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Taiwan Semiconductor Corporation SMAJ58
- Part No.:
- SMAJ58
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ58.pdf
- Description:
- 400W, 71.6V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:2,800
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Product details
Overview
SMAJ58 from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for primary overvoltage protection in DC power rails. It features a 58 V working stand-off voltage (VWM), 64.4–78.7 V breakdown voltage (VBR) at 1 mA test current, 103 V maximum clamping voltage (VC) at 3.9 A peak impulse current, and 400 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMAJ58 datasheet, SMAJ58 pinout, SMAJ58 application, or SMAJ58 equivalent, key selection considerations include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b transients, junction temperature limits up to +150 °C, and compatibility with automated SMT placement due to glass-passivated junction and matte tin-plated leads.
Technical Context
The SMAJ58 operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR range (64.4–78.7 V) and clamping transient energy within 1.0 ps response time. Its single-die DO-214AC construction supports bidirectional variants only with "CA" suffix - SMAJ58 itself is unidirectional, marked with cathode band.
It delivers 400 W peak pulse power (10/1000 µs) at 25 °C, derating linearly above that ambient per Fig.2; steady-state power dissipation is 1 W, and maximum junction temperature is rated at +150 °C. Reverse leakage remains ≤1 µA at VWM = 58 V, ensuring low standby power loss in protected circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 58 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin. |
| VBR min/max | 64.4 V / 78.7 V at IT = 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across production lot. |
| VC @ IPPM | 103 V at IPPM = 3.9 A (10/1000 µs) - Clamped voltage seen by downstream circuit during worst-case surge. |
| PPPM | 400 W - Peak transient energy absorption capability; sufficient for automotive load dump and ISO 7637-2 compliance. |
| IR @ VWM | ≤1 µA - Negligible leakage at rated stand-off voltage; avoids unnecessary power drain or false triggering. |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline; compatible with JEDEC MS-013, 7,500 pcs/reel tape-and-reel. |
| TJ max | +150 °C - Enables operation in high-temperature environments such as under-hood automotive or industrial power supplies. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band on one end. Leads meet J-STD-002 solderability and JESD 201 Class 2 whisker resistance requirements. Weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current path / Cathode reference | Connected to system ground or lower-potential node; reverse-biased during normal operation. |
| Cathode (marked) | Transient conduction terminal | Connected to protected line (e.g., +58 V rail); conducts avalanche current to ground during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity exposure. |
| Sub-1 ps response time | Clamps transients before sensitive ICs experience overstress - critical for protecting CAN, LIN, or MCU I/O pins. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (capacitive coupling) waveforms. |
| Moisture sensitivity level 1 | No floor life limitation or bake requirement before reflow - simplifies SMT manufacturing and inventory handling. |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive - suitable for consumer, industrial, and automotive applications with strict material compliance. |
Applications
| Automotive Power Distribution | Industrial DC/DC Converters |
|---|---|
Use Scenario: Protecting 48 V battery-fed control modules against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp surges exceeding 58 V. Use Value: Limits peak voltage to 103 V during 400 W transients, preventing damage to upstream PMICs and microcontrollers. |
Use Scenario: Safeguarding isolated 24 V output of industrial DC/DC converters from ESD and switching noise. IC Role / Device Role / Timing Role: Standoff protector on secondary-side output, absorbing coupled transients from primary-side MOSFET switching. Use Value: Maintains <1 µA leakage at 58 V nominal, avoiding regulation drift while delivering sub-100 ns clamping response. |
| LED Driver Input Stage | Telecom Power Interface |
Use Scenario: Input protection for constant-current LED drivers powered from 48 V telecom or streetlight supplies. IC Role / Device Role / Timing Role: First-line defense against lightning-induced surges and hot-swap transients on input bus. Use Value: Withstands 3.9 A peak impulse without degradation, preserving driver IC lifetime under repeated surge stress. |
Use Scenario: Overvoltage guard on -48 V DC feeding line cards in central office equipment. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to system ground, suppressing positive-going spikes on negative rails. Use Value: 103 V clamping voltage ensures protected ASICs remain below absolute maximum ratings during 10/1000 µs surges. |
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); tighter 5% tolerance; same VC = 93.6 V at 4.3 A. | Better suited for precision-clamp designs where consistent turn-on voltage is prioritized over margin. | Select SMAJ58A when VBR consistency matters more than peak current capacity. |
| SMBJ58 | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; 600 W PPPM rating (vs. 400 W). | Higher power handling enables longer surge duration support; requires larger PCB footprint. | Choose SMBJ58 if system-level testing reveals 400 W insufficient for worst-case ISO 7637-2 Pulse 1 events. |
Compared with SMAJ58A and SMBJ58, the SMAJ58 offers balanced clamping performance and compact DO-214AC packaging - ideal for space-constrained 48 V systems requiring certified ISO 7637-2 immunity without over-engineering.
