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Taiwan Semiconductor Corporation SMDJ45AH
- Part No.:
- SMDJ45AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ45AH.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,020
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Product details
Overview
SMDJ45AH from Taiwan Semiconductor is a unidirectional 45V stand-off, 50.0–55.3V breakdown, 3000W peak pulse power Transient Voltage Suppressor in DO-214AB (SMC) package, designed for automotive-grade ESD and surge protection in power supply rails and I/O lines of industrial control systems.
For engineers reviewing the SMDJ45AH datasheet, SMDJ45AH pinout, SMDJ45AH application, or SMDJ45AH equivalent, key selection criteria include clamping voltage (72.7V @ 41.3A), AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, fast sub-1ps response, and DO-214AB thermal performance (RθJA = 75°C/W).
Technical Context
The SMDJ45AH employs a glass-passivated silicon junction optimized for high-energy transient suppression with low clamping ratio (VC/VBR ≈ 1.31–1.45). Its unidirectional configuration enables polarity-sensitive placement on DC rails where reverse blocking is required.
It operates across –55°C to +175°C junction temperature range, supports 300A non-repetitive forward surge (8.3ms half-sine), and delivers stable leakage (<1µA @ 45V) under steady-state conditions-critical for low-power sensor interfaces and always-on automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before conduction begins; sets upper limit for protected circuit's normal DC rail. |
| VBR @ IT=1mA | 50.0–55.3 V - Breakdown threshold at test current; defines onset of avalanche clamping behavior. |
| VC @ IPPM=41.3A | 72.7 V - Clamped voltage during 3000W transient; determines maximum stress imposed on downstream ICs. |
| PPK | 3000 W - Peak pulse power rating per 10/1000µs waveform; validates capability against ISO 7637-2 Pulse 5a surges. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; informs heatsinking requirements in sealed enclosures or high-TA environments. |
| IR @ VWM | <1 µA - Reverse leakage at working voltage; ensures minimal standby current drain in battery-powered nodes. |
Pinout & Package
DO-214AB (SMC) surface-mount package with matte tin-plated leads, polarity indicated by cathode band. Weight: 0.290g. UL 94V-0 molding compound. JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or return path; must be low-impedance to sustain clamping action during surge. |
| Cathode | Protected line input | Connected to line being protected (e.g., 45V supply rail); cathode band marks this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including engine control units and body electronics modules. |
| Clamping ratio ≤1.45 | Ensures predictable overvoltage margin between VBR and VC, simplifying system-level surge margin analysis. |
| Response time <1 ps | Enables effective suppression of ESD events (IEC 61000-4-2) before sensitive CMOS inputs latch up. |
| ISO 7637-2 compliant | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching transients) requirements. |
| Moisture sensitivity level 1 | Eliminates need for baking prior to reflow soldering-supports standard SMT assembly without process modification. |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 48V auxiliary power rails in ADAS domain controllers from load-dump transients and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND to clamp surges above 45V while blocking reverse current. Use Value: Limits peak voltage to 72.7V during 3000W pulses, preserving integrity of 75V-rated DC-DC converters and CAN transceivers. | Use Scenario: Shielding analog input channels (0–10V, 4–20mA) in programmable logic controllers from field-wiring induced surges. IC Role / Device Role / Timing Role: Front-end transient suppressor on signal conditioning PCB, mounted adjacent to connector. Use Value: Sub-1ps response prevents latch-up in precision op-amps and ADC drivers exposed to lightning-induced coupling. |
| Telecom DC Power Interface | Renewable Energy Monitoring Node |
Use Scenario: Safeguarding -48V telecom rectifier outputs against switching noise and accidental short-circuit recovery spikes. IC Role / Device Role / Timing Role: Unidirectional TVS on negative rail, cathode tied to -48V, anode to system ground. Use Value: 72.7V clamping ensures downstream PMICs and FPGAs remain within absolute maximum ratings during 10/1000µs surges. | Use Scenario: Protecting RS-485 communication ports and voltage-sense circuits in solar inverter monitoring units deployed in outdoor cabinets. IC Role / Device Role / Timing Role: Bidirectional-capable variant not used; SMDJ45AH selected for cost-effective unidirectional DC bus protection. Use Value: AEC-Q101 qualification provides extended reliability confidence in high-temperature, high-humidity environments typical of rooftop installations. |
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 SMAJ45A | Same DO-214AC (SMA) package; lower PPK = 400W; VC = 72.7V @ 5.5A; RθJA = 100°C/W | Not suitable for ISO 7637-2 Pulse 5a; limited to lower-energy transients (e.g., IEC 61000-4-5 Level 3) | Select only when surge energy is ≤400W and thermal budget allows higher RθJA. |
| ON Semiconductor SMCJ45A | DO-214AB (SMC) package; identical PPK = 3000W; VC = 72.7V @ 41.3A; AEC-Q101 qualified; same VWM/VBR range | Drop-in replacement with identical footprint, ratings, and automotive qualification | Valid alternative when dual-sourcing is required; no layout or firmware changes needed. |
Compared with SMAJ45A, SMDJ45AH offers 7.5× higher surge energy handling and better thermal dissipation; versus SMCJ45A, it provides functionally identical protection with equivalent mechanical and electrical compatibility-making SMCJ45A the preferred second-source option.
