My Inquiry
My Account
Taiwan Semiconductor Corporation SMDJ51CA
- Part No.:
- SMDJ51CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMDJ51CA.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,368
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMDJ51CA from Taiwan Semiconductor is a bidirectional 3000W transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, with 51V working stand-off voltage (VWM), 56.7–62.7V breakdown voltage (VBR), and 82.4V maximum clamping voltage (VC) at 36.4A peak pulse current. It protects telecom and industrial power rails against ESD, lightning surges, and load-switch transients.
For engineers reviewing the SMDJ51CA datasheet, SMDJ51CA pinout, SMDJ51CA application, or SMDJ51CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1ps response time, 175°C junction rating, and DO-214AB mechanical compatibility for high-energy surge suppression in DC power interfaces.
Technical Context
The SMDJ51CA employs a glass-passivated silicon junction optimized for fast transient response (<1.0 ps) and stable bidirectional clamping across both polarities. Its thermal design supports 175°C max junction temperature and achieves 15°C/W junction-to-lead resistance, enabling reliable operation under repetitive surge stress.
Rated for 3000W peak pulse power (10/1000μs waveform), it delivers 82.4V clamping at 36.4A IPPM while maintaining ≤1μA reverse leakage at 51V VWM - critical for low-power standby circuits requiring minimal quiescent loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 56.7 V / 62.7 V - Breakdown occurs within this range at 1 mA test current, defining turn-on threshold tolerance |
| VC @ IPPM | 82.4 V - Clamped voltage at 36.4 A peak pulse current, determining protected circuit overvoltage margin |
| PPK | 3000 W - Peak pulse power handling per 10/1000μs waveform, defining surge energy capacity |
| TJ max | 175 °C - Maximum junction temperature, supporting operation in high-ambient industrial environments |
| Package | DO-214AB (SMC) - Surface-mount outline with 7.11 × 6.22 mm footprint and matte tin-plated leads |
| Polarity | Bidirectional - Symmetric clamping in both directions; no cathode marking required |
Pinout & Package
DO-214AB (SMC) package: molded plastic case meeting UL 94V-0, polarity-indifferent for bidirectional operation, with two terminals solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals function identically; clamps voltage above |VWM| in either direction |
| Case | Thermal and mechanical interface | Non-electrical; provides mechanical mounting and contributes to RθJL = 15°C/W thermal path |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for automotive load-dump and switching transient immunity (Pulse 1/2a/2b/3a/3b) |
| Glass passivated junction | Ensures stable VBR over lifetime and improved humidity resistance vs. epoxy-passivated alternatives |
| Sub-1 ps response time | Clamps ESD events before sensitive ICs experience overstress, critical for USB/RS-485 interface protection |
| Moisture sensitivity level 1 | Zero bake requirement before reflow; compatible with standard SMT assembly without dry-pack handling |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS directives for environmentally compliant industrial manufacturing |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 48V DC bus inputs against inductive kickback from relay coils and solenoid drivers. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across input terminals to limit transient excursions to ≤82.4V. Use Value: Prevents MOSFET gate oxide failure and microcontroller brownout during 3000W surge events without adding series impedance. | Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins from battery line transients during jump-start or alternator load dump. IC Role / Device Role / Timing Role: Standoff-rated (51V) bidirectional suppressor absorbing ISO 7637-2 Pulse 2b and 5a energy. Use Value: Maintains signal integrity below 82.4V clamping threshold while surviving >100,000 surge cycles per vehicle lifetime. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: Input-stage surge protection on PoE-powered remote radios and base station backhaul equipment. IC Role / Device Role / Timing Role: Primary clamping device on 48–57V DC feed lines, coordinated with upstream fuses and downstream LC filters. Use Value: Limits voltage overshoot to safe levels for DC-DC controllers and Ethernet PHYs during lightning-induced surges. | Use Scenario: DC-link protection in solar string inverters exposed to grid-side switching transients and nearby lightning strikes. IC Role / Device Role / Timing Role: Parallel-connected TVS across 600V+ DC bus capacitors to absorb localized high-dI/dt events. Use Value: Provides fail-safe clamping margin beyond MOV-based primary protection, reducing risk of capacitor overvoltage rupture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC51CA | Same VWM (51V) and VC (82.4V), but lower PPK (1500W); smaller DO-214AA (SMB) package | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 5a or 3000W lightning tests | Select only when board space is constrained and surge energy is ≤1500W |
| SMCJ51CA | Identical electrical specs and DO-214AB package; manufactured by Vishay, same pinout and thermal performance | Drop-in replacement with identical layout, qualification, and automotive-grade reliability documentation | Preferred for dual-sourcing where Vishay's AEC-Q200 qualification is required |
Compared with SAC51CA and SMCJ51CA, the SMDJ51CA offers full 3000W surge rating in the industry-standard DO-214AB footprint, making it optimal for high-reliability industrial and automotive applications where energy handling and thermal robustness are prioritized over size reduction.
