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Taiwan Semiconductor Corporation SMDJ51A
- Part No.:
- SMDJ51A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ51A.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,243
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Product details
Overview
SMDJ51A from Taiwan Semiconductor is a unidirectional 3000W surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with a working stand-off voltage of 51 V, breakdown voltage range 56.7–62.7 V at 1 mA, clamping voltage of 82.4 V at 36.4 A peak pulse current, and maximum junction temperature of 175 °C. It protects telecom and industrial power rails against ESD, lightning-induced surges, and load-switch transients.
For engineers reviewing the SMDJ51A datasheet, SMDJ51A pinout, SMDJ51A application, or SMDJ51A equivalent, key selection criteria include its 51 V stand-off rating, 82.4 V clamping performance at 36.4 A, DO-214AB mechanical compatibility, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and unidirectional polarity marking for DC-biased protection circuits.
Technical Context
The SMDJ51A operates as a silicon avalanche diode optimized for high-energy transient suppression in DC power lines. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1 µA at 51 V), while its thermal resistance (RθJA = 75 °C/W, RθJL = 15 °C/W) supports sustained surge handling in compact PCB layouts.
Designed for single-pulse, non-repetitive events per IEC 61000-4-5 and ISO 7637-2, it delivers sub-1 ps response time and meets JESD201 Class 2 whisker resistance, J-STD-020 Level 1 moisture sensitivity, and UL 94V-0 flammability requirements - all verified under TA = 25 °C conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin. |
| VBR @ IT = 1 mA | 56.7–62.7 V - Measured breakdown threshold; ensures reliable turn-on above normal operating voltage. |
| VC @ IPPM = 36.4 A | 82.4 V - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress level. |
| PPK | 3000 W - Peak pulse power rating; enables robust immunity to 8.3 ms half-sine or 10/1000 µs transients. |
| TJ max | 175 °C - Maximum junction temperature; allows operation in high-ambient industrial environments. |
| IR @ VWM | <1 µA - Reverse leakage at stand-off voltage; minimizes standby power loss in battery-backed systems. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Matte tin-plated leads, UL 94V-0 molding compound, 0.290 g typical weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes conduction path during transient clamp event. |
| Cathode | High-side connection point | Connected to protected line (e.g., +51 V rail); polarity mark indicates direction of conduction. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable avalanche characteristics over temperature and lifetime without degradation. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive and industrial supply-line transient immunity testing without external filtering. |
| Sub-1 ps response time | Clamps transients before sensitive downstream ICs experience overvoltage stress. |
| J-STD-020 Level 1 moisture sensitivity | Enables standard reflow assembly without pre-bake; compatible with automated SMT lines. |
Applications
| Telecom Power Input Protection | Industrial PLC I/O Module |
|---|---|
Use Scenario: Protecting 48 V DC input stage of VoIP gateways and base station power supplies from induced lightning surges and hot-swap transients. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed across input rail and chassis ground to shunt >3000 W surges within nanoseconds. Use Value: Limits clamped voltage to 82.4 V, keeping downstream DC-DC converters and PMICs within absolute maximum ratings. | Use Scenario: Safeguarding analog input channels (e.g., 0–10 V, 4–20 mA) on programmable logic controller modules exposed to field wiring transients. IC Role / Device Role / Timing Role: Standoff-clamp TVS mounted at connector entry point to absorb fast-rising ESD and inductive kickback. Use Value: Sub-1 ps response and <1 µA leakage preserve signal integrity and measurement accuracy during normal operation. |
| Automotive Body Control Module | Consumer AC-DC Adapter Output |
Use Scenario: Suppressing load-dump and jump-start transients on 12 V auxiliary power nets in BCMs per ISO 7637-2 Pulse 5a/5b. IC Role / Device Role / Timing Role: Primary rail protector upstream of LDOs and microcontrollers; coordinated with fuse and choke for staged immunity. Use Value: 3000 W rating handles 12 V system surges up to 36.4 A peak, maintaining VC ≤ 82.4 V to prevent latch-up. | Use Scenario: Secondary-side overvoltage protection on isolated 5 V/12 V outputs of wall adapters used in smart home hubs and IoT gateways. IC Role / Device Role / Timing Role: Final-stage TVS ensuring no hazardous voltage reaches USB ports or connected peripherals during fault conditions. Use Value: DO-214AB footprint allows direct integration into space-constrained adapter PCBs without redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A (Bourns) | Same 51 V VWM, but lower PPK = 600 W; DO-214AA (SMB) package, smaller footprint and thermal mass. | Not suitable for 3000 W surge events; limited to lower-energy transients like ESD or capacitive coupling. | Select only when system-level testing confirms ≤600 W threat profile and board space is constrained. |
| 1.5KE51A (ON Semiconductor) | Through-hole TO-204AA (DO-41); same VWM/VC specs but higher RθJA (~100 °C/W); leaded, not SMT-compatible. | Requires manual or wave soldering; incompatible with automated SMT lines and high-density layouts. | Choose only for legacy through-hole designs or prototyping where rework tolerance outweighs production efficiency. |
Compared with SMBJ51A and 1.5KE51A, the SMDJ51A uniquely delivers 3000 W surge capability in a surface-mount DO-214AB package, enabling automated assembly and high-power transient resilience in space-limited industrial and telecom PCBs without compromising clamping performance or thermal reliability.
