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Taiwan Semiconductor Corporation SMAJ58C
- Part No.:
- SMAJ58C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ58C.pdf
- Description:
- 400W, 71.6V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:6,568
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Product details
Overview
SMAJ58C from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 58V working stand-off voltage (VWM), 64.4–78.7V breakdown voltage (VBR), and 103V maximum clamping voltage (VC) at 3.9A peak impulse current. It delivers fast response (<1.0ps), low leakage (<1μA @ VWM), and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics protection.
For engineers reviewing the SMAJ58C datasheet, SMAJ58C pinout, SMAJ58C application, or SMAJ58C equivalent, key selection criteria include clamping performance under 10/1000μs surge, unidirectional polarity marking, DO-214AC thermal and mechanical compatibility, and compliance with automotive transients and RoHS/halogen-free requirements.
Technical Context
The SMAJ58C operates as a unidirectional avalanche diode, designed to clamp transient overvoltages above its VBR while maintaining low leakage below VWM. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
It is rated for 400W peak pulse power (10/1000μs waveform), derated linearly above 25°C ambient, with maximum junction temperature of 150°C and storage range from –55°C to +150°C. Polarity is indicated by cathode band per DO-214AC mechanical standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 58 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 64.4 V / 78.7 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold tolerance |
| VC @ IPPM | 103 V - Clamped voltage at 3.9 A peak impulse current; determines protected circuit's max overvoltage exposure |
| PPPM | 400 W - Peak pulse power handling capability with 10/1000μs waveform; critical for automotive load dump immunity |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off voltage; ensures minimal standby power loss and signal integrity |
| Package | DO-214AC (SMA) - Surface-mount package with 0.060 g mass, UL 94V-0 molding, and J-STD-002 solderability |
| TJ max | 150 °C - Maximum junction temperature; sets thermal design margin for PCB layout and power derating |
Pinout & Package
DO-214AC (SMA) surface-mount package with axial lead configuration: Cathode marked by band on body; anode and cathode terminals are non-polarized in layout but functionally asymmetric due to unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage rail; forms current path during reverse-biased clamping |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 12V rail); carries surge current into ground via anode during overvoltage event |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR over time and temperature, reducing parameter drift in harsh environments |
| Fast response time <1.0 ps | Clamps ESD and fast transients before sensitive downstream ICs experience overstress |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive power line immunity including load dump, jump start, and inductive switching |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking; supports high-yield automated assembly |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental regulations and enables use in green electronics manufacturing |
Applications
| Automotive Power Line Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 12V/24V vehicle battery-fed circuits against load dump (ISO 7637-2 Pulse 5a) and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to shunt surge energy away from MCU, CAN transceivers, and sensors. Use Value: Limits clamped voltage to 103 V during 3.9 A surge, preventing damage to 36 V-rated components downstream. | Use Scenario: Safeguarding isolated DC/DC converter primary-side inputs in factory automation controllers exposed to relay coil flyback and motor drive noise. IC Role / Device Role / Timing Role: Standoff protector on 48 V input rail, absorbing repetitive 10/1000 μs surges up to 400 W without degradation. Use Value: Maintains <1 μA leakage at 58 V, avoiding unnecessary quiescent current draw in always-on systems. |
| LED Driver Power Stage | Telecom Power Adapter Output |
Use Scenario: Shielding constant-current LED driver ICs from inductive kickback when driving high-power arrays in street lighting. IC Role / Device Role / Timing Role: Fast-clamping TVS across MOSFET drain-source or input capacitor to suppress voltage spikes during PWM switching transitions. Use Value: Responds in <1.0 ps to limit overshoot to ≤103 V, preserving gate oxide integrity and output regulation stability. | Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters powering PoE-powered devices or base station radios. IC Role / Device Role / Timing Role: Unidirectional clamp on regulated 58 V output rail to absorb coupling transients from mains or Ethernet cabling. Use Value: Delivers 400 W pulse rating with DO-214AC thermal mass, enabling robust surge handling without heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ58A | Narrower VBR range (64.4–71.2 V vs. 64.4–78.7 V); lower VC = 93.6 V at 4.3 A | Better clamping ratio for precision rails; slightly reduced surge current capacity | Select SMAJ58A when tighter VBR tolerance and lower VC are prioritized over maximum IPPM |
| SMBJ58C | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; 600 W PPPM rating | Higher power handling and thermal mass; requires larger PCB footprint | Choose SMBJ58C for designs needing >400 W surge margin or extended thermal endurance |
Compared with SMAJ58A and SMBJ58C, the SMAJ58C offers balanced clamping performance and compact DO-214AC footprint-ideal for space-constrained automotive and industrial modules where 400 W peak pulse capability suffices.
