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Taiwan Semiconductor Corporation SMAJ58A
- Part No.:
- SMAJ58A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ58A.pdf
- Description:
- TVS DIODE 58VWM 93.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,758
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Product details
Overview
SMAJ58A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for robust overvoltage protection in DC power rails. It features a 58 V working stand-off voltage (VWM), 64.4–71.2 V breakdown voltage (VBR), 93.6 V maximum clamping voltage (VC) at 3.9 A peak impulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - ideal for protecting SMPS outputs and automotive DC/DC converters.
For engineers reviewing the SMAJ58A datasheet, SMAJ58A pinout, SMAJ58A application, or SMAJ58A equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b stress, unidirectional polarity marking, moisture sensitivity level 1 compliance, and compatibility with automated SMT placement on high-reliability industrial and automotive PCBs.
Technical Context
The SMAJ58A operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology for stable breakdown behavior and sub-1 ps response time from 0 V to VBR(min). Its clamping action begins at ≥64.4 V and limits transient energy to ≤93.6 V at 3.9 A (10/1000 µs), enabling reliable protection of downstream MOSFETs, controllers, and sensing circuitry.
Rated for -55 °C to +150 °C junction temperature, it supports high-temperature environments such as under-hood automotive modules and industrial power supplies. With <1 µA reverse leakage at 58 V and 25 °C, it minimizes standby power loss while maintaining low-capacitance operation suitable for fast-switching DC/DC topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 58 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR @ IT=1 mA | 64.4–71.2 V - Confirmed avalanche onset range ensuring predictable turn-on during transients |
| VC @ IPPM=3.9 A | 93.6 V - Clamped voltage seen by protected circuit during 10/1000 µs surge, limiting stress on downstream ICs |
| PPPM | 400 W - Peak transient power absorption capability per standard 10/1000 µs waveform |
| IR @ VWM | <1 µA - Negligible leakage current at operating voltage, preserving efficiency in low-power systems |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with cathode band marking and J-STD-002 solderability |
| TJ max | +150 °C - Enables use in thermally demanding applications including engine control units and industrial motor drives |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; meets UL 94V-0 flammability and JESD201 Class 2 whisker resistance requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage rail; defines unidirectional conduction path from cathode to anode during clamping |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 58 V supply rail); marked by band; conducts avalanche current to anode when VAK ≥ VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable, repeatable breakdown voltage and long-term reliability under repeated surge stress |
| Sub-1 ps response time | Enables suppression of fast-rising ESD and switching-induced transients before sensitive components are damaged |
| ISO 7637-2 compliance | Validated for automotive load-dump and inductive-switching immunity (Pulse 1/2a/2b/3a/3b) |
| Moisture sensitivity level 1 | Allows unlimited floor life and reflow without baking, simplifying SMT manufacturing flow |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS directives for environmentally constrained applications |
Applications
| Automotive Power Rail Protection | Industrial SMPS Output Clamping |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and system input filter to clamp surges up to 100 V. Use Value: Limits peak voltage to 93.6 V at 3.9 A, preventing damage to upstream DC/DC controllers and CAN transceivers. | Use Scenario: Safeguarding output stage of isolated flyback converter supplying 58 V to LED drivers or sensors. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across secondary winding to absorb reflected switching spikes and cross-regulation overshoot. Use Value: Maintains 58 V nominal operation with <1 µA leakage, while clamping 10/1000 µs surges to safe levels without affecting regulation stability. |
| On-Board DC/DC Converter Input | Lighting System Surge Suppression |
Use Scenario: Input protection for 58 V input buck converter in railway signaling equipment exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-line TVS placed before input EMI filter to divert surge energy before reaching power stage FETs. Use Value: Absorbs 400 W transient energy without degradation, supporting EN 50121-3-2 compliance for rolling stock electronics. | Use Scenario: Overvoltage protection for constant-current LED driver inputs in street lighting powered by solar-charged 48 V batteries. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at driver input to suppress inductive kickback from relay-controlled dimming circuits. Use Value: Fast 64.4–71.2 V breakdown ensures early clamping of >70 V transients, extending LED module lifetime and reducing field failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ58CA | Bidirectional variant; symmetric VBR (64.4–78.7 V) and VC (103 V); same package and power rating | Required where AC-coupled lines or bidirectional signal paths need protection (e.g., RS-485, CAN bus) | Select SMAJ58CA only if polarity-agnostic clamping is needed; SMAJ58A is optimal for DC rail protection with defined ground reference. |
| SMBJ58A | Same electrical specs but in larger DO-214AA (SMB) package; higher thermal mass; 1 W steady-state power vs. SMAJ58A's 1 W | Better suited for high-temperature ambient designs (>105 °C) or where board space allows larger footprint | Choose SMBJ58A when thermal derating margin or mechanical robustness outweighs size constraints; SMAJ58A preferred for dense SMT layouts. |
Compared with SMAJ58CA and SMBJ58A, the SMAJ58A offers optimal balance of compact DO-214AC footprint, unidirectional precision, and automotive-grade surge immunity - making it the default choice for space-constrained 58 V DC rail protection where polarity is fixed and ISO 7637-2 compliance is mandatory.