Availability
SMDJ51CA is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power feeds, and renewable energy inverters requiring stable component supply and long-term production continuity.
Supply support for SMDJ51CA 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 industrial and automotive markets since 1979.
The SMDJ series was designed specifically for high-energy transient suppression in harsh-environment DC power systems, emphasizing robustness, repeatable clamping, and compliance with international surge immunity standards.
FAQ
What is the maximum clamping voltage of the SMDJ51CA under specified test conditions?
The SMDJ51CA has a maximum clamping voltage (VC) of 82.4 V at 36.4 A peak pulse current (IPPM), measured using the 10/1000 μs standard waveform. This value defines the upper voltage limit imposed on protected circuitry during a 3000W transient event and is confirmed in the Electrical Specifications table of the Taiwan Semiconductor datasheet revision I2104.
Is the SMDJ51CA unidirectional or bidirectional, and how is polarity identified?
The SMDJ51CA is a bidirectional TVS diode, meaning it clamps symmetrically for both positive and negative transients. Unlike unidirectional variants (e.g., SMDJ51A), it carries the "CA" suffix and has no cathode band marking - both terminals are functionally identical, eliminating orientation concerns during automated placement.
Does the SMDJ51CA meet automotive surge immunity standards?
Yes, the SMDJ51CA meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b, making it suitable for protecting electronic control units in automotive applications. Its 3000W peak power rating and 82.4V clamping voltage ensure compliance with load-dump and inductive-switching transient profiles defined in that standard.
What is the thermal resistance from junction to lead (RθJL) for the SMDJ51CA?
The SMDJ51CA has a typical junction-to-lead thermal resistance (RθJL) of 15°C/W, as specified in the Thermal Performance section of the datasheet. This low value supports efficient heat transfer to the PCB copper pour or heatsink pad, enabling sustained operation at elevated ambient temperatures up to 125°C with appropriate layout.
Can the SMDJ51CA be used in place of the SMDJ51A in an existing design?
No - the SMDJ51CA is bidirectional while the SMDJ51A is unidirectional. Substituting SMDJ51CA for SMDJ51A may cause unintended forward conduction in DC-biased circuits. The SMDJ51CA should only replace SMDJ51A if the application requires symmetrical clamping and the circuit topology supports bidirectional operation without forward-bias conflicts.
SMDJ51CA 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):
- 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)
SMDJ51CA FAQ
1.How can I place an order for SMDJ51CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMDJ51CA 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 SMDJ51CA reliable?
The price and inventory of SMDJ51CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMDJ51CA is usually 5 days.
3.What payment methods are accepted for SMDJ51CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMDJ51CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMDJ51CA?
SMDJ51CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMDJ51CA 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 SMDJ51CA?
For technical support, including SMDJ51CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMDJ51CA requirements.
6.How does Aetrix verify that SMDJ51CA is sourced from the original manufacturer or authorized distributors?
All SMDJ51CA 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 SMDJ51CA meets industry standards.
7.What is the process for return or replacement of SMDJ51CA?
All SMDJ51CA units undergo pre-shipment inspection (PSI). If there is an issue with SMDJ51CA, 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 SMDJ51CA part is unused and in its original packaging.
Return procedure for SMDJ51CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMDJ51CA Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
