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Taiwan Semiconductor Corporation SMDJ15CAH
- Part No.:
- SMDJ15CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ15CAH.pdf
- Description:
- TVS DIODE 15VWM 24.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,129
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Product details
Overview
SMDJ15CAH from Taiwan Semiconductor is a bidirectional 3000W transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, designed for high-energy surge protection in automotive and industrial power rails. It features a working stand-off voltage of 15 V, breakdown voltage range of 16.7–18.5 V at 1 mA, clamping voltage of 24.4 V at 123 A peak pulse current, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMDJ15CAH datasheet, SMDJ15CAH pinout, SMDJ15CAH application, or SMDJ15CAH equivalent, this device is selected for robust ESD and load-dump immunity in 12 V battery-connected systems where fast response (<1.0 ps), low clamping ratio, and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance are critical.
Technical Context
The SMDJ15CAH is a glass-passivated, bipolar junction TVS diode optimized for unidirectional or bidirectional transient suppression without polarity sensitivity. Its 3000 W peak pulse power rating (10/1000 µs waveform) and 24.4 V clamping voltage at 123 A ensure effective voltage limiting during high-energy transients such as load dump or inductive switching events.
With a junction temperature range of –55 °C to +175 °C, thermal resistance of 75 °C/W (junction-to-ambient), and moisture sensitivity level 1 per J-STD-020, the SMDJ15CAH supports automated SMT placement and long-term operation in harsh under-hood or industrial control environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 15 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC rail margin for 12 V nominal systems. |
| VBR @ IT=1 mA | 16.7–18.5 V - Breakdown voltage tolerance band; ensures predictable turn-on across production lots and temperature. |
| VC @ IPPM=123 A | 24.4 V - Clamping voltage under full 3000 W surge; limits downstream IC stress to ≤2× nominal rail voltage. |
| PPK | 3000 W - Peak pulse power handling (10/1000 µs); enables protection against ISO 7637-2 Pulse 5a (load dump) up to 300 ms duration. |
| TJ max | +175 °C - Maximum junction temperature; supports operation in engine control units and power converters with minimal derating. |
| Package | DO-214AB (SMC) - Surface-mount outline with 7.11 mm × 6.22 mm footprint and 2.3 mm height; compatible with standard SMT reflow profiles. |
Pinout & Package
DO-214AB (SMC) package: bidirectional device with no anode/cathode marking requirement; terminals are symmetrical and non-polarized. Cathode band is omitted per bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals conduct identically in either direction; enables placement without orientation check on PCB. |
| Case (body) | Thermal and mechanical interface | Exposed copper slug provides low RθJL = 15 °C/W path to PCB copper; requires adequate thermal pad area per JEDEC MO-214. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS power domains. |
| ISO 7637-2 compliant | Meets Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (line impedance coupling) test requirements. |
| Fast response time | <1.0 ps junction response enables clamping before sensitive logic or analog circuitry experiences overvoltage stress. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive; suitable for green manufacturing and export-controlled programs. |
| Moisture sensitivity level 1 | No floor life limitation or baking required prior to reflow; reduces production overhead and avoids moisture-induced popcorning. |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12 V supply lines in engine control modules from load dump transients up to 40 V and 300 ms duration. IC Role / Device Role / Timing Role: Primary clamping element placed directly at connector entry point to shunt surge energy before reaching MCU or CAN transceivers. Use Value: Limits rail voltage to 24.4 V during 123 A surge, preventing latch-up or permanent damage to 3.3 V/5 V logic supplies downstream. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to absorb both positive and negative polarity transients from relay coil flyback or ESD events. Use Value: Eliminates need for separate uni-directional devices per channel, reducing BOM count and PCB space while maintaining <1.0 ps response. |
| Telecom Base Station Power | Consumer Appliance Motor Control |
Use Scenario: Securing 48 V DC power inputs in remote radio units subject to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Secondary-level TVS used after primary MOV/GDT stages to provide precise low-clamp protection for DC-DC converter front-ends. Use Value: Delivers 24.4 V clamping at 123 A with 3000 W rating-enabling tighter voltage margins than generic 33 V TVS alternatives. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machines and HVAC blowers connected to 12 V microcontroller power rails. IC Role / Device Role / Timing Role: Localized TVS mounted adjacent to motor driver IC to clamp inductive kickback before it propagates into logic supply domains. Use Value: Prevents reset or brown-out events in MCU subsystems by holding 12 V rail within ±20 % during 100 A transient events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC15CA | Lower peak power (1500 W), same VWM (15 V), higher VC (27.7 V @ 54.5 A); smaller DO-214AC (SMA) package. | Limited to lower-energy transients (e.g., ESD only); unsuitable for ISO 7637-2 Pulse 5a load dump. | Select when board space is constrained and surge energy does not exceed 1500 W. |
| SMLJ15CA | Same 3000 W rating and DO-214AB package, but VC = 24.4 V @ 123 A identical; differs in AEC-Q101 test reporting scope and thermal resistance (RθJA = 65 °C/W). | Validated for identical automotive use cases; slightly better thermal performance allows higher ambient operation. | Prefer when thermal management is critical and AEC-Q101 documentation alignment with Tier-1 OEMs is required. |
Compared with SAC15CA and SMLJ15CA, the SMDJ15CAH offers identical clamping performance and automotive qualification but with broader industry acceptance in legacy designs and documented ISO 7637-2 Pulse 1–3 compliance-making it the default choice for new 12 V system designs requiring proven surge resilience.
