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STMicroelectronics PB137ACV
- Part No.:
- PB137ACV
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3
- Datasheet:
-
PB137ACV.pdf
- Description:
- IC REG LINEAR 13.7V 1A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:15,667
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Product details
Overview
PB137ACV from STMicroelectronics is a three-terminal fixed positive voltage regulator delivering 13.7 V at ≥1.5 A output current, designed specifically for lead-acid battery charging. It features reverse leakage current <10 µA (TJ = 0–40 °C), ±1 % output voltage tolerance at 25 °C, and 2.6 V typical dropout voltage at 1 A and 25 °C.
For engineers reviewing the PB137ACV datasheet, PB137ACV pinout, PB137ACV application, or PB137ACV equivalent, key selection criteria include reverse leakage performance in battery-disconnect scenarios, thermal shutdown behavior under sustained load, dropout voltage margin at elevated temperature, and TO-220 package thermal resistance (RthJC = 5 °C/W).
Technical Context
The PB137ACV integrates internal current limiting, thermal shutdown, and safe-area protection to prevent damage during overload or fault conditions. Its regulation architecture maintains stable 13.7 V output across input voltages from 16 V to 28.7 V and load currents from 5 mA to 1.5 A, with line regulation ≤150 mV and load regulation ≤100 mV at 25 °C.
Designed for high-reliability battery-charging circuits, it operates over 0–150 °C junction temperature range and exhibits low output noise (300 µVrms, 10 Hz–10 kHz) and 58 dB supply voltage rejection at 120 Hz - critical for minimizing ripple-induced charge termination errors in sealed lead-acid systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | 13.7 V ±1 % at 25 °C - ensures precise float charge voltage compliance for 12 V lead-acid batteries. |
| Max output current | ≥1.5 A - supports fast charging of 7–20 Ah SLA batteries without external pass devices. |
| Dropout voltage | 2.6 V max at 1 A, 25 °C - enables operation from unregulated 15–16 V DC supplies common in automotive alternator-based chargers. |
| Reverse leakage | ≤10 µA at VO = 13.7 V, VI floating, TJ = 0–40 °C - prevents battery self-discharge when input is disconnected. |
| Thermal resistance | RthJC = 5 °C/W - allows ≥1 A continuous output with minimal heatsink when mounted on ≥25 cm² copper area. |
| Quiescent current | 4–8 mA - minimizes standby power loss in always-connected charger applications. |
| SVR @ 120 Hz | 58 dB - suppresses alternator ripple to maintain stable battery voltage during engine-run charging. |
Pinout & Package
Supplied in TO-220 package with exposed metal tab (pin 2) electrically connected to the output terminal. Requires insulating shoulder washer when mounting to grounded heatsinks.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Input) | Voltage input | Accepts unregulated DC input up to 40 V; must be decoupled with ≥1 µF ceramic near pin. |
| 2 (Output) | Regulated output | 13.7 V regulated source; tab is electrically tied to this pin - critical for thermal path and grounding strategy. |
| 3 (Ground) | Reference return | Low-impedance return path for regulation loop; separate ground trace recommended from input capacitor to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse leakage suppression | ≤10 µA with floating input - eliminates parasitic discharge path when charger is off or disconnected. |
| Thermal shutdown activation | Triggers at TJ ≥150 °C - protects device and battery during sustained overload or inadequate heatsinking. |
| Internal safe-area protection | Prevents second breakdown during transient overloads - enables robust operation without external foldback circuitry. |
| Line/load regulation stability | ≤150 mV line, ≤100 mV load variation - maintains battery voltage within ±1 % across operating conditions. |
Applications
| Automotive Battery Charger | UPS Backup Charging Circuit |
|---|---|
Use Scenario: On-vehicle maintenance charger powered from alternator or auxiliary DC source. IC Role / Device Role / Timing Role: Primary voltage regulation stage delivering precise 13.7 V float charge to 12 V SLA battery. Use Value: Reverse leakage <10 µA prevents overnight battery drain when engine is off and alternator disconnected. | Use Scenario: Standby charging module in line-interactive UPS maintaining sealed lead-acid backup battery. IC Role / Device Role / Timing Role: Constant-voltage charge controller ensuring battery remains at optimal float voltage during AC mains availability. Use Value: 58 dB SVR rejects 120 Hz rectified ripple, preventing false full-charge detection and premature switch to trickle mode. |
| Solar Charge Controller Auxiliary Stage | Industrial Telecom Power Supply |
