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Taiwan Semiconductor Corporation SMAJ13AH
- Part No.:
- SMAJ13AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ13AH.pdf
- Description:
- TVS DIODE 13VWM 21.5VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,126
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Product details
Overview
SMAJ13AH from Taiwan Semiconductor is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 13V working stand-off voltage (VWM), 14.4–15.9V breakdown voltage (VBR), and 21.5V clamping voltage (VC) at 18.6A peak pulse current. It delivers fast response (<1.0ps), low leakage (<1μA @ VWM), and AEC-Q101 qualification for automotive-grade surge protection in DC/DC converters and power supplies.
For engineers reviewing the SMAJ13AH datasheet, SMAJ13AH pinout, SMAJ13AH application, or SMAJ13AH equivalent, this page provides verified electrical parameters, clamping performance under 10/1000μs waveform, thermal limits (TJ = –55°C to +150°C), ISO 7637-2 compliance, and direct alternatives for circuit-level ESD/surge hardening in automotive and industrial power systems.
Technical Context
The SMAJ13AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 14.4–15.9V breakdown range at 1mA test current. Its glass-passivated junction ensures stable VBR tolerance and low IR drift across temperature.
Designed for single-pulse transient suppression per IEC 61000-4-5 and ISO 7637-2 Pulse 1/2a/2b/3a/3b, it sustains 400W peak pulse power (10/1000μs) up to 25°C, derating linearly above that ambient - delivering 21.5V clamping at 18.6A while maintaining <1μA leakage at 13V stand-off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 13 V - Maximum continuous reverse operating voltage before conduction begins; defines system bus voltage margin. |
| VBR min/max | 14.4 V / 15.9 V - Breakdown occurs within this range at 1 mA; ensures reliable turn-on without premature clamping. |
| VC @ IPPM | 21.5 V - Clamping voltage at 18.6 A peak pulse (10/1000μs); determines protected IC's maximum transient exposure. |
| PPPM | 400 W - Peak pulse power handling capability; supports robust surge immunity in automotive load-dump and inductive switching events. |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off; minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and enclosed power modules. |
| Package | DO-214AC (SMA) - Standard surface-mount outline with cathode band marking; compatible with automated pick-and-place and reflow. |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band. Weight ≈ 0.060 g. Meets UL 94V-0 flammability rating and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND) in unidirectional configuration; conducts during forward surge or ESD event. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 12V rail); avalanches into low-impedance state when transient exceeds VBR, shunting energy to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units, body electronics, and ADAS power rails. |
| Glass passivated junction | Ensures stable VBR over time and temperature; reduces parameter drift in harsh thermal cycling environments. |
| Fast response time <1.0 ps | Clamps transients before sensitive downstream ICs experience overvoltage stress - critical for CAN, LIN, and sensor interfaces. |
| ISO 7637-2 compliant | Withstands standardized automotive transients (Pulse 1, 2a, 2b, 3a, 3b) without degradation - eliminates need for external filtering stages. |
| Moisture sensitivity level 1 | Zero bake requirement prior to reflow; simplifies manufacturing flow and reduces risk of popcorning during assembly. |
Applications
| Automotive Power Rail Protection | On-Board DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp transients above 13V. Use Value: Limits peak voltage to 21.5V during 400W pulses, preventing damage to LDOs, microcontrollers, and CAN transceivers. |
Use Scenario: Safeguarding primary-side input of isolated 12V-to-5V/3.3V DC/DC converters in infotainment and ADAS modules. IC Role / Device Role / Timing Role: Standoff protector on converter VIN pin, activated only during >14.4V overvoltage events. Use Value: Maintains <1μA leakage at 13V, avoiding efficiency loss; clamps within 1ps to preserve regulation loop stability. |
| Industrial SMPS Secondary Side | LED Driver Supply Line |
Use Scenario: Securing secondary-side 24V output rails in DIN-rail mounted switch-mode power supplies exposed to inductive kickback. IC Role / Device Role / Timing Role: TVS connected across output terminals to absorb flyback energy from relay coils or solenoids. Use Value: 400W pulse rating handles repetitive 10/1000μs surges; DO-214AC footprint allows compact layout near connector entry points. |
Use Scenario: Suppressing switching noise and line transients on constant-current LED driver inputs in streetlight and signage systems. IC Role / Device Role / Timing Role: Unidirectional clamping device on AC-DC rectified input, referenced to local ground plane. Use Value: 21.5V clamping prevents overvoltage failure of MOSFET gate drivers and current-sense amplifiers upstream of the LED string. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ13A | Identical VWM (13V), VBR (14.4–15.9V), VC (21.5V), and PPPM (400W); same DO-214AC package and AEC-Q101 qualification. | No functional or layout difference; validated for identical ISO 7637-2 pulse profiles and thermal derating curves. | Select when dual-sourcing is required or Littelfuse supply chain alignment is preferred. |
| Vishay SMAJ13AHE3/5BT | Same VWM/VBR/VC specs and DO-214AC package; RoHS/halogen-free compliant; meets AEC-Q101 but specifies 100% surge-tested screening. | Offers enhanced traceability (E3/5BT suffix) and extended surge test validation - suitable for safety-critical subsystems requiring full lot traceability. | Choose for ASIL-B designs where component-level surge test documentation and batch traceability are mandated. |
Compared with SMAJ13AH, SMAJ13A offers identical electrical and mechanical behavior with no PCB changes required, while SMAJ13AHE3/5BT adds certified surge test records and full-lot traceability - making it preferable for ASIL-B automotive modules where verification rigor exceeds baseline AEC-Q101 requirements.