Availability
SMDJ51A is available at Aetrix Electronics and suitable for telecom power input protection, industrial PLC I/O modules, automotive body control units, and consumer AC-DC adapter output stages requiring stable component supply and consistent surge immunity performance.
Supply support for SMDJ51A 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, rectifiers, and MOSFETs for industrial, automotive, and computing markets.
The SMDJ series is engineered specifically for high-energy transient suppression in surface-mount power systems, balancing clamping precision, surge capacity, and manufacturability for mission-critical DC rail protection.
FAQ
What is the maximum clamping voltage of the SMDJ51A under rated surge conditions?
The SMDJ51A has a maximum clamping voltage (VC) of 82.4 V when subjected to its rated peak pulse current of 36.4 A (10/1000 µs waveform). This value is measured per JEDEC standards and guarantees that downstream components see no more than 82.4 V during a full 3000 W transient event. The SMDJ51A maintains this clamping performance consistently across its specified junction temperature range of –55 °C to +175 °C.
Is the SMDJ51A suitable for bidirectional transient protection?
No, the SMDJ51A is unidirectional and intended only for DC circuits with defined polarity. For bidirectional protection, the SMDJ51CA variant must be used - it features symmetrical breakdown in both directions and identical clamping performance. The SMDJ51A's cathode band marking and forward voltage specification (3.5 V @ 100 A) confirm its unidirectional design; using it in AC or floating applications risks failure during reverse conduction.
What is the thermal resistance from junction to ambient for the SMDJ51A?
The SMDJ51A has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on a standard FR-4 PCB with minimum recommended copper pad area per the DO-214AB footprint. This value assumes natural convection cooling and is critical for estimating steady-state temperature rise under continuous power dissipation (PD = 6.5 W). Derating curves in the official Taiwan Semiconductor datasheet (Version I2104) must be applied for operation above 25 °C ambient.
Does the SMDJ51A meet automotive transient immunity standards?
Yes, the SMDJ51A meets ISO 7637-2 test pulses 1, 2a, 2b, 3a, and 3b - all required for automotive electronic module qualification. While not rated for Pulse 5 (load dump), its 3000 W peak power rating and 82.4 V clamping make it suitable for protecting auxiliary 12 V/24 V subsystems such as lighting controllers and sensor interfaces. Full automotive qualification requires system-level validation per ISO 16750-2, but the SMDJ51A provides the foundational component-level immunity.
What is the moisture sensitivity level (MSL) rating for the SMDJ51A?
The SMDJ51A is rated MSL Level 1 per J-STD-020, meaning it may be stored indefinitely at ≤30 °C/60 % RH and is fully compatible with standard Pb-free reflow profiles without preconditioning or baking. This eliminates handling constraints in high-volume SMT manufacturing and ensures long-term shelf life without desiccant packaging or dry-box storage - a key advantage over higher-MSL TVS devices requiring strict floor-life controls.
SMDJ51A 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):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 36.4A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMDJ51A FAQ
1.How can I place an order for SMDJ51A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ51A 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 SMDJ51A reliable?
The price and inventory of SMDJ51A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ51A is usually 5 days.
3.What payment methods are accepted for SMDJ51A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ51A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ51A?
SMDJ51A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ51A 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 SMDJ51A?
For technical support, including SMDJ51A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ51A requirements.
6.How does Aetrix verify that SMDJ51A is sourced from the original manufacturer or authorized distributors?
All SMDJ51A 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 SMDJ51A meets industry standards.
7.What is the process for return or replacement of SMDJ51A?
All SMDJ51A units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ51A, 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 SMDJ51A part is unused and in its original packaging.
Return procedure for SMDJ51A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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