Use Scenario: Secondary regulation stage in solar charge controller, refining bulk-charged battery voltage to final float level. IC Role / Device Role / Timing Role: Precision post-regulator after MPPT or PWM bulk stage, enforcing strict 13.7 V setpoint. Use Value: ±1 % output tolerance at 25 °C and <0.5 % long-term drift (1000 hrs @ 125 °C) ensures consistent battery health over years of field operation. | Use Scenario: Centralized 13.7 V battery backup supply for telecom shelf controllers and alarm monitoring units. IC Role / Device Role / Timing Role: Isolated backup regulator providing fail-safe battery voltage during AC failure events. Use Value: Thermal shutdown + safe-area protection sustains operation through short-duration overloads (e.g., relay coil inrush), avoiding system reset during brownout recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| L4931CD33TR | 3.3 V fixed output, 250 mA max, no reverse leakage spec provided | Not suitable for 13.7 V battery charging; limited to low-power logic rails | Select only if target voltage and current match L4931's 3.3 V/250 mA rating. |
| LM317T | Adjustable output (1.25–37 V), 1.5 A, reverse leakage not specified; requires two external resistors | Requires precision resistor network for 13.7 V setting; lacks guaranteed reverse leakage performance | Choose only when adjustable output or tighter line regulation (0.01 %/V) is prioritized over guaranteed low reverse leakage. |
Compared with PB137ACV, L4931CD33TR serves entirely different voltage/current classes and LM317T trades guaranteed 13.7 V accuracy and sub-10 µA reverse leakage for adjustability - making PB137ACV uniquely suited for maintenance-critical SLA charging where leakage-induced discharge must be eliminated.
Availability
PB137ACV is available at Aetrix Electronics and suitable for automotive battery chargers, UPS backup systems, solar charge controllers, and industrial telecom power supplies requiring stable component supply with guaranteed reverse leakage performance and thermal robustness.
Supply support for PB137ACV 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The PB137 belongs to ST's legacy linear voltage regulator product line, engineered specifically for high-reliability battery charging applications where reverse leakage, thermal resilience, and precise fixed output voltage are non-negotiable.
FAQ
What is the maximum input voltage the PB137ACV can withstand?
The absolute maximum DC input voltage is 40 V, per STMicroelectronics' datasheet Table 2. Operation above 28.7 V degrades line regulation and increases dropout-related power dissipation; sustained use above 35 V risks exceeding safe operating area limits even with adequate heatsinking.
Does the PB137ACV require an output capacitor, and what value is recommended?
Yes - a minimum 10 µF aluminum or tantalum capacitor is required at the output for stability, as specified in the test conditions of Table 4. Ceramic capacitors ≥10 µF may be used but require series ESR ≥100 mΩ or a small series resistor to ensure phase margin; omission causes oscillation and regulation failure.
How does the PB137ACV behave when the input voltage drops below the dropout threshold?
When VI falls below VO + Vd (e.g., <16.3 V for 13.7 V output), the device enters dropout mode: output voltage tracks input minus ~2.6 V, with degraded regulation and increased output impedance. Load current capability decreases proportionally, and thermal stress rises due to higher conduction losses in the pass element.
Can the PB137ACV be paralleled for higher current output?
No - the PB137ACV lacks built-in current-sharing circuitry or matching tolerance guarantees. Paralleling causes unequal current distribution due to output voltage mismatch (±1 %), leading to thermal runaway in the unit with lowest VO. For >1.5 A, use a single higher-current regulator or switch-mode pre-regulator followed by PB137ACV for ripple filtering.
PB137ACV Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 13.7V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2.6V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 8 mA
- Current - Supply (Max):
- -
- PSRR:
- 58dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature
- Operating Temperature:
- 0°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
PB137ACV FAQ
1.How can I place an order for PB137ACV through Aetrix?
Please submit a Request for Quotation (RFQ) for PB137ACV 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 PB137ACV reliable?
The price and inventory of PB137ACV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PB137ACV is usually 5 days.
3.What payment methods are accepted for PB137ACV?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PB137ACV transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PB137ACV?
PB137ACV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PB137ACV 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 PB137ACV?
For technical support, including PB137ACV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PB137ACV requirements.
6.How does Aetrix verify that PB137ACV is sourced from the original manufacturer or authorized distributors?
All PB137ACV 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 PB137ACV meets industry standards.
7.What is the process for return or replacement of PB137ACV?
All PB137ACV units undergo pre-shipment inspection (PSI). If there is an issue with PB137ACV, 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 PB137ACV part is unused and in its original packaging.
Return procedure for PB137ACV:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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