Availability
SMAJ13AH is available at Aetrix Electronics and suitable for automotive power rail protection, on-board DC/DC converter input hardening, and industrial SMPS secondary-side surge suppression requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ13AH 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 was developed specifically for automotive and industrial transient suppression, emphasizing AEC-Q101 reliability, ISO 7637-2 compliance, and high-power 10/1000μs clamping performance in standard surface-mount packages.
FAQ
What is the clamping voltage of SMAJ13AH and how is it measured?
The SMAJ13AH has a maximum clamping voltage (VC) of 21.5 V, measured at 18.6 A peak impulse current using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range and reflects the actual voltage seen by downstream components during a surge event - critical for ensuring protected ICs remain within absolute maximum ratings.
Is SMAJ13AH unidirectional or bidirectional, and how is polarity identified?
SMAJ13AH is a unidirectional TVS diode, intended for DC line protection where polarity is fixed. Polarity is marked by a cathode band on the DO-214AC package body - the banded end connects to the protected line (e.g., 12V rail), while the anode connects to ground. Bidirectional variants use CH or CAH suffixes (e.g., SMAJ13CH), which SMAJ13AH does not carry.
Does SMAJ13AH meet automotive qualification standards?
Yes, SMAJ13AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its construction - including glass-passivated junction, moisture sensitivity level 1, and JESD201 Class 2 whisker resistance - satisfies full automotive component reliability criteria for under-hood and cabin applications.
What is the maximum steady-state power dissipation for SMAJ13AH?
The SMAJ13AH has a steady-state power dissipation (PD) rating of 1 W at TA = 25°C. This value applies only to continuous DC or low-frequency reverse bias conditions - not transient events. For surge protection, the relevant rating is 400 W peak pulse power (10/1000 μs), which dominates design considerations for transient suppression applications.
How does SMAJ13AH compare to SMAJ13H in terms of breakdown voltage?
SMAJ13AH has a tighter VBR range of 14.4–15.9 V (min/max at 1 mA), whereas SMAJ13H specifies 14.4–17.6 V. The "A" suffix denotes improved VBR tolerance - reducing design margin uncertainty and enabling more precise clamping threshold selection in noise-sensitive or tightly regulated systems where consistent turn-on behavior is essential.
SMAJ13AH 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):
- 13V
- Voltage - Breakdown (Min):
- 14.4V
- Voltage - Clamping (Max) @ Ipp:
- 21.5V
- Current - Peak Pulse (10/1000µs):
- 18.6A
- 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)
SMAJ13AH FAQ
1.How can I place an order for SMAJ13AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ13AH 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 SMAJ13AH reliable?
The price and inventory of SMAJ13AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ13AH is usually 5 days.
3.What payment methods are accepted for SMAJ13AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ13AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ13AH?
SMAJ13AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ13AH 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 SMAJ13AH?
For technical support, including SMAJ13AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ13AH requirements.
6.How does Aetrix verify that SMAJ13AH is sourced from the original manufacturer or authorized distributors?
All SMAJ13AH 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 SMAJ13AH meets industry standards.
7.What is the process for return or replacement of SMAJ13AH?
All SMAJ13AH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ13AH, 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 SMAJ13AH part is unused and in its original packaging.
Return procedure for SMAJ13AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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