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Taiwan Semiconductor Corporation SMAJ58AH
- Part No.:
- SMAJ58AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ58AH.pdf
- Description:
- TVS DIODE 58VWM 93.6VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,567
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Product details
Overview
SMAJ58AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power (10/1000μs), 58V working stand-off voltage (VWM), and 93.6V maximum clamping voltage (VC) at 3.9A peak impulse current. It provides AEC-Q101 qualification and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics protection.
For engineers reviewing the SMAJ58AH datasheet, SMAJ58AH pinout, SMAJ58AH application, or SMAJ58AH equivalent, key selection criteria include clamping performance under 10/1000μs transients, low leakage (<4.3μA at 58V), AEC-Q101 compliance, and DO-214AC mechanical compatibility with automated SMT assembly.
Technical Context
The SMAJ58AH operates as a unidirectional avalanche diode, activated when reverse voltage exceeds its 64.4–71.2V breakdown range (VBR @ 1mA). Its glass-passivated junction ensures stable breakdown and fast response (<1.0ps), enabling effective suppression of ESD and load-dump transients in DC power rails.
Designed for single-die configuration in DO-214AC, it delivers 400W peak pulse power up to 78V and 300W above - with thermal derating beyond 25°C ambient per Fig.2. Its 150°C max junction temperature and J-STD-020 Level 1 moisture sensitivity support reflow-compatible manufacturing.
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 / 71.2 V @ 1 mA - Confirmed avalanche onset range for reliable turn-on threshold |
| VC @ IPPM | 93.6 V @ 3.9 A - Clamped voltage during 10/1000μs transient, limiting downstream stress |
| PPPM | 400 W (10/1000μs) - Peak surge energy handling capacity for automotive load dump immunity |
| IR @ VWM | <4.3 μA - Low leakage preserves system efficiency in standby and low-power modes |
| TJ max | 150 °C - Enables operation in under-hood automotive environments and high-ambient industrial settings |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline compatible with IPC-7351B land patterns |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; weight ≈ 0.060 g; UL 94V-0 rated compound; JESD201 Class 2 whisker resistant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 58V rail); conducts during overvoltage to shunt current to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard |
| Glass passivated junction | Ensures stable VBR over lifetime and resistance to humidity-induced parameter drift |
| Fast response time <1.0 ps | Enables clamping before transient energy couples into sensitive ICs or MOSFET gates |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (line transients) |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive for environmentally constrained supply chains |
Applications
| Automotive Infotainment Power Rail | Industrial PLC Input Module |
|---|---|
Use Scenario: Protecting 58V CAN FD or Ethernet PHY power input against load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 58V supply and ground, clamping transients before they reach PMIC or interface ICs. Use Value: Limits voltage to ≤93.6V during 10/1000μs pulses, preventing latch-up or gate oxide damage in downstream 65V-rated regulators. | Use Scenario: Safeguarding analog input channel reference voltage (58V auxiliary rail) from field-wiring induced transients. IC Role / Device Role / Timing Role: Standoff protector on sensor excitation rail; absorbs coupled noise from solenoid switching or motor drives. Use Value: Maintains signal integrity by holding rail voltage within ±5% of nominal during 400W surges, avoiding ADC saturation or reference shift. |
| On-board DC/DC Converter Input | LED Driver Supply Protection |
Use Scenario: Input-side transient suppression for isolated 58V-to-12V flyback converter in vehicle lighting control units. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of primary-side controller and MOSFET gate driver. Use Value: Absorbs 1000V/10ms load dump events without degradation, preserving MOSFET VDS rating margin and enabling single-stage protection. | Use Scenario: Overvoltage guard for constant-current LED string drivers powered from 58V bus in commercial signage. IC Role / Device Role / Timing Role: Parallel-connected TVS across bulk capacitor to limit surge-induced overvoltage during hot-plug or lightning-induced coupling. Use Value: Clamps to 93.6V within <1ps, preventing premature LED string failure and maintaining luminance stability during grid disturbances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ58A | Same VWM (58V), but higher VC = 96.3V @ 3.9A; non-AEC-Q101 rated | Lacks automotive qualification; suitable only for industrial/commercial use where AEC-Q101 not mandated | Select SMAJ58A only if AEC-Q101 is unnecessary and slightly higher clamping voltage is acceptable |
| SMBJ58A | Same electrical specs but DO-214AA (SMB) package - 2.5mm wider body, different pad layout | Requires PCB redesign due to larger footprint and altered thermal mass; not drop-in | Choose SMBJ58A only when higher thermal dissipation or legacy SMB layout is required |
Compared with SMAJ58A and SMBJ58A, the SMAJ58AH offers AEC-Q101 qualification and DO-214AC packaging optimized for high-density automotive PCBs - delivering verified reliability, precise clamping (93.6V), and direct compatibility with existing SMA footprints without layout changes.
