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Taiwan Semiconductor Corporation P4SMA120AH
- Part No.:
- P4SMA120AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA120AH.pdf
- Description:
- TVS DIODE 102VWM 165VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,031
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Product details
Overview
P4SMA120AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, rated for 400W peak pulse power, 114–126V breakdown voltage (VBR), and 165V maximum clamping voltage (VC) at 2.5A peak impulse current. It protects DC/DC converters and automotive power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the P4SMA120AH datasheet, P4SMA120AH pinout, P4SMA120AH application, or P4SMA120AH equivalent, key selection criteria include its AEC-Q101 qualification, 102V working stand-off voltage (VWM), <1μA reverse leakage at VWM, glass-passivated junction, and UL 94V-0 molding compound - all critical for automotive-grade board-level surge protection.
Technical Context
The P4SMA120AH operates as a unidirectional avalanche diode with a single-die configuration optimized for fast transient suppression in 12V–48V automotive and industrial power systems. Its clamping behavior is defined by a 10/1000μs waveform, delivering 165V clamping at 2.5A while maintaining ≤1μA leakage above 102V.
Designed for surface-mount assembly on PCBs with tight thermal constraints, it features a moisture sensitivity level (MSL) 1 rating per J-STD-020 and meets JESD 201 Class 2 whisker resistance. Its operating junction temperature spans –55°C to +150°C, supporting under-hood automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=1mA | 114–126V: Ensures reliable avalanche conduction onset within 10% tolerance at test current |
| VWM | 102V: Maximum continuous reverse voltage before significant leakage; sets system operating margin |
| VC @ IPPM=2.5A | 165V: Clamped voltage during 10/1000μs surge; defines protected circuit's max transient exposure |
| PPPM | 400W: Peak pulse power handling per single non-repetitive event per Fig.5 waveform |
| IR @ VWM | <1μA: Ultra-low leakage preserves standby power integrity in always-on systems |
| TJ max | +150°C: Enables placement near heat sources (e.g., MOSFETs, inductors) without derating |
| Package | DO-214AC (SMA): Standardized SMT footprint compatible with automated pick-and-place and reflow |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, cathode band marking polarity, 0.060g weight, and UL 94V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / low-side reference | Connected to ground or low-voltage rail; forms return path during clamping |
| Cathode | Reverse-biased terminal / high-side connection | Connected to protected line (e.g., 12V supply); blocks normal operation, avalanches during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements (HTOL, TC, UHAST, etc.) |
| Glass passivated junction | Enhances long-term reliability and stability of VBR under thermal cycling and humidity |
| Fast response time <1.0ps | Clamps ESD and fast transients before downstream ICs experience overstress |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Complies with automotive load dump and inductive switching immunity standards |
| Halogen-free & RoHS compliant | Fulfills environmental compliance for EU and global automotive supply chains |
Applications
| Automotive Body Control Module (BCM) | Industrial DC/DC Converter Input Stage |
|---|---|
Use Scenario: Protects 12V supply rail in BCM against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery input and primary DC/DC regulator input. Use Value: Limits transient voltage to ≤165V, preventing damage to upstream PMICs and microcontrollers rated for 36V absolute max. | Use Scenario: Shields isolated 24V-to-5V buck converter input from switching noise and back-EMF surges. IC Role / Device Role / Timing Role: Standoff protector on primary-side input capacitor node. Use Value: Withstands 400W pulses without degradation, enabling robust operation in factory automation power supplies. |
| On-Board Charger (OBC) Auxiliary Power Supply | LED Driver Power Input Protection |
Use Scenario: Safeguards 12V auxiliary supply in EV OBC against CAN bus coupling and relay bounce. IC Role / Device Role / Timing Role: TVS connected across input terminals of isolated flyback controller. Use Value: 102V VWM ensures no conduction during nominal 13.5V operation; 165V clamping prevents latch-up in PWM controllers. | Use Scenario: Guards constant-current LED driver input against hot-swap surges and cable discharge events. IC Role / Device Role / Timing Role: Primary-line transient suppressor upstream of input EMI filter. Use Value: <1μA leakage avoids false triggering in low-power standby modes; MSL 1 supports high-volume reflow manufacturing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120A | Same 120V nominal rating but SMB package (DO-214AA); 600W PPPM; higher VC = 193V | Higher power handling but larger footprint; less suitable for space-constrained automotive modules | Select when higher surge margin is needed and PCB area allows SMB size |
| 1.5SMC120A | Same 120V rating, larger SMC (DO-214AB) package; 1500W PPPM; VC = 193V | Designed for industrial mains-level protection; over-spec'd for low-voltage automotive use | Choose only if legacy design uses SMC footprint and higher energy absorption is required |
Compared with SMBJ120A and 1.5SMC120A, the P4SMA120AH offers optimal balance of compact DO-214AC size, AEC-Q101 qualification, and precise 165V clamping - making it preferred for new automotive electronics where board space and qualification rigor are prioritized over raw power rating.
