My Inquiry
My Account
Taiwan Semiconductor Corporation P4SMA91CAH
- Part No.:
- P4SMA91CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
P4SMA91CAH.pdf
- Description:
- TVS DIODE 77.8VWM 125VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,467
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
P4SMA91CAH from Taiwan Semiconductor is a bidirectional 400W surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with a working stand-off voltage of 77.8 V, breakdown voltage range 86.5–95.5 V at 1 mA, clamping voltage of 125 V at 3.3 A (10/1000 µs), and junction temperature rating up to +150 °C - deployed for surge protection in automotive DC/DC converters and industrial power supplies.
For engineers reviewing the P4SMA91CAH datasheet, P4SMA91CAH pinout, P4SMA91CAH application, or P4SMA91CAH equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, ISO 7637-2 pulse compliance, moisture sensitivity level (MSL 1), and real-world clamping performance under standardized surge waveforms.
Technical Context
The P4SMA91CAH is a bipolar TVS diode designed for symmetrical transient suppression in both directions, meeting ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1 µA at 77.8 V).
It features fast response time (<1.0 ps), 400 W peak pulse power rating (10/1000 µs), and operates across –55 °C to +150 °C. The device uses a single-die configuration in DO-214AC package with matte tin-plated leads compliant with J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 77.8 V - maximum continuous reverse operating voltage before significant leakage begins |
| VBR min/max | 86.5 V / 95.5 V at IT = 1 mA - guaranteed breakdown voltage window defining turn-on threshold |
| VC | 125 V at IPPM = 3.3 A (10/1000 µs) - clamped voltage limiting downstream circuit stress during surge events |
| PPPM | 400 W - peak pulse power handling capability per single 10/1000 µs waveform |
| IR @ VWM | <1 µA - ultra-low reverse leakage ensuring minimal standby power loss and signal integrity |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive and high-ambient industrial environments |
| Package | DO-214AC (SMA) - industry-standard surface-mount outline with MSL 1 moisture rating and JESD201 Class 2 whisker resistance |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with cathode band marking; polarity indicated by band on one end; terminals are matte tin-plated leads suitable for reflow and wave soldering per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry point in forward bias; common terminal in bidirectional conduction | Connected to protected line side; forms symmetrical clamping path with cathode during either polarity surge |
| Cathode (banded end) | Current exit point in forward bias; common terminal in bidirectional conduction | Connected to ground or reference rail; enables low-impedance shunt path for transients in both directions |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Glass passivated junction | Ensures stable VBR tolerance and long-term leakage stability under thermal and humidity stress |
| ISO 7637-2 compliance | Withstands defined automotive load dump and supply interruption pulses without degradation or failure |
| MSL 1 rating | Zero floor life limitation - can be stored indefinitely at ≤30 °C/60% RH without baking prior to assembly |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained applications |
Applications
| Automotive DC/DC Converters | Industrial SMPS Inputs |
|---|---|
Use Scenario: Protecting 12 V/24 V input rails of buck-derived DC/DC modules against load dump and alternator-induced surges. IC Role / Device Role / Timing Role: Bidirectional shunt clamp absorbing energy from ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 2b (battery disconnection). Use Value: Limits voltage excursion to ≤125 V during 3.3 A surge, preventing MOSFET gate oxide rupture and controller IC latch-up. | Use Scenario: Safeguarding primary-side rectifier outputs in offline AC/DC adapters exposed to lightning-induced line surges. IC Role / Device Role / Timing Role: Fast-acting voltage clamp placed across bulk capacitor input to divert 10/1000 µs transients before they reach switching stage. Use Value: Delivers 400 W peak power dissipation with <1 ps response, maintaining system uptime in EN 61000-4-5 Level 3 environments. |
| LED Driver Power Stages | On-Board Charger (OBC) Auxiliary Supplies |
Use Scenario: Suppressing switching noise and inductive kickback in constant-current LED driver front-ends using boost topology. IC Role / Device Role / Timing Role: Parallel-connected TVS across high-side switch drain-source to clamp flyback spikes during PWM turn-off. Use Value: Clamps to 125 V within picoseconds, reducing EMI generation and preventing gate-driver overvoltage in 48 V automotive lighting systems. | Use Scenario: Protecting low-voltage auxiliary supplies (e.g., 5 V/12 V rails) in EV on-board chargers from coupled transients from high-power AC/DC stages. IC Role / Device Role / Timing Role: Secondary-side transient suppressor referenced to isolated ground, guarding LDO inputs and MCU power pins. Use Value: Maintains <1 µA leakage at 77.8 V, eliminating standby current penalty while providing robust 125 V clamping during fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ90CA | 600 W rating, SMB package (larger footprint), VC = 129 V @ 4.7 A | Higher power margin but requires PCB area increase; less suitable for space-constrained automotive modules | Select when higher surge margin is needed and board space allows SMB footprint |
| 1.5SMC91CA | 1500 W rating, SMC package (3.94 mm × 2.79 mm), VC = 125 V @ 12 A | Designed for heavy-duty industrial mains input protection; over-specified for low-energy DC bus clamping | Choose only if system-level surge testing exceeds IEC 61000-4-5 Level 4 or requires >1 kA capability |
Compared with SMBJ90CA and 1.5SMC91CA, the P4SMA91CAH offers optimal balance of 400 W surge capacity, DO-214AC compactness, AEC-Q101 qualification, and sub-1 µA leakage - making it preferred for cost-sensitive, space-limited automotive and industrial DC power nodes where ISO 7637-2 compliance is mandatory.