Availability
SMAJ58C is available at Aetrix Electronics and suitable for automotive power line protection, industrial DC/DC converter input stages, and LED driver power stage applications requiring stable component supply, consistent parametric performance, and full traceability.
Supply support for SMAJ58C 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, specializing in power management, protection, and signal conditioning devices.
The SMAJ series is part of TSC's transient voltage suppressor product line, engineered specifically for robust, standards-compliant overvoltage protection in automotive, industrial, and telecom power systems.
FAQ
What is the polarity configuration of the SMAJ58C?
The SMAJ58C is a unidirectional TVS diode, with cathode identified by a band on the DO-214AC package body. It conducts only during reverse-biased overvoltage events-forward conduction is not intended for protection. This polarity must be observed during PCB layout to ensure correct clamping behavior on the protected line.
Does the SMAJ58C meet automotive transient immunity standards?
Yes, the SMAJ58C meets ISO 7637-2 requirements for Pulse 1, 2a, 2b, 3a, and 3b, making it suitable for 12 V and 24 V automotive power networks. Its 400 W peak pulse rating and 103 V clamping voltage at 3.9 A enable reliable suppression of load dump, jump start, and inductive switching transients in ECUs and body control modules.
What is the maximum junction temperature rating for the SMAJ58C?
The SMAJ58C has a maximum junction temperature (TJ max) of 150°C, as specified in its absolute maximum ratings. This allows operation in under-hood automotive environments and industrial enclosures with elevated ambient temperatures, provided PCB copper area and airflow provide adequate thermal dissipation per the derating curve in Figure 2.
How does the SMAJ58C differ from the SMAJ58A variant?
The SMAJ58C has a wider VBR range (64.4–78.7 V) and higher clamping voltage (103 V at 3.9 A), while the SMAJ58A offers tighter VBR (64.4–71.2 V) and lower VC (93.6 V at 4.3 A). Both share the same VWM (58 V) and package, but SMAJ58A provides improved clamping ratio at the expense of reduced peak surge current handling.
Is the SMAJ58C RoHS and halogen-free compliant?
Yes, the SMAJ58C is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound is UL 94V-0 rated, and matte tin-plated leads meet J-STD-002 solderability requirements-ensuring compatibility with lead-free reflow processes and environmentally regulated end markets.
SMAJ58C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 58V
- Voltage - Breakdown (Min):
- 64.4V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 3.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ58C FAQ
1.How can I place an order for SMAJ58C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ58C 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 SMAJ58C reliable?
The price and inventory of SMAJ58C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ58C is usually 5 days.
3.What payment methods are accepted for SMAJ58C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ58C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ58C?
SMAJ58C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ58C 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 SMAJ58C?
For technical support, including SMAJ58C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ58C requirements.
6.How does Aetrix verify that SMAJ58C is sourced from the original manufacturer or authorized distributors?
All SMAJ58C 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 SMAJ58C meets industry standards.
7.What is the process for return or replacement of SMAJ58C?
All SMAJ58C units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ58C, 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 SMAJ58C part is unused and in its original packaging.
Return procedure for SMAJ58C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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