Availability
SMAJ58A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial SMPS output clamping, and on-board DC/DC converter input protection requiring stable component supply and full traceability.
Supply support for SMAJ58A 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 TVS diodes, rectifiers, MOSFETs, and power management devices.
The SMAJ series is engineered specifically for high-reliability transient suppression in automotive, industrial, and telecom power systems - emphasizing fast response, low leakage, and standardized surface-mount packaging for automated assembly.
FAQ
What is the clamping voltage of SMAJ58A under a 10/1000 µs surge?
The SMAJ58A has a maximum clamping voltage (VC) of 93.6 V when subjected to a 10/1000 µs waveform at its rated peak impulse current of 3.9 A. This value is measured per JEDEC standards and confirmed in Taiwan Semiconductor's U2102 datasheet revision. The clamping performance ensures protected circuits remain below critical voltage thresholds during transient events, directly supporting design margins for 60 V-rated components. SMAJ58A maintains this specification across its full operating temperature range (-55 °C to +150 °C).
Is SMAJ58A unidirectional or bidirectional?
SMAJ58A is a unidirectional TVS diode, with polarity clearly marked by a cathode band on the DO-214AC (SMA) package. Its electrical characteristics - including VWM = 58 V and VBR = 64.4–71.2 V - apply only in the reverse-biased direction (cathode positive relative to anode). Forward conduction follows standard silicon diode behavior (VF ≈ 3.5 V at 25 A), and it must be installed with correct orientation in DC circuits. SMAJ58A is not interchangeable with bidirectional variants like SMAJ58CA without circuit review.
Does SMAJ58A meet automotive surge immunity standards?
Yes, SMAJ58A meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupling), and Pulse 3b (ground noise), as explicitly stated in the Taiwan Semiconductor datasheet. Its 400 W peak pulse power rating, fast sub-1 ps response, and specified clamping behavior under 10/1000 µs waveforms make it suitable for front-end protection in automotive ECUs, body control modules, and infotainment power supplies. SMAJ58A is not rated for Pulse 5a (load dump) due to its 58 V VWM - that application requires higher-VWM variants such as SMAJ70A or SMAJ78A.
What is the maximum operating temperature for SMAJ58A?
The SMAJ58A has a maximum junction temperature (TJ max) of +150 °C and an operating junction temperature range of -55 °C to +150 °C, as defined in its Absolute Maximum Ratings table. This rating enables deployment in under-hood automotive environments, industrial motor drives, and outdoor lighting systems. Thermal derating applies above 25 °C ambient per Figure 2 in the datasheet, and the device's 1 W steady-state power dissipation (PD) must be respected in continuous fault conditions. The DO-214AC package's thermal resistance (RθJA) supports this rating when mounted on standard 1 oz copper PCBs with recommended pad layout.
How does SMAJ58A compare to SMAJ58 in terms of breakdown voltage?
SMAJ58A has a tighter breakdown voltage tolerance than SMAJ58: SMAJ58A specifies VBR = 64.4–71.2 V at IT = 1 mA, whereas SMAJ58 specifies VBR = 64.4–78.7 V. This narrower range improves design predictability for precise clamping thresholds and reduces binning variability in high-volume production. Both share identical VWM (58 V), VC (93.6 V vs. 103 V), and PPPM (400 W), but SMAJ58A's tighter VBR makes it preferable for applications requiring consistent turn-on behavior, such as regulated 58 V power distribution networks where over-clamping must be strictly bounded.
SMAJ58A 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:
- 93.6V
- Current - Peak Pulse (10/1000µs):
- 4.3A
- 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)
SMAJ58A FAQ
1.How can I place an order for SMAJ58A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ58A 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 SMAJ58A reliable?
The price and inventory of SMAJ58A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ58A is usually 5 days.
3.What payment methods are accepted for SMAJ58A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ58A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ58A?
SMAJ58A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ58A 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 SMAJ58A?
For technical support, including SMAJ58A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ58A requirements.
6.How does Aetrix verify that SMAJ58A is sourced from the original manufacturer or authorized distributors?
All SMAJ58A 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 SMAJ58A meets industry standards.
7.What is the process for return or replacement of SMAJ58A?
All SMAJ58A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ58A, 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 SMAJ58A part is unused and in its original packaging.
Return procedure for SMAJ58A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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