Availability
SMAJ58AH is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial programmable logic controllers, and on-board DC/DC converters requiring stable component supply with full AEC-Q101 traceability and ISO 7637-2 compliance.
Supply support for SMAJ58AH 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 automotive, industrial, and consumer markets.
The SMAJ series is designed specifically for robust transient suppression in harsh environments - emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and surface-mount scalability for automotive electronics and high-reliability industrial power systems.
FAQ
What is the clamping voltage of SMAJ58AH under a 10/1000μs transient?
The SMAJ58AH has a maximum clamping voltage (VC) of 93.6 V at 3.9 A peak impulse current under the standardized 10/1000μs waveform. This value is measured per Fig.5 in the official datasheet and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream components remain within safe operating area.
Is SMAJ58AH unidirectional or bidirectional?
SMAJ58AH is a unidirectional TVS diode, intended for DC line protection where polarity is fixed. Its cathode band marking indicates the terminal to connect toward the protected line (e.g., 58V rail), while the anode connects to ground. Bidirectional variants use CH or CAH suffixes - SMAJ58AH does not support symmetrical AC or bipolar transient suppression.
Does SMAJ58AH meet automotive qualification standards?
Yes, SMAJ58AH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. These qualifications validate its performance under automotive-specific stress conditions including load dump, battery reversal, and coupled transients - making it suitable for engine control units, body electronics, and ADAS power domains.
What is the maximum junction temperature rating for SMAJ58AH?
The SMAJ58AH has a maximum junction temperature (TJ) rating of +150°C, confirmed in the Absolute Maximum Ratings table. This allows reliable operation in under-hood automotive environments and high-ambient industrial enclosures, provided PCB thermal design maintains junction-to-ambient thermal resistance within limits defined by power dissipation and ambient conditions.
How does SMAJ58AH differ from SMAJ58H?
SMAJ58AH features tighter breakdown voltage tolerance (64.4–71.2 V vs. 64.4–78.7 V for SMAJ58H) and lower clamping voltage (93.6 V vs. 103 V), resulting in improved protection margin. Both share identical VWM (58 V), package (DO-214AC), and AEC-Q101 qualification - but SMAJ58AH delivers more consistent clamping performance for precision-sensitive applications.
SMAJ58AH 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ58AH FAQ
1.How can I place an order for SMAJ58AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ58AH 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 SMAJ58AH reliable?
The price and inventory of SMAJ58AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ58AH is usually 5 days.
3.What payment methods are accepted for SMAJ58AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ58AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ58AH?
SMAJ58AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ58AH 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 SMAJ58AH?
For technical support, including SMAJ58AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ58AH requirements.
6.How does Aetrix verify that SMAJ58AH is sourced from the original manufacturer or authorized distributors?
All SMAJ58AH 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 SMAJ58AH meets industry standards.
7.What is the process for return or replacement of SMAJ58AH?
All SMAJ58AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ58AH, 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 SMAJ58AH part is unused and in its original packaging.
Return procedure for SMAJ58AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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