Availability
SMDJ45AH is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC I/O protection, and telecom DC power interface applications requiring stable component supply, long-term lifecycle support, and AEC-Q101-compliant surge immunity.
Supply support for SMDJ45AH 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 distribution and AEC-Q101 validation capabilities.
The SMDJ series was developed specifically for high-reliability automotive and industrial transient suppression, emphasizing robust clamping performance, low leakage, and full ISO 7637-2 compliance in surface-mount form factor.
FAQ
What is the maximum clamping voltage of the SMDJ45AH under rated surge conditions?
The SMDJ45AH clamps to a maximum of 72.7 V when subjected to its rated peak pulse current of 41.3 A (10/1000 µs waveform). This value is measured at the device terminals under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during a 3000W transient event. The SMDJ45AH maintains this clamping performance across its specified operating temperature range.
Is the SMDJ45AH suitable for bidirectional transient suppression?
No, the SMDJ45AH is a unidirectional TVS diode intended for DC rail protection where polarity is fixed. For bidirectional applications, the SMDJ45CAH variant must be used-it features symmetrical breakdown in both directions and identical clamping characteristics. Using SMDJ45AH in AC or floating-bus configurations risks failure due to reverse conduction beyond its rated parameters.
Does the SMDJ45AH meet automotive qualification standards?
Yes, the SMDJ45AH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements-making it suitable for use in automotive electronic control units, body electronics, and infotainment systems. Its construction includes glass-passivated junctions and moisture sensitivity level 1, supporting standard reflow processes without preconditioning.
What is the thermal resistance from junction to ambient for the SMDJ45AH?
The SMDJ45AH has a typical junction-to-ambient thermal resistance (RθJA) of 75°C/W when mounted on a standard JEDEC 2-layer board with 1 in² copper pad. This value assumes no additional heatsinking and is critical for estimating maximum power dissipation in enclosed or high-temperature environments. Derating curves in the datasheet show allowable PPK reduction above 25°C ambient.
How does the SMDJ45AH compare to the SMAJ45A in terms of surge handling capability?
The SMDJ45AH delivers 3000W peak pulse power, whereas the SMAJ45A is rated for only 400W-making the SMDJ45AH 7.5× more capable for high-energy transients like ISO 7637-2 Pulse 5a. Additionally, SMDJ45AH's DO-214AB package offers lower RθJA (75°C/W vs. 100°C/W), enabling sustained operation under repeated surge stress where SMAJ45A would thermally saturate.
SMDJ45AH 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):
- 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)
SMDJ45AH FAQ
1.How can I place an order for SMDJ45AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ45AH 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 SMDJ45AH reliable?
The price and inventory of SMDJ45AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ45AH is usually 5 days.
3.What payment methods are accepted for SMDJ45AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ45AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ45AH?
SMDJ45AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ45AH 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 SMDJ45AH?
For technical support, including SMDJ45AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ45AH requirements.
6.How does Aetrix verify that SMDJ45AH is sourced from the original manufacturer or authorized distributors?
All SMDJ45AH 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 SMDJ45AH meets industry standards.
7.What is the process for return or replacement of SMDJ45AH?
All SMDJ45AH units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ45AH, 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 SMDJ45AH part is unused and in its original packaging.
Return procedure for SMDJ45AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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