Availability
P4SMA91CAH is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial SMPS inputs, and LED driver power stages requiring stable component supply, full traceability, and AEC-Q101-compliant surge protection.
Supply support for P4SMA91CAH 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 P4SMA91CAH belongs to TSC's AEC-Q101-qualified P4SMAx(A)H series - engineered specifically for automotive and industrial transient suppression where reliability, low leakage, and standardized DO-214AC packaging are critical.
FAQ
What is the clamping voltage of the P4SMA91CAH under standard surge conditions?
The P4SMA91CAH has a maximum clamping voltage (VC) of 125 V when subjected to a 10/1000 µs surge waveform with peak current of 3.3 A. This value is measured per IEC 61000-4-5 and ANSI/IEEE C62.35 standards and defines the upper voltage limit imposed on protected circuits during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the P4SMA91CAH suitable for automotive applications?
Yes, the P4SMA91CAH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements - confirming its suitability for automotive power networks including 12 V and 24 V battery systems. Its DO-214AC package, MSL 1 rating, and –55 °C to +150 °C operating range further validate its use in engine control units, body electronics, and ADAS power domains.
How does the "CAH" suffix in P4SMA91CAH differ from "CH" or "H" variants?
The "CAH" suffix denotes a bidirectional configuration with tighter VBR tolerance: P4SMA91CAH specifies 86.5–95.5 V (±5% typical) versus P4SMA91CH's wider 81.9–100 V range. Both are bidirectional, but CAH provides improved consistency for precision clamping in safety-critical nodes where predictable turn-on voltage is essential - such as MCU reset line protection or CAN transceiver VCC rail stabilization.
What is the maximum reverse leakage current for the P4SMA91CAH at its working voltage?
The P4SMA91CAH exhibits a maximum reverse leakage current (IR) of 1 µA when biased at its working stand-off voltage (VWM) of 77.8 V. This ultra-low leakage minimizes quiescent power loss and avoids false triggering in high-impedance sensing circuits - a key advantage over generic TVS diodes that may exceed 5 µA at comparable VWM.
Does the P4SMA91CAH require derating at elevated ambient temperatures?
Yes, the P4SMA91CAH must be derated above 25 °C ambient per Figure 2 in its datasheet: peak pulse power decreases linearly to ~200 W at +100 °C and ~100 W at +125 °C. Designers must apply this derating when deploying the P4SMA91CAH in under-hood locations or enclosed industrial enclosures to ensure reliable 400 W surge handling remains within safe thermal limits.
P4SMA91CAH 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 77.8V
- Voltage - Breakdown (Min):
- 86.5V
- Voltage - Clamping (Max) @ Ipp:
- 125V
- Current - Peak Pulse (10/1000µs):
- 3.3A
- 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)
P4SMA91CAH FAQ
1.How can I place an order for P4SMA91CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for P4SMA91CAH 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 P4SMA91CAH reliable?
The price and inventory of P4SMA91CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P4SMA91CAH is usually 5 days.
3.What payment methods are accepted for P4SMA91CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P4SMA91CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P4SMA91CAH?
P4SMA91CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P4SMA91CAH 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 P4SMA91CAH?
For technical support, including P4SMA91CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P4SMA91CAH requirements.
6.How does Aetrix verify that P4SMA91CAH is sourced from the original manufacturer or authorized distributors?
All P4SMA91CAH 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 P4SMA91CAH meets industry standards.
7.What is the process for return or replacement of P4SMA91CAH?
All P4SMA91CAH units undergo pre-shipment inspection (PSI). If there is an issue with P4SMA91CAH, 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 P4SMA91CAH part is unused and in its original packaging.
Return procedure for P4SMA91CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
P4SMA91CAH Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
