMDJ20AH is a unidirectional TVS diode intended for DC power line protection where polarity is fixed. For bidirectional applications such as AC lines or data bus protection, the SMDJ20CAH variant must be used instead. The SMDJ20AH features a cathode band marking and conducts only in reverse breakdown; forward conduction is limited to the 3.5 V forward voltage at 100 A, not intended for bidirectional clamping.
Does the SMDJ20AH meet automotive qualification standards?
Yes, the SMDJ20AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. It also complies with JESD201 Class 2 whisker resistance, J-STD-020 moisture sensitivity level 1, and UL 94V-0 flammability-making it suitable for under-hood and body-control module applications where SMDJ20AH deployment is validated by Tier-1 automotive suppliers.
What is the thermal resistance and how does it affect PCB layout for the SMDJ20AH?
The SMDJ20AH has a junction-to-ambient thermal resistance (RθJA) of 75°C/W, meaning each watt dissipated raises the junction temperature by 75°C above ambient. To sustain repeated 3000W pulses, the PCB must provide adequate copper area and thermal vias beneath the DO-214AB (SMC) pads. Layout guidelines recommend ≥100 mm² of 2-oz copper per pad and ≥4 thermal vias (0.3mm diameter) under each terminal to maintain TJ ≤175°C during worst-case duty cycles.
How does the SMDJ20AH compare to the SMDJ20CAH in terms of electrical behavior?
The SMDJ20AH is unidirectional with one avalanche junction, while the SMDJ20CAH is bidirectional with two back-to-back junctions. Both share identical VWM (20 V), VBR (22.2–24.5 V), and VC (32.4 V) ratings, but the SMDJ20CAH exhibits symmetrical clamping in both polarities. The SMDJ20AH offers lower capacitance and faster response in DC-coupled applications, whereas the SMDJ20CAH is required for AC or floating signal lines where polarity reversal occurs.
SMDJ20AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMDJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ20AH FAQ
1.How can I place an order for SMDJ20AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ20AH 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 SMDJ20AH reliable?
The price and inventory of SMDJ20AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ20AH is usually 5 days.
3.What payment methods are accepted for SMDJ20AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ20AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ20AH?
SMDJ20AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ20AH 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 SMDJ20AH?
For technical support, including SMDJ20AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ20AH requirements.
6.How does Aetrix verify that SMDJ20AH is sourced from the original manufacturer or authorized distributors?
All SMDJ20AH 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 SMDJ20AH meets industry standards.
7.What is the process for return or replacement of SMDJ20AH?
All SMDJ20AH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ20AH, 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 SMDJ20AH part is unused and in its original packaging.
Return procedure for SMDJ20AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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