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Taiwan Semiconductor Corporation SMDJ45CAH
- Part No.:
- SMDJ45CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ45CAH.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,236
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Product details
Overview
SMDJ45CAH from Taiwan Semiconductor is a bidirectional 45 V stand-off, 50.0–55.3 V breakdown, 3000 W peak pulse power Transient Voltage Suppressor in DO-214AB (SMC) package, designed for automotive-grade ESD and surge protection in power supply inputs and data line interfaces.
For engineers reviewing the SMDJ45CAH datasheet, SMDJ45CAH pinout, SMDJ45CAH application, or SMDJ45CAH equivalent, key selection criteria include clamping voltage (72.7 V @ 41.3 A), AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and unidirectional/bidirectional configuration flexibility via AH/CAH suffixing.
Technical Context
The SMDJ45CAH implements a glass-passivated silicon avalanche junction optimized for fast transient suppression with sub-1 ps response time. Its bidirectional architecture enables symmetrical clamping in both polarities without external circuitry, supporting robust protection of differential buses and AC-coupled signal paths.
Rated for 175 °C maximum junction temperature and moisture sensitivity level 1 (per J-STD-020), it sustains repetitive surge events under automotive thermal cycling conditions while maintaining stable VBR and low leakage (<1 µA @ 45 V) across its operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse working voltage before conduction begins |
| VBR @ IT=1 mA | 50.0–55.3 V - Verified avalanche breakdown threshold ensuring predictable turn-on during transients |
| VC @ IPPM=41.3 A | 72.7 V - Clamped voltage during 3000 W surge, limiting downstream stress to safe levels |
| PPK | 3000 W - Peak pulse power handling per 10/1000 µs waveform, enabling lightning-level immunity |
| IPPM | 41.3 A - Maximum non-repetitive peak current supported without degradation |
| TJ max | 175 °C - Junction temperature limit allowing operation in under-hood automotive environments |
| RθJA | 75 °C/W - Thermal resistance defining power derating above 25 °C ambient |
Pinout & Package
DO-214AB (SMC) surface-mount package with cathode band marking for polarity identification; bidirectional symmetry means no functional anode/cathode distinction in SMDJ45CAH - both terminals serve as interchangeable surge current paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional surge current path | Both terminals conduct identically during positive or negative transients - no directional bias required |
| Case | Thermal and mechanical interface | Exposed copper slug provides low-inductance path to PCB ground plane and aids heat dissipation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TC, HAST, and UHST |
| ISO 7637-2 compliant | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupled noise) |
| Glass passivated junction | Enhances long-term reliability and stability of VBR under humidity and thermal cycling |
| Fast response time | <1.0 ps typical - limits voltage overshoot before protection engages |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing |
Applications
| Automotive Power Input Protection | Industrial CAN Bus Interface |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to load dump and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional TVS clamping device placed at main power entry point. Use Value: Limits transient voltage to ≤72.7 V during 3000 W pulses, preventing damage to downstream DC-DC converters and microcontrollers. | Use Scenario: Two-wire CAN FD transceivers in factory automation nodes. IC Role / Device Role / Timing Role: Common-mode surge suppressor across CAN_H/CAN_L differential pair. Use Value: Maintains signal integrity by clamping common-mode transients without distorting differential signaling due to symmetrical bidirectional response. |
| Telecom AC-DC Adapter Input | Smart Meter RS-485 Port |
Use Scenario: Off-line AC-DC adapters subjected to lightning-induced surges on primary side. IC Role / Device Role / Timing Role: Secondary-side DC bus protector after bridge rectifier and bulk capacitor. Use Value: Absorbs 3000 W energy within 10/1000 µs, reducing need for upstream MOVs and simplifying safety certification. | Use Scenario: Utility smart meters deployed in outdoor substations with long RS-485 runs. IC Role / Device Role / Timing Role: Point-of-entry TVS on RS-485 transceiver VCC and bus lines. Use Value: Withstands repeated 41.3 A surges while maintaining <1 µA leakage at 45 V, preserving bus bias and low-power sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC45CA | Lower PPK (1500 W), higher VC (77.4 V @ 20.5 A), same DO-214AB package | Not AEC-Q101 qualified; limited to industrial/commercial grade designs | Select when cost sensitivity outweighs automotive qualification and 3000 W surge margin is not required |
| SMLJ45CA | Same VWM/VBR, lower PPK (1500 W), smaller DO-214AA (SMB) package | Reduced thermal mass limits sustained surge duty cycle; unsuitable for ISO 7637-2 Pulse 5a | Choose for space-constrained consumer electronics where 1500 W peak rating suffices |
Compared with SAC45CA and SMLJ45CA, the SMDJ45CAH delivers higher surge robustness (3000 W vs. 1500 W), automotive qualification, and lower clamping voltage - making it the preferred choice for mission-critical 12 V/24 V systems requiring full ISO 7637-2 compliance.