Availability
P4SMA120AH is available at Aetrix Electronics and suitable for automotive body control modules, industrial DC/DC converters, and on-board charger auxiliary supplies requiring stable component supply and full AEC-Q101 traceability.
Supply support for P4SMA120AH 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 P4SMA120AH belongs to TSC's AEC-Q101-qualified P4SMAx(A)H series of surface-mount TVS diodes, engineered specifically for robust transient protection in automotive power distribution and industrial power conversion systems.
FAQ
What is the clamping voltage of the P4SMA120AH under standard surge conditions?
The P4SMA120AH has a maximum clamping voltage (VC) of 165V at 2.5A peak impulse current using the 10/1000μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuits during standardized transient events - critical for ensuring downstream ICs remain within their absolute maximum ratings.
Is the P4SMA120AH suitable for bidirectional transient protection?
No, the P4SMA120AH is a unidirectional TVS diode intended for DC line protection with defined anode-cathode polarity. For bidirectional applications (e.g., AC lines or data buses), TSC specifies variants with "CH" or "CAH" suffixes - the P4SMA120AH itself must be oriented with cathode toward the protected line and anode to ground.
Does the P4SMA120AH meet automotive qualification standards?
Yes, the P4SMA120AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its MSL 1 rating, JESD 201 Class 2 whisker resistance, and –55°C to +150°C operating range further validate its suitability for under-hood and chassis-mounted automotive electronics.
What is the reverse leakage current specification for the P4SMA120AH at its working voltage?
The P4SMA120AH exhibits a maximum reverse leakage current (IR) of 1μA when biased at its working stand-off voltage (VWM) of 102V. This ultra-low leakage ensures minimal power loss in always-on automotive subsystems and avoids false triggering in high-impedance sensing circuits.
How does the P4SMA120AH differ from the P4SMA120H variant?
The P4SMA120AH has tighter breakdown voltage tolerance (114–126V vs. 108–132V for P4SMA120H), resulting in more consistent clamping performance across production lots. Both share identical package, power rating, and qualification status, but the "A" suffix denotes enhanced VBR binning - important for designs requiring predictable turn-on thresholds.
P4SMA120AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- P4SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 102V
- Voltage - Breakdown (Min):
- 114V
- Voltage - Clamping (Max) @ Ipp:
- 165V
- Current - Peak Pulse (10/1000µs):
- 2.5A
- 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)
P4SMA120AH FAQ
1.How can I place an order for P4SMA120AH through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA120AH 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 P4SMA120AH reliable?
The price and inventory of P4SMA120AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA120AH is usually 5 days.
3.What payment methods are accepted for P4SMA120AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA120AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA120AH?
P4SMA120AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA120AH 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 P4SMA120AH?
For technical support, including P4SMA120AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA120AH requirements.
6.How does Aetrix verify that P4SMA120AH is sourced from the original manufacturer or authorized distributors?
All P4SMA120AH 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 P4SMA120AH meets industry standards.
7.What is the process for return or replacement of P4SMA120AH?
All P4SMA120AH units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA120AH, 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 P4SMA120AH part is unused and in its original packaging.
Return procedure for P4SMA120AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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