Availability
SMDJ15CAH is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, and telecom base station power systems requiring stable component supply and long-term lifecycle support.
Supply support for SMDJ15CAH 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers with global automotive and industrial certifications.
The SMDJ series was developed specifically for high-reliability transient suppression in 12 V and 24 V automotive electrical architectures, emphasizing AEC-Q101 compliance, ISO 7637-2 immunity, and SMT manufacturability.
FAQ
What is the maximum clamping voltage of the SMDJ15CAH under surge conditions?
The SMDJ15CAH has a maximum clamping voltage of 24.4 V when subjected to a 123 A peak pulse current (10/1000 µs waveform). This value is measured per JEDEC standards and guarantees that downstream circuitry remains within safe operating voltage limits during high-energy transients such as load dump or inductive switching events. The SMDJ15CAH maintains this clamping performance across its full operating temperature range of –55 °C to +175 °C.
Is the SMDJ15CAH suitable for bidirectional surge protection?
Yes, the SMDJ15CAH is explicitly designed as a bidirectional TVS diode, indicated by the "CAH" suffix. Its electrical characteristics-including breakdown voltage, clamping voltage, and leakage current-are symmetric in both directions. This eliminates polarity concerns during PCB layout and enables single-device protection for AC-coupled lines or differential bus interfaces like CAN or RS-485. The SMDJ15CAH achieves this without internal series diodes or external biasing.
Does the SMDJ15CAH meet automotive qualification standards?
Yes, the SMDJ15CAH is AEC-Q101 qualified and tested per ISO 7637-2 for Pulse 1, 2a, 2b, 3a, and 3b transient waveforms. It also complies with JESD201 Class 2 whisker testing and J-STD-020 moisture sensitivity Level 1. These qualifications confirm suitability for under-hood and chassis-mounted applications in passenger vehicles and commercial vehicles where reliability under thermal cycling, vibration, and electrical stress is mandatory. The SMDJ15CAH data sheet explicitly references these certifications.
What is the thermal resistance of the SMDJ15CAH, and how does it affect PCB layout?
The SMDJ15CAH has a junction-to-ambient thermal resistance (RθJA) of 75 °C/W and a junction-to-lead resistance (RθJL) of 15 °C/W. To maintain safe operation at full 3000 W surge rating, the PCB must include a minimum 100 mm² copper thermal pad connected to both terminals, with at least two internal ground/power planes. Insufficient copper area increases junction temperature beyond the +175 °C limit, risking parametric shift or failure. The SMDJ15CAH's DO-214AB package relies on this thermal path for steady-state power dissipation (6.5 W) and transient recovery.
How does the SMDJ15CAH compare to unidirectional SMDJ15AH in terms of application flexibility?
The SMDJ15CAH provides bidirectional protection with identical VWM, VBR, and VC specifications as the unidirectional SMDJ15AH, but without polarity marking or cathode band. This makes the SMDJ15CAH ideal for AC signal lines, differential buses, or any design where transient polarity is unpredictable. In contrast, the SMDJ15AH requires correct orientation and is limited to DC rails with known polarity. Both share the same DO-214AB package, thermal specs, and AEC-Q101 qualification-so the SMDJ15CAH is a drop-in replacement where bidirectional capability is needed.
SMDJ15CAH 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 15V
- Voltage - Breakdown (Min):
- 16.7V
- Voltage - Clamping (Max) @ Ipp:
- 24.4V
- Current - Peak Pulse (10/1000µs):
- 123A
- 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)
SMDJ15CAH FAQ
1.How can I place an order for SMDJ15CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ15CAH 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 SMDJ15CAH reliable?
The price and inventory of SMDJ15CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ15CAH is usually 5 days.
3.What payment methods are accepted for SMDJ15CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ15CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ15CAH?
SMDJ15CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ15CAH 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 SMDJ15CAH?
For technical support, including SMDJ15CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ15CAH requirements.
6.How does Aetrix verify that SMDJ15CAH is sourced from the original manufacturer or authorized distributors?
All SMDJ15CAH 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 SMDJ15CAH meets industry standards.
7.What is the process for return or replacement of SMDJ15CAH?
All SMDJ15CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ15CAH, 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 SMDJ15CAH part is unused and in its original packaging.
Return procedure for SMDJ15CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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