Availability
SMAJ58 is available at Aetrix Electronics and suitable for automotive power distribution, industrial DC/DC converters, LED driver input stages, and telecom power interface applications requiring stable component supply and full traceability.
Supply support for SMAJ58 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 SMAJ series is part of TSC's transient voltage suppressor portfolio, engineered specifically for robust, standards-compliant overvoltage protection in harsh electromagnetic environments.
FAQ
What is the maximum clamping voltage of the SMAJ58 under standard test conditions?
The SMAJ58 has a maximum clamping voltage (VC) of 103 V when subjected to a 10/1000 µs peak impulse current of 3.9 A. This value is measured per industry-standard surge waveform and represents the highest voltage the protected circuit will experience during a defined transient event. The SMAJ58 maintains this clamping performance across its qualified operating temperature range.
Is the SMAJ58 suitable for bidirectional transient protection?
No - the SMAJ58 is a unidirectional TVS diode, intended for protection against positive-going transients on grounded systems. For bidirectional applications, Taiwan Semiconductor specifies the SMAJ58CA variant. The SMAJ58 uses a cathode band marking and must be oriented with cathode toward the protected line to function correctly.
Does the SMAJ58 meet automotive EMC standards?
Yes - the SMAJ58 meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnection), and Pulse 3a/3b (capacitive coupling). Its 400 W peak pulse power rating and fast <1.0 ps response time enable reliable compliance in 12 V and 48 V vehicle networks when properly implemented in layout.
What is the leakage current specification for the SMAJ58 at its working voltage?
The SMAJ58 exhibits a maximum reverse leakage current (IR) of 1 µA when biased at its working stand-off voltage (VWM) of 58 V. This low leakage ensures minimal power loss in standby mode and avoids interference with high-impedance sensing circuits or voltage monitoring functions downstream of the SMAJ58.
Can the SMAJ58 be used in lead-free reflow processes?
Yes - the SMAJ58 is qualified for lead-free reflow soldering per J-STD-020 moisture sensitivity level 1, meaning it has unlimited floor life and does not require baking prior to assembly. Its matte tin-plated leads comply with J-STD-002 for solderability, supporting standard Pb-free reflow profiles up to 260 °C peak temperature.
SMAJ58 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ58 FAQ
1.How can I place an order for SMAJ58 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ58 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 SMAJ58 reliable?
The price and inventory of SMAJ58 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ58 is usually 5 days.
3.What payment methods are accepted for SMAJ58?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ58 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ58?
SMAJ58 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ58 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 SMAJ58?
For technical support, including SMAJ58 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ58 requirements.
6.How does Aetrix verify that SMAJ58 is sourced from the original manufacturer or authorized distributors?
All SMAJ58 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 SMAJ58 meets industry standards.
7.What is the process for return or replacement of SMAJ58?
All SMAJ58 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ58, 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 SMAJ58 part is unused and in its original packaging.
Return procedure for SMAJ58:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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