Availability
SMDJ45CAH is available at Aetrix Electronics and suitable for automotive control units, industrial communication gateways, telecom power supplies, and smart metering systems requiring stable component supply and long-lifecycle support.
Supply support for SMDJ45CAH 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, serving global automotive, industrial, and consumer markets since 1979.
The SMDJ series was developed specifically for high-energy transient suppression in harsh automotive and industrial environments, emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and thermally robust DO-214AB packaging.
FAQ
What does the 'CAH' suffix indicate in SMDJ45CAH?
The 'CAH' suffix denotes a bidirectional configuration - meaning the SMDJ45CAH conducts and clamps symmetrically for both positive and negative transients. Unlike unidirectional 'AH' variants, it has no cathode marking and requires no polarity-aware placement, simplifying layout for differential or AC-coupled protection circuits.
Is SMDJ45CAH suitable for ISO 7637-2 Pulse 5a (load dump) testing?
No - SMDJ45CAH is rated for ISO 7637-2 Pulses 1, 2a, 2b, 3a, and 3b only. Pulse 5a (load dump) requires higher energy handling (up to 1000 W × seconds) beyond the 3000 W / 1 ms capability of SMDJ45CAH. For load dump, consider TSC's SMAJ or P6SMB series with higher energy ratings.
What is the maximum clamping voltage of SMDJ45CAH and at what current is it specified?
The maximum clamping voltage of SMDJ45CAH is 72.7 V, measured at the peak pulse current IPPM of 41.3 A under the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and ensures downstream components see no more than 72.7 V during worst-case surge events.
Does SMDJ45CAH require derating at elevated ambient temperatures?
Yes - SMDJ45CAH must be derated above 25 °C ambient per its thermal derating curve (Fig.2). At 85 °C ambient, its peak pulse power drops to approximately 1800 W due to RθJA = 75 °C/W. Proper PCB copper area and thermal vias are essential to maintain performance in high-temperature enclosures.
Can SMDJ45CAH replace SMDJ45AH in an existing design?
Only if the circuit is inherently symmetrical and does not rely on unidirectional conduction. SMDJ45CAH is bidirectional and lacks a defined cathode, whereas SMDJ45AH is unidirectional with a marked cathode band. Swapping requires verifying that reverse-bias leakage and forward conduction behavior remain acceptable in the target application.
SMDJ45CAH 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 41.3A
- 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)
SMDJ45CAH FAQ
1.How can I place an order for SMDJ45CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ45CAH 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 SMDJ45CAH reliable?
The price and inventory of SMDJ45CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ45CAH is usually 5 days.
3.What payment methods are accepted for SMDJ45CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ45CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ45CAH?
SMDJ45CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ45CAH 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 SMDJ45CAH?
For technical support, including SMDJ45CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ45CAH requirements.
6.How does Aetrix verify that SMDJ45CAH is sourced from the original manufacturer or authorized distributors?
All SMDJ45CAH 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 SMDJ45CAH meets industry standards.
7.What is the process for return or replacement of SMDJ45CAH?
All SMDJ45CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ45CAH, 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 SMDJ45CAH part is unused and in its original packaging.
Return procedure for SMDJ45CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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